444 lines
10 KiB
C
444 lines
10 KiB
C
#ifdef MB_CAPABLE
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/* Handle aliases for locale names.
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Copyright (C) 1995-1999, 2000, 2001 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* Tell glibc's <string.h> to provide a prototype for mempcpy().
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This must come before <config.h> because <config.h> may include
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<features.h>, and once <features.h> has been included, it's too late. */
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE 1
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <ctype.h>
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#include <stdio.h>
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#if defined _GLIBC || defined HAVE___FSETLOCKING
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# include <stdio_ext.h>
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#endif
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#include <sys/types.h>
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#ifdef __GNUC__
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# define alloca __builtin_alloca
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# define HAVE_ALLOCA 1
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#else
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# if defined HAVE_ALLOCA_H || defined _LIBC
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# include <alloca.h>
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# else
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# ifdef _AIX
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#pragma alloca
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# else
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# ifndef alloca
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char *alloca ();
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# endif
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# endif
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# endif
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#endif
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#if defined STDC_HEADERS || defined _LIBC
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# include <stdlib.h>
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#else
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# ifdef HAVE_MALLOC_H
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# include <malloc.h>
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# else
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void free ();
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# endif
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#endif
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#if defined HAVE_STRING_H || defined _LIBC
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# include <string.h>
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#else
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# include <strings.h>
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# ifndef memcpy
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# define memcpy(Dst, Src, Num) (bcopy (Src, Dst, Num), (Dst))
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# endif
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#endif
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#if !HAVE_STRCHR && !defined _LIBC
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# ifndef strchr
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# define strchr index
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# endif
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#endif
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#include "gettextP.h"
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/* @@ end of prolog @@ */
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#ifdef _LIBC
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/* Rename the non ANSI C functions. This is required by the standard
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because some ANSI C functions will require linking with this object
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file and the name space must not be polluted. */
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#ifdef _GLIBC
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# define strcasecmp __strcasecmp
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# ifndef mempcpy
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# define mempcpy __mempcpy
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# endif
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# define HAVE_MEMPCPY 1
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# define HAVE___FSETLOCKING 1
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#endif
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/* We need locking here since we can be called from different places. */
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# include <bits/libc-lock.h>
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__libc_lock_define_initialized (static, lock);
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#endif
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#ifndef internal_function
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# define internal_function
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#endif
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/* Some optimizations for glibc. */
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#ifdef _GLIBC
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# define FEOF(fp) feof_unlocked (fp)
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# define FGETS(buf, n, fp) fgets_unlocked (buf, n, fp)
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#else
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# define FEOF(fp) feof (fp)
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# define FGETS(buf, n, fp) fgets (buf, n, fp)
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#endif
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/* For those losing systems which don't have `alloca' we have to add
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some additional code emulating it. */
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#ifdef HAVE_ALLOCA
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# define freea(p) /* nothing */
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#else
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# define alloca(n) malloc (n)
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# define freea(p) free (p)
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#endif
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#if defined _LIBC_REENTRANT || defined HAVE_FGETS_UNLOCKED
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# undef fgets
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# define fgets(buf, len, s) fgets_unlocked (buf, len, s)
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#endif
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#if defined _LIBC_REENTRANT || defined HAVE_FEOF_UNLOCKED
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# undef feof
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# define feof(s) feof_unlocked (s)
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#endif
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struct alias_map
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{
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const char *alias;
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const char *value;
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};
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static char *string_space;
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static size_t string_space_act;
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static size_t string_space_max;
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static struct alias_map *map;
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static size_t nmap;
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static size_t maxmap;
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/* Prototypes for local functions. */
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static size_t read_alias_file PARAMS ((const char *fname, int fname_len))
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internal_function;
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static int extend_alias_table PARAMS ((void));
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static int alias_compare PARAMS ((const struct alias_map *map1,
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const struct alias_map *map2));
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const char *
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_nl_expand_alias (name)
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const char *name;
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{
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static const char *locale_alias_path = LOCALE_ALIAS_PATH;
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struct alias_map *retval;
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const char *result = NULL;
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size_t added;
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#ifdef _LIBC
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__libc_lock_lock (lock);
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#endif
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do
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{
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struct alias_map item;
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item.alias = name;
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if (nmap > 0)
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retval = (struct alias_map *) bsearch (&item, map, nmap,
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sizeof (struct alias_map),
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(int (*) PARAMS ((const void *,
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const void *))
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) alias_compare);
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else
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retval = NULL;
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/* We really found an alias. Return the value. */
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if (retval != NULL)
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{
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result = retval->value;
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break;
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}
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/* Perhaps we can find another alias file. */
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added = 0;
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while (added == 0 && locale_alias_path[0] != '\0')
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{
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const char *start;
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while (locale_alias_path[0] == ':')
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++locale_alias_path;
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start = locale_alias_path;
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while (locale_alias_path[0] != '\0' && locale_alias_path[0] != ':')
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++locale_alias_path;
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if (start < locale_alias_path)
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added = read_alias_file (start, locale_alias_path - start);
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}
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}
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while (added != 0);
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#ifdef _LIBC
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__libc_lock_unlock (lock);
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#endif
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return result;
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}
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static size_t
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internal_function
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read_alias_file (fname, fname_len)
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const char *fname;
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int fname_len;
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{
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FILE *fp;
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char *full_fname;
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size_t added;
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static const char aliasfile[] = "/locale.alias";
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full_fname = (char *) alloca (fname_len + sizeof aliasfile);
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#ifdef HAVE_MEMPCPY
