diff options
Diffstat (limited to 'REORG.TODO/iconv/iconvconfig.c')
| -rw-r--r-- | REORG.TODO/iconv/iconvconfig.c | 1245 |
1 files changed, 1245 insertions, 0 deletions
diff --git a/REORG.TODO/iconv/iconvconfig.c b/REORG.TODO/iconv/iconvconfig.c new file mode 100644 index 0000000000..9be4111a42 --- /dev/null +++ b/REORG.TODO/iconv/iconvconfig.c @@ -0,0 +1,1245 @@ +/* Generate fastloading iconv module configuration files. + Copyright (C) 2000-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2000. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; version 2 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, see <http://www.gnu.org/licenses/>. */ + +#include <argp.h> +#include <assert.h> +#include <error.h> +#include <errno.h> +#include <fcntl.h> +#include <libintl.h> +#include <locale.h> +#include <mcheck.h> +#include <search.h> +#include <stdint.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdio_ext.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/cdefs.h> +#include <sys/uio.h> + +#include "iconvconfig.h" + +/* Get libc version number. */ +#include "../version.h" + +#define PACKAGE _libc_intl_domainname + + +/* The hashing function we use. */ +#include "../intl/hash-string.h" + + +/* Types used. */ +struct module +{ + char *fromname; + struct Strent *fromname_strent; + char *filename; + struct Strent *filename_strent; + const char *directory; + struct Strent *directory_strent; + struct module *next; + int cost; + struct Strent *toname_strent; + char toname[0]; +}; + +struct alias +{ + char *fromname; + struct Strent *froment; + struct module *module; + struct Strent *toent; + char toname[0]; +}; + +struct name +{ + const char *name; + struct Strent *strent; + int module_idx; + uint32_t hashval; +}; + +struct name_info +{ + const char *canonical_name; + struct Strent *canonical_strent; + + struct module *from_internal; + struct module *to_internal; + + struct other_conv_list + { + int dest_idx; + struct other_conv + { + gidx_t module_idx; + struct module *module; + struct other_conv *next; + } other_conv; + struct other_conv_list *next; + } *other_conv_list; +}; + + +/* Name and version of program. */ +static void print_version (FILE *stream, struct argp_state *state); +void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version; + +/* Short description of program. */ +static const char doc[] = N_("\ +Create fastloading iconv module configuration file."); + +/* Strings for arguments in help texts. */ +static const char args_doc[] = N_("[DIR...]"); + +/* Prototype for option handler. */ +static error_t parse_opt (int key, char *arg, struct argp_state *state); + +/* Function to print some extra text in the help message. */ +static char *more_help (int key, const char *text, void *input); + +/* Definitions of arguments for argp functions. */ +#define OPT_PREFIX 300 +#define OPT_NOSTDLIB 301 +static const struct argp_option options[] = +{ + { "prefix", OPT_PREFIX, N_("PATH"), 0, + N_("Prefix used for all file accesses") }, + { "output", 'o', N_("FILE"), 0, N_("\ +Put output in FILE instead of installed location\ + (--prefix does not apply to FILE)") }, + { "nostdlib", OPT_NOSTDLIB, NULL, 0, + N_("Do not search standard directories, only those on the command line") }, + { NULL, 0, NULL, 0, NULL } +}; + +/* Data structure to communicate with argp functions. */ +static struct argp argp = +{ + options, parse_opt, args_doc, doc, NULL, more_help +}; + + +/* The function doing the actual work. */ +static int handle_dir (const char *dir); + +/* Add all known builtin conversions and aliases. */ +static void add_builtins (void); + +/* Create list of all aliases without circular aliases. */ +static void get_aliases (void); + +/* Create list of all modules. */ +static void get_modules (void); + +/* Get list of all the names