diff options
Diffstat (limited to 'src/regex')
| -rw-r--r-- | src/regex/fnmatch.c | 150 | ||||
| -rw-r--r-- | src/regex/glob.c | 238 | ||||
| -rw-r--r-- | src/regex/regcomp.c | 3362 | ||||
| -rw-r--r-- | src/regex/regerror.c | 75 | ||||
| -rw-r--r-- | src/regex/regexec.c | 1107 | ||||
| -rw-r--r-- | src/regex/tre-mem.c | 163 | ||||
| -rw-r--r-- | src/regex/tre.h | 269 |
7 files changed, 5364 insertions, 0 deletions
diff --git a/src/regex/fnmatch.c b/src/regex/fnmatch.c new file mode 100644 index 00000000..5f2fccdb --- /dev/null +++ b/src/regex/fnmatch.c @@ -0,0 +1,150 @@ +#include <fnmatch.h> +#include <wctype.h> +#include <string.h> +#include <wchar.h> +#include <stdlib.h> +#include <limits.h> + +static int next(const char **s) +{ + wchar_t c; + int l = mbtowc(&c, *s, MB_LEN_MAX); + /* hack to allow literal matches of invalid byte sequences */ + if (l < 0) return (unsigned char)*(*s)++ - 0x100; + *s += l; + return c; +} + +#define BRACKET_ERROR -0x100 +#define BRACKET_NOCHAR -0x101 + +static int bracket_next(const char **s) +{ + int c; + int type; + if (**s == '[') { + type = *(*s+1); + if (type == '.' || type == '=') { + *s += 2; + c = next(s); + if (c <= 0) return BRACKET_ERROR; + if (**s == type && *(*s+1) == ']') { + *s += 2; + return c; + } + for (; **s && (**s != type || *(*s+1) != ']'); (*s)++); + if (!**s) return BRACKET_ERROR; + *s += 2; + return BRACKET_NOCHAR; + } + } + c = next(s); + if (c <= 0) return BRACKET_ERROR; + return c; +} + +#define __FNM_CONT 0x8000 + +int fnmatch(const char *p, const char *s, int flags) +{ + int c, d, k; + int not; + int match; + int first; + int no_slash = (flags & FNM_PATHNAME) ? '/' : 0; + int no_period = (flags & FNM_PERIOD) && !(flags & __FNM_CONT) ? '.' : 0x100; + + flags |= __FNM_CONT; + + while ((c = *p++)) { + switch (c) { + case '?': + k = next(&s); + if (!k || k == no_period || k == no_slash) + return FNM_NOMATCH; + break; + case '\\': + if (!(flags & FNM_NOESCAPE)) { + c = *p++; + goto literal; + } + if (*s++ != c) return FNM_NOMATCH; + break; + case '*': + for (; *p == '*'; p++); + if (*p && !*s) return FNM_NOMATCH; + if (*s == no_period) + return FNM_NOMATCH; + if (!*p && (!no_slash || !strchr(s, no_slash))) + return 0; + for (; *s; s++) + if (!fnmatch(p, s, flags)) + return 0; + else if (*s == no_slash) + break; + return FNM_NOMATCH; + case '[': + not = (*p == '!' || *p == '^'); + if (not) p++; + k = next(&s); + if (!k || k == no_slash || k == no_period) + return FNM_NOMATCH; + match = 0; + first = 1; + for (;;) { + if (!*p) return FNM_NOMATCH; + if (*p == ']' && !first) break; + first = 0; + if (*p == '[' && *(p+1) == ':') { + const char *z; + p += 2; + for (z=p; *z && (*z != ':' || *(z+1) != ']'); z++); + if (!*z || z-p > 32) { /* FIXME: symbolic const? */ + return FNM_NOMATCH; + } else { + char class[z-p+1]; + memcpy(class, p, z-p); + class[z-p] = 0; + if (iswctype(k, wctype(class))) + match = 1; + } + p = z+2; + continue; + } + c = bracket_next(&p); + if (c == BRACKET_ERROR) + return FNM_NOMATCH; + if (c == BRACKET_NOCHAR) + continue; + if (*p == '-' && *(p+1) != ']') { + p++; + d = bracket_next(&p); + if (d == BRACKET_ERROR) + return FNM_NOMATCH; + if (d == BRACKET_NOCHAR) + continue; + if (k >= c && k <= d) + match = 1; + continue; + } + if (k == c) match = 1; + } + p++; + if (not == match) + return FNM_NOMATCH; + break; + default: + literal: + if (*s++ != c) + return FNM_NOMATCH; + if (c == no_slash && (flags & FNM_PERIOD)) { + no_period = '.'; + continue; + } + break; + } + no_period = 0x100; + } + if (*s) return FNM_NOMATCH; + return 0; +} diff --git a/src/regex/glob.c b/src/regex/glob.c new file mode 100644 index 00000000..9a70f0bc --- /dev/null +++ b/src/regex/glob.c @@ -0,0 +1,238 @@ +#include <glob.h> +#include <fnmatch.h> +#include <sys/stat.h> +#include <dirent.h> +#include <limits.h> +#include <string.h> +#include <stdlib.h> +#include <errno.h> +#include <stddef.h> +#include <unistd.h> +#include <stdio.h> +#include "libc.h" + +struct match +{ + struct match *next; + char name[1]; +}; + +static int is_literal(const char *p, int useesc) +{ + int bracket = 0; + for (; *p; p++) { + switch (*p) { + case '\\': + if (!useesc) break; + case '?': + case '*': + return 0; + case '[': + bracket = 1; + break; + case ']': + if (bracket) return 0; + break; + } + } + return 1; +} + +static int append(struct match **tail, const char *name, size_t len, int mark) +{ + struct match *new = malloc(sizeof(struct match) + len + 1); + if (!new) return -1; + (*tail)->next = new; + new->next = NULL; + strcpy(new->name, name); + if (mark) strcat(new->name, "/"); + *tail = new; + return 0; +} + +static int match_in_dir(const char *d, const char *p, int flags, int (*errfunc)(const char *path, int err), struct match **tail) +{ + DIR *dir; + long long de_buf[(sizeof(struct dirent) + NAME_MAX + sizeof(long long))/sizeof(long long)]; + struct dirent *de; + char pat[strlen(p)+1]; + char *p2; + size_t l = strlen(d); + int literal; + int fnm_flags= ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0) | FNM_PERIOD; + int error; + + if ((p2 = strchr(p, '/'))) { + strcpy(pat, p); + pat[p2-p] = 0; + for (; *p2 == '/'; p2++); + p = pat; + } + literal = is_literal(p, !(flags & GLOB_NOESCAPE)); + if (*d == '/' && !*(d+1)) l = 0; + + /* rely on opendir failing for nondirectory objects */ + dir = opendir(*d ? d : "."); + error = errno; + if (!dir) { + /* this is not an error -- we let opendir call stat for us */ + if (error == ENOTDIR) return 0; + if (error == EACCES && !*p) { + struct stat st; + if (!stat(d, &st) && S_ISDIR(st.st_mode)) { + if (append(tail, d, l, l)) + return GLOB_NOSPACE; + return 0; + } + } + if (errfunc(d, error) || (flags & GLOB_ERR)) + return GLOB_ABORTED; + return 0; + } + if (!*p) { + error = append(tail, d, l, l) ? GLOB_NOSPACE : 0; + closedir(dir); + return error; + } + while (!(error = readdir_r(dir, (void *)de_buf, &de)) && de) { + char namebuf[l+de->d_reclen+2], *name = namebuf; + if (!literal && fnmatch(p, de->d_name, fnm_flags)) + continue; + if (literal && strcmp(p, de->d_name)) + continue; + if (p2 && de->d_type && !S_ISDIR(de->d_type<<12) && !S_ISLNK(de->d_type<<12)) + continue; + if (*d) { + memcpy(name, d, l); + name[l] = '/'; + strcpy(name+l+1, de->d_name); + } else { + name = de->d_name; + } + if (p2) { + if ((error = match_in_dir(name, p2, flags, errfunc, tail))) { + closedir(dir); + return error; + } + } else { + int mark = 0; + if (flags & GLOB_MARK) { + if (de->d_type) + mark = S_ISDIR(de->d_type<<12); + else { + struct stat st; + stat(name, &st); + mark = S_ISDIR(st.st_mode); + } + } + if (append(tail, name, l+de->d_reclen+1, mark)) { + closedir(dir); + return GLOB_NOSPACE; + } + } + } + closedir(dir); + if (error && (errfunc(d, error) || (flags & GLOB_ERR))) + return GLOB_ABORTED; + return 0; +} + +static int ignore_err(const char *path, int err) +{ + return 0; +} + +static void freelist(struct match *head) +{ + struct match *match, *next; + for (match=head->next; match; match=next) { + next = match->next; + free(match); + } +} + +static int sort(const void *a, const void *b) +{ + return strcmp(*(const char **)a, *(const char **)b); +} + +int glob(const char *pat, int flags, int (*errfunc)(const char *path, int err), glob_t *g) +{ + const char *p=pat, *d; + struct match head = { .next = NULL }, *tail = &head; + size_t cnt, i; + size_t offs = (flags & GLOB_DOOFFS) ? g->gl_offs : 0; + int error = 0; + + if (*p == '/') { + for (; *p == '/'; p++); + d = "/"; + } else { + d = ""; + } + + if (!errfunc) errfunc = ignore_err; + + if (!(flags & GLOB_APPEND)) { + g->gl_offs = offs; + g->gl_pathc = 0; + g->gl_pathv = NULL; + } + + if (*p) error = match_in_dir(d, p, flags, errfunc, &tail); + if (error == GLOB_NOSPACE) { + freelist(&head); + return error; + } + + for (cnt=0, tail=head.next; tail; tail=tail->next, cnt++); + if (!cnt) { + if (flags & GLOB_NOCHECK) { + tail = &head; + if (append(&tail, pat, strlen(pat), 0)) + return GLOB_NOSPACE; + cnt++; + } else + return GLOB_NOMATCH; + } + + if (flags & GLOB_APPEND) { + char **pathv = realloc(g->gl_pathv, (offs + g->gl_pathc + cnt + 1) * sizeof(char *)); + if (!pathv) { + freelist(&head); + return GLOB_NOSPACE; + } + g->gl_pathv = pathv; + offs += g->gl_pathc; + } else { + g->gl_pathv = malloc((offs + cnt + 1) * sizeof(char *)); + if (!g->gl_pathv) { + freelist(&head); + return GLOB_NOSPACE; + } + for (i=0; i<offs; i++) + g->gl_pathv[i] = NULL; + } + for (i=0, tail=head.next; i<cnt; tail=tail->next, i++) + g->gl_pathv[offs + i] = tail->name; + g->gl_pathv[offs + i] = NULL; + g->gl_pathc += cnt; + + if (!(flags & GLOB_NOSORT)) + qsort(g->gl_pathv+offs, cnt, sizeof(char *), sort); + + return error; +} + +void globfree(glob_t *g) +{ + size_t i; + for (i=0; i<g->gl_pathc; i++) + free(g->gl_pathv[g->gl_offs + i] - offsetof(struct match, name)); + free(g->gl_pathv); + g->gl_pathc = 0; + g->gl_pathv = NULL; +} + +LFS64(glob); +LFS64(globfree); diff --git a/src/regex/regcomp.c b/src/regex/regcomp.c new file mode 100644 index 00000000..3307942e --- /dev/null +++ b/src/regex/regcomp.c @@ -0,0 +1,3362 @@ +/* + regcomp.c - TRE POSIX compatible regex compilation functions. + + Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi> + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + +*/ + +#include <string.h> +#include <errno.h> +#include <stdlib.h> +#include <regex.h> +#include <limits.h> +#include <stdint.h> + +#include "tre.h" + +#include <assert.h> + +/*********************************************************************** + from tre-ast.c and tre-ast.h +***********************************************************************/ + +/* The different AST node types. */ +typedef enum { + LITERAL, + CATENATION, + ITERATION, + UNION +} tre_ast_type_t; + +/* Special subtypes of TRE_LITERAL. */ +#define EMPTY -1 /* Empty leaf (denotes empty string). */ +#define ASSERTION -2 /* Assertion leaf. */ +#define TAG -3 /* Tag leaf. */ +#define BACKREF -4 /* Back reference leaf. */ + +#define IS_SPECIAL(x) ((x)->code_min < 0) +#define IS_EMPTY(x) ((x)->code_min == EMPTY) +#define IS_ASSERTION(x) ((x)->code_min == ASSERTION) +#define IS_TAG(x) ((x)->code_min == TAG) +#define IS_BACKREF(x) ((x)->code_min == BACKREF) + +/* Taken from tre-compile.h */ +typedef struct { + int position; + int code_min; + int code_max; + int *tags; + int assertions; + tre_ctype_t class; + tre_ctype_t *neg_classes; + int backref; +} tre_pos_and_tags_t; + +/* A generic AST node. All AST nodes consist of this node on the top + level with `obj' pointing to the actual content. */ +typedef struct { + tre_ast_type_t type; /* Type of the node. */ + void *obj; /* Pointer to actual node. */ + int nullable; + int submatch_id; + int num_submatches; + int num_tags; + tre_pos_and_tags_t *firstpos; + tre_pos_and_tags_t *lastpos; +} tre_ast_node_t; + + +/* A "literal" node. These are created for assertions, back references, + tags, matching parameter settings, and all expressions that match one + character. */ +typedef struct { + long code_min; + long code_max; + int position; + tre_ctype_t class; + tre_ctype_t *neg_classes; +} tre_literal_t; + +/* A "catenation" node. These are created when two regexps are concatenated. + If there are more than one subexpressions in sequence, the `left' part + holds all but the last, and `right' part holds the last subexpression + (catenation is left associative). */ +typedef struct { + tre_ast_node_t *left; + tre_ast_node_t *right; +} tre_catenation_t; + +/* An "iteration" node. These are created for the "*", "+", "?", and "{m,n}" + operators. */ +typedef struct { + /* Subexpression to match. */ + tre_ast_node_t *arg; + /* Minimum number of consecutive matches. */ + int min; + /* Maximum number of consecutive matches. */ + int max; +} tre_iteration_t; + +/* An "union" node. These are created for the "|" operator. */ +typedef struct { + tre_ast_node_t *left; + tre_ast_node_t *right; +} tre_union_t; + +static tre_ast_node_t * +tre_ast_new_node(tre_mem_t mem, tre_ast_type_t type, size_t size) +{ + tre_ast_node_t *node; + + node = tre_mem_calloc(mem, sizeof(*node)); + if (!node) + return NULL; + node->obj = tre_mem_calloc(mem, size); + if (!node->obj) + return NULL; + node->type = type; + node->nullable = -1; + node->submatch_id = -1; + + return node; +} + +static tre_ast_node_t * +tre_ast_new_literal(tre_mem_t mem, int code_min, int code_max, int position) +{ + tre_ast_node_t *node; + tre_literal_t *lit; + + node = tre_ast_new_node(mem, LITERAL, sizeof(tre_literal_t)); + if (!node) + return NULL; + lit = node->obj; + lit->code_min = code_min; + lit->code_max = code_max; + lit->position = position; + + return node; +} + +static tre_ast_node_t * +tre_ast_new_iter(tre_mem_t mem, tre_ast_node_t *arg, int min, int max) +{ + tre_ast_node_t *node; + tre_iteration_t *iter; + + node = tre_ast_new_node(mem, ITERATION, sizeof(tre_iteration_t)); + if (!node) + return NULL; + iter = node->obj; + iter->arg = arg; + iter->min = min; + iter->max = max; + node->num_submatches = arg->num_submatches; + + return node; +} + +static tre_ast_node_t * +tre_ast_new_union(tre_mem_t mem, tre_ast_node_t *left, tre_ast_node_t *right) +{ + tre_ast_node_t *node; + + node = tre_ast_new_node(mem, UNION, sizeof(tre_union_t)); + if (node == NULL) + return NULL; + ((tre_union_t *)node->obj)->left = left; + ((tre_union_t *)node->obj)->right = right; + node->num_submatches = left->num_submatches + right->num_submatches; + + return node; +} + +static tre_ast_node_t * +tre_ast_new_catenation(tre_mem_t mem, tre_ast_node_t *left, + tre_ast_node_t *right) +{ + tre_ast_node_t *node; + + node = tre_ast_new_node(mem, CATENATION, sizeof(tre_catenation_t)); + if (node == NULL) + return NULL; + ((tre_catenation_t *)node->obj)->left = left; + ((tre_catenation_t *)node->obj)->right = right; + node->num_submatches = left->num_submatches + right->num_submatches; + + return node; +} + +/*********************************************************************** + from tre-stack.c and tre-stack.h +***********************************************************************/ + +/* Just to save some typing. */ +#define STACK_PUSH(s, value) \ + do \ + { \ + status = tre_stack_push(s, (void *)(value)); \ + } \ + while (0) + +#define STACK_PUSHX(s, value) \ + { \ + status = tre_stack_push(s, (void *)(value)); \ + if (status != REG_OK) \ + break; \ + } + +#define STACK_PUSHR(s, value) \ + { \ + reg_errcode_t status; \ + status = tre_stack_push(s, (void *)(value)); \ + if (status != REG_OK) \ + return status; \ + } + +typedef struct tre_stack_rec { + int size; + int max_size; + int increment; + int ptr; + void **stack; +} tre_stack_t; + + +static tre_stack_t * +tre_stack_new(int size, int max_size, int increment) +{ + tre_stack_t *s; + + s = xmalloc(sizeof(*s)); + if (s != NULL) + { + s->stack = xmalloc(sizeof(*s->stack) * size); + if (s->stack == NULL) + { + xfree(s); + return NULL; + } + s->size = size; + s->max_size = max_size; + s->increment = increment; + s->ptr = 0; + } + return s; +} + +static void +tre_stack_destroy(tre_stack_t *s) +{ + xfree(s->stack); + xfree(s); +} + +static int +tre_stack_num_objects(tre_stack_t *s) +{ + return s->ptr; +} + +static reg_errcode_t +tre_stack_push(tre_stack_t *s, void *value) +{ + if (s->ptr < s->size) + { + s->stack[s->ptr] = value; + s->ptr++; + } + else + { + if (s->size >= s->max_size) + { + DPRINT(("tre_stack_push: stack full\n")); + return REG_ESPACE; + } + else + { + void **new_buffer; + int new_size; + DPRINT(("tre_stack_push: trying to realloc more space\n")); + new_size = s->size + s->increment; + if (new_size > s->max_size) + new_size = s->max_size; + new_buffer = xrealloc(s->stack, sizeof(*new_buffer) * new_size); + if (new_buffer == NULL) + { + DPRINT(("tre_stack_push: realloc failed.\n")); + return REG_ESPACE; + } + DPRINT(("tre_stack_push: realloc succeeded.