Theodore Ts'o | 5bc5a89 | 2000-02-08 20:20:46 +0000 | [diff] [blame^] | 1 | /* Handle aliases for locale names. |
| 2 | Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. |
| 3 | Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. |
| 4 | |
| 5 | This program is free software; you can redistribute it and/or modify |
| 6 | it under the terms of the GNU General Public License as published by |
| 7 | the Free Software Foundation; either version 2, or (at your option) |
| 8 | any later version. |
| 9 | |
| 10 | This program is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | GNU General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU General Public License |
| 16 | along with this program; if not, write to the Free Software Foundation, |
| 17 | Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 18 | |
| 19 | #ifdef HAVE_CONFIG_H |
| 20 | # include <config.h> |
| 21 | #endif |
| 22 | |
| 23 | #include <ctype.h> |
| 24 | #include <stdio.h> |
| 25 | #include <sys/types.h> |
| 26 | |
| 27 | #ifdef __GNUC__ |
| 28 | # define alloca __builtin_alloca |
| 29 | # define HAVE_ALLOCA 1 |
| 30 | #else |
| 31 | # if defined HAVE_ALLOCA_H || defined _LIBC |
| 32 | # include <alloca.h> |
| 33 | # else |
| 34 | # ifdef _AIX |
| 35 | #pragma alloca |
| 36 | # else |
| 37 | # ifndef alloca |
| 38 | char *alloca (); |
| 39 | # endif |
| 40 | # endif |
| 41 | # endif |
| 42 | #endif |
| 43 | |
| 44 | #if defined STDC_HEADERS || defined _LIBC |
| 45 | # include <stdlib.h> |
| 46 | #else |
| 47 | char *getenv (); |
| 48 | # ifdef HAVE_MALLOC_H |
| 49 | # include <malloc.h> |
| 50 | # else |
| 51 | void free (); |
| 52 | # endif |
| 53 | #endif |
| 54 | |
| 55 | #if defined HAVE_STRING_H || defined _LIBC |
| 56 | # ifndef _GNU_SOURCE |
| 57 | # define _GNU_SOURCE 1 |
| 58 | # endif |
| 59 | # include <string.h> |
| 60 | #else |
| 61 | # include <strings.h> |
| 62 | # ifndef memcpy |
| 63 | # define memcpy(Dst, Src, Num) bcopy (Src, Dst, Num) |
| 64 | # endif |
| 65 | #endif |
| 66 | #if !HAVE_STRCHR && !defined _LIBC |
| 67 | # ifndef strchr |
| 68 | # define strchr index |
| 69 | # endif |
| 70 | #endif |
| 71 | |
| 72 | #include "gettext.h" |
| 73 | #include "gettextP.h" |
| 74 | |
| 75 | /* @@ end of prolog @@ */ |
| 76 | |
| 77 | #ifdef _LIBC |
| 78 | /* Rename the non ANSI C functions. This is required by the standard |
| 79 | because some ANSI C functions will require linking with this object |
| 80 | file and the name space must not be polluted. */ |
| 81 | # define strcasecmp __strcasecmp |
| 82 | |
| 83 | # define mempcpy __mempcpy |
| 84 | # define HAVE_MEMPCPY 1 |
| 85 | |
| 86 | /* We need locking here since we can be called from different places. */ |
| 87 | # include <bits/libc-lock.h> |
| 88 | |
| 89 | __libc_lock_define_initialized (static, lock); |
| 90 | #endif |
| 91 | |
| 92 | |
| 93 | /* For those loosing systems which don't have `alloca' we have to add |
| 94 | some additional code emulating it. */ |
| 95 | #ifdef HAVE_ALLOCA |
| 96 | /* Nothing has to be done. */ |
| 97 | # define ADD_BLOCK(list, address) /* nothing */ |
| 98 | # define FREE_BLOCKS(list) /* nothing */ |
| 99 | #else |
| 100 | struct block_list |
| 101 | { |
| 102 | void *address; |
