source: trunk/src/sed/intl/localealias.c@ 2310

Last change on this file since 2310 was 599, checked in by bird, 19 years ago

GNU sed 4.1.5.
File size: 9.7 KB
Line 
1/* Handle aliases for locale names.
2 Copyright (C) 1995-1999, 2000, 2001 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU Library General Public License as published
6 by the Free Software Foundation; either version 2, or (at your option)
7 any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
13
14 You should have received a copy of the GNU Library General Public
15 License along with this program; if not, write to the Free Software
16 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
17 USA. */
18
19/* Tell glibc's <string.h> to provide a prototype for mempcpy().
20 This must come before <config.h> because <config.h> may include
21 <features.h>, and once <features.h> has been included, it's too late. */
22#ifndef _GNU_SOURCE
23# define _GNU_SOURCE 1
24#endif
25
26#ifdef HAVE_CONFIG_H
27# include <config.h>
28#endif
29
30#include <ctype.h>
31#include <stdio.h>
32#if defined _LIBC || defined HAVE___FSETLOCKING
33# include <stdio_ext.h>
34#endif
35#include <sys/types.h>
36
37#ifdef __GNUC__
38# define alloca __builtin_alloca
39# define HAVE_ALLOCA 1
40#else
41# if defined HAVE_ALLOCA_H || defined _LIBC
42# include <alloca.h>
43# else
44# ifdef _AIX
45 #pragma alloca
46# else
47# ifndef alloca
48char *alloca ();
49# endif
50# endif
51# endif
52#endif
53
54#include <stdlib.h>
55#include <string.h>
56
57#include "gettextP.h"
58
59/* @@ end of prolog @@ */
60
61#ifdef _LIBC
62/* Rename the non ANSI C functions. This is required by the standard
63 because some ANSI C functions will require linking with this object
64 file and the name space must not be polluted. */
65# define strcasecmp __strcasecmp
66
67# ifndef mempcpy
68# define mempcpy __mempcpy
69# endif
70# define HAVE_MEMPCPY 1
71# define HAVE___FSETLOCKING 1
72
73/* We need locking here since we can be called from different places. */
74# include <bits/libc-lock.h>
75
76__libc_lock_define_initialized (static, lock);
77#endif
78
79#ifndef internal_function
80# define internal_function
81#endif
82
83/* Some optimizations for glibc. */
84#ifdef _LIBC
85# define FEOF(fp) feof_unlocked (fp)
86# define FGETS(buf, n, fp) fgets_unlocked (buf, n, fp)
87#else
88# define FEOF(fp) feof (fp)
89# define FGETS(buf, n, fp) fgets (buf, n, fp)
90#endif
91
92/* For those losing systems which don't have `alloca' we have to add
93 some additional code emulating it. */
94#ifdef HAVE_ALLOCA
95# define freea(p) /* nothing */
96#else
97# define alloca(n) malloc (n)
98# define freea(p) free (p)
99#endif
100
101#if defined _LIBC_REENTRANT || defined HAVE_FGETS_UNLOCKED
102# undef fgets
103# define fgets(buf, len, s) fgets_unlocked (buf, len, s)
104#endif
105#if defined _LIBC_REENTRANT || defined HAVE_FEOF_UNLOCKED
106# undef feof
107# define feof(s) feof_unlocked (s)
108#endif
109
110
111struct alias_map
112{
113 const char *alias;
114 const char *value;
115};
116
117
118static char *string_space;
119static size_t string_space_act;
120static size_t string_space_max;
121static struct alias_map *map;
122static size_t nmap;
123static size_t maxmap;
124
125
126/* Prototypes for local functions. */
127static size_t read_alias_file PARAMS ((const char *fname, int fname_len))
128 internal_function;
129static int extend_alias_table PARAMS ((void));
