diff options
Diffstat (limited to 'intl/localealias.c')
| -rw-r--r-- | intl/localealias.c | 419 |
1 files changed, 419 insertions, 0 deletions
diff --git a/intl/localealias.c b/intl/localealias.c new file mode 100644 index 0000000..7c4ce58 --- /dev/null +++ b/intl/localealias.c @@ -0,0 +1,419 @@ +/* Handle aliases for locale names. + Copyright (C) 1995-1999, 2000-2001, 2003 Free Software Foundation, Inc. + + This program 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, 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, + USA. */ + +/* Tell glibc's <string.h> to provide a prototype for mempcpy(). + This must come before <config.h> because <config.h> may include + <features.h>, and once <features.h> has been included, it's too late. */ +#ifndef _GNU_SOURCE +# define _GNU_SOURCE 1 +#endif + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <ctype.h> +#include <stdio.h> +#if defined _LIBC || defined HAVE___FSETLOCKING +# include <stdio_ext.h> +#endif +#include <sys/types.h> + +#ifdef __GNUC__ +# undef alloca +# define alloca __builtin_alloca +# define HAVE_ALLOCA 1 +#else +# ifdef _MSC_VER +# include <malloc.h> +# define alloca _alloca +# else +# if defined HAVE_ALLOCA_H || defined _LIBC +# include <alloca.h> +# else +# ifdef _AIX + #pragma alloca +# else +# ifndef alloca +char *alloca (); +# endif +# endif +# endif +# endif +#endif + +#include <stdlib.h> +#include <string.h> + +#include "gettextP.h" + +#if ENABLE_RELOCATABLE +# include "relocatable.h" +#else +# define relocate(pathname) (pathname) +#endif + +/* @@ end of prolog @@ */ + +#ifdef _LIBC +/* Rename the non ANSI C functions. This is required by the standard + because some ANSI C functions will require linking with this object + file and the name space must not be polluted. */ +# define strcasecmp __strcasecmp + +# ifndef mempcpy +# define mempcpy __mempcpy +# endif +# define HAVE_MEMPCPY 1 +# define HAVE___FSETLOCKING 1 + +/* We need locking here since we can be called from different places. */ +# include <bits/libc-lock.h> + +__libc_lock_define_initialized (static, lock); +#endif + +#ifndef internal_function +# define internal_function +#endif + +/* Some optimizations for glibc. */ +#ifdef _LIBC +# define FEOF(fp) feof_unlocked (fp) +# define FGETS(buf, n, fp) fgets_unlocked (buf, n, fp) +#else +# define FEOF(fp) feof (fp) +# define FGETS(buf, n, fp) fgets (buf, n, fp) +#endif + +/* For those losing systems which don't have `alloca' we have to add + some additional code emulating it. */ +#ifdef HAVE_ALLOCA +# define freea(p) /* nothing */ +#else +# define alloca(n) malloc (n) +# define freea(p) free (p) +#endif + +#if defined _LIBC_REENTRANT || defined HAVE_FGETS_UNLOCKED +# undef fgets +# define fgets(buf, len, s) fgets_unlocked (buf, len, s) +#endif +#if defined _LIBC_REENTRANT || defined HAVE_FEOF_UNLOCKED +# undef feof +# define feof(s) feof_unlocked (s) +#endif + + +struct alias_map +{ + const char *alias; + const char *value; +}; + + +#ifndef _LIBC +# define libc_freeres_ptr(decl) decl +#endif + +libc_freeres_ptr (static char *string_space); +static size_t string_space_act; +static size_t string_space_max; +libc_freeres_ptr (static struct alias_map *map); +static size_t nmap; +static size_t maxmap; + + +/* Prototypes for local functions. */ +static size_t read_alias_file PARAMS ((const char *fname, int fname_len)) + internal_function; +static int extend_alias_table PARAMS ((void)); +static int alias_compare PARAMS ((const struct alias_map *map1, + const struct alias_map *map2)); + + +const char * +_nl_expand_alias (name) + const char *name; +{ + static const char *locale_alias_path; + struct alias_map *retval; + const char *result = NULL; + size_t added; + +#ifdef _LIBC + __libc_lock_lock (lock); +#endif + + if (locale_alias_path == NULL) + locale_alias_path = LOCALE_ALIAS_PATH; + + do + { + struct alias_map item; + + item.alias = name; + + if (nmap > 0) + retval = (struct alias_map *) bsearch (&item, map, nmap, + sizeof (struct alias_map), + (int (*) PARAMS ((const void *, + const void *)) + ) alias_compare); + else + retval = NULL; + + /* We really found an alias. Return the value. */ + if (retval != NULL) + { + result = retval->value; + break; + } + + /* Perhaps we can find another alias file. */ + added = 0; + while (added == 0 && locale_alias_path[0] != '\0') + { + const char *start; + + while (locale_alias_path[0] == PATH_SEPARATOR) + ++locale_alias_path; + start = locale_alias_path; + + while (locale_alias_path[0] != '\0' + && locale_alias_path[0] != PATH_SEPARATOR) + ++locale_alias_path; + + if (start < locale_alias_path) + added = read_alias_file (start, locale_alias_path - start); + } + } + while (added != 0); + +#ifdef _LIBC + __libc_lock_unlock (lock); +#endif + + return