diff options
Diffstat (limited to 'posix/wordexp.c')
| -rw-r--r-- | posix/wordexp.c | 2452 |
1 files changed, 0 insertions, 2452 deletions
diff --git a/posix/wordexp.c b/posix/wordexp.c deleted file mode 100644 index adece95ef8..0000000000 --- a/posix/wordexp.c +++ /dev/null @@ -1,2452 +0,0 @@ -/* POSIX.2 wordexp implementation. - Copyright (C) 1997-2002, 2003, 2005, 2006 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Contributed by Tim Waugh <tim@cyberelk.demon.co.uk>. - - The GNU C 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. - - The GNU C 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 the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <alloca.h> -#include <ctype.h> -#include <errno.h> -#include <fcntl.h> -#include <fnmatch.h> -#include <glob.h> -#include <libintl.h> -#include <paths.h> -#include <pwd.h> -#include <signal.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <sys/param.h> -#include <sys/stat.h> -#include <sys/time.h> -#include <sys/types.h> -#include <sys/types.h> -#include <sys/wait.h> -#include <unistd.h> -#ifdef USE_IN_LIBIO -# include <wchar.h> -#endif -#include <wordexp.h> - -#include <bits/libc-lock.h> -#include <stdio-common/_itoa.h> - -/* Undefine the following line for the production version. */ -/* #define NDEBUG 1 */ -#include <assert.h> - -/* Get some device information. */ -#include <device-nrs.h> - -/* - * This is a recursive-descent-style word expansion routine. - */ - -/* These variables are defined and initialized in the startup code. */ -extern int __libc_argc attribute_hidden; -extern char **__libc_argv attribute_hidden; - -/* Some forward declarations */ -static int parse_dollars (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, - wordexp_t *pwordexp, const char *ifs, - const char *ifs_white, int quoted) - internal_function; -static int parse_backtick (char **word, size_t *word_length, - size_t *max_length, const char *words, - size_t *offset, int flags, wordexp_t *pwordexp, - const char *ifs, const char *ifs_white) - internal_function; -static int parse_dquote (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, - wordexp_t *pwordexp, const char *ifs, - const char *ifs_white) - internal_function; -static int eval_expr (char *expr, long int *result) internal_function; - -/* The w_*() functions manipulate word lists. */ - -#define W_CHUNK (100) - -/* Result of w_newword will be ignored if it's the last word. */ -static inline char * -w_newword (size_t *actlen, size_t *maxlen) -{ - *actlen = *maxlen = 0; - return NULL; -} - -static char * -w_addchar (char *buffer, size_t *actlen, size_t *maxlen, char ch) - /* (lengths exclude trailing zero) */ -{ - /* Add a character to the buffer, allocating room for it if needed. */ - - if (*actlen == *maxlen) - { - char *old_buffer = buffer; - assert (buffer == NULL || *maxlen != 0); - *maxlen += W_CHUNK; - buffer = (char *) realloc (buffer, 1 + *maxlen); - - if (buffer == NULL) - free (old_buffer); - } - - if (buffer != NULL) - { - buffer[*actlen] = ch; - buffer[++(*actlen)] = '\0'; - } - - return buffer; -} - -static char * -internal_function -w_addmem (char *buffer, size_t *actlen, size_t *maxlen, const char *str, - size_t len) -{ - /* Add a string to the buffer, allocating room for it if needed. - */ - if (*actlen + len > *maxlen) - { - char *old_buffer = buffer; - assert (buffer == NULL || *maxlen != 0); - *maxlen += MAX (2 * len, W_CHUNK); - buffer = realloc (old_buffer, 1 + *maxlen); - - if (buffer == NULL) - free (old_buffer); - } - - if (buffer != NULL) - { - *((char *) __mempcpy (&buffer[*actlen], str, len)) = '\0'; - *actlen += len; - } - - return buffer; -} - -static char * -internal_function -w_addstr (char *buffer, size_t *actlen, size_t *maxlen, const char *str) - /* (lengths exclude trailing zero) */ -{ - /* Add a string to the buffer, allocating room for it if needed. - */ - size_t len; - - assert (str != NULL); /* w_addstr only called from this file */ - len = strlen (str); - - return w_addmem (buffer, actlen, maxlen, str, len); -} - -static int -internal_function -w_addword (wordexp_t *pwordexp, char *word) -{ - /* Add a word to the wordlist */ - size_t num_p; - char **new_wordv; - bool allocated = false; - - /* Internally, NULL acts like "". Convert NULLs to "" before - * the caller sees them. - */ - if (word == NULL) - { - word = __strdup (""); - if (word == NULL) - goto no_space; - allocated = true; - } - - num_p = 2 + pwordexp->we_wordc + pwordexp->we_offs; - new_wordv = realloc (pwordexp->we_wordv, sizeof (char *) * num_p); - if (new_wordv != NULL) - { - pwordexp->we_wordv = new_wordv; - pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc++] = word; - pwordexp->we_wordv[pwordexp->we_offs + pwordexp->we_wordc] = NULL; - return 0; - } - - if (allocated) - free (word); - -no_space: - return WRDE_NOSPACE; -} - -/* The parse_*() functions should leave *offset being the offset in 'words' - * to the last character processed. - */ - -static int -internal_function -parse_backslash (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset) -{ - /* We are poised _at_ a backslash, not in quotes */ - - switch (words[1 + *offset]) - { - case 0: - /* Backslash is last character of input words */ - return WRDE_SYNTAX; - - case '\n': - ++(*offset); - break; - - default: - *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); - if (*word == NULL) - return WRDE_NOSPACE; - - ++(*offset); - break; - } - - return 0; -} - -static int -internal_function -parse_qtd_backslash (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset) -{ - /* We are poised _at_ a backslash, inside quotes */ - - switch (words[1 + *offset]) - { - case 0: - /* Backslash is last character of input words */ - return WRDE_SYNTAX; - - case '\n': - ++(*offset); - break; - - case '$': - case '`': - case '"': - case '\\': - *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); - if (*word == NULL) - return WRDE_NOSPACE; - - ++(*offset); - break; - - default: - *word = w_addchar (*word, word_length, max_length, words[*offset]); - if (*word != NULL) - *word = w_addchar (*word, word_length, max_length, words[1 + *offset]); - - if (*word == NULL) - return WRDE_NOSPACE; - - ++(*offset); - break; - } - - return 0; -} - -static int -internal_function -parse_tilde (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, size_t wordc) -{ - /* We are poised _at_ a tilde */ - size_t i; - - if (*word_length != 0) - { - if (!