\n")); + assert(new_size > s->size); + s->size = new_size; + s->stack = new_buffer; + tre_stack_push(s, value); + } + } + return REG_OK; +} + +static void * +tre_stack_pop(tre_stack_t *s) +{ + return s->stack[--s->ptr]; +} + + +/*********************************************************************** + from tre-parse.c and tre-parse.h +***********************************************************************/ + +/* Parse context. */ +typedef struct { + /* Memory allocator. The AST is allocated using this. */ + tre_mem_t mem; + /* Stack used for keeping track of regexp syntax. */ + tre_stack_t *stack; + /* The parse result. */ + tre_ast_node_t *result; + /* The regexp to parse and its length. */ + const tre_char_t *re; + /* The first character of the entire regexp. */ + const tre_char_t *re_start; + /* The first character after the end of the regexp. */ + const tre_char_t *re_end; + int len; + /* Current submatch ID. */ + int submatch_id; + /* Current position (number of literal). */ + int position; + /* The highest back reference or -1 if none seen so far. */ + int max_backref; + /* Compilation flags. */ + int cflags; + /* If this flag is set the top-level submatch is not captured. */ + int nofirstsub; +} tre_parse_ctx_t; + +static reg_errcode_t +tre_new_item(tre_mem_t mem, int min, int max, int *i, int *max_i, + tre_ast_node_t ***items) +{ + reg_errcode_t status; + tre_ast_node_t **array = *items; + /* Allocate more space if necessary. */ + if (*i >= *max_i) + { + tre_ast_node_t **new_items; + DPRINT(("out of array space, i = %d\n", *i)); + /* If the array is already 1024 items large, give up -- there's + probably an error in the regexp (e.g. not a '\0' terminated + string and missing ']') */ + if (*max_i > 1024) + return REG_ESPACE; + *max_i *= 2; + new_items = xrealloc(array, sizeof(*items) * *max_i); + if (new_items == NULL) + return REG_ESPACE; + *items = array = new_items; + } + array[*i] = tre_ast_new_literal(mem, min, max, -1); + status = array[*i] == NULL ? REG_ESPACE : REG_OK; + (*i)++; + return status; +} + + +/* Expands a character class to character ranges. */ +static reg_errcode_t +tre_expand_ctype(tre_mem_t mem, tre_ctype_t class, tre_ast_node_t ***items, + int *i, int *max_i, int cflags) +{ + reg_errcode_t status = REG_OK; + tre_cint_t c; + int j, min = -1, max = 0; + assert(TRE_MB_CUR_MAX == 1); + + DPRINT((" expanding class to character ranges\n")); + for (j = 0; (j < 256) && (status == REG_OK); j++) + { + c = j; + if (tre_isctype(c, class) + || ((cflags & REG_ICASE) + && (tre_isctype(tre_tolower(c), class) + || tre_isctype(tre_toupper(c), class)))) +{ + if (min < 0) + min = c; + max = c; + } + else if (min >= 0) + { + DPRINT((" range %c (%d) to %c (%d)\n", min, min, max, max)); + status = tre_new_item(mem, min, max, i, max_i, items); + min = -1; + } + } + if (min >= 0 && status == REG_OK) + status = tre_new_item(mem, min, max, i, max_i, items); + return status; +} + + +static int +tre_compare_items(const void *a, const void *b) +{ + tre_ast_node_t *node_a = *(tre_ast_node_t **)a; + tre_ast_node_t *node_b = *(tre_ast_node_t **)b; + tre_literal_t *l_a = node_a->obj, *l_b = node_b->obj; + int a_min = l_a->code_min, b_min = l_b->code_min; + + if (a_min < b_min) + return -1; + else if (a_min > b_min) + return 1; + else + return 0; +} + +/* Maximum number of character classes that can occur in a negated bracket + expression. */ +#define MAX_NEG_CLASSES 64 + +/* Maximum length of character class names. */ +#define MAX_CLASS_NAME + +static reg_errcode_t +tre_parse_bracket_items(tre_parse_ctx_t *ctx, int negate, + tre_ctype_t neg_classes[], int *num_neg_classes, + tre_ast_node_t ***items, int *num_items, + int *items_size) +{ + const tre_char_t *re = ctx->re; + reg_errcode_t status = REG_OK; + tre_ctype_t class = (tre_ctype_t)0; + int i = *num_items; + int max_i = *items_size; + int skip; + + /* Build an array of the items in the bracket expression. */ + while (status == REG_OK) + { + skip = 0; + if (re == ctx->re_end) + { + status = REG_EBRACK; + } + else if (*re == ']' && re > ctx->re) + { + DPRINT(("tre_parse_bracket: done: '%.*" STRF "'\n", + ctx->re_end - re, re)); + re++; + break; + } + else + { + tre_cint_t min = 0, max = 0; + + class = (tre_ctype_t)0; + if (re + 2 < ctx->re_end + && *(re + 1) == '-' && *(re + 2) != ']') + { + DPRINT(("tre_parse_bracket: range: '%.*" STRF "'\n", + ctx->re_end - re, re)); + min = *re; + max = *(re + 2); + re += 3; + /* XXX - Should use collation order instead of encoding values + in character ranges. */ + if (min > max) + status = REG_ERANGE; + } + else if (re + 1 < ctx->re_end + && *re == '[' && *(re + 1) == '.') + status = REG_ECOLLATE; + else if (re + 1 < ctx->re_end + && *re == '[' && *(re + 1) == '=') + status = REG_ECOLLATE; + else if (re + 1 < ctx->re_end + && *re == '[' && *(re + 1) == ':') + { + char tmp_str[64]; + const tre_char_t *endptr = re + 2; + int len; + DPRINT(("tre_parse_bracket: class: '%.*" STRF "'\n", + ctx->re_end - re, re)); + while (endptr < ctx->re_end && *endptr != ':') + endptr++; + if (endptr != ctx->re_end) + { + len = MIN(endptr - re - 2, 63); +#ifdef TRE_WCHAR + { + tre_char_t tmp_wcs[64]; + wcsncpy(tmp_wcs, re + 2, len); + tmp_wcs[len] = '\0'; +#if defined HAVE_WCSRTOMBS + { + mbstate_t state; + const tre_char_t *src = tmp_wcs; + memset(&state, '\0', sizeof(state)); + len = wcsrtombs(tmp_str, &src, sizeof(tmp_str), &state); + } +#elif defined HAVE_WCSTOMBS + len = wcstombs(tmp_str, tmp_wcs, 63); +#endif /* defined HAVE_WCSTOMBS */ + } +#else /* !TRE_WCHAR */ + strncpy(tmp_str, re + 2, len); +#endif /* !TRE_WCHAR */ + tmp_str[len] = '\0'; + DPRINT((" class name: %s\n", tmp_str)); + class = tre_ctype(tmp_str); + if (!class) + status = REG_ECTYPE; + /* Optimize character classes for 8 bit character sets. */ + if (status == REG_OK && TRE_MB_CUR_MAX == 1) + { + status = tre_expand_ctype(ctx->mem, class, items, + &i, &max_i, ctx->cflags); + class = (tre_ctype_t)0; + skip = 1; + } + re = endptr + 2; + } + else + status = REG_ECTYPE; + min = 0; + max = TRE_CHAR_MAX; + } + else + { + DPRINT(("tre_parse_bracket: char: '%.*" STRF "'\n", + ctx->re_end - re, re)); + if (*re == '-' && *(re + 1) != ']' + && ctx->re != re) + /* Two ranges are not allowed to share and endpoint. */ + status = REG_ERANGE; + min = max = *re++; + } + + if (status != REG_OK) + break; + + if (class && negate) + if (*num_neg_classes >= MAX_NEG_CLASSES) + status = REG_ESPACE; + else + neg_classes[(*num_neg_classes)++] = class; + else if (!skip) + { + status = tre_new_item(ctx->mem, min, max, &i, &max_i, items); + if (status != REG_OK) + break; + ((tre_literal_t*)((*items)[i-1])->obj)->class = class; + } + + /* Add opposite-case counterpoints if REG_ICASE is present. + This is broken if there are more than two "same" characters. */ + if (ctx->cflags & REG_ICASE && !class && status == REG_OK && !skip) + { + int cmin, ccurr; + + DPRINT(("adding opposite-case counterpoints\n")); + while (min <= max) + { + if (tre_islower(min)) + { + cmin = ccurr = tre_toupper(min++); + while (tre_islower(min) && tre_toupper(min) == ccurr + 1 + && min <= max) + ccurr = tre_toupper(min++); + status = tre_new_item(ctx->mem, cmin, ccurr, + &i, &max_i, items); + } + else if (tre_isupper(min)) + { + cmin = ccurr = tre_tolower(min++); + while (tre_isupper(min) && tre_tolower(min) == ccurr + 1 + && min <= max) + ccurr = tre_tolower(min++); + status = tre_new_item(ctx->mem, cmin, ccurr, + &i, &max_i, items); + } + else min++; + if (status != REG_OK) + break; + } + if (status != REG_OK) + break; + } + } + } + *num_items = i; + *items_size = max_i; + ctx->re = re; + return status; +} + +static reg_errcode_t +tre_parse_bracket(tre_parse_ctx_t *ctx, tre_ast_node_t **result) +{ + tre_ast_node_t *node = NULL; + int negate = 0; + reg_errcode_t status = REG_OK; + tre_ast_node_t **items, *u, *n; + int i = 0, j, max_i = 32, curr_max, curr_min; + tre_ctype_t neg_classes[MAX_NEG_CLASSES]; + int num_neg_classes = 0; + + /* Start off with an array of `max_i' elements. */ + items = xmalloc(sizeof(*items) * max_i); + if (items == NULL) + return REG_ESPACE; + + if (*ctx->re == '^') + { + DPRINT(("tre_parse_bracket: negate: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + negate = 1; + ctx->re++; + } + + status = tre_parse_bracket_items(ctx, negate, neg_classes, &num_neg_classes, + &items, &i, &max_i); + + if (status != REG_OK) + goto parse_bracket_done; + + /* Sort the array if we need to negate it. */ + if (negate) + qsort(items, i, sizeof(*items), tre_compare_items); + + curr_max = curr_min = 0; + /* Build a union of the items in the array, negated if necessary. */ + for (j = 0; j < i && status == REG_OK; j++) + { + int min, max; + tre_literal_t *l = items[j]->obj; + min = l->code_min; + max = l->code_max; + + DPRINT(("item: %d - %d, class %ld, curr_max = %d\n", + (int)l->code_min, (int)l->code_max, (long)l->class, curr_max)); + + if (negate) + { + if (min < curr_max) + { + /* Overlap. */ + curr_max = MAX(max + 1, curr_max); + DPRINT(("overlap, curr_max = %d\n", curr_max)); + l = NULL; + } + else + { + /* No overlap. */ + curr_max = min - 1; + if (curr_max >= curr_min) + { + DPRINT(("no overlap\n")); + l->code_min = curr_min; + l->code_max = curr_max; + } + else + { + DPRINT(("no overlap, zero room\n")); + l = NULL; + } + curr_min = curr_max = max + 1; + } + } + + if (l != NULL) + { + int k; + DPRINT(("creating %d - %d\n", (int)l->code_min, (int)l->code_max)); + l->position = ctx->position; + if (num_neg_classes > 0) + { + l->neg_classes = tre_mem_alloc(ctx->mem, + (sizeof(l->neg_classes) + * (num_neg_classes + 1))); + if (l->neg_classes == NULL) + { + status = REG_ESPACE; + break; + } + for (k = 0; k < num_neg_classes; k++) + l->neg_classes[k] = neg_classes[k]; + l->neg_classes[k] = (tre_ctype_t)0; + } + else + l->neg_classes = NULL; + if (node == NULL) + node = items[j]; + else + { + u = tre_ast_new_union(ctx->mem, node, items[j]); + if (u == NULL) + status = REG_ESPACE; + node = u; + } + } + } + + if (status != REG_OK) + goto parse_bracket_done; + + if (negate) + { + int k; + DPRINT(("final: creating %d - %d\n", curr_min, (int)TRE_CHAR_MAX)); + n = tre_ast_new_literal(ctx->mem, curr_min, TRE_CHAR_MAX, ctx->position); + if (n == NULL) + status = REG_ESPACE; + else + { + tre_literal_t *l = n->obj; + if (num_neg_classes > 0) + { + l->neg_classes = tre_mem_alloc(ctx->mem, + (sizeof(l->neg_classes) + * (num_neg_classes + 1))); + if (l->neg_classes == NULL) + { + status = REG_ESPACE; + goto parse_bracket_done; + } + for (k = 0; k < num_neg_classes; k++) + l->neg_classes[k] = neg_classes[k]; + l->neg_classes[k] = (tre_ctype_t)0; + } + else + l->neg_classes = NULL; + if (node == NULL) + node = n; + else + { + u = tre_ast_new_union(ctx->mem, node, n); + if (u == NULL) + status = REG_ESPACE; + node = u; + } + } + } + + if (status != REG_OK) + goto parse_bracket_done; + +#ifdef TRE_DEBUG + tre_ast_print(node); +#endif /* TRE_DEBUG */ + + parse_bracket_done: + xfree(items); + ctx->position++; + *result = node; + return status; +} + + +/* Parses a positive decimal integer. Returns -1 if the string does not + contain a valid number. */ +static int +tre_parse_int(const tre_char_t **regex, const tre_char_t *regex_end) +{ + int num = -1; + const tre_char_t *r = *regex; + while (r < regex_end && *r >= '0' && *r <= '9') + { + if (num < 0) + num = 0; + num = num * 10 + *r - '0'; + r++; + } + *regex = r; + return num; +} + + +static reg_errcode_t +tre_parse_bound(tre_parse_ctx_t *ctx, tre_ast_node_t **result) +{ + int min, max; + const tre_char_t *r = ctx->re; + const tre_char_t *start; + int counts_set = 0; + + /* Parse number (minimum repetition count). */ + min = -1; + if (r < ctx->re_end && *r >= '0' && *r <= '9') { + DPRINT(("tre_parse: min count: '%.*" STRF "'\n", ctx->re_end - r, r)); + min = tre_parse_int(&r, ctx->re_end); + } + + /* Parse comma and second number (maximum repetition count). */ + max = min; + if (r < ctx->re_end && *r == ',') + { + r++; + DPRINT(("tre_parse: max count: '%.*" STRF "'\n", ctx->re_end - r, r)); + max = tre_parse_int(&r, ctx->re_end); + } + + /* Check that the repeat counts are sane. */ + if ((max >= 0 && min > max) || max > RE_DUP_MAX) + return REG_BADBR; + + + /* + '{' + optionally followed immediately by a number == minimum repcount + optionally followed by , then a number == maximum repcount + */ + + + do { + int done; + start = r; + + /* Parse count limit settings */ + done = 0; + if (!counts_set) + while (r + 1 < ctx->re_end && !done) + { + switch (*r) + { + case ',': + r++; + break; + case ' ': + r++; + break; + case '}': + done = 1; + break; + default: + done = 1; + break; + } + } + } while (start != r); + + /* Missing }. */ + if (r >= ctx->re_end) + return REG_EBRACE; + + /* Empty contents of {}. */ + if (r == ctx->re) + return REG_BADBR; + + /* Parse the ending '}' or '\}'.*/ + if (ctx->cflags & REG_EXTENDED) + { + if (r >= ctx->re_end || *r != '}') + return REG_BADBR; + r++; + } + else + { + if (r + 1 >= ctx->re_end + || *r != '\\' + || *(r + 1) != '}') + return REG_BADBR; + r += 2; + } + + + /* Create the AST node(s). */ + if (min == 0 && max == 0) + { + *result = tre_ast_new_literal(ctx->mem, EMPTY, -1, -1); + if (*result == NULL) + return REG_ESPACE; + } + else + { + if (min < 0 && max < 0) + /* Only approximate parameters set, no repetitions. */ + min = max = 1; + + *result = tre_ast_new_iter(ctx->mem, *result, min, max); + if (!*result) + return REG_ESPACE; + } + + ctx->re = r; + return REG_OK; +} + +typedef enum { + PARSE_RE = 0, + PARSE_ATOM, + PARSE_MARK_FOR_SUBMATCH, + PARSE_BRANCH, + PARSE_PIECE, + PARSE_CATENATION, + PARSE_POST_CATENATION, + PARSE_UNION, + PARSE_POST_UNION, + PARSE_POSTFIX, + PARSE_RESTORE_CFLAGS +} tre_parse_re_stack_symbol_t; + + +static reg_errcode_t +tre_parse(tre_parse_ctx_t *ctx) +{ + tre_ast_node_t *result = NULL; + tre_parse_re_stack_symbol_t symbol; + reg_errcode_t status = REG_OK; + tre_stack_t *stack = ctx->stack; + int bottom = tre_stack_num_objects(stack); + int depth = 0; + + DPRINT(("tre_parse: parsing '%.*" STRF "', len = %d\n", + ctx->len, ctx->re, ctx->len)); + + if (!ctx->nofirstsub) + { + STACK_PUSH(stack, ctx->re); + STACK_PUSH(stack, ctx->submatch_id); + STACK_PUSH(stack, PARSE_MARK_FOR_SUBMATCH); + ctx->submatch_id++; + } + STACK_PUSH(stack, PARSE_RE); + ctx->re_start = ctx->re; + ctx->re_end = ctx->re + ctx->len; + + + /* The following is basically just a recursive descent parser. I use + an explicit stack instead of recursive functions mostly because of + two reasons: compatibility with systems which have an overflowable + call stack, and efficiency (both in lines of code and speed). */ + while (tre_stack_num_objects(stack) > bottom && status == REG_OK) + { + if (status != REG_OK) + break; + symbol = (tre_parse_re_stack_symbol_t)tre_stack_pop(stack); + switch (symbol) + { + case PARSE_RE: + /* Parse a full regexp. A regexp is one or more branches, + separated by the union operator `|'. */ + if (ctx->cflags & REG_EXTENDED) + STACK_PUSHX(stack, PARSE_UNION); + STACK_PUSHX(stack, PARSE_BRANCH); + break; + + case PARSE_BRANCH: + /* Parse a branch. A branch is one or more pieces, concatenated. + A piece is an atom possibly followed by a postfix operator. */ + STACK_PUSHX(stack, PARSE_CATENATION); + STACK_PUSHX(stack, PARSE_PIECE); + break; + + case PARSE_PIECE: + /* Parse a piece. A piece is an atom possibly followed by one + or more postfix operators. */ + STACK_PUSHX(stack, PARSE_POSTFIX); + STACK_PUSHX(stack, PARSE_ATOM); + break; + + case PARSE_CATENATION: + /* If the expression has not ended, parse another piece. */ + { + tre_char_t c; + if (ctx->re >= ctx->re_end) + break; + c = *ctx->re; + if (ctx->cflags & REG_EXTENDED && c == '|') + break; + if ((ctx->cflags & REG_EXTENDED + && c == ')' && depth > 0) + || (!(ctx->cflags & REG_EXTENDED) + && (c == '\\' + && *(ctx->re + 1) == ')'))) + { + if (!(ctx->cflags & REG_EXTENDED) && depth == 0) + status = REG_EPAREN; + DPRINT(("tre_parse: group end: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + depth--; + if (!