and thereby indexing them. */ +static void generate_name_list (void); + +/* Collect information about all the names. */ +static void generate_name_info (void); + +/* Write the output file. */ +static int write_output (void); + + +/* Prefix to be used for all file accesses. */ +static const char *prefix = ""; +/* Its length. */ +static size_t prefix_len; + +/* Directory to place output file in. */ +static const char *output_file; +/* Its length. */ +static size_t output_file_len; + +/* If true, omit the GCONV_PATH directories and require some arguments. */ +static bool nostdlib; + +/* Search tree of the modules we know. */ +static void *modules; + +/* Search tree of the aliases we know. */ +static void *aliases; + +/* Search tree for name to index mapping. */ +static void *names; + +/* Number of names we know about. */ +static int nnames; + +/* List of all aliases. */ +static struct alias **alias_list; +static size_t nalias_list; +static size_t nalias_list_max; + +/* List of all modules. */ +static struct module **module_list; +static size_t nmodule_list; +static size_t nmodule_list_max; + +/* Names and information about them. */ +static struct name_info *name_info; +static size_t nname_info; + +/* Number of translations not from or to INTERNAL. */ +static size_t nextra_modules; + + +/* Names and aliases for the builtin transformations. */ +static struct +{ + const char *from; + const char *to; +} builtin_alias[] = + { +#define BUILTIN_ALIAS(alias, real) \ + { .from = alias, .to = real }, +#define BUILTIN_TRANSFORMATION(From, To, Cost, Name, Fct, BtowcFct, \ + MinF, MaxF, MinT, MaxT) +#include <gconv_builtin.h> + }; +#undef BUILTIN_ALIAS +#undef BUILTIN_TRANSFORMATION +#define nbuiltin_alias (sizeof (builtin_alias) / sizeof (builtin_alias[0])) + +static struct +{ + const char *from; + const char *to; + const char *module; + int cost; +} builtin_trans[] = + { +#define BUILTIN_ALIAS(alias, real) +#define BUILTIN_TRANSFORMATION(From, To, Cost, Name, Fct, BtowcFct, \ + MinF, MaxF, MinT, MaxT) \ + { .from = From, .to = To, .module = Name, .cost = Cost }, +#include <gconv_builtin.h> + }; +#undef BUILTIN_ALIAS +#undef BUILTIN_TRANSFORMATION +#define nbuiltin_trans (sizeof (builtin_trans) / sizeof (builtin_trans[0])) + + +/* Filename extension for the modules. */ +#ifndef MODULE_EXT +# define MODULE_EXT ".so" +#endif +static const char gconv_module_ext[] = MODULE_EXT; + + +#include <programs/xmalloc.h> + + +/* C string table handling. */ +struct Strtab; +struct Strent; + +/* Create new C string table object in memory. */ +extern struct Strtab *strtabinit (void); + +/* Free resources allocated for C string table ST. */ +extern void strtabfree (struct Strtab *st); + +/* Add string STR (length LEN is != 0) to C string table ST. */ +extern struct Strent *strtabadd (struct Strtab *st, const char *str, + size_t len); + +/* Finalize string table ST and store size in *SIZE and return a pointer. */ +extern void *strtabfinalize (struct Strtab *st, size_t *size); + +/* Get offset in string table for string associated with SE. */ +extern size_t strtaboffset (struct Strent *se); + +/* String table we construct. */ +static struct Strtab *strtab; + + + +int +main (int argc, char *argv[]) +{ + int remaining; + int status = 0; + + /* Enable memory use testing. */ + /* mcheck_pedantic (NULL); */ + mtrace (); + + /* Set locale via LC_ALL. */ + setlocale (LC_ALL, ""); + + /* Set the text message domain. */ + textdomain (_libc_intl_domainname); + + /* Parse and process arguments. */ + argp_parse (&argp, argc, argv, 0, &remaining, NULL); + + if (nostdlib && remaining == argc) + error (2, 0, _("Directory arguments required when using --nostdlib")); + + /* Initialize the string table. */ + strtab = strtabinit (); + + /* Handle all directories mentioned. */ + while (remaining < argc) + status |= handle_dir (argv[remaining++]); + + if (! nostdlib) + { + /* In any case also handle the standard directory. */ + char *path = strdupa (GCONV_PATH), *tp = strsep (&path, ":"); + while (tp != NULL) + { + status |= handle_dir (tp); + + tp = strsep (&path, ":"); + } + } + + /* Add the builtin transformations and aliases without overwriting + anything. */ + add_builtins (); + + /* Store aliases in an array. */ + get_aliases (); + + /* Get list of all modules. */ + get_modules (); + + /* Generate list of all the names we know to handle in some way. */ + generate_name_list (); + + /* Now we know all the names we will handle, collect information + about them. */ + generate_name_info (); + + /* Write the output file, but only if we haven't seen any error. */ + if (status == 0) + status = write_output (); + else + error (1, 0, _("no output file produced because warnings were issued")); + + return status; +} + + +/* Handle program arguments. */ +static error_t +parse_opt (int key, char *arg, struct argp_state *state) +{ + switch (key) + { + case OPT_PREFIX: + prefix = arg; + prefix_len = strlen (prefix); + break; + case 'o': + output_file = arg; + output_file_len = strlen (output_file); + break; + case OPT_NOSTDLIB: + nostdlib = true; + break; + default: + return ARGP_ERR_UNKNOWN; + } + return 0; +} + + +static char * +more_help (int key, const char *text, void *input) +{ + char *tp = NULL; + switch (key) + { + case ARGP_KEY_HELP_EXTRA: + /* We print some extra information. */ + if (asprintf (&tp, gettext ("\ +For bug reporting instructions, please see:\n\ +%s.\n"), REPORT_BUGS_TO) < 0) + return NULL; + return tp; + default: + break; + } + return (char *) text; +} + + +/* Print the version information. */ +static void +print_version (FILE *stream, struct argp_state *state) +{ + fprintf (stream, "iconvconfig %s%s\n", PKGVERSION, VERSION); + fprintf (stream, gettext ("\ +Copyright (C) %s Free Software Foundation, Inc.\n\ +This is free software; see the source for copying conditions. There is NO\n\ +warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n\ +"), "2017"); + fprintf (stream, gettext ("Written by %s.\n"), "Ulrich Drepper"); +} + + +static int +alias_compare (const void *p1, const void *p2) +{ + const struct alias *a1 = (const struct alias *) p1; + const struct alias *a2 = (const struct alias *) p2; + + return strcmp (a1->fromname, a2->fromname); +} + + +static void +new_alias (const char *fromname, size_t fromlen, const char *toname, + size_t tolen) +{ + struct alias *newp; + void **inserted; + + newp = (struct alias *) xmalloc (sizeof (struct alias) + fromlen + tolen); + + newp->fromname = mempcpy (newp->toname, toname, tolen); + memcpy (newp->fromname, fromname, fromlen); + newp->module = NULL; + + inserted = (void **) tsearch (newp, &aliases, alias_compare); + if (inserted == NULL) + error (EXIT_FAILURE, errno, gettext ("while inserting in search tree")); + if (*inserted != newp) + /* Something went wrong, free this entry. */ + free (newp); + else + { + newp->froment = strtabadd (strtab, newp->fromname, fromlen); + newp->toent = strtabadd (strtab, newp->toname, tolen); + } +} + + +/* Add new alias. */ +static void +add_alias (char *rp) +{ + /* We now expect two more string. The strings are normalized + (converted to UPPER case) and strored in the alias database. */ + char *from; + char *to; + char *wp; + + while (isspace (*rp)) + ++rp; + from = wp = rp; + while (*rp != '\0' && !isspace (*rp)) + *wp++ = toupper (*rp++); + if (*rp == '\0') + /* There is no `to' string on the line. Ignore it. */ + return; + *wp++ = '\0'; + to = ++rp; + while (isspace (*rp)) + ++rp; + while (*rp != '\0' && !isspace (*rp)) + *wp++ = toupper (*rp++); + if (to == wp) + /* No `to' string, ignore the line. */ + return; + *wp++ = '\0'; + + assert (strlen (from) + 1 == (size_t) (to - from)); + assert (strlen (to) + 1 == (size_t) (wp - to)); + + new_alias (from, to - from, to, wp - to); +} + + +static void +append_alias (const void *nodep, VISIT value, int level) +{ + if (value != leaf && value != postorder) + return; + + if (nalias_list_max == nalias_list) + { + nalias_list_max += 50; + alias_list = (struct alias **) xrealloc (alias_list, + (nalias_list_max + * sizeof (struct alias *))); + } + + alias_list[nalias_list++] = *(struct alias **) nodep; +} + + +static void +get_aliases (void) +{ + twalk (aliases, append_alias); +} + + +static int +module_compare (const void *p1, const void *p2) +{ + const struct module *m1 = (const struct module *) p1; + const struct module *m2 = (const struct module *) p2; + int result; + + result = strcmp (m1->fromname, m2->fromname); + if (result == 0) + result = strcmp (m1->toname, m2->toname); + + return result; +} + + +/* Create new module record. */ +static void +new_module (const char *fromname, size_t fromlen, const char *toname, + size_t tolen, const char *directory, + const char *filename, size_t filelen, int cost, size_t need_ext) +{ + struct module *new_module; + size_t dirlen = strlen (directory) + 1; + char *tmp; + void **inserted; + + new_module = (struct module *) xmalloc (sizeof (struct module) + + fromlen + tolen + filelen + + need_ext); + + new_module->fromname = mempcpy (new_module->toname, toname, tolen); + + new_module->filename = mempcpy (new_module->fromname, fromname, fromlen); + + new_module->cost = cost; + new_module->next = NULL; + + tmp = mempcpy (new_module->filename, filename, filelen); + if (need_ext) + { + memcpy (tmp - 1, gconv_module_ext, need_ext + 1); + filelen += need_ext; + } + new_module->directory = directory; + + /* Now insert the new module data structure in our search tree. */ + inserted = (void **) tsearch (new_module, &modules, module_compare); + if (inserted == NULL) + error (EXIT_FAILURE, errno, "while inserting in search tree"); + if (*inserted != new_module) + free (new_module); + else + { + new_module->fromname_strent = strtabadd (strtab, new_module->fromname, + fromlen); + new_module->toname_strent = strtabadd (strtab, new_module->toname, + tolen); + new_module->filename_strent = strtabadd (strtab, new_module->filename, + filelen); + new_module->directory_strent = strtabadd (strtab, directory, dirlen); + } +} + + +/* Add new module. */ +static void +internal_function +add_module (char *rp, const char *directory) +{ + /* We expect now + 1. `from' name + 2. `to' name + 3. filename of the module + 4. an optional cost value + */ + char *from; + char *to; + char *module; + char *wp; + int need_ext; + int cost; + + while (isspace (*rp)) + ++rp; + from = rp; + while (*rp != '\0' && !isspace (*rp)) + { + *rp = toupper (*rp); + ++rp; + } + if (*rp == '\0') + return; + *rp++ = '\0'; + to = wp = rp; + while (isspace (*rp)) + ++rp; + while (*rp != '\0' && !isspace (*rp)) + *wp++ = toupper (*rp++); + if (*rp == '\0') + return; + *wp++ = '\0'; + do + ++rp; + while (isspace (*rp)); + module = wp; + while (*rp != '\0' && !isspace (*rp)) + *wp++ = *rp++; + if (*rp == '\0') + { + /* There is no cost, use one by default. */ + *wp++ = '\0'; + cost = 1; + } + else + { + /* There might be a cost value. */ + char *endp; + + *wp++ = '\0'; + cost = strtol (rp, &endp, 10); + if (rp == endp || cost < 1) + /* No useful information. */ + cost = 1; + } + + if (module[0] == '\0') + /* No module name given. */ + return; + + /* See whether we must add the ending. */ + need_ext = 0; + if ((size_t) (wp - module) < sizeof (gconv_module_ext) + || memcmp (wp - sizeof (gconv_module_ext), gconv_module_ext, + sizeof (gconv_module_ext)) != 0) + /* We must add the module extension. */ + need_ext = sizeof (gconv_module_ext) - 1; + + assert (strlen (from) + 1 == (size_t) (to - from)); + assert (strlen (to) + 1 == (size_t) (module - to)); + assert (strlen (module) + 1 == (size_t) (wp - module)); + + new_module (from, to - from, to, module - to, directory, module, wp - module, + cost, need_ext); +} + + +/* Read the config file and add the data for this directory to that. */ +static int +handle_dir (const char *dir) +{ + char *cp; + FILE *fp; + char *line = NULL; + size_t linelen = 0; + size_t dirlen = strlen (dir); + + if (dir[dirlen - 1] != '/') + { + char *newp = (char *) xmalloc (dirlen + 2); + dir = memcpy (newp, dir, dirlen); + newp[dirlen++] = '/'; + newp[dirlen] = '\0'; + } + + char infile[prefix_len + dirlen + sizeof "gconv-modules"]; + cp = infile; + if (dir[0] == '/') + cp = mempcpy (cp, prefix, prefix_len); + strcpy (mempcpy (cp, dir, dirlen), "gconv-modules"); + + fp = fopen (infile, "r"); + if (fp == NULL) + { + error (0, errno, "cannot open `%s'", infile); + return 1; + } + + /* No threads present. */ + __fsetlocking (fp, FSETLOCKING_BYCALLER); + + while (!feof_unlocked (fp)) + { + char *rp, *endp, *word; + ssize_t n = __getdelim (&line, &linelen, '\n', fp); + + if (n < 0) + /* An error occurred. */ + break; + + rp = line; + /* Terminate the line (excluding comments or newline) with a NUL + byte to simplify the following code. */ + endp = strchr (rp, '#'); + if (endp != NULL) + *endp = '\0'; + else + if (rp[n - 1] == '\n') + rp[n - 1] = '\0'; + + while (isspace (*rp)) + ++rp; + + /* If this is an empty line go on with the next one. */ + if (rp == endp) + continue; + + word = rp; + while (*rp != '\0' && !isspace (*rp)) + ++rp; + + if (rp - word == sizeof ("alias") - 1 + && memcmp (word, "alias", sizeof ("alias") - 1) == 0) + add_alias (rp); + else if (rp - word == sizeof ("module") - 1 + && memcmp (word, "module", sizeof ("module") - 1) == 0) + add_module (rp, dir); + /* else */ + /* Otherwise ignore the line. */ + } + + free (line); + + fclose (fp); + + return 0; +} + + +static void +append_module (const void *nodep, VISIT value, int level) +{ + struct module *mo; + + if (value != leaf && value != postorder) + return; + + mo = *(struct module **) nodep; + + if (nmodule_list > 0 + && strcmp (module_list[nmodule_list - 1]->fromname, mo->fromname) == 0) + { + /* Same name. */ + mo->next = module_list[nmodule_list - 1]; + module_list[nmodule_list - 1] = mo; + + return; + } + + if (nmodule_list_max == nmodule_list) + { + nmodule_list_max += 50; + module_list = (struct module **) xrealloc (module_list, + (nmodule_list_max + * sizeof (struct module *))); + } + + module_list[nmodule_list++] = mo; +} + + +static void +get_modules (void) +{ + twalk (modules, append_module); +} + + +static void +add_builtins (void) +{ + size_t cnt; + + /* Add all aliases. */ + for (cnt = 0; cnt < nbuiltin_alias; ++cnt) + new_alias (builtin_alias[cnt].from, + strlen (builtin_alias[cnt].from) + 1, + builtin_alias[cnt].to, + strlen (builtin_alias[cnt].to) + 1); + + /* add the builtin transformations. */ + for (cnt = 0; cnt < nbuiltin_trans; ++cnt) + new_module (builtin_trans[cnt].from, + strlen (builtin_trans[cnt].from) + 1, + builtin_trans[cnt].to, + strlen (builtin_trans[cnt].to) + 1, + "", builtin_trans[cnt].module, + strlen (builtin_trans[cnt].module) + 1, + builtin_trans[cnt].cost, 0); +} + + +static int +name_compare (const void *p1, const void *p2) +{ + const struct name *n1 = (const struct name *) p1; + const struct name *n2 = (const struct name *) p2; + + return strcmp (n1->name, n2->name); +} + + +static struct name * +new_name (const char *str, struct Strent *strent) +{ + struct name *newp = (struct name *) xmalloc (sizeof (struct name)); + + newp->name = str; + newp->strent = strent; + newp->module_idx = -1; + newp->hashval = __hash_string (str); + + ++nnames; + + return newp; +} + + +static void +generate_name_list (void) +{ + size_t i; + + /* A name we always need. */ + tsearch (new_name ("INTERNAL", strtabadd (strtab, "INTERNAL", + sizeof ("INTERNAL"))), + &names, name_compare); + + for (i = 0; i < nmodule_list; ++i) + { + struct module *runp; + + if (strcmp (module_list[i]->fromname, "INTERNAL") != 0) + tsearch (new_name (module_list[i]->fromname, + module_list[i]->fromname_strent), + &names, name_compare); + + for (runp = module_list[i]; runp != NULL; runp = runp->next) + if (strcmp (runp->toname, "INTERNAL") != 0) + tsearch (new_name (runp->toname, runp->toname_strent), + &names, name_compare); + } +} + + +static int +name_to_module_idx (const char *name, int add) +{ + struct name **res; + struct name fake_name = { .name = name }; + int idx; + + res = (struct name **) tfind (&fake_name, &names, name_compare); + if (res == NULL) + abort (); + + idx = (*res)->module_idx; + if (idx == -1 && add) + /* No module index assigned yet. */ + idx = (*res)->module_idx = nname_info++; + + return idx; +} + + +static void +generate_name_info (void) +{ + size_t i; + int idx; + + name_info = (struct name_info *) xcalloc (nmodule_list + 1, + sizeof (struct name_info)); + + /* First add a special entry for the INTERNAL name. This must have + index zero. */ + idx = name_to_module_idx ("INTERNAL", 1); + name_info[0].canonical_name = "INTERNAL"; + name_info[0].canonical_strent = strtabadd (strtab, "INTERNAL", + sizeof ("INTERNAL")); + assert (nname_info == 1); + + for (i = 0; i < nmodule_list; ++i) + { + struct module *runp; + + for (runp = module_list[i]; runp != NULL; runp = runp->next) + if (strcmp (runp->fromname, "INTERNAL") == 0) + { + idx = name_to_module_idx (runp->toname, 1); + name_info[idx].from_internal = runp; + assert (name_info[idx].canonical_name == NULL + || strcmp (name_info[idx].canonical_name, + runp->toname) == 0); + name_info[idx].canonical_name = runp->toname; + name_info[idx].canonical_strent = runp->toname_strent; + } + else if (strcmp (runp->toname, "INTERNAL") == 0) + { + idx = name_to_module_idx (runp->fromname, 1); + name_info[idx].to_internal = runp; + assert (name_info[idx].canonical_name == NULL + || strcmp (name_info[idx].canonical_name, + runp->fromname) == 0); + name_info[idx].canonical_name = runp->fromname; + name_info[idx].canonical_strent = runp->fromname_strent; + } + else + { + /* This is a transformation not to or from the INTERNAL + encoding. */ + int from_idx = name_to_module_idx (runp->fromname, 1); + int to_idx = name_to_module_idx (runp->toname, 1); + struct other_conv_list *newp; + + newp = (struct other_conv_list *) + xmalloc (sizeof (struct other_conv_list)); + newp->other_conv.module_idx = to_idx; + newp->other_conv.module = runp; + newp->other_conv.next = NULL; /* XXX Allow multiple module sequence */ + newp->dest_idx = to_idx; + newp->next = name_info[from_idx].other_conv_list; + name_info[from_idx].other_conv_list = newp; + assert (name_info[from_idx].canonical_name == NULL + || strcmp (name_info[from_idx].canonical_name, + runp->fromname) == 0); + name_info[from_idx].canonical_name = runp->fromname; + name_info[from_idx].canonical_strent = runp->fromname_strent; + + ++nextra_modules; + } + } + + /* Now add the module index information for all the aliases. */ + for (i = 0; i < nalias_list; ++i) + { + struct name fake_name = { .name = alias_list[i]->toname }; + struct name **tonamep; + + tonamep = (struct name **) tfind (&fake_name, &names, name_compare); + if (tonamep != NULL) + { + struct name *newp = new_name (alias_list[i]->fromname, + alias_list[i]->froment); + newp->module_idx = (*tonamep)->module_idx; + tsearch (newp, &names, name_compare); + } + } +} + + +static int +is_prime (unsigned long int candidate) +{ + /* No even number and