((*word)[*word_length - 1] == '=' && wordc == 0)) - { - if (!((*word)[*word_length - 1] == ':' - && strchr (*word, '=') && wordc == 0)) - { - *word = w_addchar (*word, word_length, max_length, '~'); - return *word ? 0 : WRDE_NOSPACE; - } - } - } - - for (i = 1 + *offset; words[i]; i++) - { - if (words[i] == ':' || words[i] == '/' || words[i] == ' ' || - words[i] == '\t' || words[i] == 0 ) - break; - - if (words[i] == '\\') - { - *word = w_addchar (*word, word_length, max_length, '~'); - return *word ? 0 : WRDE_NOSPACE; - } - } - - if (i == 1 + *offset) - { - /* Tilde appears on its own */ - uid_t uid; - struct passwd pwd, *tpwd; - int buflen = 1000; - char* home; - char* buffer; - int result; - - /* POSIX.2 says ~ expands to $HOME and if HOME is unset the - results are unspecified. We do a lookup on the uid if - HOME is unset. */ - - home = getenv ("HOME"); - if (home != NULL) - { - *word = w_addstr (*word, word_length, max_length, home); - if (*word == NULL) - return WRDE_NOSPACE; - } - else - { - uid = __getuid (); - buffer = __alloca (buflen); - - while ((result = __getpwuid_r (uid, &pwd, buffer, buflen, &tpwd)) != 0 - && errno == ERANGE) - buffer = extend_alloca (buffer, buflen, buflen + 1000); - - if (result == 0 && tpwd != NULL && pwd.pw_dir != NULL) - { - *word = w_addstr (*word, word_length, max_length, pwd.pw_dir); - if (*word == NULL) - return WRDE_NOSPACE; - } - else - { - *word = w_addchar (*word, word_length, max_length, '~'); - if (*word == NULL) - return WRDE_NOSPACE; - } - } - } - else - { - /* Look up user name in database to get home directory */ - char *user = strndupa (&words[1 + *offset], i - (1 + *offset)); - struct passwd pwd, *tpwd; - int buflen = 1000; - char* buffer = __alloca (buflen); - int result; - - while ((result = __getpwnam_r (user, &pwd, buffer, buflen, &tpwd)) != 0 - && errno == ERANGE) - buffer = extend_alloca (buffer, buflen, buflen + 1000); - - if (result == 0 && tpwd != NULL && pwd.pw_dir) - *word = w_addstr (*word, word_length, max_length, pwd.pw_dir); - else - { - /* (invalid login name) */ - *word = w_addchar (*word, word_length, max_length, '~'); - if (*word != NULL) - *word = w_addstr (*word, word_length, max_length, user); - } - - *offset = i - 1; - } - return *word ? 0 : WRDE_NOSPACE; -} - - -static int -internal_function -do_parse_glob (const char *glob_word, char **word, size_t *word_length, - size_t *max_length, wordexp_t *pwordexp, const char *ifs, - const char *ifs_white) -{ - int error; - unsigned int match; - glob_t globbuf; - - error = glob (glob_word, GLOB_NOCHECK, NULL, &globbuf); - - if (error != 0) - { - /* We can only run into memory problems. */ - assert (error == GLOB_NOSPACE); - return WRDE_NOSPACE; - } - - if (ifs && !*ifs) - { - /* No field splitting allowed. */ - assert (globbuf.gl_pathv[0] != NULL); - *word = w_addstr (*word, word_length, max_length, globbuf.gl_pathv[0]); - for (match = 1; match < globbuf.gl_pathc && *word != NULL; ++match) - { - *word = w_addchar (*word, word_length, max_length, ' '); - if (*word != NULL) - *word = w_addstr (*word, word_length, max_length, - globbuf.gl_pathv[match]); - } - - globfree (&globbuf); - return *word ? 0 : WRDE_NOSPACE; - } - - assert (ifs == NULL || *ifs != '\0'); - if (*word != NULL) - { - free (*word); - *word = w_newword (word_length, max_length); - } - - for (match = 0; match < globbuf.gl_pathc; ++match) - { - char *matching_word = __strdup (globbuf.gl_pathv[match]); - if (matching_word == NULL || w_addword (pwordexp, matching_word)) - { - globfree (&globbuf); - return WRDE_NOSPACE; - } - } - - globfree (&globbuf); - return 0; -} - -static int -internal_function -parse_glob (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, - wordexp_t *pwordexp, const char *ifs, const char *ifs_white) -{ - /* We are poised just after a '*', a '[' or a '?'. */ - int error = WRDE_NOSPACE; - int quoted = 0; /* 1 if singly-quoted, 2 if doubly */ - size_t i; - wordexp_t glob_list; /* List of words to glob */ - - glob_list.we_wordc = 0; - glob_list.we_wordv = NULL; - glob_list.we_offs = 0; - for (; words[*offset] != '\0'; ++*offset) - { - if (strchr (ifs, words[*offset]) != NULL) - /* Reached IFS */ - break; - - /* Sort out quoting */ - if (words[*offset] == '\'') - { - if (quoted == 0) - { - quoted = 1; - continue; - } - else if (quoted == 1) - { - quoted = 0; - continue; - } - } - else if (words[*offset] == '"') - { - if (quoted == 0) - { - quoted = 2; - continue; - } - else if (quoted == 2) - { - quoted = 0; - continue; - } - } - - /* Sort out other special characters */ - if (quoted != 1 && words[*offset] == '$') - { - error = parse_dollars (word, word_length, max_length, words, - offset, flags, &glob_list, ifs, ifs_white, - quoted == 2); - if (error) - goto tidy_up; - - continue; - } - else if (words[*offset] == '\\') - { - if (quoted) - error = parse_qtd_backslash (word, word_length, max_length, - words, offset); - else - error = parse_backslash (word, word_length, max_length, - words, offset); - - if (error) - goto tidy_up; - - continue; - } - - *word = w_addchar (*word, word_length, max_length, words[*offset]); - if (*word == NULL) - goto tidy_up; - } - - /* Don't forget to re-parse the character we stopped at. */ - --*offset; - - /* Glob the words */ - error = w_addword (&glob_list, *word); - *word = w_newword (word_length, max_length); - for (i = 0; error == 0 && i < glob_list.we_wordc; i++) - error = do_parse_glob (glob_list.we_wordv[i], word, word_length, - max_length, pwordexp, ifs, ifs_white); - - /* Now tidy up */ -tidy_up: - wordfree (&glob_list); - return error; -} - -static int -internal_function -parse_squote (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset) -{ - /* We are poised just after a single quote */ - for (; words[*offset]; ++(*offset)) - { - if (words[*offset] != '\'') - { - *word = w_addchar (*word, word_length, max_length, words[*offset]); - if (*word == NULL) - return WRDE_NOSPACE; - } - else return 0; - } - - /* Unterminated string */ - return WRDE_SYNTAX; -} - -/* Functions to evaluate an arithmetic expression */ -static int -internal_function -eval_expr_val (char **expr, long int *result) -{ - char *digit; - - /* Skip white space */ - for (digit = *expr; digit && *digit && isspace (*digit); ++digit); - - if (*digit == '(') - { - /* Scan for closing paren */ - for (++digit; **expr && **expr != ')'; ++(*expr)); - - /* Is there one? */ - if (!