(ctx->cflags & REG_EXTENDED)) + ctx->re += 2; + break; + } + + /* Left associative concatenation. */ + STACK_PUSHX(stack, PARSE_CATENATION); + STACK_PUSHX(stack, result); + STACK_PUSHX(stack, PARSE_POST_CATENATION); + STACK_PUSHX(stack, PARSE_PIECE); + break; + } + + case PARSE_POST_CATENATION: + { + tre_ast_node_t *tree = tre_stack_pop(stack); + tre_ast_node_t *tmp_node; + tmp_node = tre_ast_new_catenation(ctx->mem, tree, result); + if (!tmp_node) + return REG_ESPACE; + result = tmp_node; + break; + } + + case PARSE_UNION: + if (ctx->re >= ctx->re_end) + break; + switch (*ctx->re) + { + case '|': + DPRINT(("tre_parse: union: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + STACK_PUSHX(stack, PARSE_UNION); + STACK_PUSHX(stack, result); + STACK_PUSHX(stack, PARSE_POST_UNION); + STACK_PUSHX(stack, PARSE_BRANCH); + ctx->re++; + break; + + case ')': + ctx->re++; + break; + + default: + break; + } + break; + + case PARSE_POST_UNION: + { + tre_ast_node_t *tmp_node; + tre_ast_node_t *tree = tre_stack_pop(stack); + tmp_node = tre_ast_new_union(ctx->mem, tree, result); + if (!tmp_node) + return REG_ESPACE; + result = tmp_node; + break; + } + + case PARSE_POSTFIX: + /* Parse postfix operators. */ + if (ctx->re >= ctx->re_end) + break; + switch (*ctx->re) + { + case '+': + case '?': + if (!(ctx->cflags & REG_EXTENDED)) + break; + case '*': + { + tre_ast_node_t *tmp_node; + int rep_min = 0; + int rep_max = -1; + if (*ctx->re == '+') + rep_min = 1; + if (*ctx->re == '?') + rep_max = 1; + + ctx->re++; + tmp_node = tre_ast_new_iter(ctx->mem, result, rep_min, rep_max); + if (tmp_node == NULL) + return REG_ESPACE; + result = tmp_node; + STACK_PUSHX(stack, PARSE_POSTFIX); + break; + } + + case '\\': + /* "\{" is special without REG_EXTENDED */ + if (!(ctx->cflags & REG_EXTENDED) + && ctx->re + 1 < ctx->re_end + && *(ctx->re + 1) == '{') + { + ctx->re++; + goto parse_brace; + } + else + break; + + case '{': + /* "{" is literal without REG_EXTENDED */ + if (!(ctx->cflags & REG_EXTENDED)) + break; + + parse_brace: + DPRINT(("tre_parse: bound: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + ctx->re++; + + status = tre_parse_bound(ctx, &result); + if (status != REG_OK) + return status; + STACK_PUSHX(stack, PARSE_POSTFIX); + break; + } + break; + + case PARSE_ATOM: + /* Parse an atom. An atom is a regular expression enclosed in `()', + an empty set of `()', a bracket expression, `.', `^', `$', + a `\' followed by a character, or a single character. */ + + /* End of regexp? (empty string). */ + if (ctx->re >= ctx->re_end) + goto parse_literal; + + switch (*ctx->re) + { + case '(': /* parenthesized subexpression */ + + if (ctx->cflags & REG_EXTENDED + || (ctx->re > ctx->re_start + && *(ctx->re - 1) == '\\')) + { + depth++; + { + DPRINT(("tre_parse: group begin: '%.*" STRF + "', submatch %d\n", + ctx->re_end - ctx->re, ctx->re, + ctx->submatch_id)); + ctx->re++; + /* First parse a whole RE, then mark the resulting tree + for submatching. */ + STACK_PUSHX(stack, ctx->submatch_id); + STACK_PUSHX(stack, PARSE_MARK_FOR_SUBMATCH); + STACK_PUSHX(stack, PARSE_RE); + ctx->submatch_id++; + } + } + else + goto parse_literal; + break; + + case ')': /* end of current subexpression */ + if ((ctx->cflags & REG_EXTENDED && depth > 0) + || (ctx->re > ctx->re_start + && *(ctx->re - 1) == '\\')) + { + DPRINT(("tre_parse: empty: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + /* We were expecting an atom, but instead the current + subexpression was closed. POSIX leaves the meaning of + this to be implementation-defined. We interpret this as + an empty expression (which matches an empty string). */ + result = tre_ast_new_literal(ctx->mem, EMPTY, -1, -1); + if (result == NULL) + return REG_ESPACE; + if (!(ctx->cflags & REG_EXTENDED)) + ctx->re--; + } + else + goto parse_literal; + break; + + case '[': /* bracket expression */ + DPRINT(("tre_parse: bracket: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + ctx->re++; + status = tre_parse_bracket(ctx, &result); + if (status != REG_OK) + return status; + break; + + case '\\': + /* If this is "\(" or "\)" chew off the backslash and + try again. */ + if (!(ctx->cflags & REG_EXTENDED) + && ctx->re + 1 < ctx->re_end + && (*(ctx->re + 1) == '(' + || *(ctx->re + 1) == ')')) + { + ctx->re++; + STACK_PUSHX(stack, PARSE_ATOM); + break; + } + + if (ctx->re + 1 >= ctx->re_end) + /* Trailing backslash. */ + return REG_EESCAPE; + + DPRINT(("tre_parse: bleep: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + ctx->re++; + switch (*ctx->re) + { + default: + if (!(ctx->cflags & REG_EXTENDED) && tre_isdigit(*ctx->re)) + { + /* Back reference. */ + int val = *ctx->re - '0'; + DPRINT(("tre_parse: backref: '%.*" STRF "'\n", + ctx->re_end - ctx->re + 1, ctx->re - 1)); + result = tre_ast_new_literal(ctx->mem, BACKREF, val, + ctx->position); + if (result == NULL) + return REG_ESPACE; + ctx->position++; + ctx->max_backref = MAX(val, ctx->max_backref); + ctx->re++; + } + else + { + /* Escaped character. */ + DPRINT(("tre_parse: escaped: '%.*" STRF "'\n", + ctx->re_end - ctx->re + 1, ctx->re - 1)); + result = tre_ast_new_literal(ctx->mem, *ctx->re, *ctx->re, + ctx->position); + ctx->position++; + ctx->re++; + } + break; + } + if (result == NULL) + return REG_ESPACE; + break; + + case '.': /* the any-symbol */ + DPRINT(("tre_parse: any: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + if (ctx->cflags & REG_NEWLINE) + { + tre_ast_node_t *tmp1; + tre_ast_node_t *tmp2; + tmp1 = tre_ast_new_literal(ctx->mem, 0, '\n' - 1, + ctx->position); + if (!tmp1) + return REG_ESPACE; + tmp2 = tre_ast_new_literal(ctx->mem, '\n' + 1, TRE_CHAR_MAX, + ctx->position + 1); + if (!tmp2) + return REG_ESPACE; + result = tre_ast_new_union(ctx->mem, tmp1, tmp2); + if (!result) + return REG_ESPACE; + ctx->position += 2; + } + else + { + result = tre_ast_new_literal(ctx->mem, 0, TRE_CHAR_MAX, + ctx->position); + if (!result) + return REG_ESPACE; + ctx->position++; + } + ctx->re++; + break; + + case '^': /* beginning of line assertion */ + /* '^' has a special meaning everywhere in EREs, and in the + beginning of the RE and after \( is BREs. */ + if (ctx->cflags & REG_EXTENDED + || (ctx->re - 2 >= ctx->re_start + && *(ctx->re - 2) == '\\' + && *(ctx->re - 1) == '(') + || ctx->re == ctx->re_start) + { + DPRINT(("tre_parse: BOL: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + result = tre_ast_new_literal(ctx->mem, ASSERTION, + ASSERT_AT_BOL, -1); + if (result == NULL) + return REG_ESPACE; + ctx->re++; + } + else + goto parse_literal; + break; + + case '$': /* end of line assertion. */ + /* '$' is special everywhere in EREs, and in the end of the + string and before \) is BREs. */ + if (ctx->cflags & REG_EXTENDED + || (ctx->re + 2 < ctx->re_end + && *(ctx->re + 1) == '\\' + && *(ctx->re + 2) == ')') + || ctx->re + 1 == ctx->re_end) + { + DPRINT(("tre_parse: EOL: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + result = tre_ast_new_literal(ctx->mem, ASSERTION, + ASSERT_AT_EOL, -1); + if (result == NULL) + return REG_ESPACE; + ctx->re++; + } + else + goto parse_literal; + break; + + default: + parse_literal: + + /* We are expecting an atom. If the subexpression (or the whole + regexp ends here, we interpret it as an empty expression + (which matches an empty string). */ + if ( + (ctx->re >= ctx->re_end + || *ctx->re == '*' + || (ctx->cflags & REG_EXTENDED + && (*ctx->re == '|' + || *ctx->re == '{' + || *ctx->re == '+' + || *ctx->re == '?')) + /* Test for "\)" in BRE mode. */ + || (!(ctx->cflags & REG_EXTENDED) + && ctx->re + 1 < ctx->re_end + && *ctx->re == '\\' + && *(ctx->re + 1) == '{'))) + { + DPRINT(("tre_parse: empty: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + result = tre_ast_new_literal(ctx->mem, EMPTY, -1, -1); + if (!result) + return REG_ESPACE; + break; + } + + DPRINT(("tre_parse: literal: '%.*" STRF "'\n", + ctx->re_end - ctx->re, ctx->re)); + /* Note that we can't use an tre_isalpha() test here, since there + may be characters which are alphabetic but neither upper or + lower case. */ + if (ctx->cflags & REG_ICASE + && (tre_isupper(*ctx->re) || tre_islower(*ctx->re))) + { + tre_ast_node_t *tmp1; + tre_ast_node_t *tmp2; + + /* XXX - Can there be more than one opposite-case + counterpoints for some character in some locale? Or + more than two characters which all should be regarded + the same character if case is ignored? If yes, there + does not seem to be a portable way to detect it. I guess + that at least for multi-character collating elements there + could be several opposite-case counterpoints, but they + cannot be supported portably anyway. */ + tmp1 = tre_ast_new_literal(ctx->mem, tre_toupper(*ctx->re), + tre_toupper(*ctx->re), + ctx->position); + if (!tmp1) + return REG_ESPACE; + tmp2 = tre_ast_new_literal(ctx->mem, tre_tolower(*ctx->re), + tre_tolower(*ctx->re), + ctx->position); + if (!tmp2) + return REG_ESPACE; + result = tre_ast_new_union(ctx->mem, tmp1, tmp2); + if (!result) + return REG_ESPACE; + } + else + { + result = tre_ast_new_literal(ctx->mem, *ctx->re, *ctx->re, + ctx->position); + if (!result) + return REG_ESPACE; + } + ctx->position++; + ctx->re++; + break; + } + break; + + case PARSE_MARK_FOR_SUBMATCH: + { + int submatch_id = (int)tre_stack_pop(stack); + + if (result->submatch_id >= 0) + { + tre_ast_node_t *n, *tmp_node; + n = tre_ast_new_literal(ctx->mem, EMPTY, -1, -1); + if (n == NULL) + return REG_ESPACE; + tmp_node = tre_ast_new_catenation(ctx->mem, n, result); + if (tmp_node == NULL) + return REG_ESPACE; + tmp_node->num_submatches = result->num_submatches; + result = tmp_node; + } + result->submatch_id = submatch_id; + result->num_submatches++; + break; + } + + case PARSE_RESTORE_CFLAGS: + ctx->cflags = (int)tre_stack_pop(stack); + break; + } + } + + /* Check for missing closing parentheses. */ + if (depth > 0) + return REG_EPAREN; + + if (status == REG_OK) + ctx->result = result; + + return status; +} + + +/*********************************************************************** + from tre-compile.c +***********************************************************************/ + +/* + Algorithms to setup tags so that submatch addressing can be done. +*/ + + +/* Inserts a catenation node to the root of the tree given in `node'. + As the left child a new tag with number `tag_id' to `node' is added, + and the right child is the old root. */ +/* OR */ +/* Inserts a catenation node to the root of the tree given in `node'. + As the right child a new tag with number `tag_id' to `node' is added, + and the left child is the old root. */ +static reg_errcode_t +tre_add_tag(tre_mem_t mem, tre_ast_node_t *node, int tag_id, int right) +{ + tre_catenation_t *c; + tre_ast_node_t *child_tag, *child_old; + + DPRINT(("add_tag_%s: tag %d\n", right ? "right" : "left", tag_id)); + + c = tre_mem_alloc(mem, sizeof(*c)); + if (c == NULL) + return REG_ESPACE; + child_tag = tre_ast_new_literal(mem, TAG, tag_id, -1); + if (child_tag == NULL) + return REG_ESPACE; + child_old = tre_mem_alloc(mem, sizeof(tre_ast_node_t)); + if (child_old == NULL) + return REG_ESPACE; + + child_old->obj = node->obj; + child_old->type = node->type; + child_old->nullable = -1; + child_old->submatch_id = -1; + child_old->firstpos = NULL; + child_old->lastpos = NULL; + child_old->num_tags = 0; + node->obj = c; + node->type = CATENATION; + + c->right = c->left = child_old; + if (right) c->right = child_tag; + else c->left = child_tag; + + return REG_OK; +} + +typedef enum { + ADDTAGS_RECURSE, + ADDTAGS_AFTER_ITERATION, + ADDTAGS_AFTER_UNION_LEFT, + ADDTAGS_AFTER_UNION_RIGHT, + ADDTAGS_AFTER_CAT_LEFT, + ADDTAGS_AFTER_CAT_RIGHT, + ADDTAGS_SET_SUBMATCH_END +} tre_addtags_symbol_t; + + +typedef struct { + int tag; + int next_tag; +} tre_tag_states_t; + +/* Adds tags to appropriate locations in the parse tree in `tree', so that + subexpressions marked for submatch addressing can be traced. */ +static reg_errcode_t +tre_add_tags(tre_mem_t mem, tre_stack_t *stack, tre_ast_node_t *tree, + tre_tnfa_t *tnfa) +{ + reg_errcode_t status = REG_OK; + tre_addtags_symbol_t symbol; + tre_ast_node_t *node = tree; /* Tree node we are currently looking at. */ + int bottom = tre_stack_num_objects(stack); + /* True for first pass (counting number of needed tags) */ + int first_pass = (mem == NULL || tnfa == NULL); + int *regset, *orig_regset; + int num_tags = 0; /* Total number of tags. */ + int tag = 0; /* The tag that is to be added next. */ + int next_tag = 1; /* Next tag to use after this one. */ + int *parents; /* Stack of submatches the current submatch is + contained in. */ + tre_tag_states_t *saved_states; + + tre_tag_direction_t direction = TRE_TAG_MINIMIZE; + if (!first_pass) + tnfa->end_tag = 0; + + regset = xmalloc(sizeof(*regset) * ((tnfa->num_submatches + 1) * 2)); + if (regset == NULL) + return REG_ESPACE; + regset[0] = -1; + orig_regset = regset; + + parents = xmalloc(sizeof(*parents) * (tnfa->num_submatches + 1)); + if (parents == NULL) + { + xfree(regset); + return REG_ESPACE; + } + parents[0] = -1; + + saved_states = xmalloc(sizeof(*saved_states) * (tnfa->num_submatches + 1)); + if (saved_states == NULL) + { + xfree(regset); + xfree(parents); + return REG_ESPACE; + } + else + { + unsigned int i; + for (i = 0; i <= tnfa->num_submatches; i++) + saved_states[i].tag = -1; + } + + STACK_PUSH(stack, node); + STACK_PUSH(stack, ADDTAGS_RECURSE); + + while (tre_stack_num_objects(stack) > bottom) + { + if (status != REG_OK) + break; + + symbol = (tre_addtags_symbol_t)tre_stack_pop(stack); + switch (symbol) + { + + case ADDTAGS_SET_SUBMATCH_END: + { + int id = (int)tre_stack_pop(stack); + int i; + + /* Add end of this submatch to regset. */ + for (i = 0; regset[i] >= 0; i++); + regset[i] = id * 2 + 1; + regset[i + 1] = -1; + + /* Pop this submatch from the parents stack. */ + for (i = 0; parents[i] >= 0; i++); + parents[i - 1] = -1; + break; + } + + case ADDTAGS_RECURSE: + node = tre_stack_pop(stack); + + if (node->submatch_id >= 0) + { + int id = node->submatch_id; + int i; + + + /* Add start of this submatch to regset. */ + for (i = 0; regset[i] >= 0; i++); + regset[i] = id * 2; + regset[i + 1] = -1; + + if (!first_pass) + { + for (i = 0; parents[i] >= 0; i++); + tnfa->submatch_data[id].parents = NULL; + if (i > 0) + { + int *p = xmalloc(sizeof(*p) * (i + 1)); + if (p == NULL) + { + status = REG_ESPACE; + break; + } + assert(tnfa->submatch_data[id].parents == NULL); + tnfa->submatch_data[id].parents = p; + for (i = 0; parents[i] >= 0; i++) + p[i] = parents[i]; + p[i] = -1; + } + } + + /* Add end of this submatch to regset after processing this + node. */ + STACK_PUSHX(stack, node->submatch_id); + STACK_PUSHX(stack, ADDTAGS_SET_SUBMATCH_END); + } + + switch (node->type) + { + case LITERAL: + { + tre_literal_t *lit = node->obj; + + if (!IS_SPECIAL(lit) || IS_BACKREF(lit)) + { + int i; + DPRINT(("Literal %d-%d\n", + (int)lit->code_min, (int)lit->code_max)); + if (regset[0] >= 0) + { + /* Regset is not empty, so add a tag before the + literal or backref. */ + if (!first_pass) + { + status = tre_add_tag(mem, node, tag, 0 /*left*/); + tnfa->tag_directions[tag] = direction; + /* Go through the regset and set submatch data for + submatches that are using this tag. */ + for (i = 0; regset[i] >= 0; i++) + { + int id = regset[i] >> 1; + int start = !(regset[i] & 1); + DPRINT((" Using tag %d for %s offset of " + "submatch %d\n", tag, + start ? "start" : "end", id)); + if (start) + tnfa->submatch_data[id].so_tag = tag; + else + tnfa->submatch_data[id].eo_tag = tag; + } + } + else + { + DPRINT((" num_tags = 1\n")); + node->num_tags = 1; + } + + DPRINT((" num_tags++\n")); + regset[0] = -1; + tag = next_tag; + num_tags++; + next_tag++; + } + } + else + { + assert(!IS_TAG(lit)); + } + break; + } + case CATENATION: + { + tre_catenation_t *cat = node->obj; + tre_ast_node_t *left = cat->left; + tre_ast_node_t *right = cat->right; + int reserved_tag = -1; + DPRINT(("Catenation, next_tag = %d\n", next_tag)); + + + /* After processing right child. */ + STACK_PUSHX(stack, node); + STACK_PUSHX(stack, ADDTAGS_AFTER_CAT_RIGHT); + + /* Process right child. */ + STACK_PUSHX(stack, right); + STACK_PUSHX(stack, ADDTAGS_RECURSE); + + /* After processing left child. */ + STACK_PUSHX(stack, next_tag + left->num_tags); + DPRINT((" Pushing %d for after left\n", + next_tag + left->num_tags)); + if (left->num_tags > 0 && right->num_tags > 0) + { + /* Reserve the next tag to the right child. */ + DPRINT((" Reserving next_tag %d to right child\n", + next_tag)); + reserved_tag = next_tag; + next_tag++; + } + STACK_PUSHX(stack, reserved_tag); + STACK_PUSHX(stack, ADDTAGS_AFTER_CAT_LEFT); + + /* Process left child. */ + STACK_PUSHX(stack, left); + STACK_PUSHX(stack, ADDTAGS_RECURSE); + + } + break; + case ITERATION: + { + tre_iteration_t *iter = node->obj; + DPRINT(("Iteration\n")); + + if (first_pass) + { + STACK_PUSHX(stack, regset[0] >= 0); + } + else + { + STACK_PUSHX(stack, tag); + } + STACK_PUSHX(stack, node); + STACK_PUSHX(stack, ADDTAGS_AFTER_ITERATION); + + STACK_PUSHX(stack, iter->arg); + STACK_PUSHX(stack, ADDTAGS_RECURSE); + + /* Regset is not empty, so add a tag here. */ + if (regset[0] >= 0) + { + if (!first_pass) + { + int i; + status = tre_add_tag(mem, node, tag, 0 /*left*/); + tnfa->tag_directions[tag] = direction; + /* Go through the regset and set submatch data for + submatches that are using this tag. */ + for (i = 0; regset[i] >= 0; i++) + { + int id = regset[i] >> 1; + int start = !