result; +} + + +static size_t +internal_function +read_alias_file (fname, fname_len) + const char *fname; + int fname_len; +{ + FILE *fp; + char *full_fname; + size_t added; + static const char aliasfile[] = "/locale.alias"; + + full_fname = (char *) alloca (fname_len + sizeof aliasfile); +#ifdef HAVE_MEMPCPY + mempcpy (mempcpy (full_fname, fname, fname_len), + aliasfile, sizeof aliasfile); +#else + memcpy (full_fname, fname, fname_len); + memcpy (&full_fname[fname_len], aliasfile, sizeof aliasfile); +#endif + + fp = fopen (relocate (full_fname), "r"); + freea (full_fname); + if (fp == NULL) + return 0; + +#ifdef HAVE___FSETLOCKING + /* No threads present. */ + __fsetlocking (fp, FSETLOCKING_BYCALLER); +#endif + + added = 0; + while (!FEOF (fp)) + { + /* It is a reasonable approach to use a fix buffer here because + a) we are only interested in the first two fields + b) these fields must be usable as file names and so must not + be that long + We avoid a multi-kilobyte buffer here since this would use up + stack space which we might not have if the program ran out of + memory. */ + char buf[400]; + char *alias; + char *value; + char *cp; + + if (FGETS (buf, sizeof buf, fp) == NULL) + /* EOF reached. */ + break; + + cp = buf; + /* Ignore leading white space. */ + while (isspace ((unsigned char) cp[0])) + ++cp; + + /* A leading '#' signals a comment line. */ + if (cp[0] != '\0' && cp[0] != '#') + { + alias = cp++; + while (cp[0] != '\0' && !isspace ((unsigned char) cp[0])) + ++cp; + /* Terminate alias name. */ + if (cp[0] != '\0') + *cp++ = '\0'; + + /* Now look for the beginning of the value. */ + while (isspace ((unsigned char) cp[0])) + ++cp; + + if (cp[0] != '\0') + { + size_t alias_len; + size_t value_len; + + value = cp++; + while (cp[0] != '\0' && !isspace ((unsigned char) cp[0])) + ++cp; + /* Terminate value. */ + if (cp[0] == '\n') + { + /* This has to be done to make the following test + for the end of line possible. We are looking for + the terminating '\n' which do not overwrite here. */ + *cp++ = '\0'; + *cp = '\n'; + } + else if (cp[0] != '\0') + *cp++ = '\0'; + + if (nmap >= maxmap) + if (__builtin_expect (extend_alias_table (), 0)) + return added; + + alias_len = strlen (alias) + 1; + value_len = strlen (value) + 1; + + if (string_space_act + alias_len + value_len > string_space_max) + { + /* Increase size of memory pool. */ + size_t new_size = (string_space_max + + (alias_len + value_len > 1024 + ? alias_len + value_len : 1024)); + char *new_pool = (char *) realloc (string_space, new_size); + if (new_pool == NULL) + return added; + + if (__builtin_expect (string_space != new_pool, 0)) + { + size_t i; + + for (i = 0; i < nmap; i++) + { + map[i].alias += new_pool - string_space; + map[i].value += new_pool - string_space; + } + } + + string_space = new_pool; + string_space_max = new_size; + } + + map[nmap].alias = memcpy (&string_space[string_space_act], + alias, alias_len); + string_space_act += alias_len; + + map[nmap].value = memcpy (&string_space[string_space_act], + value, value_len); + string_space_act += value_len; + + ++nmap; + ++added; + } + } + + /* Possibly not the whole line fits into the buffer. Ignore + the rest of the line. */ + while (strchr (buf, '\n') == NULL) + if (FGETS (buf, sizeof buf, fp) == NULL) + /* Make sure the inner loop will be left. The outer loop + will exit at the `feof' test. */ + break; + } + + /* Should we test for ferror()? I think we have to silently ignore + errors. --drepper */ + fclose (fp); + + if (added > 0) + qsort (map, nmap, sizeof (struct alias_map), + (int (*) PARAMS ((const void *, const void *))) alias_compare); + + return added; +} + + +static int +extend_alias_table () +{ + size_t new_size; + struct alias_map *new_map; + + new_size = maxmap == 0 ? 100 : 2 * maxmap; + new_map = (struct alias_map *) realloc (map, (new_size + * sizeof (struct alias_map))); + if (new_map == NULL) + /* Simply don't extend: we don't have any more core. */ + return -1; + + map = new_map; + maxmap = new_size; + return 0; +} + + +static int +alias_compare (map1, map2) + const struct alias_map *map1; + const struct alias_map *map2; +{ +#if defined _LIBC || defined HAVE_STRCASECMP + return strcasecmp (map1->alias, map2->alias); +#else + const unsigned char *p1 = (const unsigned char *) map1->alias; + const unsigned char *p2 = (const unsigned char *) map2->alias; + unsigned char c1, c2; + + if (p1 == p2) + return 0; + + do + { + /* I know this seems to be odd but the tolower() function in + some systems libc cannot handle nonalpha characters. */ + c1 = isupper (*p1) ? tolower (*p1) : *p1; + c2 = isupper (*p2) ? tolower (*p2) : *p2; + if (c1 == '\0') + break; + ++p1; + ++p2; + } + while (c1 == c2); + + return c1 - c2; +#endif +} |