**expr) - return WRDE_SYNTAX; - - *(*expr)++ = 0; - - if (eval_expr (digit, result)) - return WRDE_SYNTAX; - - return 0; - } - - /* POSIX requires that decimal, octal, and hexadecimal constants are - recognized. Therefore we pass 0 as the third parameter to strtol. */ - *result = strtol (digit, expr, 0); - if (digit == *expr) - return WRDE_SYNTAX; - - return 0; -} - -static int -internal_function -eval_expr_multdiv (char **expr, long int *result) -{ - long int arg; - - /* Read a Value */ - if (eval_expr_val (expr, result) != 0) - return WRDE_SYNTAX; - - while (**expr) - { - /* Skip white space */ - for (; *expr && **expr && isspace (**expr); ++(*expr)); - - if (**expr == '*') - { - ++(*expr); - if (eval_expr_val (expr, &arg) != 0) - return WRDE_SYNTAX; - - *result *= arg; - } - else if (**expr == '/') - { - ++(*expr); - if (eval_expr_val (expr, &arg) != 0) - return WRDE_SYNTAX; - - *result /= arg; - } - else break; - } - - return 0; -} - -static int -internal_function -eval_expr (char *expr, long int *result) -{ - long int arg; - - /* Read a Multdiv */ - if (eval_expr_multdiv (&expr, result) != 0) - return WRDE_SYNTAX; - - while (*expr) - { - /* Skip white space */ - for (; expr && *expr && isspace (*expr); ++expr); - - if (*expr == '+') - { - ++expr; - if (eval_expr_multdiv (&expr, &arg) != 0) - return WRDE_SYNTAX; - - *result += arg; - } - else if (*expr == '-') - { - ++expr; - if (eval_expr_multdiv (&expr, &arg) != 0) - return WRDE_SYNTAX; - - *result -= arg; - } - else break; - } - - return 0; -} - -static int -internal_function -parse_arith (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, int bracket) -{ - /* We are poised just after "$((" or "$[" */ - int error; - int paren_depth = 1; - size_t expr_length; - size_t expr_maxlen; - char *expr; - - expr = w_newword (&expr_length, &expr_maxlen); - for (; words[*offset]; ++(*offset)) - { - switch (words[*offset]) - { - case '$': - error = parse_dollars (&expr, &expr_length, &expr_maxlen, - words, offset, flags, NULL, NULL, NULL, 1); - /* The ``1'' here is to tell parse_dollars not to - * split the fields. - */ - if (error) - { - free (expr); - return error; - } - break; - - case '`': - (*offset)++; - error = parse_backtick (&expr, &expr_length, &expr_maxlen, - words, offset, flags, NULL, NULL, NULL); - /* The first NULL here is to tell parse_backtick not to - * split the fields. - */ - if (error) - { - free (expr); - return error; - } - break; - - case '\\': - error = parse_qtd_backslash (&expr, &expr_length, &expr_maxlen, - words, offset); - if (error) - { - free (expr); - return error; - } - /* I think that a backslash within an - * arithmetic expansion is bound to - * cause an error sooner or later anyway though. - */ - break; - - case ')': - if (--paren_depth == 0) - { - char result[21]; /* 21 = ceil(log10(2^64)) + 1 */ - long int numresult = 0; - long long int convertme; - - if (bracket || words[1 + *offset] != ')') - { - free (expr); - return WRDE_SYNTAX; - } - - ++(*offset); - - /* Go - evaluate. */ - if (*expr && eval_expr (expr, &numresult) != 0) - { - free (expr); - return WRDE_SYNTAX; - } - - if (numresult < 0) - { - convertme = -numresult; - *word = w_addchar (*word, word_length, max_length, '-'); - if (!*word) - { - free (expr); - return WRDE_NOSPACE; - } - } - else - convertme = numresult; - - result[20] = '\0'; - *word = w_addstr (*word, word_length, max_length, - _itoa (convertme, &result[20], 10, 0)); - free (expr); - return *word ? 0 : WRDE_NOSPACE; - } - expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]); - if (expr == NULL) - return WRDE_NOSPACE; - - break; - - case ']': - if (bracket && paren_depth == 1) - { - char result[21]; /* 21 = ceil(log10(2^64)) + 1 */ - long int numresult = 0; - - /* Go - evaluate. */ - if (*expr && eval_expr (expr, &numresult) != 0) - { - free (expr); - return WRDE_SYNTAX; - } - - result[20] = '\0'; - *word = w_addstr (*word, word_length, max_length, - _itoa_word (numresult, &result[20], 10, 0)); - free (expr); - return *word ? 0 : WRDE_NOSPACE; - } - - free (expr); - return WRDE_SYNTAX; - - case '\n': - case ';': - case '{': - case '}': - free (expr); - return WRDE_BADCHAR; - - case '(': - ++paren_depth; - default: - expr = w_addchar (expr, &expr_length, &expr_maxlen, words[*offset]); - if (expr == NULL) - return WRDE_NOSPACE; - } - } - - /* Premature end */ - free (expr); - return WRDE_SYNTAX; -} - -/* Function called by child process in exec_comm() */ -static inline void -internal_function __attribute__ ((always_inline)) -exec_comm_child (char *comm, int *fildes, int showerr, int noexec) -{ - const char *args[4] = { _PATH_BSHELL, "-c", comm, NULL }; - - /* Execute the command, or just check syntax? */ - if (noexec) - args[1] = "-nc"; - - /* Redirect output. */ - __dup2 (fildes[1], STDOUT_FILENO); - __close (fildes[1]); - - /* Redirect stderr to /dev/null if we have to. */ - if (showerr == 0) - { - struct stat64 st; - int fd; - __close (2); - fd = __open (_PATH_DEVNULL, O_WRONLY); - if (fd >= 0 && fd != 2) - { - __dup2 (fd, STDERR_FILENO); - __close (fd); - } - /* Be paranoid. Check that we actually opened the /dev/null - device. */ - if (__builtin_expect (__fxstat64 (_STAT_VER, STDERR_FILENO, &st), 0) != 0 - || __builtin_expect (S_ISCHR (st.st_mode), 1) == 0 -#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR - || st.st_rdev != makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR) -#endif - ) - /* It's not the /dev/null device. Stop right here. The - problem is: how do we stop? We use _exit() with an - hopefully unusual exit code. */ - _exit (90); - } - - /* Make sure the subshell doesn't field-split on our behalf. */ - __unsetenv ("IFS"); - - __close (fildes[0]); - __execve (_PATH_BSHELL, (char *const *) args, __environ); - - /* Bad. What now? */ - abort (); -} - -/* Function to execute a command and retrieve the results */ -/* pwordexp contains NULL if field-splitting is forbidden */ -static int -internal_function -exec_comm (char *comm, char **word, size_t *word_length, size_t *max_length, - int flags, wordexp_t *pwordexp, const char *ifs, - const char *ifs_white) -{ - int fildes[2]; -#define bufsize 128 - int buflen; - int i; - int status = 0; - size_t maxnewlines = 0; - char buffer[bufsize]; - pid_t pid; - int noexec = 0; - - /* Don't fork() unless necessary */ - if (!comm || !