(regset[i] & 1); + DPRINT((" Using tag %d for %s offset of " + "submatch %d\n", tag, + start ? "start" : "end", id)); + if (start) + tnfa->submatch_data[id].so_tag = tag; + else + tnfa->submatch_data[id].eo_tag = tag; + } + } + + DPRINT((" num_tags++\n")); + regset[0] = -1; + tag = next_tag; + num_tags++; + next_tag++; + } + direction = TRE_TAG_MINIMIZE; + } + break; + case UNION: + { + tre_union_t *uni = node->obj; + tre_ast_node_t *left = uni->left; + tre_ast_node_t *right = uni->right; + int left_tag; + int right_tag; + + if (regset[0] >= 0) + { + left_tag = next_tag; + right_tag = next_tag + 1; + } + else + { + left_tag = tag; + right_tag = next_tag; + } + + DPRINT(("Union\n")); + + /* After processing right child. */ + STACK_PUSHX(stack, right_tag); + STACK_PUSHX(stack, left_tag); + STACK_PUSHX(stack, regset); + STACK_PUSHX(stack, regset[0] >= 0); + STACK_PUSHX(stack, node); + STACK_PUSHX(stack, right); + STACK_PUSHX(stack, left); + STACK_PUSHX(stack, ADDTAGS_AFTER_UNION_RIGHT); + + /* Process right child. */ + STACK_PUSHX(stack, right); + STACK_PUSHX(stack, ADDTAGS_RECURSE); + + /* After processing left child. */ + STACK_PUSHX(stack, ADDTAGS_AFTER_UNION_LEFT); + + /* Process left child. */ + STACK_PUSHX(stack, left); + STACK_PUSHX(stack, ADDTAGS_RECURSE); + + /* Regset is not empty, so add a tag here. */ + if (regset[0] >= 0) + { + if (!first_pass) + { + int i; + status = tre_add_tag(mem, node, tag, 0 /*left*/); + tnfa->tag_directions[tag] = direction; + /* Go through the regset and set submatch data for + submatches that are using this tag. */ + for (i = 0; regset[i] >= 0; i++) + { + int id = regset[i] >> 1; + int start = !(regset[i] & 1); + DPRINT((" Using tag %d for %s offset of " + "submatch %d\n", tag, + start ? "start" : "end", id)); + if (start) + tnfa->submatch_data[id].so_tag = tag; + else + tnfa->submatch_data[id].eo_tag = tag; + } + } + + DPRINT((" num_tags++\n")); + regset[0] = -1; + tag = next_tag; + num_tags++; + next_tag++; + } + + if (node->num_submatches > 0) + { + /* The next two tags are reserved for markers. */ + next_tag++; + tag = next_tag; + next_tag++; + } + + break; + } + } + + if (node->submatch_id >= 0) + { + int i; + /* Push this submatch on the parents stack. */ + for (i = 0; parents[i] >= 0; i++); + parents[i] = node->submatch_id; + parents[i + 1] = -1; + } + + break; /* end case: ADDTAGS_RECURSE */ + + case ADDTAGS_AFTER_ITERATION: + { + int enter_tag; + node = tre_stack_pop(stack); + if (first_pass) + node->num_tags = ((tre_iteration_t *)node->obj)->arg->num_tags + + (int)tre_stack_pop(stack); + else + enter_tag = (int)tre_stack_pop(stack); + + DPRINT(("After iteration\n")); + direction = TRE_TAG_MAXIMIZE; + break; + } + + case ADDTAGS_AFTER_CAT_LEFT: + { + int new_tag = (int)tre_stack_pop(stack); + next_tag = (int)tre_stack_pop(stack); + DPRINT(("After cat left, tag = %d, next_tag = %d\n", + tag, next_tag)); + if (new_tag >= 0) + { + DPRINT((" Setting tag to %d\n", new_tag)); + tag = new_tag; + } + break; + } + + case ADDTAGS_AFTER_CAT_RIGHT: + DPRINT(("After cat right\n")); + node = tre_stack_pop(stack); + if (first_pass) + node->num_tags = ((tre_catenation_t *)node->obj)->left->num_tags + + ((tre_catenation_t *)node->obj)->right->num_tags; + break; + + case ADDTAGS_AFTER_UNION_LEFT: + DPRINT(("After union left\n")); + /* Lift the bottom of the `regset' array so that when processing + the right operand the items currently in the array are + invisible. The original bottom was saved at ADDTAGS_UNION and + will be restored at ADDTAGS_AFTER_UNION_RIGHT below. */ + while (*regset >= 0) + regset++; + break; + + case ADDTAGS_AFTER_UNION_RIGHT: + { + int added_tags, tag_left, tag_right; + tre_ast_node_t *left = tre_stack_pop(stack); + tre_ast_node_t *right = tre_stack_pop(stack); + DPRINT(("After union right\n")); + node = tre_stack_pop(stack); + added_tags = (int)tre_stack_pop(stack); + if (first_pass) + { + node->num_tags = ((tre_union_t *)node->obj)->left->num_tags + + ((tre_union_t *)node->obj)->right->num_tags + added_tags + + ((node->num_submatches > 0) ? 2 : 0); + } + regset = tre_stack_pop(stack); + tag_left = (int)tre_stack_pop(stack); + tag_right = (int)tre_stack_pop(stack); + + /* Add tags after both children, the left child gets a smaller + tag than the right child. This guarantees that we prefer + the left child over the right child. */ + /* XXX - This is not always necessary (if the children have + tags which must be seen for every match of that child). */ + /* XXX - Check if this is the only place where tre_add_tag_right + is used. If so, use tre_add_tag_left (putting the tag before + the child as opposed after the child) and throw away + tre_add_tag_right. */ + if (node->num_submatches > 0) + { + if (!first_pass) + { + status = tre_add_tag(mem, left, tag_left, 1 /*right*/); + tnfa->tag_directions[tag] = TRE_TAG_MAXIMIZE; + status = tre_add_tag(mem, right, tag_right, 1 /*right*/); + tnfa->tag_directions[tag] = TRE_TAG_MAXIMIZE; + } + DPRINT((" num_tags += 2\n")); + num_tags += 2; + } + direction = TRE_TAG_MAXIMIZE; + break; + } + + default: + assert(0); + break; + + } /* end switch(symbol) */ + } /* end while(tre_stack_num_objects(stack) > bottom) */ + + if (!first_pass) + { + int i; + /* Go through the regset and set submatch data for + submatches that are using this tag. */ + for (i = 0; regset[i] >= 0; i++) + { + int id = regset[i] >> 1; + int start = !(regset[i] & 1); + DPRINT((" Using tag %d for %s offset of " + "submatch %d\n", num_tags, + start ? "start" : "end", id)); + if (start) + tnfa->submatch_data[id].so_tag = num_tags; + else + tnfa->submatch_data[id].eo_tag = num_tags; + } + } + + DPRINT(("tre_add_tags: %s complete. Number of tags %d.\n", + first_pass? "First pass" : "Second pass", num_tags)); + + assert(tree->num_tags == num_tags); + tnfa->end_tag = num_tags; + tnfa->num_tags = num_tags; + xfree(orig_regset); + xfree(parents); + xfree(saved_states); + return status; +} + + + +/* + AST to TNFA compilation routines. +*/ + +typedef enum { + COPY_RECURSE, + COPY_SET_RESULT_PTR +} tre_copyast_symbol_t; + +/* Flags for tre_copy_ast(). */ +#define COPY_REMOVE_TAGS 1 +#define COPY_MAXIMIZE_FIRST_TAG 2 + +static reg_errcode_t +tre_copy_ast(tre_mem_t mem, tre_stack_t *stack, tre_ast_node_t *ast, + int flags, int *pos_add, tre_tag_direction_t *tag_directions, + tre_ast_node_t **copy, int *max_pos) +{ + reg_errcode_t status = REG_OK; + int bottom = tre_stack_num_objects(stack); + int num_copied = 0; + int first_tag = 1; + tre_ast_node_t **result = copy; + tre_copyast_symbol_t symbol; + + STACK_PUSH(stack, ast); + STACK_PUSH(stack, COPY_RECURSE); + + while (status == REG_OK && tre_stack_num_objects(stack) > bottom) + { + tre_ast_node_t *node; + if (status != REG_OK) + break; + + symbol = (tre_copyast_symbol_t)tre_stack_pop(stack); + switch (symbol) + { + case COPY_SET_RESULT_PTR: + result = tre_stack_pop(stack); + break; + case COPY_RECURSE: + node = tre_stack_pop(stack); + switch (node->type) + { + case LITERAL: + { + tre_literal_t *lit = node->obj; + int pos = lit->position; + int min = lit->code_min; + int max = lit->code_max; + if (!IS_SPECIAL(lit) || IS_BACKREF(lit)) + { + /* XXX - e.g. [ab] has only one position but two + nodes, so we are creating holes in the state space + here. Not fatal, just wastes memory. */ + pos += *pos_add; + num_copied++; + } + else if (IS_TAG(lit) && (flags & COPY_REMOVE_TAGS)) + { + /* Change this tag to empty. */ + min = EMPTY; + max = pos = -1; + } + else if (IS_TAG(lit) && (flags & COPY_MAXIMIZE_FIRST_TAG) + && first_tag) + { + /* Maximize the first tag. */ + tag_directions[max] = TRE_TAG_MAXIMIZE; + first_tag = 0; + } + *result = tre_ast_new_literal(mem, min, max, pos); + if (*result == NULL) + status = REG_ESPACE; + + if (pos > *max_pos) + *max_pos = pos; + break; + } + case UNION: + { + tre_union_t *uni = node->obj; + tre_union_t *copy; + *result = tre_ast_new_union(mem, uni->left, uni->right); + if (*result == NULL) + { + status = REG_ESPACE; + break; + } + copy = (*result)->obj; + result = ©->left; + STACK_PUSHX(stack, uni->right); + STACK_PUSHX(stack, COPY_RECURSE); + STACK_PUSHX(stack, ©->right); + STACK_PUSHX(stack, COPY_SET_RESULT_PTR); + STACK_PUSHX(stack, uni->left); + STACK_PUSHX(stack, COPY_RECURSE); + break; + } + case CATENATION: + { + tre_catenation_t *cat = node->obj; + tre_catenation_t *copy; + *result = tre_ast_new_catenation(mem, cat->left, cat->right); + if (*result == NULL) + { + status = REG_ESPACE; + break; + } + copy = (*result)->obj; + copy->left = NULL; + copy->right = NULL; + result = ©->left; + + STACK_PUSHX(stack, cat->right); + STACK_PUSHX(stack, COPY_RECURSE); + STACK_PUSHX(stack, ©->right); + STACK_PUSHX(stack, COPY_SET_RESULT_PTR); + STACK_PUSHX(stack, cat->left); + STACK_PUSHX(stack, COPY_RECURSE); + break; + } + case ITERATION: + { + tre_iteration_t *iter = node->obj; + STACK_PUSHX(stack, iter->arg); + STACK_PUSHX(stack, COPY_RECURSE); + *result = tre_ast_new_iter(mem, iter->arg, iter->min, iter->max); + if (*result == NULL) + { + status = REG_ESPACE; + break; + } + iter = (*result)->obj; + result = &iter->arg; + break; + } + default: + assert(0); + break; + } + break; + } + } + *pos_add += num_copied; + return status; +} + +typedef enum { + EXPAND_RECURSE, + EXPAND_AFTER_ITER +} tre_expand_ast_symbol_t; + +/* Expands each iteration node that has a finite nonzero minimum or maximum + iteration count to a catenated sequence of copies of the node. */ +static reg_errcode_t +tre_expand_ast(tre_mem_t mem, tre_stack_t *stack, tre_ast_node_t *ast, + int *position, tre_tag_direction_t *tag_directions, + int *max_depth) +{ + reg_errcode_t status = REG_OK; + int bottom = tre_stack_num_objects(stack); + int pos_add = 0; + int pos_add_total = 0; + int max_pos = 0; + /* Approximate parameter nesting level. */ + int iter_depth = 0; + + STACK_PUSHR(stack, ast); + STACK_PUSHR(stack, EXPAND_RECURSE); + while (status == REG_OK && tre_stack_num_objects(stack) > bottom) + { + tre_ast_node_t *node; + tre_expand_ast_symbol_t symbol; + + if (status != REG_OK) + break; + + DPRINT(("pos_add %d\n", pos_add)); + + symbol = (tre_expand_ast_symbol_t)tre_stack_pop(stack); + node = tre_stack_pop(stack); + switch (symbol) + { + case EXPAND_RECURSE: + switch (node->type) + { + case LITERAL: + { + tre_literal_t *lit= node->obj; + if (!IS_SPECIAL(lit) || IS_BACKREF(lit)) + { + lit->position += pos_add; + if (lit->position > max_pos) + max_pos = lit->position; + } + break; + } + case UNION: + { + tre_union_t *uni = node->obj; + STACK_PUSHX(stack, uni->right); + STACK_PUSHX(stack, EXPAND_RECURSE); + STACK_PUSHX(stack, uni->left); + STACK_PUSHX(stack, EXPAND_RECURSE); + break; + } + case CATENATION: + { + tre_catenation_t *cat = node->obj; + STACK_PUSHX(stack, cat->right); + STACK_PUSHX(stack, EXPAND_RECURSE); + STACK_PUSHX(stack, cat->left); + STACK_PUSHX(stack, EXPAND_RECURSE); + break; + } + case ITERATION: + { + tre_iteration_t *iter = node->obj; + STACK_PUSHX(stack, pos_add); + STACK_PUSHX(stack, node); + STACK_PUSHX(stack, EXPAND_AFTER_ITER); + STACK_PUSHX(stack, iter->arg); + STACK_PUSHX(stack, EXPAND_RECURSE); + /* If we are going to expand this node at EXPAND_AFTER_ITER + then don't increase the `pos' fields of the nodes now, it + will get done when expanding. */ + if (iter->min > 1 || iter->max > 1) + pos_add = 0; + iter_depth++; + DPRINT(("iter\n")); + break; + } + default: + assert(0); + break; + } + break; + case EXPAND_AFTER_ITER: + { + tre_iteration_t *iter = node->obj; + int pos_add_last; + pos_add = (int)tre_stack_pop(stack); + pos_add_last = pos_add; + if (iter->min > 1 || iter->max > 1) + { + tre_ast_node_t *seq1 = NULL, *seq2 = NULL; + int i; + int pos_add_save = pos_add; + + /* Create a catenated sequence of copies of the node. */ + for (i = 0; i < iter->min; i++) + { + tre_ast_node_t *copy; + /* Remove tags from all but the last copy. */ + int flags = ((i + 1 < iter->min) + ? COPY_REMOVE_TAGS + : COPY_MAXIMIZE_FIRST_TAG); + DPRINT((" pos_add %d\n", pos_add)); + pos_add_save = pos_add; + status = tre_copy_ast(mem, stack, iter->arg, flags, + &pos_add, tag_directions, ©, + &max_pos); + if (status != REG_OK) + return status; + if (seq1 != NULL) + seq1 = tre_ast_new_catenation(mem, seq1, copy); + else + seq1 = copy; + if (seq1 == NULL) + return REG_ESPACE; + } + + if (iter->max == -1) + { + /* No upper limit. */ + pos_add_save = pos_add; + status = tre_copy_ast(mem, stack, iter->arg, 0, + &pos_add, NULL, &seq2, &max_pos); + if (status != REG_OK) + return status; + seq2 = tre_ast_new_iter(mem, seq2, 0, -1); + if (seq2 == NULL) + return REG_ESPACE; + } + else + { + for (i = iter->min; i < iter->max; i++) + { + tre_ast_node_t *tmp, *copy; + pos_add_save = pos_add; + status = tre_copy_ast(mem, stack, iter->arg, 0, + &pos_add, NULL, ©, &max_pos); + if (status != REG_OK) + return status; + if (seq2 != NULL) + seq2 = tre_ast_new_catenation(mem, copy, seq2); + else + seq2 = copy; + if (seq2 == NULL) + return REG_ESPACE; + tmp = tre_ast_new_literal(mem, EMPTY, -1, -1); + if (tmp == NULL) + return REG_ESPACE; + seq2 = tre_ast_new_union(mem, tmp, seq2); + if (seq2 == NULL) + return REG_ESPACE; + } + } + + pos_add = pos_add_save; + if (seq1 == NULL) + seq1 = seq2; + else if (seq2 != NULL) + seq1 = tre_ast_new_catenation(mem, seq1, seq2); + if (seq1 == NULL) + return REG_ESPACE; + node->obj = seq1->obj; + node->type = seq1->type; + } + + iter_depth--; + pos_add_total += pos_add - pos_add_last; + if (iter_depth == 0) + pos_add = pos_add_total; + + break; + } + default: + assert(0); + break; + } + } + + *position += pos_add_total; + + /* `max_pos' should never be larger than `*position' if the above + code works, but just an extra safeguard let's make sure + `*position' is set large enough so enough memory will be + allocated for the transition table. */ + if (max_pos > *position) + *position = max_pos; + +#ifdef TRE_DEBUG + DPRINT(("Expanded AST:\n")); + tre_ast_print(ast); + DPRINT(("*position %d, max_pos %d\n", *position, max_pos)); +#endif + + return status; +} + +static tre_pos_and_tags_t * +tre_set_empty(tre_mem_t mem) +{ + tre_pos_and_tags_t *new_set; + + new_set = tre_mem_calloc(mem, sizeof(*new_set)); + if (new_set == NULL) + return NULL; + + new_set[0].position = -1; + new_set[0].code_min = -1; + new_set[0].code_max = -1; + + return new_set; +} + +static tre_pos_and_tags_t * +tre_set_one(tre_mem_t mem, int position, int code_min, int code_max, + tre_ctype_t class, tre_ctype_t *neg_classes, int backref) +{ + tre_pos_and_tags_t *new_set; + + new_set = tre_mem_calloc(mem, sizeof(*new_set) * 2); + if (new_set == NULL) + return NULL; + + new_set[0].position = position; + new_set[0].code_min = code_min; + new_set[0].code_max = code_max; + new_set[0].class = class; + new_set[0].neg_classes = neg_classes; + new_set[0].backref = backref; + new_set[1].position = -1; + new_set[1].code_min = -1; + new_set[1].code_max = -1; + + return new_set; +} + +static tre_pos_and_tags_t * +tre_set_union(tre_mem_t mem, tre_pos_and_tags_t *set1, tre_pos_and_tags_t *set2, + int *tags, int assertions) +{ + int s1, s2, i, j; + tre_pos_and_tags_t *new_set; + int *new_tags; + int num_tags; + + for (num_tags = 0; tags != NULL && tags[num_tags] >= 0; num_tags++); + for (s1 = 0; set1[s1].position >= 0; s1++); + for (s2 = 0; set2[s2].position >= 0; s2++); + new_set = tre_mem_calloc(mem, sizeof(*new_set) * (s1 + s2 + 1)); + if (!new_set ) + return NULL; + + for (s1 = 0; set1[s1].position >= 0; s1++) + { + new_set[s1].position = set1[s1].position; + new_set[s1].code_min = set1[s1].code_min; + new_set[s1].code_max = set1[s1].code_max; + new_set[s1].assertions = set1[s1].assertions | assertions; + new_set[s1].class = set1[s1].class; + new_set[s1].neg_classes = set1[s1].neg_classes; + new_set[s1].backref = set1[s1].backref; + if (set1[s1].tags == NULL && tags == NULL) + new_set[s1].tags = NULL; + else + { + for (i = 0; set1[s1].tags != NULL && set1[s1].tags[i] >= 0; i++); + new_tags = tre_mem_alloc(mem, (sizeof(*new_tags) + * (i + num_tags + 1))); + if (new_tags == NULL) + return NULL; + for (j = 0; j < i; j++) + new_tags[j] = set1[s1].tags[j]; + for (i = 0; i < num_tags; i++) + new_tags[j + i] = tags[i]; + new_tags[j + i] = -1; + new_set[s1].tags = new_tags; + } + } + + for (s2 = 0; set2[s2].position >= 0; s2++) + { + new_set[s1 + s2].position = set2[s2].position; + new_set[s1 + s2].code_min = set2[s2].code_min; + new_set[s1 + s2].code_max = set2[s2].code_max; + /* XXX - why not | assertions here as well? */ + new_set[s1 + s2].assertions = set2[s2].assertions; + new_set[s1 + s2].class = set2[s2].class; + new_set[s1 + s2].neg_classes = set2[s2].neg_classes; + new_set[s1 + s2].backref = set2[s2].backref; + if (set2[s2].tags == NULL) + new_set[s1 + s2].tags = NULL; + else + { + for (i = 0; set2[s2].tags[i] >= 0; i++); + new_tags = tre_mem_alloc(mem, sizeof(*new_tags) * (i + 1)); + if (new_tags == NULL) + return NULL; + for (j = 0; j < i; j++) + new_tags[j] = set2[s2].tags[j]; + new_tags[j] = -1; + new_set[s1 + s2].tags = new_tags; + } + } + new_set[s1 + s2].position = -1; + return new_set; +} + +/* Finds the empty path through `node' which is the one that should be + taken according to POSIX.2 rules, and adds the tags on that path to + `tags'. `tags' may be NULL. If `num_tags_seen' is not NULL, it is + set to the number of tags seen on the path. */ +static reg_errcode_t +tre_match_empty(tre_stack_t *stack, tre_ast_node_t *node, int *tags, + int *assertions, int *num_tags_seen) +{ + tre_literal_t *lit; + tre_union_t *uni; + tre_catenation_t *cat; + tre_iteration_t *iter; + int i; + int bottom = tre_stack_num_objects(stack); + reg_errcode_t status = REG_OK; + if (num_tags_seen) + *num_tags_seen = 0; + + status = tre_stack_push(stack, node); + + /* Walk through the tree recursively. */ + while (status == REG_OK && tre_stack_num_objects(stack) > bottom) + { + node = tre_stack_pop(stack); + + switch (node->type) + { + case LITERAL: + lit = (tre_literal_t *)node->obj; + switch (lit->code_min) + { + case TAG: + if (lit->code_max >= 0) + { + if (tags != NULL) + { + /* Add the tag to `tags'. */ + for (i = 0; tags[i] >= 0; i++) + if (tags[i] == lit->code_max) + break; + if (tags[i] < 0) + { + tags[i] = lit->code_max; + tags[i + 1] = -1; + } + } + if (num_tags_seen) + (*num_tags_seen)++; + } + break; + case ASSERTION: + assert(lit->code_max >= 1 + || lit->code_max <= ASSERT_LAST); + if (assertions != NULL) + *assertions |= lit->code_max; + break; + case EMPTY: + break; + default: + assert(0); + break; + } + break; + + case UNION: + /* Subexpressions starting earlier take priority over ones + starting later, so we prefer the left subexpression over the + right subexpression. */ + uni = (tre_union_t *)node->obj; + if (uni->left->nullable) + STACK_PUSHX(stack, uni->left) + else if (uni->right->nullable) + STACK_PUSHX(stack, uni->right) + else + assert(0); + break; + + case CATENATION: + /* The path must go through both children. */ + cat = (tre_catenation_t *)node->obj; + assert(cat->left->nullable); + assert(cat->right->nullable); + STACK_PUSHX(stack, cat->left); + STACK_PUSHX(stack, cat->right); + break; + + case ITERATION: + /* A match with an empty string is preferred over no match at + all, so we go through the argument if possible. */ + iter = (tre_iteration_t *)node->obj; + if (iter->arg->nullable) + STACK_PUSHX(stack, iter->arg); + break; + + default: + assert(0); + break; + } + } + + return status; +} + + +typedef enum { + NFL_RECURSE, + NFL_POST_UNION, + NFL_POST_CATENATION, + NFL_POST_ITERATION +} tre_nfl_stack_symbol_t; + + +/* Computes and fills in the fields `nullable', `firstpos', and `lastpos' for + the nodes of the AST `tree'. */ +static reg_errcode_t +tre_compute_nfl(tre_mem_t mem, tre_stack_t *stack, tre_ast_node_t *tree) +{ + int bottom = tre_stack_num_objects(stack); + + STACK_PUSHR(stack, tree); + STACK_PUSHR(stack, NFL_RECURSE); + + while (tre_stack_num_objects(stack) > bottom) + { + tre_nfl_stack_symbol_t symbol; + tre_ast_node_t *node; + + symbol = (tre_nfl_stack_symbol_t) tre_stack_pop(stack); + node = tre_stack_pop(stack); + switch (symbol) + { + case NFL_RECURSE: + switch (node->type) + { + case LITERAL: + { + tre_literal_t *lit = (tre_literal_t *)node->obj; + if (IS_BACKREF(lit)) + { + /* Back references: nullable = false, firstpos = {i}, + lastpos = {i}. */ + node->nullable = 0; + node->firstpos = tre_set_one(mem, lit->position, 0, + TRE_CHAR_MAX, 0, NULL, -1); + if (!node->firstpos) + return REG_ESPACE; + node->lastpos = tre_set_one(mem, lit->position, 0, + TRE_CHAR_MAX, 0, NULL, + lit->code_max); + if (!node->lastpos) + return REG_ESPACE; + } + else if (lit->code_min < 0) + { + /* Tags, empty strings and zero width assertions: + nullable = true, firstpos = {}, and lastpos = {}. */ + node->nullable = 1; + node->firstpos = tre_set_empty(mem); + if (!node->firstpos) + return REG_ESPACE; + node->lastpos = tre_set_empty(mem); + if (!node->lastpos) + return REG_ESPACE; + } + else + { + /* Literal at position i: nullable = false, firstpos = {i}, + lastpos = {i}. */ + node->nullable = 0; + node->firstpos = + tre_set_one(mem, lit->position, lit->code_min, + lit->code_max, 0, NULL, -1); + if (!node->firstpos) + return REG_ESPACE; + node->lastpos = tre_set_one(mem, lit->position, + lit->code_min, lit->code_max, + lit->class, lit->neg_classes, + -1); + if (!node->lastpos) + return REG_ESPACE; + } + break; + } + + case UNION: + /* Compute the attributes for the two subtrees, and after that + for this node. */ + STACK_PUSHR(stack, node); + STACK_PUSHR(stack, NFL_POST_UNION); + STACK_PUSHR(stack, ((tre_union_t *)node->obj)->right); + STACK_PUSHR(stack, NFL_RECURSE); + STACK_PUSHR(stack, ((tre_union_t *)node->obj)->left); + STACK_PUSHR(stack, NFL_RECURSE); + break; + + case CATENATION: + /* Compute the attributes for the two subtrees, and after that + for this node. */ + STACK_PUSHR(stack, node); + STACK_PUSHR(stack, NFL_POST_CATENATION); + STACK_PUSHR(stack, ((tre_catenation_t *)node->obj)->right); + STACK_PUSHR(stack, NFL_RECURSE); + STACK_PUSHR(stack, ((tre_catenation_t *)node->obj)->left); + STACK_PUSHR(stack, NFL_RECURSE); + break; + + case ITERATION: + /* Compute the attributes for the subtree, and after that for + this node. */ + STACK_PUSHR(stack, node); + STACK_PUSHR(stack, NFL_POST_ITERATION); + STACK_PUSHR(stack, ((tre_iteration_t *)node->obj)->arg); + STACK_PUSHR(stack, NFL_RECURSE); + break; + } + break; /* end case: NFL_RECURSE */ + + case NFL_POST_UNION: + { + tre_union_t *uni = (tre_union_t *)node->obj; + node->nullable = uni->left->nullable || uni->right->nullable; + node->firstpos = tre_set_union(mem, uni->left->firstpos, + uni->right->firstpos, NULL, 0); + if (!node->firstpos) + return REG_ESPACE; + node->lastpos = tre_set_union(mem, uni->left->lastpos, + uni->right->lastpos, NULL, 0); + if (!node->lastpos) + return REG_ESPACE; + break; + } + + case NFL_POST_ITERATION: + { + tre_iteration_t *iter = (tre_iteration_t *)node->obj; + + if (iter->min == 0 || iter->arg->nullable) + node->nullable = 1; + else + node->nullable = 0; + node->firstpos = iter->arg->firstpos; + node->lastpos = iter->arg->lastpos; + break; + } + + case NFL_POST_CATENATION: + { + int num_tags, *tags, assertions; + reg_errcode_t status; + tre_catenation_t *cat = node->obj; + node->nullable = cat->left->nullable && cat->right->nullable; + + /* Compute firstpos. */ + if (cat->left->nullable) + { + /* The left side matches the empty string. Make a first pass + with tre_match_empty() to get the number of tags. */ + status = tre_match_empty(stack, cat->left, + NULL, NULL, &num_tags); + if (status != REG_OK) + return status; + /* Allocate arrays for the tags and parameters. */ + tags = xmalloc(sizeof(*tags) * (num_tags + 1)); + if (!tags) + return REG_ESPACE; + tags[0] = -1; + assertions = 0; + /* Second pass with tre_mach_empty() to get the list of + tags. */ + status = tre_match_empty(stack, cat->left, tags, + &assertions, NULL); + if (status != REG_OK) + { + xfree(tags); + return status; + } + node->firstpos = + tre_set_union(mem, cat->right->firstpos, cat->left->firstpos, + tags, assertions); + xfree(tags); + if (!node->firstpos) + return REG_ESPACE; + } + else + { + node->firstpos = cat->left->firstpos; + } + + /* Compute lastpos. */ + if (cat->right->nullable) + { + /* The right side matches the empty string. Make a first pass + with tre_match_empty() to get the number of tags. */ + status = tre_match_empty(stack, cat->right, + NULL, NULL, &num_tags); + if (status != REG_OK) + return status; + /* Allocate arrays for the tags and parameters. */ + tags = xmalloc(sizeof(int) * (num_tags + 1)); + if (!tags) + return REG_ESPACE; + tags[0] = -1; + assertions = 0; + /* Second pass with tre_mach_empty() to get the list of + tags. */ + status = tre_match_empty(stack, cat->right, tags, + &assertions, NULL); + if (status != REG_OK) + { + xfree(tags); + return status; + } + node->lastpos = + tre_set_union(mem, cat->left->lastpos, cat->right->lastpos, + tags, assertions); + xfree(tags); + if (!node->lastpos) + return REG_ESPACE; + } + else + { + node->lastpos = cat->right->lastpos; + } + break; + } + + default: + assert(0); + break; + } + } + + return REG_OK; +} + + +/* Adds a transition from each position in `p1' to each position in `p2'. */ +static reg_errcode_t +tre_make_trans(tre_pos_and_tags_t *p1, tre_pos_and_tags_t *p2, + tre_tnfa_transition_t *transitions, + int *counts, int *offs) +{ + tre_pos_and_tags_t *orig_p2 = p2; + tre_tnfa_transition_t *trans; + int i, j, k, l, dup, prev_p2_pos; + + if (transitions != NULL) + while (p1->position >= 0) + { + p2 = orig_p2; + prev_p2_pos = -1; + while (p2->position >= 0) + { + /* Optimization: if this position was already handled, skip it. */ + if (p2->position == prev_p2_pos) + { + p2++; + continue; + } + prev_p2_pos = p2->position; + /* Set `trans' to point to the next unused transition from + position `p1->position'. */ + trans = transitions + offs[p1->position]; + while (trans->state != NULL) + { +#if 0 + /* If we find a previous transition from `p1->position' to + `p2->position', it is overwritten. This can happen only + if there are nested loops in the regexp, like in "((a)*)*". + In POSIX.2 repetition using the outer loop is always + preferred over using the inner loop. Therefore the + transition for the inner loop is useless and can be thrown + away. */ + /* XXX - The same position is used for all nodes in a bracket + expression, so this optimization cannot be used (it will + break bracket expressions) unless I figure out a way to + detect it here. */ + if (trans->state_id == p2->position) + { + DPRINT(("*")); + break; + } +#endif + trans++; + } + + if (trans->state == NULL) + (trans + 1)->state = NULL; + /* Use the character ranges, assertions, etc. from `p1' for + the transition from `p1' to `p2'. */ + trans->code_min = p1->code_min; + trans->code_max = p1->code_max; + trans->state = transitions + offs[p2->position]; + trans->state_id = p2->position; + trans->assertions = p1->assertions | p2->assertions + | (p1->class ? ASSERT_CHAR_CLASS : 0) + | (p1->neg_classes != NULL ? ASSERT_CHAR_CLASS_NEG : 0); + if (p1->backref >= 0) + { + assert((trans->assertions & ASSERT_CHAR_CLASS) == 0); + assert(p2->backref < 0); + trans->u.backref = p1->backref; + trans->assertions |= ASSERT_BACKREF; + } + else + trans->u.class = p1->class; + if (p1->neg_classes != NULL) + { + for (i = 0; p1->neg_classes[i] != (tre_ctype_t)0; i++); + trans->neg_classes = + xmalloc(sizeof(*trans->neg_classes) * (i + 1)); + if (trans->neg_classes == NULL) + return REG_ESPACE; + for (i = 0; p1->neg_classes[i] != (tre_ctype_t)0; i++) + trans->neg_classes[i] = p1->neg_classes[i]; + trans->neg_classes[i] = (tre_ctype_t)0; + } + else + trans->neg_classes = NULL; + + /* Find out how many tags this transition has. */ + i = 0; + if (p1->tags != NULL) + while(p1->tags[i] >= 0) + i++; + j = 0; + if (p2->tags != NULL) + while(p2->tags[j] >= 0) + j++; + + /* If we are overwriting a transition, free the old tag array. */ + if (trans->tags != NULL) + xfree(trans->tags); + trans->tags = NULL; + + /* If there were any tags, allocate an array and fill it. */ + if (i + j > 0) + { + trans->tags = xmalloc(sizeof(*trans->tags) * (i + j + 1)); + if (!trans->tags) + return REG_ESPACE; + i = 0; + if (p1->tags != NULL) + while(p1->tags[i] >= 0) + { + trans->tags[i] = p1->tags[i]; + i++; + } + l = i; + j = 0; + if (p2->tags != NULL) + while (p2->tags[j] >= 0) + { + /* Don't add duplicates. */ + dup = 0; + for (k = 0; k < i; k++) + if (trans->tags[k] == p2->tags[j]) + { + dup = 1; + break; + } + if (!dup) + trans->tags[l++] = p2->tags[j]; + j++; + } + trans->tags[l] = -1; + } + + +#ifdef TRE_DEBUG + { + int *tags; + + DPRINT((" %2d -> %2d on %3d", p1->position, p2->position, + p1->code_min)); + if (p1->code_max != p1->code_min) + DPRINT(("-%3d", p1->code_max)); + tags = trans->tags; + if (tags) + { + DPRINT((", tags [")); + while (*tags >= 0) + { + DPRINT(("%d", *tags)); + tags++; + if (*tags >= 0) + DPRINT((",")); + } + DPRINT(("]")); + } + if (trans->assertions) + DPRINT((", assert %d", trans->assertions)); + if (trans->assertions & ASSERT_BACKREF) + DPRINT((", backref %d", trans->u.backref)); + else if (trans->class) + DPRINT((", class %ld", (long)trans->class)); + if (trans->neg_classes) + DPRINT((", neg_classes %p", trans->neg_classes)); + DPRINT(("\n")); + } +#endif /* TRE_DEBUG */ + p2++; + } + p1++; + } + else + /* Compute a maximum limit for the number of transitions leaving + from each state. */ + while (p1->position >= 0) + { + p2 = orig_p2; + while (p2->position >= 0) + { + counts[p1->position]++; + p2++; + } + p1++; + } + return REG_OK; +} + +/* Converts the syntax tree to a TNFA. All the transitions in the TNFA are + labelled with one character range (there are no transitions on empty + strings). The TNFA takes O(n^2) space in the worst case, `n' is size of + the regexp. */ +static reg_errcode_t +tre_ast_to_tnfa(tre_ast_node_t *node, tre_tnfa_transition_t *transitions, + int *counts, int *offs) +{ + tre_union_t *uni; + tre_catenation_t *cat; + tre_iteration_t *iter; + reg_errcode_t errcode = REG_OK; + + /* XXX - recurse using a stack!. */ + switch (node->type) + { + case LITERAL: + break; + case UNION: + uni = (tre_union_t *)node->obj; + errcode = tre_ast_to_tnfa(uni->left, transitions, counts, offs); + if (errcode != REG_OK) + return errcode; + errcode = tre_ast_to_tnfa(uni->right, transitions, counts, offs); + break; + + case CATENATION: + cat = (tre_catenation_t *)node->obj; + /* Add a transition from each position in cat->left->lastpos + to each position in cat->right->firstpos. */ + errcode = tre_make_trans(cat->left->lastpos, cat->right->firstpos, + transitions, counts, offs); + if (errcode != REG_OK) + return errcode; + errcode = tre_ast_to_tnfa(cat->left, transitions, counts, offs); + if (errcode != REG_OK) + return errcode; + errcode = tre_ast_to_tnfa(cat->right, transitions, counts, offs); + break; + + case ITERATION: + iter = (tre_iteration_t *)node->obj; + assert(iter->max == -1 || iter->max == 1); + + if (iter->max == -1) + { + assert(iter->min == 0 || iter->min == 1); + /* Add a transition from each last position in the iterated + expression to each first position. */ + errcode = tre_make_trans(iter->arg->lastpos, iter->arg->firstpos, + transitions, counts, offs); + if (errcode != REG_OK) + return errcode; + } + errcode = tre_ast_to_tnfa(iter->arg, transitions, counts, offs); + break; + } + return errcode; +} + + +static void +tre_free(regex_t *preg) +{ + tre_tnfa_t *tnfa; + unsigned int i; + tre_tnfa_transition_t *trans; + + tnfa = (void *)preg->TRE_REGEX_T_FIELD; + if (!tnfa) + return; + + for (i = 0; i < tnfa->num_transitions; i++) + if (tnfa->transitions[i].state) + { + if (tnfa->transitions[i].tags) + xfree(tnfa->transitions[i].tags); + if (tnfa->transitions[i].neg_classes) + xfree(tnfa->transitions[i].neg_classes); + } + if (tnfa->transitions) + xfree(tnfa->transitions); + + if (tnfa->initial) + { + for (trans = tnfa->initial; trans->state; trans++) + { + if (trans->tags) + xfree(trans->tags); + } + xfree(tnfa->initial); + } + + if (tnfa->submatch_data) + { + for (i = 0; i < tnfa->num_submatches; i++) + if (tnfa->submatch_data[i].parents) + xfree(tnfa->submatch_data[i].parents); + xfree(tnfa->submatch_data); + } + + if (tnfa->tag_directions) + xfree(tnfa->tag_directions); + xfree(tnfa); +} + + +#define ERROR_EXIT(err) \ + do \ + { \ + errcode = err; \ + if (1) goto error_exit; \ + } \ + while (0) + + +static int +tre_compile(regex_t *preg, const tre_char_t *regex, size_t n, int cflags) +{ + tre_stack_t *stack; + tre_ast_node_t *tree, *tmp_ast_l, *tmp_ast_r; + tre_pos_and_tags_t *p; + int *counts = NULL, *offs = NULL; + int i, add = 0; + tre_tnfa_transition_t *transitions, *initial; + tre_tnfa_t *tnfa = NULL; + tre_submatch_data_t *submatch_data; + tre_tag_direction_t *tag_directions = NULL; + reg_errcode_t errcode; + tre_mem_t mem; + + /* Parse context. */ + tre_parse_ctx_t parse_ctx; + + /* Allocate a stack used throughout the compilation process for various + purposes. */ + stack = tre_stack_new(512, 10240, 128); + if (!stack) + return REG_ESPACE; + /* Allocate a fast memory allocator. */ + mem = tre_mem_new(); + if (!mem) + { + tre_stack_destroy(stack); + return REG_ESPACE; + } + + /* Parse the regexp. */ + memset(&parse_ctx, 0, sizeof(parse_ctx)); + parse_ctx.mem = mem; + parse_ctx.stack = stack; + parse_ctx.re = regex; + parse_ctx.len = n; + parse_ctx.cflags = cflags; + parse_ctx.max_backref = -1; + DPRINT(("tre_compile: parsing '%.