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mempcpy (mempcpy (full_fname, fname, fname_len),
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aliasfile, sizeof aliasfile);
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#else
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memcpy (full_fname, fname, fname_len);
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memcpy (&full_fname[fname_len], aliasfile, sizeof aliasfile);
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#endif
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fp = fopen (full_fname, "r");
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freea (full_fname);
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if (fp == NULL)
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return 0;
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#ifdef HAVE___FSETLOCKING
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/* No threads present. */
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__fsetlocking (fp, FSETLOCKING_BYCALLER);
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#endif
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added = 0;
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while (!FEOF (fp))
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{
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/* It is a reasonable approach to use a fix buffer here because
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a) we are only interested in the first two fields
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b) these fields must be usable as file names and so must not
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be that long
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*/
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char buf[BUFSIZ];
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char *alias;
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char *value;
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char *cp;
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if (FGETS (buf, sizeof buf, fp) == NULL)
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/* EOF reached. */
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break;
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/* Possibly not the whole line fits into the buffer. Ignore
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the rest of the line. */
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if (strchr (buf, '\n') == NULL)
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{
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char altbuf[BUFSIZ];
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do
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if (FGETS (altbuf, sizeof altbuf, fp) == NULL)
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/* Make sure the inner loop will be left. The outer loop
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will exit at the `feof' test. */
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break;
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while (strchr (altbuf, '\n') == NULL);
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}
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cp = buf;
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/* Ignore leading white space. */
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while (isspace (cp[0]))
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++cp;
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/* A leading '#' signals a comment line. */
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if (cp[0] != '\0' && cp[0] != '#')
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{
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alias = cp++;
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while (cp[0] != '\0' && !isspace (cp[0]))
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++cp;
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/* Terminate alias name. */
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if (cp[0] != '\0')
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*cp++ = '\0';
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/* Now look for the beginning of the value. */
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while (isspace (cp[0]))
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++cp;
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if (cp[0] != '\0')
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{
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size_t alias_len;
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size_t value_len;
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value = cp++;
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while (cp[0] != '\0' && !isspace (cp[0]))
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++cp;
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/* Terminate value. */
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if (cp[0] == '\n')
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{
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/* This has to be done to make the following test
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for the end of line possible. We are looking for
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the terminating '\n' which do not overwrite here. */
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*cp++ = '\0';
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*cp = '\n';
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}
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else if (cp[0] != '\0')
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*cp++ = '\0';
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if (nmap >= maxmap)
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if (__builtin_expect (extend_alias_table (), 0))
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return added;
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alias_len = strlen (alias) + 1;
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value_len = strlen (value) + 1;
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if (string_space_act + alias_len + value_len > string_space_max)
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{
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/* Increase size of memory pool. */
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size_t new_size = (string_space_max
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+ (alias_len + value_len > 1024
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? alias_len + value_len : 1024));
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char *new_pool = (char *) realloc (string_space, new_size);
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if (new_pool == NULL)
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return added;
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if (__builtin_expect (string_space != new_pool, 0))
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{
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size_t i;
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for (i = 0; i < nmap; i++)
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{
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map[i].alias += new_pool - string_space;
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map[i].value += new_pool - string_space;
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}
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}
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string_space = new_pool;
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string_space_max = new_size;
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}
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map[nmap].alias = memcpy (&string_space[string_space_act],
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alias, alias_len);
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string_space_act += alias_len;
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map[nmap].value = memcpy (&string_space[string_space_act],
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value, value_len);
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string_space_act += value_len;
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++nmap;
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++added;
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}
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}
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}
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/* Should we test for ferror()? I think we have to silently ignore
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errors. --drepper */
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fclose (fp);
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if (added > 0)
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qsort (map, nmap, sizeof (struct alias_map),
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(int (*) PARAMS ((const void *, const void *))) alias_compare);
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return added;
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}
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static int
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extend_alias_table ()
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{
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size_t new_size;
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struct alias_map *new_map;
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new_size = maxmap == 0 ? 100 : 2 * maxmap;
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new_map = (struct alias_map *) realloc (map, (new_size
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* sizeof (struct alias_map)));
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if (new_map == NULL)
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/* Simply don't extend: we don't have any more core. */
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return -1;
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map = new_map;
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maxmap = new_size;
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return 0;
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}
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#ifdef _LIBC
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static void __attribute__ ((unused))
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free_mem (void)
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{
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if (string_space != NULL)
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free (string_space);
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if (map != NULL)
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free (map);
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}
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text_set_element (__libc_subfreeres, free_mem);
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#endif
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static int
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alias_compare (map1, map2)
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const struct alias_map *map1;
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const struct alias_map *map2;
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{
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#if defined _LIBC || defined HAVE_STRCASECMP
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return strcasecmp (map1->alias, map2->alias);
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#else
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const unsigned char *p1 = (const unsigned char *) map1->alias;
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const unsigned char *p2 = (const unsigned char *) map2->alias;
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unsigned char c1, c2;
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if (p1 == p2)
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return 0;
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do
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{
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/* I know this seems to be odd but the tolower() function in
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some systems libc cannot handle nonalpha characters. */
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c1 = isupper (*p1) ? tolower (*p1) : *p1;
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c2 = isupper (*p2) ? tolower (*p2) : *p2;
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if (c1 == '\0')
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break;
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++p1;
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++p2;
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}
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while (c1 == c2);
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return c1 - c2;
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#endif
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}
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#endif /* MB_CAPABLE */
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