*comm) - return 0; - - if (__pipe (fildes)) - /* Bad */ - return WRDE_NOSPACE; - - again: - if ((pid = __fork ()) < 0) - { - /* Bad */ - if (fildes[0] != -1) - __close (fildes[0]); - if (fildes[1] != -1) - __close (fildes[1]); - return WRDE_NOSPACE; - } - - if (pid == 0) - exec_comm_child (comm, fildes, noexec ? 0 : flags & WRDE_SHOWERR, noexec); - - /* Parent */ - - /* If we are just testing the syntax, only wait. */ - if (noexec) - return (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) == pid - && status != 0) ? WRDE_SYNTAX : 0; - - __close (fildes[1]); - fildes[1] = -1; - - if (!pwordexp) - /* Quoted - no field splitting */ - { - while (1) - { - if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, - bufsize))) < 1) - { - if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, WNOHANG)) == 0) - continue; - if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, - bufsize))) < 1) - break; - } - - maxnewlines += buflen; - - *word = w_addmem (*word, word_length, max_length, buffer, buflen); - if (*word == NULL) - goto no_space; - } - } - else - /* Not quoted - split fields */ - { - int copying = 0; - /* 'copying' is: - * 0 when searching for first character in a field not IFS white space - * 1 when copying the text of a field - * 2 when searching for possible non-whitespace IFS - * 3 when searching for non-newline after copying field - */ - - while (1) - { - if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, - bufsize))) < 1) - { - if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, WNOHANG)) == 0) - continue; - if ((buflen = TEMP_FAILURE_RETRY (__read (fildes[0], buffer, - bufsize))) < 1) - break; - } - - for (i = 0; i < buflen; ++i) - { - if (strchr (ifs, buffer[i]) != NULL) - { - /* Current character is IFS */ - if (strchr (ifs_white, buffer[i]) == NULL) - { - /* Current character is IFS but not whitespace */ - if (copying == 2) - { - /* current character - * | - * V - * eg: text<space><comma><space>moretext - * - * So, strip whitespace IFS (like at the start) - */ - copying = 0; - continue; - } - - copying = 0; - /* fall through and delimit field.. */ - } - else - { - if (buffer[i] == '\n') - { - /* Current character is (IFS) newline */ - - /* If copying a field, this is the end of it, - but maybe all that's left is trailing newlines. - So start searching for a non-newline. */ - if (copying == 1) - copying = 3; - - continue; - } - else - { - /* Current character is IFS white space, but - not a newline */ - - /* If not either copying a field or searching - for non-newline after a field, ignore it */ - if (copying != 1 && copying != 3) - continue; - - /* End of field (search for non-ws IFS afterwards) */ - copying = 2; - } - } - - /* First IFS white space (non-newline), or IFS non-whitespace. - * Delimit the field. Nulls are converted by w_addword. */ - if (w_addword (pwordexp, *word) == WRDE_NOSPACE) - goto no_space; - - *word = w_newword (word_length, max_length); - - maxnewlines = 0; - /* fall back round the loop.. */ - } - else - { - /* Not IFS character */ - - if (copying == 3) - { - /* Nothing but (IFS) newlines since the last field, - so delimit it here before starting new word */ - if (w_addword (pwordexp, *word) == WRDE_NOSPACE) - goto no_space; - - *word = w_newword (word_length, max_length); - } - - copying = 1; - - if (buffer[i] == '\n') /* happens if newline not in IFS */ - maxnewlines++; - else - maxnewlines = 0; - - *word = w_addchar (*word, word_length, max_length, - buffer[i]); - if (*word == NULL) - goto no_space; - } - } - } - } - - /* Chop off trailing newlines (required by POSIX.2) */ - /* Ensure we don't go back further than the beginning of the - substitution (i.e. remove maxnewlines bytes at most) */ - while (maxnewlines-- != 0 && - *word_length > 0 && (*word)[*word_length - 1] == '\n') - { - (*word)[--*word_length] = '\0'; - - /* If the last word was entirely newlines, turn it into a new word - * which can be ignored if there's nothing following it. */ - if (*word_length == 0) - { - free (*word); - *word = w_newword (word_length, max_length); - break; - } - } - - __close (fildes[0]); - fildes[0] = -1; - - /* Check for syntax error (re-execute but with "-n" flag) */ - if (buflen < 1 && status != 0) - { - noexec = 1; - goto again; - } - - return 0; - -no_space: - __kill (pid, SIGKILL); - TEMP_FAILURE_RETRY (__waitpid (pid, NULL, 0)); - __close (fildes[0]); - return WRDE_NOSPACE; -} - -static int -internal_function -parse_comm (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, wordexp_t *pwordexp, - const char *ifs, const char *ifs_white) -{ - /* We are poised just after "$(" */ - int paren_depth = 1; - int error = 0; - int quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ - size_t comm_length; - size_t comm_maxlen; - char *comm = w_newword (&comm_length, &comm_maxlen); - - for (; words[*offset]; ++(*offset)) - { - switch (words[*offset]) - { - case '\'': - if (quoted == 0) - quoted = 1; - else if (quoted == 1) - quoted = 0; - - break; - - case '"': - if (quoted == 0) - quoted = 2; - else if (quoted == 2) - quoted = 0; - - break; - - case ')': - if (!quoted && --paren_depth == 0) - { - /* Go -- give script to the shell */ - if (comm) - { -#ifdef __libc_ptf_call - /* We