none less than 10 will be passed here. */ + unsigned long int divn = 3; + unsigned long int sq = divn * divn; + + while (sq < candidate && candidate % divn != 0) + { + ++divn; + sq += 4 * divn; + ++divn; + } + + return candidate % divn != 0; +} + + +static uint32_t +next_prime (uint32_t seed) +{ + /* Make it definitely odd. */ + seed |= 1; + + while (!is_prime (seed)) + seed += 2; + + return seed; +} + + +/* Format of the output file. + + Offset Length Description + 0000 4 Magic header bytes + 0004 2 Offset of string table (stoff) + 0006 2 Offset of name hashing table (hoff) + 0008 2 Hashing table size (hsize) + 000A 2 Offset of module table (moff) + 000C 2 Offset of other conversion module table (ooff) + + stoff ??? String table + + hoff 8*hsize Array of tuples + string table offset + module index + + moff ??? Array of tuples + canonical name offset + from-internal module dir name offset + from-internal module name off + to-internal module dir name offset + to-internal module name offset + offset into other conversion table + + ooff ??? One or more of + number of steps/modules + one or more of tuple + canonical name offset for output + module dir name offset + module name offset + (following last entry with step count 0) +*/ + +static struct hash_entry *hash_table; +static size_t hash_size; + +/* Function to insert the names. */ +static void name_insert (const void *nodep, VISIT value, int level) +{ + struct name *name; + unsigned int idx; + unsigned int hval2; + + if (value != leaf && value != postorder) + return; + + name = *(struct name **) nodep; + idx = name->hashval % hash_size; + hval2 = 1 + name->hashval % (hash_size - 2); + + while (hash_table[idx].string_offset != 0) + if ((idx += hval2) >= hash_size) + idx -= hash_size; + + hash_table[idx].string_offset = strtaboffset (name->strent); + + assert (name->module_idx != -1); + hash_table[idx].module_idx = name->module_idx; +} + +static int +write_output (void) +{ + int fd; + char *string_table; + size_t string_table_size; + struct gconvcache_header header; + struct module_entry *module_table; + char *extra_table; + char *cur_extra_table; + size_t n; + int idx; + struct iovec iov[6]; + static const gidx_t null_word; + size_t total; + char finalname[prefix_len + sizeof GCONV_MODULES_CACHE]; + char tmpfname[(output_file == NULL ? sizeof finalname : output_file_len + 1) + + strlen (".XXXXXX")]; + + /* Open the output file. */ + if (output_file == NULL) + { + assert (GCONV_MODULES_CACHE[0] == '/'); + strcpy (stpcpy (mempcpy (tmpfname, prefix, prefix_len), + GCONV_MODULES_CACHE), + ".XXXXXX"); + strcpy (mempcpy (finalname, prefix, prefix_len), GCONV_MODULES_CACHE); + } + else + strcpy (mempcpy (tmpfname, output_file, output_file_len), ".XXXXXX"); + fd = mkstemp (tmpfname); + if (fd == -1) + return 1; + + /* Create the string table. */ + string_table = strtabfinalize (strtab, &string_table_size); + + /* Create the hashing table. We know how many strings we have. + Creating a perfect hash table is not reasonable here. Therefore + we use open hashing and a table size which is the next prime 40% + larger than the number of strings. */ + hash_size = next_prime (nnames * 1.4); + hash_table = (struct hash_entry *) xcalloc (hash_size, + sizeof (struct hash_entry)); + /* Fill the hash table. */ + twalk (names, name_insert); + + /* Create the section for the module list. */ + module_table = (struct module_entry *) xcalloc (sizeof (struct module_entry), + nname_info); + + /* Allocate memory for the non-INTERNAL conversions. The allocated + memory can be more than is actually needed. */ + extra_table = (char *) xcalloc (sizeof (struct extra_entry) + + sizeof (gidx_t) + + sizeof (struct extra_entry_module), + nextra_modules); + cur_extra_table = extra_table; + + /* Fill in the module information. */ + for (n = 0; n < nname_info; ++n) + { + module_table[n].canonname_offset = + strtaboffset (name_info[n].canonical_strent); + + if (name_info[n].from_internal == NULL) + { + module_table[n].fromdir_offset = 0; + module_table[n].fromname_offset = 0; + } + else + { + module_table[n].fromdir_offset = + strtaboffset (name_info[n].from_internal->directory_strent); + module_table[n].fromname_offset = + strtaboffset (name_info[n].from_internal->filename_strent); + } + + if (name_info[n].to_internal == NULL) + { + module_table[n].todir_offset = 0; + module_table[n].toname_offset = 0; + } + else + { + module_table[n].todir_offset = + strtaboffset (name_info[n].to_internal->directory_strent); + module_table[n].toname_offset = + strtaboffset (name_info[n].to_internal->filename_strent); + } + + if (name_info[n].other_conv_list != NULL) + { + struct other_conv_list *other = name_info[n].other_conv_list; + + /* Store the reference. We add 1 to distinguish the entry + at offset zero from the case where no extra modules are + available. The file reader has to account for the + offset. */ + module_table[n].extra_offset = 1 + cur_extra_table - extra_table; + + do + { + struct other_conv *runp; + struct extra_entry *extra; + + /* Allocate new entry. */ + extra = (struct extra_entry *) cur_extra_table; + cur_extra_table += sizeof (struct extra_entry); + extra->module_cnt = 0; + + runp = &other->other_conv; + do + { + cur_extra_table += sizeof (struct extra_entry_module); + extra->module[extra->module_cnt].outname_offset = + runp->next == NULL + ? other->dest_idx : runp->next->module_idx; + extra->module[extra->module_cnt].dir_offset = + strtaboffset (runp->module->directory_strent); + extra->module[extra->module_cnt].name_offset = + strtaboffset (runp->module->filename_strent); + ++extra->module_cnt; + + runp = runp->next; + } + while (runp != NULL); + + other = other->next; + } + while (other != NULL); + + /* Final module_cnt is zero. */ + *((gidx_t *) cur_extra_table) = 0; + cur_extra_table += sizeof (gidx_t); + } + } + + /* Clear padding. */ + memset (&header, 0, sizeof (struct gconvcache_header)); + + header.magic = GCONVCACHE_MAGIC; + + iov[0].iov_base = &header; + iov[0].iov_len = sizeof (struct gconvcache_header); + total = iov[0].iov_len; + + header.string_offset = total; + iov[1].iov_base = string_table; + iov[1].iov_len = string_table_size; + total += iov[1].iov_len; + + idx = 2; + if ((string_table_size & (sizeof (gidx_t) - 1)) != 0) + { + iov[2].iov_base = (void *) &null_word; + iov[2].iov_len = (sizeof (gidx_t) + - (string_table_size & (sizeof (gidx_t) - 1))); + total += iov[2].iov_len; + ++idx; + } + + header.hash_offset = total; + header.hash_size = hash_size; + iov[idx].iov_base = hash_table; + iov[idx].iov_len = hash_size * sizeof (struct hash_entry); + total += iov[idx].iov_len; + ++idx; + + header.module_offset = total; + iov[idx].iov_base = module_table; + iov[idx].iov_len = nname_info * sizeof (struct module_entry); + total += iov[idx].iov_len; + ++idx; + + assert ((size_t) (cur_extra_table - extra_table) + <= ((sizeof (struct extra_entry) + sizeof (gidx_t) + + sizeof (struct extra_entry_module)) + * nextra_modules)); + header.otherconv_offset = total; + iov[idx].iov_base = extra_table; + iov[idx].iov_len = cur_extra_table - extra_table; + total += iov[idx].iov_len; + ++idx; + + if ((size_t) TEMP_FAILURE_RETRY (writev (fd, iov, idx)) != total + /* The file was created with mode 0600. Make it world-readable. */ + || fchmod (fd, 0644) != 0 + /* Rename the file, possibly replacing an old one. */ + || rename (tmpfname, output_file ?: finalname) != 0) + { + int save_errno = errno; + close (fd); + unlink (tmpfname); + error (EXIT_FAILURE, save_errno, + gettext ("cannot generate output file")); + } + + close (fd); + + return 0; +} |