130static int alias_compare PARAMS ((const struct alias_map *map1,
131 const struct alias_map *map2));
132
133
134const char *
135_nl_expand_alias (name)
136 const char *name;
137{
138 static const char *locale_alias_path;
139 struct alias_map *retval;
140 const char *result = NULL;
141 size_t added;
142
143#ifdef _LIBC
144 __libc_lock_lock (lock);
145#endif
146
147 if (locale_alias_path == NULL)
148 locale_alias_path = LOCALE_ALIAS_PATH;
149
150 do
151 {
152 struct alias_map item;
153
154 item.alias = name;
155
156 if (nmap > 0)
157 retval = (struct alias_map *) bsearch (&item, map, nmap,
158 sizeof (struct alias_map),
159 (int (*) PARAMS ((const void *,
160 const void *))
161 ) alias_compare);
162 else
163 retval = NULL;
164
165 /* We really found an alias. Return the value. */
166 if (retval != NULL)
167 {
168 result = retval->value;
169 break;
170 }
171
172 /* Perhaps we can find another alias file. */
173 added = 0;
174 while (added == 0 && locale_alias_path[0] != '\0')
175 {
176 const char *start;
177
178 while (locale_alias_path[0] == PATH_SEPARATOR)
179 ++locale_alias_path;
180 start = locale_alias_path;
181
182 while (locale_alias_path[0] != '\0'
183 && locale_alias_path[0] != PATH_SEPARATOR)
184 ++locale_alias_path;
185
186 if (start < locale_alias_path)
187 added = read_alias_file (start, locale_alias_path - start);
188 }
189 }
190 while (added != 0);
191
192#ifdef _LIBC
193 __libc_lock_unlock (lock);
194#endif
195
196 return result;
197}
198
199
200static size_t
201internal_function
202read_alias_file (fname, fname_len)
203 const char *fname;
204 int fname_len;
205{
206 FILE *fp;
207 char *full_fname;
208 size_t added;
209 static const char aliasfile[] = "/locale.alias";
210
211 full_fname = (char *) alloca (fname_len + sizeof aliasfile);
212#ifdef HAVE_MEMPCPY
213 mempcpy (mempcpy (full_fname, fname, fname_len),
214 aliasfile, sizeof aliasfile);
215#else
216 memcpy (full_fname, fname, fname_len);
217 memcpy (&full_fname[fname_len], aliasfile, sizeof aliasfile);
218#endif
219
220 fp = fopen (full_fname, "r");
221 freea (full_fname);
222 if (fp == NULL)
223 return 0;
224
225#ifdef HAVE___FSETLOCKING
226 /* No threads present. */
227 __fsetlocking (fp, FSETLOCKING_BYCALLER);
228#endif
229
230 added = 0;
231 while (!FEOF (fp))
232 {
233 /* It is a reasonable approach to use a fix buffer here because
234 a) we are only interested in the first two fields
235 b) these fields must be usable as file names and so must not
236 be that long
237 */
238 char buf[BUFSIZ];
239 char *alias;
240 char *value;
241 char *cp;
242
243 if (FGETS (buf, sizeof buf, fp) == NULL)
244 /* EOF reached. */
245 break;
246
247 /* Possibly not the whole line fits into the buffer. Ignore
248 the rest of the line. */
249 if (strchr (buf, '\n') == NULL)
250 {
251 char altbuf[BUFSIZ];
252 do
253 if (FGETS (altbuf, sizeof altbuf, fp) == NULL)
254 /* Make sure the inner loop will be left. The outer loop
255 will exit at the `feof' test. */
256 break;
257 while (strchr (altbuf, '\n') == NULL);
258 }
259
260 cp = buf;
261 /* Ignore leading white space. */
262 while (isspace ((unsigned char) cp[0]))
263 ++cp;
264
265 /* A leading '#' signals a comment line. */
266 if (cp[0] != '\0' && cp[0] != '#')
267 {
268 alias = cp++;
269 while (cp[0] != '\0' && !isspace ((unsigned char) cp[0]))
270 ++cp;
271 /* Terminate alias name. */
272 if (cp[0] != '\0')
273 *cp++ = '\0';
274
275 /* Now look for the beginning of the value. */