do not want the exec_comm call to be cut short - by a thread cancellation since cleanup is very - ugly. Therefore disable cancellation for - now. */ - // XXX Ideally we do want the thread being cancelable. - // XXX If demand is there we'll change it. - int state = PTHREAD_CANCEL_ENABLE; - __libc_ptf_call (pthread_setcancelstate, - (PTHREAD_CANCEL_DISABLE, &state), 0); -#endif - - error = exec_comm (comm, word, word_length, max_length, - flags, pwordexp, ifs, ifs_white); - -#ifdef __libc_ptf_call - __libc_ptf_call (pthread_setcancelstate, (state, NULL), 0); -#endif - - free (comm); - } - - return error; - } - - /* This is just part of the script */ - break; - - case '(': - if (!quoted) - ++paren_depth; - } - - comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); - if (comm == NULL) - return WRDE_NOSPACE; - } - - /* Premature end. */ - free (comm); - - return WRDE_SYNTAX; -} - -static int -internal_function -parse_param (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, wordexp_t *pwordexp, - const char *ifs, const char *ifs_white, int quoted) -{ - /* We are poised just after "$" */ - enum action - { - ACT_NONE, - ACT_RP_SHORT_LEFT = '#', - ACT_RP_LONG_LEFT = 'L', - ACT_RP_SHORT_RIGHT = '%', - ACT_RP_LONG_RIGHT = 'R', - ACT_NULL_ERROR = '?', - ACT_NULL_SUBST = '-', - ACT_NONNULL_SUBST = '+', - ACT_NULL_ASSIGN = '=' - }; - size_t env_length; - size_t env_maxlen; - size_t pat_length; - size_t pat_maxlen; - size_t start = *offset; - char *env; - char *pattern; - char *value = NULL; - enum action action = ACT_NONE; - int depth = 0; - int colon_seen = 0; - int seen_hash = 0; - int free_value = 0; - int pattern_is_quoted = 0; /* 1 for singly-quoted, 2 for doubly-quoted */ - int error; - int special = 0; - char buffer[21]; - int brace = words[*offset] == '{'; - - env = w_newword (&env_length, &env_maxlen); - pattern = w_newword (&pat_length, &pat_maxlen); - - if (brace) - ++*offset; - - /* First collect the parameter name. */ - - if (words[*offset] == '#') - { - seen_hash = 1; - if (!brace) - goto envsubst; - ++*offset; - } - - if (isalpha (words[*offset]) || words[*offset] == '_') - { - /* Normal parameter name. */ - do - { - env = w_addchar (env, &env_length, &env_maxlen, - words[*offset]); - if (env == NULL) - goto no_space; - } - while (isalnum (words[++*offset]) || words[*offset] == '_'); - } - else if (isdigit (words[*offset])) - { - /* Numeric parameter name. */ - special = 1; - do - { - env = w_addchar (env, &env_length, &env_maxlen, - words[*offset]); - if (env == NULL) - goto no_space; - if (!brace) - goto envsubst; - } - while (isdigit(words[++*offset])); - } - else if (strchr ("*@$", words[*offset]) != NULL) - { - /* Special parameter. */ - special = 1; - env = w_addchar (env, &env_length, &env_maxlen, - words[*offset]); - if (env == NULL) - goto no_space; - ++*offset; - } - else - { - if (brace) - goto syntax; - } - - if (brace) - { - /* Check for special action to be applied to the value. */ - switch (words[*offset]) - { - case '}': - /* Evaluate. */ - goto envsubst; - - case '#': - action = ACT_RP_SHORT_LEFT; - if (words[1 + *offset] == '#') - { - ++*offset; - action = ACT_RP_LONG_LEFT; - } - break; - - case '%': - action = ACT_RP_SHORT_RIGHT; - if (words[1 + *offset] == '%') - { - ++*offset; - action = ACT_RP_LONG_RIGHT; - } - break; - - case ':': - if (strchr ("-=?+", words[1 + *offset]) == NULL) - goto syntax; - - colon_seen = 1; - action = words[++*offset]; - break; - - case '-': - case '=': - case '?': - case '+': - action = words[*offset]; - break; - - default: - goto syntax; - } - - /* Now collect the pattern, but don't expand it yet. */ - ++*offset; - for (; words[*offset]; ++(*offset)) - { - switch (words[*offset]) - { - case '{': - if (!pattern_is_quoted) - ++depth; - break; - - case '}': - if (!pattern_is_quoted) - { - if (depth == 0) - goto envsubst; - --depth; - } - break; - - case '\\': - if (pattern_is_quoted) - /* Quoted; treat as normal character. */ - break; - - /* Otherwise, it's an escape: next character is literal. */ - if (words[++*offset] == '\0') - goto syntax; - - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, '\\'); - if (pattern == NULL) - goto no_space; - - break; - - case '\'': - if (pattern_is_quoted == 0) - pattern_is_quoted = 1; - else if (pattern_is_quoted == 1) - pattern_is_quoted = 0; - - break; - - case '"': - if (pattern_is_quoted == 0) - pattern_is_quoted = 2; - else if (pattern_is_quoted == 2) - pattern_is_quoted = 0; - - break; - } - - pattern = w_addchar (pattern, &pat_length, &pat_maxlen, - words[*offset]); - if (pattern == NULL) - goto no_space; - } - } - - /* End of input string -- remember to reparse the character that we - * stopped at. */ - --(*offset); - -envsubst: - if (words[start] == '{' && words[*offset] != '}') - goto syntax; - - if (env == NULL) - { - if (seen_hash) - { - /* $# expands to the number of positional parameters */ - buffer[20] = '\0'; - value = _itoa_word (__libc_argc - 1, &buffer[20], 10, 0); - seen_hash = 0; - } - else - { - /* Just $ on its own */ - *offset = start - 1; - *word = w_addchar (*word, word_length, max_length, '$'); - return *word ? 0 : WRDE_NOSPACE; - } - } - /* Is it a numeric parameter? */ - else if (isdigit (env[0])) - { - int n = atoi (env); - - if (n >= __libc_argc) - /* Substitute NULL. */ - value = NULL; - else - /* Replace with appropriate positional parameter. */ - value = __libc_argv[n]; - } - /* Is it a special parameter? */ - else if (special) - { - /* Is it `$$'? */ - if (*env == '$') - { - buffer[20] = '\0'; - value = _itoa_word (__getpid (), &buffer[20], 10, 0); - } - /* Is it `${#*}' or `${#@}'? */ - else if ((*env == '*' || *env == '@') && seen_hash) - { - buffer[20] = '\0'; - value = _itoa_word (__libc_argc > 0 ? __libc_argc - 1 : 0, - &buffer[20], 10, 0); - *word = w_addstr (*word, word_length, max_length, value); - free (env); - free (pattern); - return *word ? 