| 103 | struct block_list *next; |
| 104 | }; |
| 105 | # define ADD_BLOCK(list, addr) \ |
| 106 | do { \ |
| 107 | struct block_list *newp = (struct block_list *) malloc (sizeof (*newp)); \ |
| 108 | /* If we cannot get a free block we cannot add the new element to \ |
| 109 | the list. */ \ |
| 110 | if (newp != NULL) { \ |
| 111 | newp->address = (addr); \ |
| 112 | newp->next = (list); \ |
| 113 | (list) = newp; \ |
| 114 | } \ |
| 115 | } while (0) |
| 116 | # define FREE_BLOCKS(list) \ |
| 117 | do { \ |
| 118 | while (list != NULL) { \ |
| 119 | struct block_list *old = list; \ |
| 120 | list = list->next; \ |
| 121 | free (old); \ |
| 122 | } \ |
| 123 | } while (0) |
| 124 | # undef alloca |
| 125 | # define alloca(size) (malloc (size)) |
| 126 | #endif /* have alloca */ |
| 127 | |
| 128 | |
| 129 | struct alias_map |
| 130 | { |
| 131 | const char *alias; |
| 132 | const char *value; |
| 133 | }; |
| 134 | |
| 135 | |
| 136 | static char *string_space = NULL; |
| 137 | static size_t string_space_act = 0; |
| 138 | static size_t string_space_max = 0; |
| 139 | static struct alias_map *map; |
| 140 | static size_t nmap = 0; |
| 141 | static size_t maxmap = 0; |
| 142 | |
| 143 | |
| 144 | /* Prototypes for local functions. */ |
| 145 | static size_t read_alias_file PARAMS ((const char *fname, int fname_len)) |
| 146 | internal_function; |
| 147 | static void extend_alias_table PARAMS ((void)); |
| 148 | static int alias_compare PARAMS ((const struct alias_map *map1, |
| 149 | const struct alias_map *map2)); |
| 150 | |
| 151 | |
| 152 | const char * |
| 153 | _nl_expand_alias (name) |
| 154 | const char *name; |
| 155 | { |
| 156 | static const char *locale_alias_path = LOCALE_ALIAS_PATH; |
| 157 | struct alias_map *retval; |
| 158 | const char *result = NULL; |
| 159 | size_t added; |
| 160 | |
| 161 | #ifdef _LIBC |
| 162 | __libc_lock_lock (lock); |
| 163 | #endif |
| 164 | |
| 165 | do |
| 166 | { |
| 167 | struct alias_map item; |
| 168 | |
| 169 | item.alias = name; |
| 170 | |
| 171 | if (nmap > 0) |
| 172 | retval = (struct alias_map *) bsearch (&item, map, nmap, |
| 173 | sizeof (struct alias_map), |
| 174 | (int (*) PARAMS ((const void *, |
| 175 | const void *)) |
| 176 | ) alias_compare); |
| 177 | else |
| 178 | retval = NULL; |
| 179 | |
| 180 | /* We really found an alias. Return the value. */ |
| 181 | if (retval != NULL) |
| 182 | { |
| 183 | result = retval->value; |
| 184 | break; |
| 185 | } |
| 186 | |
| 187 | /* Perhaps we can find another alias file. */ |
| 188 | added = 0; |
| 189 | while (added == 0 && locale_alias_path[0] != '\0') |
| 190 | { |
| 191 | const char *start; |
| 192 | |
| 193 | while (locale_alias_path[0] == ':') |
| 194 | ++locale_alias_path; |
| 195 | start = locale_alias_path; |
| 196 | |
| 197 | while (locale_alias_path[0] != '\0' && locale_alias_path[0] != ':') |
| 198 | ++locale_alias_path; |
| 199 | |
| 200 | if (start < locale_alias_path) |
| 201 | added = read_alias_file (start, locale_alias_path - start); |
| 202 | } |
| 203 | } |
| 204 | while (added != 0); |
| 205 | |
| 206 | #ifdef _LIBC |
| 207 | __libc_lock_unlock (lock); |
| 208 | #endif |
| 209 | |
| 210 | return result; |
| 211 | } |