*" STRF "'\n", n, regex)); + errcode = tre_parse(&parse_ctx); + if (errcode != REG_OK) + ERROR_EXIT(errcode); + preg->re_nsub = parse_ctx.submatch_id - 1; + tree = parse_ctx.result; + +#ifdef TRE_DEBUG + tre_ast_print(tree); +#endif /* TRE_DEBUG */ + + /* Referring to nonexistent subexpressions is illegal. */ + if (parse_ctx.max_backref > (int)preg->re_nsub) + ERROR_EXIT(REG_ESUBREG); + + /* Allocate the TNFA struct. */ + tnfa = xcalloc(1, sizeof(tre_tnfa_t)); + if (tnfa == NULL) + ERROR_EXIT(REG_ESPACE); + tnfa->have_backrefs = parse_ctx.max_backref >= 0; + tnfa->num_submatches = parse_ctx.submatch_id; + + /* Set up tags for submatch addressing. If REG_NOSUB is set and the + regexp does not have back references, this can be skipped. */ + if (tnfa->have_backrefs || !(cflags & REG_NOSUB)) + { + DPRINT(("tre_compile: setting up tags\n")); + + /* Figure out how many tags we will need. */ + errcode = tre_add_tags(NULL, stack, tree, tnfa); + if (errcode != REG_OK) + ERROR_EXIT(errcode); +#ifdef TRE_DEBUG + tre_ast_print(tree); +#endif /* TRE_DEBUG */ + + if (tnfa->num_tags > 0) + { + tag_directions = xmalloc(sizeof(*tag_directions) + * (tnfa->num_tags + 1)); + if (tag_directions == NULL) + ERROR_EXIT(REG_ESPACE); + tnfa->tag_directions = tag_directions; + memset(tag_directions, -1, + sizeof(*tag_directions) * (tnfa->num_tags + 1)); + } + + submatch_data = xcalloc(parse_ctx.submatch_id, sizeof(*submatch_data)); + if (submatch_data == NULL) + ERROR_EXIT(REG_ESPACE); + tnfa->submatch_data = submatch_data; + + errcode = tre_add_tags(mem, stack, tree, tnfa); + if (errcode != REG_OK) + ERROR_EXIT(errcode); + +#ifdef TRE_DEBUG + for (i = 0; i < parse_ctx.submatch_id; i++) + DPRINT(("pmatch[%d] = {t%d, t%d}\n", + i, submatch_data[i].so_tag, submatch_data[i].eo_tag)); + for (i = 0; i < tnfa->num_tags; i++) + DPRINT(("t%d is %s\n", i, + tag_directions[i] == TRE_TAG_MINIMIZE ? + "minimized" : "maximized")); +#endif /* TRE_DEBUG */ + } + + /* Expand iteration nodes. */ + errcode = tre_expand_ast(mem, stack, tree, &parse_ctx.position, + tag_directions, NULL); + if (errcode != REG_OK) + ERROR_EXIT(errcode); + + /* Add a dummy node for the final state. + XXX - For certain patterns this dummy node can be optimized away, + for example "a*" or "ab*". Figure out a simple way to detect + this possibility. */ + tmp_ast_l = tree; + tmp_ast_r = tre_ast_new_literal(mem, 0, 0, parse_ctx.position++); + if (tmp_ast_r == NULL) + ERROR_EXIT(REG_ESPACE); + + tree = tre_ast_new_catenation(mem, tmp_ast_l, tmp_ast_r); + if (tree == NULL) + ERROR_EXIT(REG_ESPACE); + +#ifdef TRE_DEBUG + tre_ast_print(tree); + DPRINT(("Number of states: %d\n", parse_ctx.position)); +#endif /* TRE_DEBUG */ + + errcode = tre_compute_nfl(mem, stack, tree); + if (errcode != REG_OK) + ERROR_EXIT(errcode); + + counts = xmalloc(sizeof(int) * parse_ctx.position); + if (counts == NULL) + ERROR_EXIT(REG_ESPACE); + + offs = xmalloc(sizeof(int) * parse_ctx.position); + if (offs == NULL) + ERROR_EXIT(REG_ESPACE); + + for (i = 0; i < parse_ctx.position; i++) + counts[i] = 0; + tre_ast_to_tnfa(tree, NULL, counts, NULL); + + add = 0; + for (i = 0; i < parse_ctx.position; i++) + { + offs[i] = add; + add += counts[i] + 1; + counts[i] = 0; + } + transitions = xcalloc(add + 1, sizeof(*transitions)); + if (transitions == NULL) + ERROR_EXIT(REG_ESPACE); + tnfa->transitions = transitions; + tnfa->num_transitions = add; + + DPRINT(("Converting to TNFA:\n")); + errcode = tre_ast_to_tnfa(tree, transitions, counts, offs); + if (errcode != REG_OK) + ERROR_EXIT(errcode); + + p = tree->firstpos; + i = 0; + while (p->position >= 0) + { + i++; + +#ifdef TRE_DEBUG + { + int *tags; + DPRINT(("initial: %d", p->position)); + tags = p->tags; + if (tags != NULL) + { + if (*tags >= 0) + DPRINT(("/")); + while (*tags >= 0) + { + DPRINT(("%d", *tags)); + tags++; + if (*tags >= 0) + DPRINT((",")); + } + } + DPRINT((", assert %d", p->assertions)); + DPRINT(("\n")); + } +#endif /* TRE_DEBUG */ + + p++; + } + + initial = xcalloc(i + 1, sizeof(tre_tnfa_transition_t)); + if (initial == NULL) + ERROR_EXIT(REG_ESPACE); + tnfa->initial = initial; + + i = 0; + for (p = tree->firstpos; p->position >= 0; p++) + { + initial[i].state = transitions + offs[p->position]; + initial[i].state_id = p->position; + initial[i].tags = NULL; + /* Copy the arrays p->tags, they are allocated + from a tre_mem object. */ + if (p->tags) + { + int j; + for (j = 0; p->tags[j] >= 0; j++); + initial[i].tags = xmalloc(sizeof(*p->tags) * (j + 1)); + if (!initial[i].tags) + ERROR_EXIT(REG_ESPACE); + memcpy(initial[i].tags, p->tags, sizeof(*p->tags) * (j + 1)); + } + initial[i].assertions = p->assertions; + i++; + } + initial[i].state = NULL; + + tnfa->num_transitions = add; + tnfa->final = transitions + offs[tree->lastpos[0].position]; + tnfa->num_states = parse_ctx.position; + tnfa->cflags = cflags; + + DPRINT(("final state %p\n", (void *)tnfa->final)); + + tre_mem_destroy(mem); + tre_stack_destroy(stack); + xfree(counts); + xfree(offs); + + preg->TRE_REGEX_T_FIELD = (void *)tnfa; + return REG_OK; + + error_exit: + /* Free everything that was allocated and return the error code. */ + tre_mem_destroy(mem); + if (stack != NULL) + tre_stack_destroy(stack); + if (counts != NULL) + xfree(counts); + if (offs != NULL) + xfree(offs); + preg->TRE_REGEX_T_FIELD = (void *)tnfa; + tre_free(preg); + return errcode; +} + + +/*********************************************************************** + from regcomp.c +***********************************************************************/ + +int +regcomp(regex_t *preg, const char *regex, int cflags) +{ + int ret; + tre_char_t *wregex; + size_t n = strlen(regex); + + if (n+1 > SIZE_MAX/sizeof(tre_char_t)) + return REG_ESPACE; + wregex = xmalloc(sizeof(tre_char_t) * (n + 1)); + if (wregex == NULL) + return REG_ESPACE; + + n = mbstowcs(wregex, regex, n+1); + if (n == (size_t)-1) { + xfree(wregex); + return REG_BADPAT; + } + + ret = tre_compile(preg, wregex, n, cflags); + xfree(wregex); + + return ret; +} + +void +regfree(regex_t *preg) +{ + tre_free(preg); +} + +/* EOF */ diff --git a/src/regex/regerror.c b/src/regex/regerror.c new file mode 100644 index 00000000..39d70b2a --- /dev/null +++ b/src/regex/regerror.c @@ -0,0 +1,75 @@ +/* + regerror.c - POSIX regerror() implementation for TRE. + + Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + +*/ + +#include <string.h> +#include <regex.h> + +/* Error message strings for error codes listed in `regex.h'. This list + needs to be in sync with the codes listed there, naturally. */ + +/* Converted to single string by Rich Felker to remove the need for + * data relocations at runtime, 27 Feb 2006. */ + +static const char tre_error_messages[] = { + "No error\0" + "No match\0" + "Invalid regexp\0" + "Unknown collating element\0" + "Unknown character class name\0" + "Trailing backslash\0" + "Invalid back reference\0" + "Missing ']'\0" + "Missing ')'\0" + "Missing '}'\0" + "Invalid contents of {}\0" + "Invalid character range\0" + "Out of memory\0" + "XXX\0" +}; + +size_t +regerror(int errcode, const regex_t *preg, char *errbuf, size_t errbuf_size) +{ + const char *err; + size_t err_len; + + if (errcode >= 0 && errcode <= REG_BADRPT) + for (err=tre_error_messages; errcode; errcode--, err+=strlen(err)+1); + else + err = "Unknown error"; + + err_len = strlen(err) + 1; + if (errbuf_size > 0 && errbuf != NULL) + { + if (err_len > errbuf_size) + { + memcpy(errbuf, err, errbuf_size - 1); + errbuf[errbuf_size - 1] = '\0'; + } + else + { + strcpy(errbuf, err); + } + } + return err_len; +} + +/* EOF */ diff --git a/src/regex/regexec.c b/src/regex/regexec.c new file mode 100644 index 00000000..0c3d2834 --- /dev/null +++ b/src/regex/regexec.c @@ -0,0 +1,1107 @@ +/* + regexec.c - TRE POSIX compatible matching functions (and more). + + Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + +*/ + +#include <stdlib.h> +#include <string.h> +#include <wchar.h> +#include <wctype.h> +#include <limits.h> + +#include <regex.h> + +#include "tre.h" + +#include <assert.h> + +static void +tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags, + const tre_tnfa_t *tnfa, int *tags, int match_eo); + +/*********************************************************************** + from tre-match-utils.h +***********************************************************************/ + +#define GET_NEXT_WCHAR() do { \ + prev_c = next_c; pos += pos_add_next; \ + if ((pos_add_next = mbtowc(&next_c, str_byte, MB_LEN_MAX)) <= 0) { \ + if (pos_add_next < 0) return REG_NOMATCH; \ + else pos_add_next++; \ + } \ + str_byte += pos_add_next; \ + } while (0) + +#define CHECK_ASSERTIONS(assertions) \ + (((assertions & ASSERT_AT_BOL) \ + && (pos > 0 || reg_notbol) \ + && (prev_c != L'\n' || !reg_newline)) \ + || ((assertions & ASSERT_AT_EOL) \ + && (next_c != L'\0' || reg_noteol) \ + && (next_c != L'\n' || !reg_newline))) + +/* Returns 1 if `t1' wins `t2', 0 otherwise. */ +static int +tre_tag_order(int num_tags, tre_tag_direction_t *tag_directions, + int *t1, int *t2) +{ + int i; + for (i = 0; i < num_tags; i++) + { + if (tag_directions[i] == TRE_TAG_MINIMIZE) + { + if (t1[i] < t2[i]) + return 1; + if (t1[i] > t2[i]) + return 0; + } + else + { + if (t1[i] > t2[i]) + return 1; + if (t1[i] < t2[i]) + return 0; + } + } + /* assert(0);*/ + return 0; +} + +static int +tre_neg_char_classes_match(tre_ctype_t *classes, tre_cint_t wc, int icase) +{ + DPRINT(("neg_char_classes_test: %p, %d, %d\n", classes, wc, icase)); + while (*classes != (tre_ctype_t)0) + if ((!icase && tre_isctype(wc, *classes)) + || (icase && (tre_isctype(tre_toupper(wc), *classes) + || tre_isctype(tre_tolower(wc), *classes)))) + return 1; /* Match. */ + else + classes++; + return 0; /* No match. */ +} + + +/*********************************************************************** + from tre-match-parallel.c +***********************************************************************/ + +/* + This algorithm searches for matches basically by reading characters + in the searched string one by one, starting at the beginning. All + matching paths in the TNFA are traversed in parallel. When two or + more paths reach the same state, exactly one is chosen according to + tag ordering rules; if returning submatches is not required it does + not matter which path is chosen. + + The worst case time required for finding the leftmost and longest + match, or determining that there is no match, is always linearly + dependent on the length of the text being searched. + + This algorithm cannot handle TNFAs with back referencing nodes. + See `tre-match-backtrack.c'. +*/ + + +typedef struct { + tre_tnfa_transition_t *state; + int *tags; +} tre_tnfa_reach_t; + +typedef struct { + int pos; + int **tags; +} tre_reach_pos_t; + + +#ifdef TRE_DEBUG +static void +tre_print_reach(const tre_tnfa_t *tnfa, tre_tnfa_reach_t *reach, int num_tags) +{ + int i; + + while (reach->state != NULL) + { + DPRINT((" %p", (void *)reach->state)); + if (num_tags > 0) + { + DPRINT(("/")); + for (i = 0; i < num_tags; i++) + { + DPRINT(("%d:%d", i, reach->tags[i])); + if (i < (num_tags-1)) + DPRINT((",")); + } + } + reach++; + } + DPRINT(("\n")); + +} +#endif /* TRE_DEBUG */ + +static reg_errcode_t +tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len, + int *match_tags, int eflags, int *match_end_ofs) +{ + /* State variables required by GET_NEXT_WCHAR. */ + tre_char_t prev_c = 0, next_c = 0; + const char *str_byte = string; + int pos = -1; + int pos_add_next = 1; +#ifdef TRE_MBSTATE + mbstate_t mbstate; +#endif /* TRE_MBSTATE */ + int reg_notbol = eflags & REG_NOTBOL; + int reg_noteol = eflags & REG_NOTEOL; + int reg_newline = tnfa->cflags & REG_NEWLINE; + + char *buf; + tre_tnfa_transition_t *trans_i; + tre_tnfa_reach_t *reach, *reach_next, *reach_i, *reach_next_i; + tre_reach_pos_t *reach_pos; + int *tag_i; + int num_tags, i; + + int match_eo = -1; /* end offset of match (-1 if no match found yet) */ + int new_match = 0; + int *tmp_tags = NULL; + int *tmp_iptr; + +#ifdef TRE_MBSTATE + memset(&mbstate, '\0', sizeof(mbstate)); +#endif /* TRE_MBSTATE */ + + if (!match_tags) + num_tags = 0; + else + num_tags = tnfa->num_tags; + + /* Allocate memory for temporary data required for matching. This needs to + be done for every matching operation to be thread safe. This allocates + everything in a single large block from the stack frame using alloca() + or with malloc() if alloca is unavailable. */ + { + int tbytes, rbytes, pbytes, xbytes, total_bytes; + char *tmp_buf; + /* Compute the length of the block we need. */ + tbytes = sizeof(*tmp_tags) * num_tags; + rbytes = sizeof(*reach_next) * (tnfa->num_states + 1); + pbytes = sizeof(*reach_pos) * tnfa->num_states; + xbytes = sizeof(int) * num_tags; + total_bytes = + (sizeof(long) - 1) * 4 /* for alignment paddings */ + + (rbytes + xbytes * tnfa->num_states) * 2 + tbytes + pbytes; + + /* Allocate the memory. */ +#ifdef TRE_USE_ALLOCA + buf = alloca(total_bytes); +#else /* !TRE_USE_ALLOCA */ + buf = xmalloc(total_bytes); +#endif /* !TRE_USE_ALLOCA */ + if (buf == NULL) + return REG_ESPACE; + memset(buf, 0, total_bytes); + + /* Get the various pointers within tmp_buf (properly aligned). */ + tmp_tags = (void *)buf; + tmp_buf = buf + tbytes; + tmp_buf += ALIGN(tmp_buf, long); + reach_next = (void *)tmp_buf; + tmp_buf += rbytes; + tmp_buf += ALIGN(tmp_buf, long); + reach = (void *)tmp_buf; + tmp_buf += rbytes; + tmp_buf += ALIGN(tmp_buf, long); + reach_pos = (void *)tmp_buf; + tmp_buf += pbytes; + tmp_buf += ALIGN(tmp_buf, long); + for (i = 0; i < tnfa->num_states; i++) + { + reach[i].tags = (void *)tmp_buf; + tmp_buf += xbytes; + reach_next[i].tags = (void *)tmp_buf; + tmp_buf += xbytes; + } + } + + for (i = 0; i < tnfa->num_states; i++) + reach_pos[i].pos = -1; + + GET_NEXT_WCHAR(); + pos = 0; + + DPRINT(("length: %d\n", len)); + DPRINT(("pos:chr/code | states and tags\n")); + DPRINT(("-------------+------------------------------------------------\n")); + + reach_next_i = reach_next; + while (1) + { + /* If no match found yet, add the initial states to `reach_next'. */ + if (match_eo < 0) + { + DPRINT((" init >")); + trans_i = tnfa->initial; + while (trans_i->state != NULL) + { + if (reach_pos[trans_i->state_id].pos < pos) + { + if (trans_i->assertions + && CHECK_ASSERTIONS(trans_i->assertions)) + { + DPRINT(("assertion failed\n")); + trans_i++; + continue; + } + + DPRINT((" %p", (void *)trans_i->state)); + reach_next_i->state = trans_i->state; + for (i = 0; i < num_tags; i++) + reach_next_i->tags[i] = -1; + tag_i = trans_i->tags; + if (tag_i) + while (*tag_i >= 0) + { + if (*tag_i < num_tags) + reach_next_i->tags[*tag_i] = pos; + tag_i++; + } + if (reach_next_i->state == tnfa->final) + { + DPRINT((" found empty match\n")); + match_eo = pos; + new_match = 1; + for (i = 0; i < num_tags; i++) + match_tags[i] = reach_next_i->tags[i]; + } + reach_pos[trans_i->state_id].pos = pos; + reach_pos[trans_i->state_id].tags = &reach_next_i->tags; + reach_next_i++; + } + trans_i++; + } + DPRINT(("\n")); + reach_next_i->state = NULL; + } + else + { + if (num_tags == 0 || reach_next_i == reach_next) + /* We have found a match. */ + break; + } + + /* Check for end of string. */ + if (!next_c) break; + + GET_NEXT_WCHAR(); + +#ifdef TRE_DEBUG + DPRINT(("%3d:%2lc/%05d |", pos - 1, (tre_cint_t)prev_c, (int)prev_c)); + tre_print_reach(tnfa, reach_next, num_tags); + DPRINT(("%3d:%2lc/%05d |", pos, (tre_cint_t)next_c, (int)next_c)); + tre_print_reach(tnfa, reach_next, num_tags); +#endif /* TRE_DEBUG */ + + /* Swap `reach' and `reach_next'. */ + reach_i = reach; + reach = reach_next; + reach_next = reach_i; + + /* For each state in `reach' see if there is a transition leaving with + the current input symbol to a state not yet in `reach_next', and + add the destination states to `reach_next'. */ + reach_next_i = reach_next; + for (reach_i = reach; reach_i->state; reach_i++) + { + for (trans_i = reach_i->state; trans_i->state; trans_i++) + { + /* Does this transition match the input symbol? */ + if (trans_i->code_min <= prev_c && + trans_i->code_max >= prev_c) + { + if (trans_i->assertions + && (CHECK_ASSERTIONS(trans_i->assertions) + /* Handle character class transitions. */ + || ((trans_i->assertions & ASSERT_CHAR_CLASS) + && !(tnfa->cflags & REG_ICASE) + && !tre_isctype((tre_cint_t)prev_c, + trans_i->u.class)) + || ((trans_i->assertions & ASSERT_CHAR_CLASS) + && (tnfa->cflags & REG_ICASE) + && (!tre_isctype(tre_tolower((tre_cint_t)prev_c), + trans_i->u.class) + && !tre_isctype(tre_toupper((tre_cint_t)prev_c), + trans_i->u.class))) + || ((trans_i->assertions & ASSERT_CHAR_CLASS_NEG) + && tre_neg_char_classes_match(trans_i->neg_classes, + (tre_cint_t)prev_c, + tnfa->cflags & REG_ICASE)))) + { + DPRINT(("assertion failed\n")); + continue; + } + + /* Compute the tags after this transition. */ + for (i = 0; i < num_tags; i++) + tmp_tags[i] = reach_i->tags[i]; + tag_i = trans_i->tags; + if (tag_i != NULL) + while (*tag_i >= 0) + { + if (*tag_i < num_tags) + tmp_tags[*tag_i] = pos; + tag_i++; + } + + if (reach_pos[trans_i->state_id].pos < pos) + { + /* Found an unvisited node. */ + reach_next_i->state = trans_i->state; + tmp_iptr = reach_next_i->tags; + reach_next_i->tags = tmp_tags; + tmp_tags = tmp_iptr; + reach_pos[trans_i->state_id].pos = pos; + reach_pos[trans_i->state_id].tags = &reach_next_i->tags; + + if (reach_next_i->state == tnfa->final + && (match_eo == -1 + || (num_tags > 0 + && reach_next_i->tags[0] <= match_tags[0]))) + { + DPRINT((" found match %p\n", trans_i->state)); + match_eo = pos; + new_match = 1; + for (i = 0; i < num_tags; i++) + match_tags[i] = reach_next_i->tags[i]; + } + reach_next_i++; + + } + else + { + assert(reach_pos[trans_i->state_id].pos == pos); + /* Another path has also reached this state. We choose + the winner by examining the tag values for both + paths. */ + if (tre_tag_order(num_tags, tnfa->tag_directions, + tmp_tags, + *reach_pos[trans_i->state_id].tags)) + { + /* The new path wins. */ + tmp_iptr = *reach_pos[trans_i->state_id].tags; + *reach_pos[trans_i->state_id].tags = tmp_tags; + if (trans_i->state == tnfa->final) + { + DPRINT((" found better match\n")); + match_eo = pos; + new_match = 1; + for (i = 0; i < num_tags; i++) + match_tags[i] = tmp_tags[i]; + } + tmp_tags = tmp_iptr; + } + } + } + } + } + reach_next_i->state = NULL; + } + + DPRINT(("match end offset = %d\n", match_eo)); + +#ifndef TRE_USE_ALLOCA + if (buf) + xfree(buf); +#endif /* !TRE_USE_ALLOCA */ + + *match_end_ofs = match_eo; + return match_eo >= 0 ? REG_OK : REG_NOMATCH; +} + + +/*********************************************************************** + from tre-match-backtrack.c +***********************************************************************/ + +/* + This matcher is for regexps that use back referencing. Regexp matching + with back referencing is an NP-complete problem on the number of back + references. The easiest way to match them is to use a backtracking + routine which basically goes through all possible paths in the TNFA + and chooses the one which results in the best (leftmost and longest) + match. This can be spectacularly expensive and may run out of stack + space, but there really is no better known generic algorithm. Quoting + Henry Spencer from comp.compilers: + <URL: http://compilers.iecc.com/comparch/article/93-03-102> + + POSIX.2 REs require longest match, which is really exciting to + implement since the obsolete ("basic") variant also includes + \<digit>. I haven't found a better way of tackling this than doing + a preliminary match using a DFA (or simulation) on a modified RE + that just replicates subREs for \<digit>, and then doing a + backtracking match to determine whether the subRE matches were + right. This can be rather slow, but I console myself with the + thought that people who use \<digit> deserve very slow execution. + (Pun unintentional but very appropriate.) + +*/ + +typedef struct { + int pos; + const char *str_byte; + tre_tnfa_transition_t *state; + int state_id; + int next_c; + int *tags; +#ifdef TRE_MBSTATE + mbstate_t mbstate; +#endif /* TRE_MBSTATE */ +} tre_backtrack_item_t; + +typedef struct tre_backtrack_struct { + tre_backtrack_item_t item; + struct tre_backtrack_struct *prev; + struct tre_backtrack_struct *next; +} *tre_backtrack_t; + +#ifdef TRE_MBSTATE +#define BT_STACK_MBSTATE_IN stack->item.mbstate = (mbstate) +#define BT_STACK_MBSTATE_OUT (mbstate) = stack->item.mbstate +#else /* !TRE_MBSTATE */ +#define BT_STACK_MBSTATE_IN +#define BT_STACK_MBSTATE_OUT +#endif /* !TRE_MBSTATE */ + + +#ifdef TRE_USE_ALLOCA +#define tre_bt_mem_new tre_mem_newa +#define tre_bt_mem_alloc tre_mem_alloca +#define tre_bt_mem_destroy(obj) do { } while (0) +#else /* !TRE_USE_ALLOCA */ +#define tre_bt_mem_new tre_mem_new +#define tre_bt_mem_alloc tre_mem_alloc +#define tre_bt_mem_destroy tre_mem_destroy +#endif /* !TRE_USE_ALLOCA */ + + +#define BT_STACK_PUSH(_pos, _str_byte, _str_wide, _state, _state_id, _next_c, _tags, _mbstate) \ + do \ + { \ + int i; \ + if (!stack->next) \ + { \ + tre_backtrack_t s; \ + s = tre_bt_mem_alloc(mem, sizeof(*s)); \ + if (!s) \ + { \ + tre_bt_mem_destroy(mem); \ + if (tags) \ + xfree(tags); \ + if (pmatch) \ + xfree(pmatch); \ + if (states_seen) \ + xfree(states_seen); \ + return REG_ESPACE; \ + } \ + s->prev = stack; \ + s->next = NULL; \ + s->item.tags = tre_bt_mem_alloc(mem, \ + sizeof(*tags) * tnfa->num_tags); \ + if (!s->item.tags) \ + { \ + tre_bt_mem_destroy(mem); \ + if (tags) \ + xfree(tags); \ + if (pmatch) \ + xfree(pmatch); \ + if (states_seen) \ + xfree(states_seen); \ + return REG_ESPACE; \ + } \ + stack->next = s; \ + stack = s; \ + } \ + else \ + stack = stack->next; \ + stack->item.pos = (_pos); \ + stack->item.str_byte = (_str_byte); \ + stack->item.state = (_state); \ + stack->item.state_id = (_state_id); \ + stack->item.next_c = (_next_c); \ + for (i = 0; i < tnfa->num_tags; i++) \ + stack->item.tags[i] = (_tags)[i]; \ + BT_STACK_MBSTATE_IN; \ + } \ + while (0) + +#define BT_STACK_POP() \ + do \ + { \ + int i; \ + assert(stack->prev); \ + pos = stack->item.pos; \ + str_byte = stack->item.str_byte; \ + state = stack->item.state; \ + next_c = stack->item.next_c; \ + for (i = 0; i < tnfa->num_tags; i++) \ + tags[i] = stack->item.tags[i]; \ + BT_STACK_MBSTATE_OUT; \ + stack = stack->prev; \ + } \ + while (0) + +#undef MIN +#define MIN(a, b) ((a) <= (b) ? (a) : (b)) + +static reg_errcode_t +tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string, + int len, int *match_tags, + int eflags, int *match_end_ofs) +{ + /* State variables required by GET_NEXT_WCHAR. */ + tre_char_t prev_c = 0, next_c = 0; + const char *str_byte = string; + int pos = 0; + int pos_add_next = 1; +#ifdef TRE_MBSTATE + mbstate_t mbstate; +#endif /* TRE_MBSTATE */ + int reg_notbol = eflags & REG_NOTBOL; + int reg_noteol = eflags & REG_NOTEOL; + int reg_newline = tnfa->cflags & REG_NEWLINE; + + /* These are used to remember the necessary values of the above + variables to return to the position where the current search + started from. */ + int next_c_start; + const char *str_byte_start; + int pos_start = -1; +#ifdef TRE_MBSTATE + mbstate_t mbstate_start; +#endif /* TRE_MBSTATE */ + + /* Compilation flags for this regexp. */ + int cflags = tnfa->cflags; + + /* End offset of best match so far, or -1 if no match found yet. */ + int match_eo = -1; + /* Tag arrays. */ + int *next_tags, *tags = NULL; + /* Current TNFA state. */ + tre_tnfa_transition_t *state; + int *states_seen = NULL; + + /* Memory allocator to for allocating the backtracking stack. */ + tre_mem_t mem = tre_bt_mem_new(); + + /* The backtracking stack. */ + tre_backtrack_t stack; + + tre_tnfa_transition_t *trans_i; + regmatch_t *pmatch = NULL; + int ret; + +#ifdef TRE_MBSTATE + memset(&mbstate, '\0', sizeof(mbstate)); +#endif /* TRE_MBSTATE */ + + if (!mem) + return REG_ESPACE; + stack = tre_bt_mem_alloc(mem, sizeof(*stack)); + if (!stack) + { + ret = REG_ESPACE; + goto error_exit; + } + stack->prev = NULL; + stack->next = NULL; + +#ifdef TRE_USE_ALLOCA + tags = alloca(sizeof(*tags) * tnfa->num_tags); + pmatch = alloca(sizeof(*pmatch) * tnfa->num_submatches); + states_seen = alloca(sizeof(*states_seen) * tnfa->num_states); +#else /* !TRE_USE_ALLOCA */ + tags = xmalloc(sizeof(*tags) * tnfa->num_tags); + if (!tags) + { + ret = REG_ESPACE; + goto error_exit; + } + pmatch = xmalloc(sizeof(*pmatch) * tnfa->num_submatches); + if (!pmatch) + { + ret = REG_ESPACE; + goto error_exit; + } + states_seen = xmalloc(sizeof(*states_seen) * tnfa->num_states); + if (!states_seen) + { + ret = REG_ESPACE; + goto error_exit; + } +#endif /* !TRE_USE_ALLOCA */ + + retry: + { + int i; + for (i = 0; i < tnfa->num_tags; i++) + { + tags[i] = -1; + if (match_tags) + match_tags[i] = -1; + } + for (i = 0; i < tnfa->num_states; i++) + states_seen[i] = 0; + } + + state = NULL; + pos = pos_start; + GET_NEXT_WCHAR(); + pos_start = pos; + next_c_start = next_c; + str_byte_start = str_byte; +#ifdef TRE_MBSTATE + mbstate_start = mbstate; +#endif /* TRE_MBSTATE */ + + /* Handle initial states. */ + next_tags = NULL; + for (trans_i = tnfa->initial; trans_i->state; trans_i++) + { + DPRINT(("> init %p, prev_c %lc\n", trans_i->state, (tre_cint_t)prev_c)); + if (trans_i->assertions && CHECK_ASSERTIONS(trans_i->assertions)) + { + DPRINT(("assert failed\n")); + continue; + } + if (state == NULL) + { + /* Start from this state. */ + state = trans_i->state; + next_tags = trans_i->tags; + } + else + { + /* Backtrack to this state. */ + DPRINT(("saving state %d for backtracking\n", trans_i->state_id)); + BT_STACK_PUSH(pos, str_byte, str_wide, trans_i->state, + trans_i->state_id, next_c, tags, mbstate); + { + int *tmp = trans_i->tags; + if (tmp) + while (*tmp >= 0) + stack->item.tags[*tmp++] = pos; + } + } + } + + if (next_tags) + for (; *next_tags >= 0; next_tags++) + tags[*next_tags] = pos; + + + DPRINT(("entering match loop, pos %d, str_byte %p\n", pos, str_byte)); + DPRINT(("pos:chr/code | state and tags\n")); + DPRINT(("-------------+------------------------------------------------\n")); + + if (state == NULL) + goto backtrack; + + while (1) + { + tre_tnfa_transition_t *trans_i, *next_state; + int empty_br_match; + + DPRINT(("start loop\n")); + if (state == tnfa->final) + { + DPRINT((" match found, %d %d\n", match_eo, pos)); + if (match_eo < pos + || (match_eo == pos + && match_tags + && tre_tag_order(tnfa->num_tags, tnfa->tag_directions, + tags, match_tags))) + { + int i; + /* This match wins the previous match. */ + DPRINT((" win previous\n")); + match_eo = pos; + if (match_tags) + for (i = 0; i < tnfa->num_tags; i++) + match_tags[i] = tags[i]; + } + /* Our TNFAs never have transitions leaving from the final state, + so we jump right to backtracking. */ + goto backtrack; + } + +#ifdef TRE_DEBUG + DPRINT(("%3d:%2lc/%05d | %p ", pos, (tre_cint_t)next_c, (int)next_c, + state)); + { + int i; + for (i = 0; i < tnfa->num_tags; i++) + DPRINT(("%d%s", tags[i], i < tnfa->num_tags - 1 ? ", " : "")); + DPRINT(("\n")); + } +#endif /* TRE_DEBUG */ + + /* Go to the next character in the input string. */ + empty_br_match = 0; + trans_i = state; + if (trans_i->state && trans_i->assertions & ASSERT_BACKREF) + { + /* This is a back reference state. All transitions leaving from + this state have the same back reference "assertion". Instead + of reading the next character, we match the back reference. */ + int so, eo, bt = trans_i->u.backref; + int bt_len; + int result; + + DPRINT((" should match back reference %d\n", bt)); + /* Get the substring we need to match against. Remember to + turn off REG_NOSUB temporarily. */ + tre_fill_pmatch(bt + 1, pmatch, tnfa->cflags & !REG_NOSUB, + tnfa, tags, pos); + so = pmatch[bt].rm_so; + eo = pmatch[bt].rm_eo; + bt_len = eo - so; + + if (len < 0) + { + result = strncmp((char*)string + so, str_byte - 1, bt_len); + } + else if (len - pos < bt_len) + result = 1; + else + result = memcmp((char*)string + so, str_byte - 1, bt_len); + + /* We can ignore multibyte characters here because the backref + string is already aligned at character boundaries. */ + if (result == 0) + { + /* Back reference matched. Check for infinite loop. */ + if (bt_len == 0) + empty_br_match = 1; + if (empty_br_match && states_seen[trans_i->state_id]) + { + DPRINT((" avoid loop\n")); + goto backtrack; + } + + states_seen[trans_i->state_id] = empty_br_match; + + /* Advance in input string and resync `prev_c', `next_c' + and pos. */ + DPRINT((" back reference matched\n")); + str_byte += bt_len - 1; + pos += bt_len - 1; + GET_NEXT_WCHAR(); + DPRINT((" pos now %d\n", pos)); + } + else + { + DPRINT((" back reference did not match\n")); + goto backtrack; + } + } + else + { + /* Check for end of string. */ + if (len < 0) + { + if (next_c == L'\0') + goto backtrack; + } + else + { + if (pos >= len) + goto backtrack; + } + + /* Read the next character. */ + GET_NEXT_WCHAR(); + } + + next_state = NULL; + for (trans_i = state; trans_i->state; trans_i++) + { + DPRINT((" transition %d-%d (%c-%c) %d to %d\n", + trans_i->code_min, trans_i->code_max, + trans_i->code_min, trans_i->code_max, + trans_i->assertions, trans_i->state_id)); + if (trans_i->code_min <= prev_c && trans_i->code_max >= prev_c) + { + if (trans_i->assertions + && (CHECK_ASSERTIONS(trans_i->assertions) + /* Handle character class transitions. */ + || ((trans_i->assertions & ASSERT_CHAR_CLASS) + && !