0 : WRDE_NOSPACE; - } - /* Is it `$*' or `$@' (unquoted) ? */ - else if (*env == '*' || (*env == '@' && !quoted)) - { - size_t plist_len = 0; - int p; - char *end; - - /* Build up value parameter by parameter (copy them) */ - for (p = 1; __libc_argv[p]; ++p) - plist_len += strlen (__libc_argv[p]) + 1; /* for space */ - value = malloc (plist_len); - if (value == NULL) - goto no_space; - end = value; - *end = 0; - for (p = 1; __libc_argv[p]; ++p) - { - if (p > 1) - *end++ = ' '; - end = __stpcpy (end, __libc_argv[p]); - } - - free_value = 1; - } - else - { - /* Must be a quoted `$@' */ - assert (*env == '@' && quoted); - - /* Each parameter is a separate word ("$@") */ - if (__libc_argc == 2) - value = __libc_argv[1]; - else if (__libc_argc > 2) - { - int p; - - /* Append first parameter to current word. */ - value = w_addstr (*word, word_length, max_length, - __libc_argv[1]); - if (value == NULL || w_addword (pwordexp, value)) - goto no_space; - - for (p = 2; __libc_argv[p + 1]; p++) - { - char *newword = __strdup (__libc_argv[p]); - if (newword == NULL || w_addword (pwordexp, newword)) - goto no_space; - } - - /* Start a new word with the last parameter. */ - *word = w_newword (word_length, max_length); - value = __libc_argv[p]; - } - else - { - free (env); - free (pattern); - return 0; - } - } - } - else - value = getenv (env); - - if (value == NULL && (flags & WRDE_UNDEF)) - { - /* Variable not defined. */ - error = WRDE_BADVAL; - goto do_error; - } - - if (action != ACT_NONE) - { - int expand_pattern = 0; - - /* First, find out if we need to expand pattern (i.e. if we will - * use it). */ - switch (action) - { - case ACT_RP_SHORT_LEFT: - case ACT_RP_LONG_LEFT: - case ACT_RP_SHORT_RIGHT: - case ACT_RP_LONG_RIGHT: - /* Always expand for these. */ - expand_pattern = 1; - break; - - case ACT_NULL_ERROR: - case ACT_NULL_SUBST: - case ACT_NULL_ASSIGN: - if (!value || (!*value && colon_seen)) - /* If param is unset, or set but null and a colon has been seen, - the expansion of the pattern will be needed. */ - expand_pattern = 1; - - break; - - case ACT_NONNULL_SUBST: - /* Expansion of word will be needed if parameter is set and not null, - or set null but no colon has been seen. */ - if (value && (*value || !colon_seen)) - expand_pattern = 1; - - break; - - default: - assert (! "Unrecognised action!"); - } - - if (expand_pattern) - { - /* We need to perform tilde expansion, parameter expansion, - command substitution, and arithmetic expansion. We also - have to be a bit careful with wildcard characters, as - pattern might be given to fnmatch soon. To do this, we - convert quotes to escapes. */ - - char *expanded; - size_t exp_len; - size_t exp_maxl; - char *p; - int quoted = 0; /* 1: single quotes; 2: double */ - - expanded = w_newword (&exp_len, &exp_maxl); - for (p = pattern; p && *p; p++) - { - size_t offset; - - switch (*p) - { - case '"': - if (quoted == 2) - quoted = 0; - else if (quoted == 0) - quoted = 2; - else break; - - continue; - - case '\'': - if (quoted == 1) - quoted = 0; - else if (quoted == 0) - quoted = 1; - else break; - - continue; - - case '*': - case '?': - if (quoted) - { - /* Convert quoted wildchar to escaped wildchar. */ - expanded = w_addchar (expanded, &exp_len, - &exp_maxl, '\\'); - - if (expanded == NULL) - goto no_space; - } - break; - - case '$': - offset = 0; - error = parse_dollars (&expanded, &exp_len, &exp_maxl, p, - &offset, flags, NULL, NULL, NULL, 1); - if (error) - { - if (free_value) - free (value); - - free (expanded); - - goto do_error; - } - - p += offset; - continue; - - case '~': - if (quoted || exp_len) - break; - - offset = 0; - error = parse_tilde (&expanded, &exp_len, &exp_maxl, p, - &offset, 0); - if (error) - { - if (free_value) - free (value); - - free (expanded); - - goto do_error; - } - - p += offset; - continue; - - case '\\': - expanded = w_addchar (expanded, &exp_len, &exp_maxl, '\\'); - ++p; - assert (*p); /* checked when extracted initially */ - if (expanded == NULL) - goto no_space; - } - - expanded = w_addchar (expanded, &exp_len, &exp_maxl, *p); - - if (expanded == NULL) - goto no_space; - } - - free (pattern); - - pattern = expanded; - } - - switch (action) - { - case ACT_RP_SHORT_LEFT: - case ACT_RP_LONG_LEFT: - case ACT_RP_SHORT_RIGHT: - case ACT_RP_LONG_RIGHT: - { - char *p; - char c; - char *end; - - if (value == NULL || pattern == NULL || *pattern == '\0') - break; - - end = value + strlen (value); - - switch (action) - { - case ACT_RP_SHORT_LEFT: - for (p = value; p <= end; ++p) - { - c = *p; - *p = '\0'; - if (fnmatch (pattern, value, 0) != FNM_NOMATCH) - { - *p = c; - if (free_value) - { - char *newval = __strdup (p); - if (newval == NULL) - { - free (value); - goto no_space; - } - free (value); - value = newval; - } - else - value = p; - break; - } - *p = c; - } - - break; - - case ACT_RP_LONG_LEFT: - for (p = end; p >= value; --p) - { - c = *p; - *p = '\0'; - if (fnmatch (pattern, value, 0) != FNM_NOMATCH) - { - *p = c; - if (free_value) - { - char *newval = __strdup (p); - if (newval == NULL) - { - free (value); - goto no_space; - } - free (value); - value = newval; - } - else - value = p; - break; - } - *p = c; - } - - break; - - case ACT_RP_SHORT_RIGHT: - for (p = end; p >= value; --p) - { - if (fnmatch (pattern, p, 0) != FNM_NOMATCH) - { - char *newval; - newval = malloc (p - value + 1); - - if (newval == NULL) - { - if (free_value) - free (value); - goto no_space; - } - - *(char *) __mempcpy (newval, value, p - value) = '\0'; - if (free_value) - free (value); - value = newval; - free_value = 1; - break; - } - } - - break; - - case ACT_RP_LONG_RIGHT: - for (p = value; p <= end; ++p) - { - if (fnmatch (pattern, p, 0) != FNM_NOMATCH) - { - char *newval; - newval = malloc (p - value + 1); - - if (newval == NULL) - { - if (free_value) - free (value); - goto no_space; - } - - *(char *) __mempcpy (newval, value, p - value) = '\0'; - if (free_value) - free (value); - value = newval; - free_value = 1; - break; - } - } - - break; - - default: - break; - } - - break; - } - - case ACT_NULL_ERROR: - if (value && *value) - /* Substitute parameter */ - break; - - error = 0; - if (!colon_seen && value) - /* Substitute NULL */ - ; - else - { - const char *str = pattern; - - if (str[0] == '\0') - str = _("parameter