| 212 | |
| 213 | |
| 214 | static size_t |
| 215 | internal_function |
| 216 | read_alias_file (fname, fname_len) |
| 217 | const char *fname; |
| 218 | int fname_len; |
| 219 | { |
| 220 | #ifndef HAVE_ALLOCA |
| 221 | struct block_list *block_list = NULL; |
| 222 | #endif |
| 223 | FILE *fp; |
| 224 | char *full_fname; |
| 225 | size_t added; |
| 226 | static const char aliasfile[] = "/locale.alias"; |
| 227 | |
| 228 | full_fname = (char *) alloca (fname_len + sizeof aliasfile); |
| 229 | ADD_BLOCK (block_list, full_fname); |
| 230 | #ifdef HAVE_MEMPCPY |
| 231 | mempcpy (mempcpy (full_fname, fname, fname_len), |
| 232 | aliasfile, sizeof aliasfile); |
| 233 | #else |
| 234 | memcpy (full_fname, fname, fname_len); |
| 235 | memcpy (&full_fname[fname_len], aliasfile, sizeof aliasfile); |
| 236 | #endif |
| 237 | |
| 238 | fp = fopen (full_fname, "r"); |
| 239 | if (fp == NULL) |
| 240 | { |
| 241 | FREE_BLOCKS (block_list); |
| 242 | return 0; |
| 243 | } |
| 244 | |
| 245 | added = 0; |
| 246 | while (!feof (fp)) |
| 247 | { |
| 248 | /* It is a reasonable approach to use a fix buffer here because |
| 249 | a) we are only interested in the first two fields |
| 250 | b) these fields must be usable as file names and so must not |
| 251 | be that long |
| 252 | */ |
| 253 | unsigned char buf[BUFSIZ]; |
| 254 | unsigned char *alias; |
| 255 | unsigned char *value; |
| 256 | unsigned char *cp; |
| 257 | |
| 258 | if (fgets (buf, sizeof buf, fp) == NULL) |
| 259 | /* EOF reached. */ |
| 260 | break; |
| 261 | |
| 262 | /* Possibly not the whole line fits into the buffer. Ignore |
| 263 | the rest of the line. */ |
| 264 | if (strchr (buf, '\n') == NULL) |
| 265 | { |
| 266 | char altbuf[BUFSIZ]; |
| 267 | do |
| 268 | if (fgets (altbuf, sizeof altbuf, fp) == NULL) |
| 269 | /* Make sure the inner loop will be left. The outer loop |
| 270 | will exit at the `feof' test. */ |
| 271 | break; |
| 272 | while (strchr (altbuf, '\n') == NULL); |
| 273 | } |
| 274 | |
| 275 | cp = buf; |
| 276 | /* Ignore leading white space. */ |
| 277 | while (isspace (cp[0])) |
| 278 | ++cp; |
| 279 | |
| 280 | /* A leading '#' signals a comment line. */ |
| 281 | if (cp[0] != '\0' && cp[0] != '#') |
| 282 | { |
| 283 | alias = cp++; |
| 284 | while (cp[0] != '\0' && !isspace (cp[0])) |
| 285 | ++cp; |
| 286 | /* Terminate alias name. */ |
| 287 | if (cp[0] != '\0') |
| 288 | *cp++ = '\0'; |
| 289 | |
| 290 | /* Now look for the beginning of the value. */ |
| 291 | while (isspace (cp[0])) |
| 292 | ++cp; |
| 293 | |
| 294 | if (cp[0] != '\0') |
| 295 | { |
| 296 | size_t alias_len; |
| 297 | size_t value_len; |
| 298 | |
| 299 | value = cp++; |
| 300 | while (cp[0] != '\0' && !isspace (cp[0])) |
| 301 | ++cp; |
| 302 | /* Terminate value. */ |
| 303 | if (cp[0] == '\n') |
| 304 | { |
| 305 | /* This has to be done to make the following test |
| 306 | for the end of line possible. We are looking for |
| 307 | the terminating '\n' which do not overwrite here. */ |
| 308 | *cp++ = '\0'; |
| 309 | *cp = '\n'; |
| 310 | } |
| 311 | else if (cp[0] != '\0') |
| 312 | *cp++ = '\0'; |
| 313 | |
| 314 | if (nmap >= maxmap) |
| 315 | extend_alias_table (); |
| 316 | |
| 317 | alias_len = strlen (alias) + 1; |
