diff options
Diffstat (limited to 'iconv/gconv_conf.c')
| -rw-r--r-- | iconv/gconv_conf.c | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/iconv/gconv_conf.c b/iconv/gconv_conf.c new file mode 100644 index 0000000000..d3c13d75c9 --- /dev/null +++ b/iconv/gconv_conf.c @@ -0,0 +1,420 @@ +/* Handle configuration data. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <ctype.h> +#include <gconv.h> +#include <search.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sys/param.h> + + +/* This is the default path where we look for module lists. */ +static const char default_gconv_path[] = GCONV_PATH; + +/* Name of the file containing the module information in the directories + along the path. */ +static const char gconv_conf_filename[] = "gconv-modules"; + +/* We have a few builtin transformations. */ +static struct gconv_module builtin_modules[] = +{ +#define BUILTIN_TRANSFORMATION(From, ConstPfx, ConstLen, To, Cost, Name, \ + Fct, Init, End) \ + { \ + from_pattern: From, \ + from_constpfx: ConstPfx, \ + from_constpfx_len: ConstLen, \ + from_regex: NULL, \ + to_string: To, \ + cost: Cost, \ + module_name: Name \ + }, + +#include "gconv_builtin.h" +}; + + +/* Function for searching module. */ +static int +module_compare (const void *p1, const void *p2) +{ + struct gconv_module *s1 = (struct gconv_module *) p1; + struct gconv_module *s2 = (struct gconv_module *) p2; + int result; + + if (s1->from_pattern == NULL) + { + if (s2->from_pattern == NULL) + result = strcmp (s1->from_constpfx, s2->from_constpfx); + else + result = -1; + } + else if (s2->from_pattern == NULL) + result = 1; + else + result = strcmp (s1->from_pattern, s2->from_pattern); + + if (result == 0) + result = strcmp (s1->to_string, s2->to_string); + + return result; +} + + +/* Add new alias. */ +static inline 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. */ + struct gconv_alias *new_alias; + char *from, *to, *wp; + + while (isspace (*rp)) + ++rp; + from = wp = rp; + while (*rp != '\0' && !isspace (*rp)) + ++rp; + if (*rp == '\0') + /* There is no `to' string on the line. Ignore it. */ + return; + *rp++ = '\0'; + to = wp = rp; + while (isspace (*rp)) + ++rp; + while (*rp != '\0' && !isspace (*rp)) + *wp++ = *rp++; + if (to == wp) + /* No `to' string, ignore the line. */ + return; + *wp++ = '\0'; + + new_alias = (struct gconv_alias *) + malloc (sizeof (struct gconv_alias) + (wp - from)); + new_alias->fromname = memcpy ((char *) new_alias + + sizeof (struct gconv_alias), + from, to - from); + new_alias->toname = memcpy ((char *) new_alias + sizeof (struct gconv_alias) + + (to - from), to, wp - to); + + if (__tsearch (new_alias, &__gconv_alias_db, __gconv_alias_compare) == NULL) + /* Something went wrong, free this entry. */ + free (new_alias); +} + + +/* Add new module. */ +static inline void +add_module (char *rp, const char *directory, size_t dir_len, void **modules, + size_t *nmodules) +{ + /* We expect now + 1. `from' name + 2. `to' name + 3. filename of the module + 4. an optional cost value + */ + struct gconv_module *new_module; + char *from, *to, *module, *wp; + size_t const_len; + int from_is_regex; + int cost; + + while (isspace (*rp)) + ++rp; + from = rp; + from_is_regex = 0; + while (*rp != '\0' && !isspace (*rp)) + { + if (!isalnum (*rp) && *rp != '-' && *rp != '/' && *rp != '.' + && *rp != '_') + from_is_regex = 1; + ++rp; + } + if (*rp == '\0') + return; + *rp++ = '\0'; + to = wp = rp; + while (isspace (*rp)) + ++rp; + while (*rp != '\0' && !isspace (*rp)) + *wp++ = *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) + /* No useful information. */ + cost = 1; + } + + if (module[0] == '\0') + /* No module name given. */ + return; + if (module[0] == '/') + dir_len = 0; + else + /* Increment by one for the slash. */ + ++dir_len; + + /* We've collected all the information, now create an entry. */ + + const_len = 0; + if (from_is_regex) + do + ++const_len; + while (isalnum (from[const_len]) || from[const_len] == '-' + || from[const_len] == '/' || from[const_len] == '.' + || from[const_len] == '_'); + + new_module = (struct gconv_module *) malloc (sizeof (struct gconv_module) + + (wp - from) + const_len + + dir_len); + if (new_module != NULL) + { + if (from_is_regex) + { + new_module->from_pattern = memcpy ((char *) new_module + + sizeof (struct gconv_module), + from, to - from); + new_module->from_constpfx = memcpy ((char *) new_module->from_pattern + + (to - from), + from, const_len); + ((char *) new_module->from_constpfx)[const_len] = '\0'; + new_module->from_constpfx_len = const_len; + ++const_len; + } + else + { + new_module->from_pattern = NULL; + new_module->from_constpfx = memcpy ((char *) new_module + + sizeof (struct gconv_module), + from, to - from); + new_module->from_constpfx_len = to - from - 1; + const_len = to - from; + } + new_module->from_regex = NULL; + + new_module->to_string = memcpy ((char *) new_module->from_constpfx + + const_len + 1, to, module - to); + + new_module->cost = cost; + + if (dir_len == 0) + new_module->module_name = memcpy ((char *) new_module->to_string + + (module - to), + module, wp - module); + else + { + char *tmp; + new_module->module_name = ((char *) new_module->to_string + + (module - to)); + tmp = __mempcpy ((char *) new_module->module_name, + directory, dir_len - 1); + *tmp++ = '/'; + memcpy (tmp, module, wp - module); + } + + if (__tfind (new_module, *modules, module_compare) != NULL) + if (__tsearch (new_module, modules, module_compare) == NULL) + /* Something went wrong while inserting the new module. */ + free (new_module); + else + ++*nmodules; + } +} + + +static void +insert_module (const void *nodep, VISIT value, int level) +{ + if (value == preorder || value == leaf) + __gconv_modules_db[__gconv_nmodules++] = (struct gconv_module *) nodep; +} + +static void +nothing (void *unused __attribute__ ((unused))) +{ +} + + +/* Read the next configuration file. */ +static void +internal_function +read_conf_file (const char *filename, const char *directory, size_t dir_len, + void **modules, size_t *nmodules) +{ + FILE *fp = fopen (filename, "r"); + char *line = NULL; + size_t line_len = 0; + + /* Don't complain if a file is not present or readable, simply silently + ignore it. */ + if (fp == NULL) + return; + + /* Process the known entries of the file. Comments start with `#' and + end with the end of the line. Empty lines are ignored. */ + while (!feof (fp)) + { + char *rp, *endp, *word; + ssize_t n = __getdelim (&line, &line_len, '\n', fp); + if (n < 0) + /* An error occurred. */ + break; + + rp = line; + while (isspace (*rp)) + ++rp; + /* Terminate the line (excluding comments or newline) by an NUL byte + to simplify the following code. */ + endp = strchr (rp, '#'); + if (endp != NULL) + *endp = '\0'; + else + { + endp = strchr (rp, '\n'); + if (endp != NULL) + *endp = '\0'; + } + + /* 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 + && memcpy (word, "alias", sizeof ("alias") - 1) == 0) + add_alias (rp); + else if (rp - word == sizeof ("module") - 1 + && memcpy (word, "module", sizeof ("module") - 1) == 0) + add_module (rp, directory, dir_len, modules, nmodules); + /* else */ + /* Otherwise ignore the line. */ + } + + if (line != NULL) + free (line); + fclose (fp); +} + + +/* Read all configuration files found in the user-specified and the default + path. */ +void +__gconv_read_conf (void) +{ + const char *user_path = __secure_getenv ("GCONV_PATH"); + char *gconv_path, *elem; + void *modules = NULL; + size_t nmodules = 0; + + if (user_path == NULL) + /* No user-defined path. Make a modifiable copy of the default path. */ + gconv_path = strdupa (default_gconv_path); + else + { + /* Append the default path to the user-defined path. */ + size_t user_len = strlen (user_path); + char *tmp; + + gconv_path = alloca (user_len + 1 + sizeof (default_gconv_path)); + tmp = __mempcpy (gconv_path, user_path, user_len); + *tmp++ = ':'; + __mempcpy (tmp, default_gconv_path, sizeof (default_gconv_path)); + } + + elem = strtok_r (gconv_path, ":", &gconv_path); + while (elem != NULL) + { + char real_elem[MAXPATHLEN]; + + if (realpath (elem, real_elem) != NULL) + { + size_t elem_len = strlen (real_elem); + char *filename, *tmp; + + filename = alloca (elem_len + 1 + sizeof (gconv_conf_filename)); + tmp = __mempcpy (filename, real_elem, elem_len); + *tmp++ = '/'; + __mempcpy (tmp, gconv_conf_filename, sizeof (gconv_conf_filename)); + + /* Read the next configuration file. */ + read_conf_file (filename, real_elem, elem_len, &modules, &nmodules); + } + + /* Get next element in the path. */ + elem = strtok_r (NULL, ":", &gconv_path); + } + + /* If the configuration files do not contain any valid module specification + remember this by setting the pointer to the module array to NULL. */ + nmodules = sizeof (builtin_modules) / sizeof (struct gconv_module); + if (nmodules == 0) + { + __gconv_modules_db = NULL; + return; + } + + __gconv_modules_db = + (struct gconv_module **) malloc (nmodules * sizeof (struct gconv_module)); + if (__gconv_modules_db == NULL) + /* We cannot do anything. */ + return; + + /* First insert the builtin transformations. */ + while (__gconv_nmodules < (sizeof (builtin_modules) + / sizeof (struct gconv_module))) + { + __gconv_modules_db[__gconv_nmodules] = + &builtin_modules[__gconv_nmodules]; + ++__gconv_nmodules; + } + + /* Insert all module entries into the array. */ + __twalk (modules, insert_module); + + /* No remove the tree data structure. */ + __tdestroy (modules, nothing); +} |