null or not set"); - - __fxprintf (NULL, "%s: %s\n", env, str); - } - - if (free_value) - free (value); - goto do_error; - - case ACT_NULL_SUBST: - if (value && *value) - /* Substitute parameter */ - break; - - if (free_value && value) - free (value); - - if (!colon_seen && value) - /* Substitute NULL */ - goto success; - - value = pattern ? __strdup (pattern) : pattern; - free_value = 1; - - if (pattern && !value) - goto no_space; - - break; - - case ACT_NONNULL_SUBST: - if (value && (*value || !colon_seen)) - { - if (free_value && value) - free (value); - - value = pattern ? __strdup (pattern) : pattern; - free_value = 1; - - if (pattern && !value) - goto no_space; - - break; - } - - /* Substitute NULL */ - if (free_value) - free (value); - goto success; - - case ACT_NULL_ASSIGN: - if (value && *value) - /* Substitute parameter */ - break; - - if (!colon_seen && value) - { - /* Substitute NULL */ - if (free_value) - free (value); - goto success; - } - - if (free_value) - free (value); - - value = pattern ? __strdup (pattern) : pattern; - free_value = 1; - - if (pattern && !value) - goto no_space; - - __setenv (env, value, 1); - break; - - default: - assert (! "Unrecognised action!"); - } - } - - free (env); - env = NULL; - free (pattern); - pattern = NULL; - - if (seen_hash) - { - char param_length[21]; - param_length[20] = '\0'; - *word = w_addstr (*word, word_length, max_length, - _itoa_word (value ? strlen (value) : 0, - ¶m_length[20], 10, 0)); - if (free_value) - { - assert (value != NULL); - free (value); - } - - return *word ? 0 : WRDE_NOSPACE; - } - - if (value == NULL) - return 0; - - if (quoted || !pwordexp) - { - /* Quoted - no field split */ - *word = w_addstr (*word, word_length, max_length, value); - if (free_value) - free (value); - - return *word ? 0 : WRDE_NOSPACE; - } - else - { - /* Need to field-split */ - char *value_copy = __strdup (value); /* Don't modify value */ - char *field_begin = value_copy; - int seen_nonws_ifs = 0; - - if (free_value) - free (value); - - if (value_copy == NULL) - goto no_space; - - do - { - char *field_end = field_begin; - char *next_field; - - /* If this isn't the first field, start a new word */ - if (field_begin != value_copy) - { - if (w_addword (pwordexp, *word) == WRDE_NOSPACE) - { - free (value_copy); - goto no_space; - } - - *word = w_newword (word_length, max_length); - } - - /* Skip IFS whitespace before the field */ - field_begin += strspn (field_begin, ifs_white); - - if (!seen_nonws_ifs && *field_begin == 0) - /* Nothing but whitespace */ - break; - - /* Search for the end of the field */ - field_end = field_begin + strcspn (field_begin, ifs); - - /* Set up pointer to the character after end of field and - skip whitespace IFS after it. */ - next_field = field_end + strspn (field_end, ifs_white); - - /* Skip at most one non-whitespace IFS character after the field */ - seen_nonws_ifs = 0; - if (*next_field && strchr (ifs, *next_field)) - { - seen_nonws_ifs = 1; - next_field++; - } - - /* Null-terminate it */ - *field_end = 0; - - /* Tag a copy onto the current word */ - *word = w_addstr (*word, word_length, max_length, field_begin); - - if (*word == NULL && *field_begin != '\0') - { - free (value_copy); - goto no_space; - } - - field_begin = next_field; - } - while (seen_nonws_ifs || *field_begin); - - free (value_copy); - } - - return 0; - -success: - error = 0; - goto do_error; - -no_space: - error = WRDE_NOSPACE; - goto do_error; - -syntax: - error = WRDE_SYNTAX; - -do_error: - free (env); - - free (pattern); - - return error; -} - -static int -internal_function -parse_dollars (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, - wordexp_t *pwordexp, const char *ifs, const char *ifs_white, - int quoted) -{ - /* We are poised _at_ "$" */ - switch (words[1 + *offset]) - { - case '"': - case '\'': - case 0: - *word = w_addchar (*word, word_length, max_length, '$'); - return *word ? 0 : WRDE_NOSPACE; - - case '(': - if (words[2 + *offset] == '(') - { - /* Differentiate between $((1+3)) and $((echo);(ls)) */ - int i = 3 + *offset; - int depth = 0; - while (words[i] && !(depth == 0 && words[i] == ')')) - { - if (words[i] == '(') - ++depth; - else if (words[i] == ')') - --depth; - - ++i; - } - - if (words[i] == ')' && words[i + 1] == ')') - { - (*offset) += 3; - /* Call parse_arith -- 0 is for "no brackets" */ - return parse_arith (word, word_length, max_length, words, offset, - flags, 0); - } - } - - if (flags & WRDE_NOCMD) - return WRDE_CMDSUB; - - (*offset) += 2; - return parse_comm (word, word_length, max_length, words, offset, flags, - quoted? NULL : pwordexp, ifs, ifs_white); - - case '[': - (*offset) += 2; - /* Call parse_arith -- 1 is for "brackets" */ - return parse_arith (word, word_length, max_length, words, offset, flags, - 1); - - case '{': - default: - ++(*offset); /* parse_param needs to know if "{" is there */ - return parse_param (word, word_length, max_length, words, offset, flags, - pwordexp, ifs, ifs_white, quoted); - } -} - -static int -internal_function -parse_backtick (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, - wordexp_t *pwordexp, const char *ifs, const char *ifs_white) -{ - /* We are poised just after "`" */ - int error; - int squoting = 0; - size_t comm_length; - size_t comm_maxlen; - char *comm = w_newword (&comm_length, &comm_maxlen); - - for (; words[*offset]; ++(*offset)) - { - switch (words[*offset]) - { - case '`': - /* Go -- give the script to the shell */ - error = exec_comm (comm, word, word_length, max_length, flags, - pwordexp, ifs, ifs_white); - free (comm); - return error; - - case '\\': - if (squoting) - { - error = parse_qtd_backslash (&comm, &comm_length, &comm_maxlen, - words, offset); - - if (error) - { - free (comm); - return error; - } - - break; - } - - ++(*offset); - error = parse_backslash (&comm, &comm_length, &comm_maxlen, words, - offset); - - if (error) - { - free (comm); - return error; - } - - break; - - case '\'': - squoting = 1 - squoting; - default: - comm = w_addchar (comm, &comm_length, &comm_maxlen, words[*offset]); - if (comm == NULL) - return