| 318 | value_len = strlen (value) + 1; |
| 319 | |
| 320 | if (string_space_act + alias_len + value_len > string_space_max) |
| 321 | { |
| 322 | /* Increase size of memory pool. */ |
| 323 | size_t new_size = (string_space_max |
| 324 | + (alias_len + value_len > 1024 |
| 325 | ? alias_len + value_len : 1024)); |
| 326 | char *new_pool = (char *) realloc (string_space, new_size); |
| 327 | if (new_pool == NULL) |
| 328 | { |
| 329 | FREE_BLOCKS (block_list); |
| 330 | return added; |
| 331 | } |
| 332 | string_space = new_pool; |
| 333 | string_space_max = new_size; |
| 334 | } |
| 335 | |
| 336 | map[nmap].alias = memcpy (&string_space[string_space_act], |
| 337 | alias, alias_len); |
| 338 | string_space_act += alias_len; |
| 339 | |
| 340 | map[nmap].value = memcpy (&string_space[string_space_act], |
| 341 | value, value_len); |
| 342 | string_space_act += value_len; |
| 343 | |
| 344 | ++nmap; |
| 345 | ++added; |
| 346 | } |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | /* Should we test for ferror()? I think we have to silently ignore |
| 351 | errors. --drepper */ |
| 352 | fclose (fp); |
| 353 | |
| 354 | if (added > 0) |
| 355 | qsort (map, nmap, sizeof (struct alias_map), |
| 356 | (int (*) PARAMS ((const void *, const void *))) alias_compare); |
| 357 | |
| 358 | FREE_BLOCKS (block_list); |
| 359 | return added; |
| 360 | } |
| 361 | |
| 362 | |
| 363 | static void |
| 364 | extend_alias_table () |
| 365 | { |
| 366 | size_t new_size; |
| 367 | struct alias_map *new_map; |
| 368 | |
| 369 | new_size = maxmap == 0 ? 100 : 2 * maxmap; |
| 370 | new_map = (struct alias_map *) realloc (map, (new_size |
| 371 | * sizeof (struct alias_map))); |
| 372 | if (new_map == NULL) |
| 373 | /* Simply don't extend: we don't have any more core. */ |
| 374 | return; |
| 375 | |
| 376 | map = new_map; |
| 377 | maxmap = new_size; |
| 378 | } |
| 379 | |
| 380 | |
| 381 | #ifdef _LIBC |
| 382 | static void __attribute__ ((unused)) |
| 383 | free_mem (void) |
| 384 | { |
| 385 | if (string_space != NULL) |
| 386 | free (string_space); |
| 387 | if (map != NULL) |
| 388 | free (map); |
| 389 | } |
| 390 | text_set_element (__libc_subfreeres, free_mem); |
| 391 | #endif |
| 392 | |
| 393 | |
| 394 | static int |
| 395 | alias_compare (map1, map2) |
| 396 | const struct alias_map *map1; |
| 397 | const struct alias_map *map2; |
| 398 | { |
| 399 | #if defined _LIBC || defined HAVE_STRCASECMP |
| 400 | return strcasecmp (map1->alias, map2->alias); |
| 401 | #else |
| 402 | const unsigned char *p1 = (const unsigned char *) map1->alias; |
| 403 | const unsigned char *p2 = (const unsigned char *) map2->alias; |
| 404 | unsigned char c1, c2; |
| 405 | |
| 406 | if (p1 == p2) |
| 407 | return 0; |
| 408 | |
| 409 | do |
| 410 | { |
| 411 | /* I know this seems to be odd but the tolower() function in |
| 412 | some systems libc cannot handle nonalpha characters. */ |
| 413 | c1 = isupper (*p1) ? tolower (*p1) : *p1; |
| 414 | c2 = isupper (*p2) ? tolower (*p2) : *p2; |
| 415 | if (c1 == '\0') |
| 416 | break; |
| 417 | ++p1; |
| 418 | ++p2; |
| 419 | } |
| 420 | while (c1 == c2); |
| 421 | |
| 422 | return c1 - c2; |
| 423 | #endif |
| 424 | } |