276 while (isspace ((unsigned char) cp[0]))
277 ++cp;
278
279 if (cp[0] != '\0')
280 {
281 size_t alias_len;
282 size_t value_len;
283
284 value = cp++;
285 while (cp[0] != '\0' && !isspace ((unsigned char) cp[0]))
286 ++cp;
287 /* Terminate value. */
288 if (cp[0] == '\n')
289 {
290 /* This has to be done to make the following test
291 for the end of line possible. We are looking for
292 the terminating '\n' which do not overwrite here. */
293 *cp++ = '\0';
294 *cp = '\n';
295 }
296 else if (cp[0] != '\0')
297 *cp++ = '\0';
298
299 if (nmap >= maxmap)
300 if (__builtin_expect (extend_alias_table (), 0))
301 return added;
302
303 alias_len = strlen (alias) + 1;
304 value_len = strlen (value) + 1;
305
306 if (string_space_act + alias_len + value_len > string_space_max)
307 {
308 /* Increase size of memory pool. */
309 size_t new_size = (string_space_max
310 + (alias_len + value_len > 1024
311 ? alias_len + value_len : 1024));
312 char *new_pool = (char *) realloc (string_space, new_size);
313 if (new_pool == NULL)
314 return added;
315
316 if (__builtin_expect (string_space != new_pool, 0))
317 {
318 size_t i;
319
320 for (i = 0; i < nmap; i++)
321 {
322 map[i].alias += new_pool - string_space;
323 map[i].value += new_pool - string_space;
324 }
325 }
326
327 string_space = new_pool;
328 string_space_max = new_size;
329 }
330
331 map[nmap].alias = memcpy (&string_space[string_space_act],
332 alias, alias_len);
333 string_space_act += alias_len;
334
335 map[nmap].value = memcpy (&string_space[string_space_act],
336 value, value_len);
337 string_space_act += value_len;
338
339 ++nmap;
340 ++added;
341 }
342 }
343 }
344
345 /* Should we test for ferror()? I think we have to silently ignore
346 errors. --drepper */
347 fclose (fp);
348
349 if (added > 0)
350 qsort (map, nmap, sizeof (struct alias_map),
351 (int (*) PARAMS ((const void *, const void *))) alias_compare);
352
353 return added;
354}
355
356
357static int
358extend_alias_table ()
359{
360 size_t new_size;
361 struct alias_map *new_map;
362
363 new_size = maxmap == 0 ? 100 : 2 * maxmap;
364 new_map = (struct alias_map *) realloc (map, (new_size
365 * sizeof (struct alias_map)));
366 if (new_map == NULL)
367 /* Simply don't extend: we don't have any more core. */
368 return -1;
369
370 map = new_map;
371 maxmap = new_size;
372 return 0;
373}
374
375
376#ifdef _LIBC
377static void __attribute__ ((unused))
378free_mem (void)
379{
380 if (string_space != NULL)
381 free (string_space);
382 if (map != NULL)
383 free (map);
384}
385text_set_element (__libc_subfreeres, free_mem);
386#endif
387
388
389static int
390alias_compare (map1, map2)
391 const struct alias_map *map1;
392 const struct alias_map *map2;
393{
394#if defined _LIBC || defined HAVE_STRCASECMP
395 return strcasecmp (map1->alias, map2->alias);
396#else
397 const unsigned char *p1 = (const unsigned char *) map1->alias;
398 const unsigned char *p2 = (const unsigned char *) map2->alias;
399 unsigned char c1, c2;
400
401 if (p1 == p2)
402 return 0;
403
404 do
405 {
406 /* I know this seems to be odd but the tolower() function in
407 some systems libc cannot handle nonalpha characters. */
408 c1 = isupper (*p1) ? tolower (*p1) : *p1;
409 c2 = isupper (*p2) ? tolower (*p2) : *p2;
410 if (c1 == '\0')
411 break;
412 ++p1;
413 ++p2;
414 }
415 while (c1 == c2);
416
417 return c1 - c2;
418#endif
419}
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