WRDE_NOSPACE; - } - } - - /* Premature end */ - free (comm); - return WRDE_SYNTAX; -} - -static int -internal_function -parse_dquote (char **word, size_t *word_length, size_t *max_length, - const char *words, size_t *offset, int flags, - wordexp_t *pwordexp, const char * ifs, const char * ifs_white) -{ - /* We are poised just after a double-quote */ - int error; - - for (; words[*offset]; ++(*offset)) - { - switch (words[*offset]) - { - case '"': - return 0; - - case '$': - error = parse_dollars (word, word_length, max_length, words, offset, - flags, pwordexp, ifs, ifs_white, 1); - /* The ``1'' here is to tell parse_dollars not to - * split the fields. It may need to, however ("$@"). - */ - if (error) - return error; - - break; - - case '`': - if (flags & WRDE_NOCMD) - return WRDE_CMDSUB; - - ++(*offset); - error = parse_backtick (word, word_length, max_length, words, - offset, flags, NULL, NULL, NULL); - /* The first NULL here is to tell parse_backtick not to - * split the fields. - */ - if (error) - return error; - - break; - - case '\\': - error = parse_qtd_backslash (word, word_length, max_length, words, - offset); - - if (error) - return error; - - break; - - default: - *word = w_addchar (*word, word_length, max_length, words[*offset]); - if (*word == NULL) - return WRDE_NOSPACE; - } - } - - /* Unterminated string */ - return WRDE_SYNTAX; -} - -/* - * wordfree() is to be called after pwordexp is finished with. - */ - -void -wordfree (wordexp_t *pwordexp) -{ - - /* wordexp can set pwordexp to NULL */ - if (pwordexp && pwordexp->we_wordv) - { - char **wordv = pwordexp->we_wordv; - - for (wordv += pwordexp->we_offs; *wordv; ++wordv) - free (*wordv); - - free (pwordexp->we_wordv); - pwordexp->we_wordv = NULL; - } -} -libc_hidden_def (wordfree) - -/* - * wordexp() - */ - -int -wordexp (const char *words, wordexp_t *pwordexp, int flags) -{ - size_t words_offset; - size_t word_length; - size_t max_length; - char *word = w_newword (&word_length, &max_length); - int error; - char *ifs; - char ifs_white[4]; - wordexp_t old_word = *pwordexp; - - if (flags & WRDE_REUSE) - { - /* Minimal implementation of WRDE_REUSE for now */ - wordfree (pwordexp); - old_word.we_wordv = NULL; - } - - if ((flags & WRDE_APPEND) == 0) - { - pwordexp->we_wordc = 0; - - if (flags & WRDE_DOOFFS) - { - pwordexp->we_wordv = calloc (1 + pwordexp->we_offs, sizeof (char *)); - if (pwordexp->we_wordv == NULL) - { - error = WRDE_NOSPACE; - goto do_error; - } - } - else - { - pwordexp->we_wordv = calloc (1, sizeof (char *)); - if (pwordexp->we_wordv == NULL) - { - error = WRDE_NOSPACE; - goto do_error; - } - - pwordexp->we_offs = 0; - } - } - - /* Find out what the field separators are. - * There are two types: whitespace and non-whitespace. - */ - ifs = getenv ("IFS"); - - if (ifs == NULL) - /* IFS unset - use <space><tab><newline>. */ - ifs = strcpy (ifs_white, " \t\n"); - else - { - char *ifsch = ifs; - char *whch = ifs_white; - - while (*ifsch != '\0') - { - if (*ifsch == ' ' || *ifsch == '\t' || *ifsch == '\n') - { - /* Whitespace IFS. See first whether it is already in our - collection. */ - char *runp = ifs_white; - - while (runp < whch && *runp != *ifsch) - ++runp; - - if (runp == whch) - *whch++ = *ifsch; - } - - ++ifsch; - } - *whch = '\0'; - } - - for (words_offset = 0 ; words[words_offset] ; ++words_offset) - switch (words[words_offset]) - { - case '\\': - error = parse_backslash (&word, &word_length, &max_length, words, - &words_offset); - - if (error) - goto do_error; - - break; - - case '$': - error = parse_dollars (&word, &word_length, &max_length, words, - &words_offset, flags, pwordexp, ifs, ifs_white, - 0); - - if (error) - goto do_error; - - break; - - case '`': - if (flags & WRDE_NOCMD) - { - error = WRDE_CMDSUB; - goto do_error; - } - - ++words_offset; - error = parse_backtick (&word, &word_length, &max_length, words, - &words_offset, flags, pwordexp, ifs, - ifs_white); - - if (error) - goto do_error; - - break; - - case '"': - ++words_offset; - error = parse_dquote (&word, &word_length, &max_length, words, - &words_offset, flags, pwordexp, ifs, ifs_white); - - if (error) - goto do_error; - - if (!word_length) - { - error = w_addword (pwordexp, NULL); - - if (error) - return error; - } - - break; - - case '\'': - ++words_offset; - error = parse_squote (&word, &word_length, &max_length, words, - &words_offset); - - if (error) - goto do_error; - - if (!word_length) - { - error = w_addword (pwordexp, NULL); - - if (error) - return error; - } - - break; - - case '~': - error = parse_tilde (&word, &word_length, &max_length, words, - &words_offset, pwordexp->we_wordc); - - if (error) - goto do_error; - - break; - - case '*': - case '[': - case '?': - error = parse_glob (&word, &word_length, &max_length, words, - &words_offset, flags, pwordexp, ifs, ifs_white); - - if (error) - goto do_error; - - break; - - default: - /* Is it a word separator? */ - if (strchr (" \t", words[words_offset]) == NULL) - { - char ch = words[words_offset]; - - /* Not a word separator -- but is it a valid word char? */ - if (strchr ("\n|&;<>(){}", ch)) - { - /* Fail */ - error = WRDE_BADCHAR; - goto do_error; - } - - /* "Ordinary" character -- add it to word */ - word = w_addchar (word, &word_length, &max_length, - ch); - if (word == NULL) - { - error = WRDE_NOSPACE; - goto do_error; - } - - break; - } - - /* If a word has been delimited, add it to the list. */ - if (word != NULL) - { - error = w_addword (pwordexp, word); - if (error) - goto do_error; - } - - word = w_newword (&word_length, &max_length); - } - - /* End of string */ - - /* There was a word separator at the end */ - if (word == NULL) /* i.e. w_newword */ - return 0; - - /* There was no field separator at the end */ - return w_addword (pwordexp, word); - -do_error: - /* Error: - * free memory used (unless error is WRDE_NOSPACE), and - * set pwordexp members back to what they were. - */ - - free (word); - - if (error == WRDE_NOSPACE) - return WRDE_NOSPACE; - - if ((flags & WRDE_APPEND) == 0) - wordfree (pwordexp); - - *pwordexp = old_word; - return error; -} |