379 lines
8.7 KiB
C
379 lines
8.7 KiB
C
/* Handle aliases for locale names
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Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
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Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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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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#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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char *getenv ();
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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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# ifndef _GNU_SOURCE
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# define _GNU_SOURCE 1
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# endif
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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)
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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 "gettext.h"
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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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# define strcasecmp __strcasecmp
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#endif
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/* For those loosing 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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/* Nothing has to be done. */
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# define ADD_BLOCK(list, address) /* nothing */
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# define FREE_BLOCKS(list) /* nothing */
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#else
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struct block_list
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{
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void *address;
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struct block_list *next;
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};
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# define ADD_BLOCK(list, addr) \
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do { \
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struct block_list *newp = (struct block_list *) malloc (sizeof (*newp)); \
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/* If we cannot get a free block we cannot add the new element to \
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the list. */ \
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if (newp != NULL) { \
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newp->address = (addr); \
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newp->next = (list); \
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(list) = newp; \
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} \
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} while (0)
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# define FREE_BLOCKS(list) \
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do { \
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while (list != NULL) { \
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struct block_list *old = list; \
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list = list->next; \
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free (old); \
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} \
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} while (0)
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# undef alloca
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# define alloca(size) (malloc (size))
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#endif /* have alloca */
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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 struct alias_map *map;
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static size_t nmap = 0;
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static size_t maxmap = 0;
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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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static void 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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size_t added;
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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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return retval->value;
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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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return NULL;
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}
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static size_t
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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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#ifndef HAVE_ALLOCA
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struct block_list *block_list = NULL;
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#endif
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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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ADD_BLOCK (block_list, full_fname);
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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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fp = fopen (full_fname, "r");
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if (fp == NULL)
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{
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FREE_BLOCKS (block_list);
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return 0;
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}
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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, BUFSIZ, fp) == NULL)
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/* EOF reached. */
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break;
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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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char *tp;
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size_t 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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extend_alias_table ();
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/* We cannot depend on strdup available in the libc. Sigh! */
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len = strlen (alias) + 1;
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tp = (char *) malloc (len);
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if (tp == NULL)
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{
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FREE_BLOCKS (block_list);
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return added;
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}
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memcpy (tp, alias, len);
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map[nmap].alias = tp;
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len = strlen (value) + 1;
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tp = (char *) malloc (len);
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if (tp == NULL)
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{
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FREE_BLOCKS (block_list);
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return added;
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}
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memcpy (tp, value, len);
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map[nmap].value = tp;
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++nmap;
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++added;
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}
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}
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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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while (strchr (cp, '\n') == NULL)
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{
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cp = buf;
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if (fgets (buf, BUFSIZ, 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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*cp = '\n';
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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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FREE_BLOCKS (block_list);
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return added;
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}
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static void
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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 *) malloc (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;
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memcpy (new_map, map, nmap * sizeof (struct alias_map));
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if (maxmap != 0)
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free (map);
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map = new_map;
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maxmap = new_size;
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}
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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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