(cflags & REG_ICASE) + && !tre_isctype((tre_cint_t)prev_c, trans_i->u.class)) + || ((trans_i->assertions & ASSERT_CHAR_CLASS) + && (cflags & REG_ICASE) + && (!tre_isctype(tre_tolower((tre_cint_t)prev_c), + trans_i->u.class) + && !tre_isctype(tre_toupper((tre_cint_t)prev_c), + trans_i->u.class))) + || ((trans_i->assertions & ASSERT_CHAR_CLASS_NEG) + && tre_neg_char_classes_match(trans_i->neg_classes, + (tre_cint_t)prev_c, + cflags & REG_ICASE)))) + { + DPRINT((" assertion failed\n")); + continue; + } + + if (next_state == NULL) + { + /* First matching transition. */ + DPRINT((" Next state is %d\n", trans_i->state_id)); + next_state = trans_i->state; + next_tags = trans_i->tags; + } + else + { + /* Second mathing transition. We may need to backtrack here + to take this transition instead of the first one, so we + push this transition in the backtracking stack so we can + jump back here if needed. */ + DPRINT((" saving state %d for backtracking\n", + trans_i->state_id)); + BT_STACK_PUSH(pos, str_byte, str_wide, trans_i->state, + trans_i->state_id, next_c, tags, mbstate); + { + int *tmp; + for (tmp = trans_i->tags; tmp && *tmp >= 0; tmp++) + stack->item.tags[*tmp] = pos; + } +#if 0 /* XXX - it's important not to look at all transitions here to keep + the stack small! */ + break; +#endif + } + } + } + + if (next_state != NULL) + { + /* Matching transitions were found. Take the first one. */ + state = next_state; + + /* Update the tag values. */ + if (next_tags) + while (*next_tags >= 0) + tags[*next_tags++] = pos; + } + else + { + backtrack: + /* A matching transition was not found. Try to backtrack. */ + if (stack->prev) + { + DPRINT((" backtracking\n")); + if (stack->item.state->assertions && ASSERT_BACKREF) + { + DPRINT((" states_seen[%d] = 0\n", + stack->item.state_id)); + states_seen[stack->item.state_id] = 0; + } + + BT_STACK_POP(); + } + else if (match_eo < 0) + { + /* Try starting from a later position in the input string. */ + /* Check for end of string. */ + if (len < 0) + { + if (next_c == L'\0') + { + DPRINT(("end of string.\n")); + break; + } + } + else + { + if (pos >= len) + { + DPRINT(("end of string.\n")); + break; + } + } + DPRINT(("restarting from next start position\n")); + next_c = next_c_start; +#ifdef TRE_MBSTATE + mbstate = mbstate_start; +#endif /* TRE_MBSTATE */ + str_byte = str_byte_start; + goto retry; + } + else + { + DPRINT(("finished\n")); + break; + } + } + } + + ret = match_eo >= 0 ? REG_OK : REG_NOMATCH; + *match_end_ofs = match_eo; + + error_exit: + tre_bt_mem_destroy(mem); +#ifndef TRE_USE_ALLOCA + if (tags) + xfree(tags); + if (pmatch) + xfree(pmatch); + if (states_seen) + xfree(states_seen); +#endif /* !TRE_USE_ALLOCA */ + + return ret; +} + + +/*********************************************************************** + from regexec.c +***********************************************************************/ + +/* Fills the POSIX.2 regmatch_t array according to the TNFA tag and match + endpoint values. */ +static void +tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags, + const tre_tnfa_t *tnfa, int *tags, int match_eo) +{ + tre_submatch_data_t *submatch_data; + unsigned int i, j; + int *parents; + + i = 0; + if (match_eo >= 0 && !(cflags & REG_NOSUB)) + { + /* Construct submatch offsets from the tags. */ + DPRINT(("end tag = t%d = %d\n", tnfa->end_tag, match_eo)); + submatch_data = tnfa->submatch_data; + while (i < tnfa->num_submatches && i < nmatch) + { + if (submatch_data[i].so_tag == tnfa->end_tag) + pmatch[i].rm_so = match_eo; + else + pmatch[i].rm_so = tags[submatch_data[i].so_tag]; + + if (submatch_data[i].eo_tag == tnfa->end_tag) + pmatch[i].rm_eo = match_eo; + else + pmatch[i].rm_eo = tags[submatch_data[i].eo_tag]; + + /* If either of the endpoints were not used, this submatch + was not part of the match. */ + if (pmatch[i].rm_so == -1 || pmatch[i].rm_eo == -1) + pmatch[i].rm_so = pmatch[i].rm_eo = -1; + + DPRINT(("pmatch[%d] = {t%d = %d, t%d = %d}\n", i, + submatch_data[i].so_tag, pmatch[i].rm_so, + submatch_data[i].eo_tag, pmatch[i].rm_eo)); + i++; + } + /* Reset all submatches that are not within all of their parent + submatches. */ + i = 0; + while (i < tnfa->num_submatches && i < nmatch) + { + if (pmatch[i].rm_eo == -1) + assert(pmatch[i].rm_so == -1); + assert(pmatch[i].rm_so <= pmatch[i].rm_eo); + + parents = submatch_data[i].parents; + if (parents != NULL) + for (j = 0; parents[j] >= 0; j++) + { + DPRINT(("pmatch[%d] parent %d\n", i, parents[j])); + if (pmatch[i].rm_so < pmatch[parents[j]].rm_so + || pmatch[i].rm_eo > pmatch[parents[j]].rm_eo) + pmatch[i].rm_so = pmatch[i].rm_eo = -1; + } + i++; + } + } + + while (i < nmatch) + { + pmatch[i].rm_so = -1; + pmatch[i].rm_eo = -1; + i++; + } +} + + +/* + Wrapper functions for POSIX compatible regexp matching. +*/ + +static int +tre_match(const tre_tnfa_t *tnfa, const void *string, size_t len, + size_t nmatch, regmatch_t pmatch[], int eflags) +{ + reg_errcode_t status; + int *tags = NULL, eo; + if (tnfa->num_tags > 0 && nmatch > 0) + { +#ifdef TRE_USE_ALLOCA + tags = alloca(sizeof(*tags) * tnfa->num_tags); +#else /* !TRE_USE_ALLOCA */ + tags = xmalloc(sizeof(*tags) * tnfa->num_tags); +#endif /* !TRE_USE_ALLOCA */ + if (tags == NULL) + return REG_ESPACE; + } + + /* Dispatch to the appropriate matcher. */ + if (tnfa->have_backrefs) + { + /* The regex has back references, use the backtracking matcher. */ + status = tre_tnfa_run_backtrack(tnfa, string, len, tags, eflags, &eo); + } + else + { + /* Exact matching, no back references, use the parallel matcher. */ + status = tre_tnfa_run_parallel(tnfa, string, len, tags, eflags, &eo); + } + + if (status == REG_OK) + /* A match was found, so fill the submatch registers. */ + tre_fill_pmatch(nmatch, pmatch, tnfa->cflags, tnfa, tags, eo); +#ifndef TRE_USE_ALLOCA + if (tags) + xfree(tags); +#endif /* !TRE_USE_ALLOCA */ + return status; +} + +int +regexec(const regex_t *preg, const char *str, + size_t nmatch, regmatch_t pmatch[], int eflags) +{ + return tre_match((void *)preg->TRE_REGEX_T_FIELD, str, -1, + nmatch, pmatch, eflags); +} + +/* EOF */ diff --git a/src/regex/tre-mem.c b/src/regex/tre-mem.c new file mode 100644 index 00000000..d7bdd3db --- /dev/null +++ b/src/regex/tre-mem.c @@ -0,0 +1,163 @@ +/* + tre-mem.c - TRE memory allocator + + Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi> + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + +*/ + +/* + This memory allocator is for allocating small memory blocks efficiently + in terms of memory overhead and execution speed. The allocated blocks + cannot be freed individually, only all at once. There can be multiple + allocators, though. +*/ + +#include <stdlib.h> +#include <string.h> + +#include "tre.h" + + +/* Returns a new memory allocator or NULL if out of memory. */ +tre_mem_t +tre_mem_new_impl(int provided, void *provided_block) +{ + tre_mem_t mem; + if (provided) + { + mem = provided_block; + memset(mem, 0, sizeof(*mem)); + } + else + mem = xcalloc(1, sizeof(*mem)); + if (mem == NULL) + return NULL; + return mem; +} + + +/* Frees the memory allocator and all memory allocated with it. */ +void +tre_mem_destroy(tre_mem_t mem) +{ + tre_list_t *tmp, *l = mem->blocks; + + while (l != NULL) + { + xfree(l->data); + tmp = l->next; + xfree(l); + l = tmp; + } + xfree(mem); +} + + +/* Allocates a block of `size' bytes from `mem'. Returns a pointer to the + allocated block or NULL if an underlying malloc() failed. */ +void * +tre_mem_alloc_impl(tre_mem_t mem, int provided, void *provided_block, + int zero, size_t size) +{ + void *ptr; + + if (mem->failed) + { + DPRINT(("tre_mem_alloc: oops, called after failure?!\n")); + return NULL; + } + +#ifdef MALLOC_DEBUGGING + if (!provided) + { + ptr = xmalloc(1); + if (ptr == NULL) + { + DPRINT(("tre_mem_alloc: xmalloc forced failure\n")); + mem->failed = 1; + return NULL; + } + xfree(ptr); + } +#endif /* MALLOC_DEBUGGING */ + + if (mem->n < size) + { + /* We need more memory than is available in the current block. + Allocate a new block. */ + tre_list_t *l; + if (provided) + { + DPRINT(("tre_mem_alloc: using provided block\n")); + if (provided_block == NULL) + { + DPRINT(("tre_mem_alloc: provided block was NULL\n")); + mem->failed = 1; + return NULL; + } + mem->ptr = provided_block; + mem->n = TRE_MEM_BLOCK_SIZE; + } + else + { + int block_size; + if (size * 8 > TRE_MEM_BLOCK_SIZE) + block_size = size * 8; + else + block_size = TRE_MEM_BLOCK_SIZE; + DPRINT(("tre_mem_alloc: allocating new %d byte block\n", + block_size)); + l = xmalloc(sizeof(*l)); + if (l == NULL) + { + mem->failed = 1; + return NULL; + } + l->data = xmalloc(block_size); + if (l->data == NULL) + { + xfree(l); + mem->failed = 1; + return NULL; + } + l->next = NULL; + if (mem->current != NULL) + mem->current->next = l; + if (mem->blocks == NULL) + mem->blocks = l; + mem->current = l; + mem->ptr = l->data; + mem->n = block_size; + } + } + + /* Make sure the next pointer will be aligned. */ + size += ALIGN(mem->ptr + size, long); + + /* Allocate from current block. */ + ptr = mem->ptr; + mem->ptr += size; + mem->n -= size; + + /* Set to zero if needed. */ + if (zero) + memset(ptr, 0, size); + + return ptr; +} + +/* EOF */ diff --git a/src/regex/tre.h b/src/regex/tre.h new file mode 100644 index 00000000..bfd171f4 --- /dev/null +++ b/src/regex/tre.h @@ -0,0 +1,269 @@ +/* + tre-internal.h - TRE internal definitions + + Copyright (c) 2001-2006 Ville Laurikari <vl@iki.fi>. + + This library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + This library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + +*/ + +#include <regex.h> +#include <wchar.h> +#include <wctype.h> + +#define TRE_MULTIBYTE 1 +#undef TRE_MBSTATE +#define TRE_WCHAR 1 +#define TRE_USE_SYSTEM_WCTYPE 1 +#define HAVE_WCSTOMBS 1 +#define TRE_MB_CUR_MAX MB_CUR_MAX + +#define NDEBUG + +#define TRE_REGEX_T_FIELD __opaque +typedef int reg_errcode_t; + +typedef wchar_t tre_char_t; + + +#ifdef TRE_DEBUG +#include <stdio.h> +#define DPRINT(msg) do {printf msg; fflush(stdout);} while(0) +#else /* !TRE_DEBUG */ +#define DPRINT(msg) do { } while(0) +#endif /* !TRE_DEBUG */ + +#define elementsof(x) ( sizeof(x) / sizeof(x[0]) ) + +#if 1 +int __mbtowc(wchar_t *, const char *); +#define tre_mbrtowc(pwc, s, n, ps) (__mbtowc((pwc), (s))) +#else +#define tre_mbrtowc(pwc, s, n, ps) (mbtowc((pwc), (s), (n))) +#endif + +/* Wide characters. */ +typedef wint_t tre_cint_t; +#define TRE_CHAR_MAX WCHAR_MAX + +#ifdef TRE_MULTIBYTE +#define TRE_MB_CUR_MAX MB_CUR_MAX +#else /* !TRE_MULTIBYTE */ +#define TRE_MB_CUR_MAX 1 +#endif /* !TRE_MULTIBYTE */ + +#define tre_isalnum iswalnum +#define tre_isalpha iswalpha +#define tre_isblank iswblank +#define tre_iscntrl iswcntrl +#define tre_isdigit iswdigit +#define tre_isgraph iswgraph +#define tre_islower iswlower +#define tre_isprint iswprint +#define tre_ispunct iswpunct +#define tre_isspace iswspace +#define tre_isupper iswupper +#define tre_isxdigit iswxdigit + +#define tre_tolower towlower +#define tre_toupper towupper +#define tre_strlen wcslen + +/* Use system provided iswctype() and wctype(). */ +typedef wctype_t tre_ctype_t; +#define tre_isctype iswctype +#define tre_ctype wctype + +/* Returns number of bytes to add to (char *)ptr to make it + properly aligned for the type. */ +#define ALIGN(ptr, type) \ + ((((long)ptr) % sizeof(type)) \ + ? (sizeof(type) - (((long)ptr) % sizeof(type))) \ + : 0) + +#undef MAX +#undef MIN +#define MAX(a, b) (((a) >= (b)) ? (a) : (b)) +#define MIN(a, b) (((a) <= (b)) ? (a) : (b)) + +/* Define STRF to the correct printf formatter for strings. */ +#define STRF "ls" + +/* TNFA transition type. A TNFA state is an array of transitions, + the terminator is a transition with NULL `state'. */ +typedef struct tnfa_transition tre_tnfa_transition_t; + +struct tnfa_transition { + /* Range of accepted characters. */ + tre_cint_t code_min; + tre_cint_t code_max; + /* Pointer to the destination state. */ + tre_tnfa_transition_t *state; + /* ID number of the destination state. */ + int state_id; + /* -1 terminated array of tags (or NULL). */ + int *tags; + /* Assertion bitmap. */ + int assertions; + /* Assertion parameters. */ + union { + /* Character class assertion. */ + tre_ctype_t class; + /* Back reference assertion. */ + int backref; + } u; + /* Negative character class assertions. */ + tre_ctype_t *neg_classes; +}; + + +/* Assertions. */ +#define ASSERT_AT_BOL 1 /* Beginning of line. */ +#define ASSERT_AT_EOL 2 /* End of line. */ +#define ASSERT_CHAR_CLASS 4 /* Character class in `class'. */ +#define ASSERT_CHAR_CLASS_NEG 8 /* Character classes in `neg_classes'. */ +#define ASSERT_AT_BOW 16 /* Beginning of word. */ +#define ASSERT_AT_EOW 32 /* End of word. */ +#define ASSERT_AT_WB 64 /* Word boundary. */ +#define ASSERT_AT_WB_NEG 128 /* Not a word boundary. */ +#define ASSERT_BACKREF 256 /* A back reference in `backref'. */ +#define ASSERT_LAST 256 + +/* Tag directions. */ +typedef enum { + TRE_TAG_MINIMIZE = 0, + TRE_TAG_MAXIMIZE = 1 +} tre_tag_direction_t; + +/* Instructions to compute submatch register values from tag values + after a successful match. */ +struct tre_submatch_data { + /* Tag that gives the value for rm_so (submatch start offset). */ + int so_tag; + /* Tag that gives the value for rm_eo (submatch end offset). */ + int eo_tag; + /* List of submatches this submatch is contained in. */ + int *parents; +}; + +typedef struct tre_submatch_data tre_submatch_data_t; + + +/* TNFA definition. */ +typedef struct tnfa tre_tnfa_t; + +struct tnfa { + tre_tnfa_transition_t *transitions; + unsigned int num_transitions; + tre_tnfa_transition_t *initial; + tre_tnfa_transition_t *final; + tre_submatch_data_t *submatch_data; + unsigned int num_submatches; + tre_tag_direction_t *tag_directions; + int num_tags; + int end_tag; + int num_states; + int cflags; + int have_backrefs; +}; + +#if 0 +static int +tre_compile(regex_t *preg, const tre_char_t *regex, size_t n, int cflags); + +static void +tre_free(regex_t *preg); + +static void +tre_fill_pmatch(size_t nmatch, regmatch_t pmatch[], int cflags, + const tre_tnfa_t *tnfa, int *tags, int match_eo); + +static reg_errcode_t +tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len, + tre_str_type_t type, int *match_tags, int eflags, + int *match_end_ofs); + +static reg_errcode_t +tre_tnfa_run_parallel(const tre_tnfa_t *tnfa, const void *string, int len, + tre_str_type_t type, int *match_tags, int eflags, + int *match_end_ofs); + +static reg_errcode_t +tre_tnfa_run_backtrack(const tre_tnfa_t *tnfa, const void *string, + int len, tre_str_type_t type, int *match_tags, + int eflags, int *match_end_ofs); +#endif + +/* from tre-mem.h: */ + +#define TRE_MEM_BLOCK_SIZE 1024 + +typedef struct tre_list { + void *data; + struct tre_list *next; +} tre_list_t; + +typedef struct tre_mem_struct { + tre_list_t *blocks; + tre_list_t *current; + char *ptr; + size_t n; + int failed; + void **provided; +} *tre_mem_t; + +#define tre_mem_new_impl __tre_mem_new_impl +#define tre_mem_alloc_impl __tre_mem_alloc_impl +#define tre_mem_destroy __tre_mem_destroy + +tre_mem_t tre_mem_new_impl(int provided, void *provided_block); +void *tre_mem_alloc_impl(tre_mem_t mem, int provided, void *provided_block, + int zero, size_t size); + +/* Returns a new memory allocator or NULL if out of memory. */ +#define tre_mem_new() tre_mem_new_impl(0, NULL) + +/* Allocates a block of `size' bytes from `mem'. Returns a pointer to the + allocated block or NULL if an underlying malloc() failed. */ +#define tre_mem_alloc(mem, size) tre_mem_alloc_impl(mem, 0, NULL, 0, size) + +/* Allocates a block of `size' bytes from `mem'. Returns a pointer to the + allocated block or NULL if an underlying malloc() failed. The memory + is set to zero. */ +#define tre_mem_calloc(mem, size) tre_mem_alloc_impl(mem, 0, NULL, 1, size) + +#ifdef TRE_USE_ALLOCA +/* alloca() versions. Like above, but memory is allocated with alloca() + instead of malloc(). */ + +#define tre_mem_newa() \ + tre_mem_new_impl(1, alloca(sizeof(struct tre_mem_struct))) + +#define tre_mem_alloca(mem, size) \ + ((mem)->n >= (size) \ + ? tre_mem_alloc_impl((mem), 1, NULL, 0, (size)) \ + : tre_mem_alloc_impl((mem), 1, alloca(TRE_MEM_BLOCK_SIZE), 0, (size))) +#endif /* TRE_USE_ALLOCA */ + + +/* Frees the memory allocator and all memory allocated with it. */ +void tre_mem_destroy(tre_mem_t mem); + +#define xmalloc malloc +#define xcalloc calloc +#define xfree free +#define xrealloc realloc + +/* EOF */ |