intl/dcgettext.c

   1 /* Implementation of the dcgettext(3) function.
   2    Copyright (C) 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
   3
   4    This file is part of the GNU C Library.  Its master source is NOT part of
   5    the C library, however.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifdef HAVE_CONFIG_H
  23 # include <config.h>
  24 #endif
  25
  26 #include <sys/types.h>
  27
  28 #if defined __GNUC__ && !defined C_ALLOCA
  29 # define alloca __builtin_alloca
  30 # define HAVE_ALLOCA 1
  31 #else
  32 # if (defined HAVE_ALLOCA_H || defined _LIBC) && !defined C_ALLOCA
  33 #  include <alloca.h>
  34 # else
  35 #  ifdef _AIX
  36  #pragma alloca
  37 #  else
  38 #   ifndef alloca
  39 char *alloca ();
  40 #   endif
  41 #  endif
  42 # endif
  43 #endif
  44
  45 #include <errno.h>
  46 #ifndef errno
  47 extern int errno;
  48 #endif
  49 #ifndef __set_errno
  50 # define __set_errno(val) errno = (val)
  51 #endif
  52
  53 #if defined STDC_HEADERS || defined _LIBC
  54 # include <stdlib.h>
  55 #else
  56 char *getenv ();
  57 # ifdef HAVE_MALLOC_H
  58 #  include <malloc.h>
  59 # else
  60 void free ();
  61 # endif
  62 #endif
  63
  64 #if defined HAVE_STRING_H || defined _LIBC
  65 # ifndef _GNU_SOURCE
  66 #  define _GNU_SOURCE   1
  67 # endif
  68 # include <string.h>
  69 #else
  70 # include <strings.h>
  71 #endif
  72 #if !HAVE_STRCHR && !defined _LIBC
  73 # ifndef strchr
  74 #  define strchr index
  75 # endif
  76 #endif
  77
  78 #if defined HAVE_UNISTD_H || defined _LIBC
  79 # include <unistd.h>
  80 #endif
  81
  82 #if defined HAVE_LOCALE_H || defined _LIBC
  83 # include <locale.h>
  84 #endif
  85
  86 #if defined HAVE_SYS_PARAM_H || defined _LIBC
  87 # include <sys/param.h>
  88 #endif
  89
  90 #include "gettext.h"
  91 #include "gettextP.h"
  92 #ifdef _LIBC
  93 # include <libintl.h>
  94 #else
  95 # include "libgettext.h"
  96 #endif
  97 #include "hash-string.h"
  98
  99 /* Thread safetyness.  */
 100 #ifdef _LIBC
 101 # include <bits/libc-lock.h>
 102 #endif
 103
 104 /* @@ end of prolog @@ */
 105
 106 #ifdef _LIBC
 107 /* Rename the non ANSI C functions.  This is required by the standard
 108    because some ANSI C functions will require linking with this object
 109    file and the name space must not be polluted.  */
 110 # define getcwd __getcwd
 111 # ifndef stpcpy
 112 #  define stpcpy __stpcpy
 113 # endif
 114 #else
 115 # if !defined HAVE_GETCWD
 116 char *getwd ();
 117 #  define getcwd(buf, max) getwd (buf)
 118 # else
 119 char *getcwd ();
 120 # endif
 121 # ifndef HAVE_STPCPY
 122 static char *stpcpy PARAMS ((char *dest, const char *src));
 123 # endif
 124 #endif
 125
 126 /* Amount to increase buffer size by in each try.  */
 127 #define PATH_INCR 32
 128
 129 /* The following is from pathmax.h.  */
 130 /* Non-POSIX BSD systems might have gcc's limits.h, which doesn't define
 131    PATH_MAX but might cause redefinition warnings when sys/param.h is
 132    later included (as on MORE/BSD 4.3).  */
 133 #if defined(_POSIX_VERSION) || (defined(HAVE_LIMITS_H) && !defined(__GNUC__))
 134 # include <limits.h>
 135 #endif
 136
 137 #ifndef _POSIX_PATH_MAX
 138 # define _POSIX_PATH_MAX 255
 139 #endif
 140
 141 #if !defined(PATH_MAX) && defined(_PC_PATH_MAX)
 142 # define PATH_MAX (pathconf ("/", _PC_PATH_MAX) < 1 ? 1024 : pathconf ("/", _PC_PATH_MAX))
 143 #endif
 144
 145 /* Don't include sys/param.h if it already has been.  */
 146 #if defined(HAVE_SYS_PARAM_H) && !defined(PATH_MAX) && !defined(MAXPATHLEN)
 147 # include <sys/param.h>
 148 #endif
 149
 150 #if !defined(PATH_MAX) && defined(MAXPATHLEN)
 151 # define PATH_MAX MAXPATHLEN
 152 #endif
 153
 154 #ifndef PATH_MAX
 155 # define PATH_MAX _POSIX_PATH_MAX
 156 #endif
 157
 158 /* XPG3 defines the result of `setlocale (category, NULL)' as:
 159    ``Directs `setlocale()' to query `category' and return the current
 160      setting of `local'.''
 161    However it does not specify the exact format.  And even worse: POSIX
 162    defines this not at all.  So we can use this feature only on selected
 163    system (e.g. those using GNU C Library).  */
 164 #ifdef _LIBC
 165 # define HAVE_LOCALE_NULL
 166 #endif
 167
 168 /* Name of the default domain used for gettext(3) prior any call to
 169    textdomain(3).  The default value for this is "messages".  */
 170 const char _nl_default_default_domain[] = "messages";
 171
 172 /* Value used as the default domain for gettext(3).  */
 173 const char *_nl_current_default_domain = _nl_default_default_domain;
 174
 175 /* Contains the default location of the message catalogs.  */
 176 const char _nl_default_dirname[] = GNULOCALEDIR;
 177
 178 /* List with bindings of specific domains created by bindtextdomain()
 179    calls.  */
 180 struct binding *_nl_domain_bindings;
 181
 182 /* Prototypes for local functions.  */
 183 static const char *category_to_name PARAMS ((int category)) internal_function;
 184 static const char *guess_category_value PARAMS ((int category,
 185                                                  const char *categoryname))
 186      internal_function;
 187
 188
 189 /* For those loosing systems which don't have `alloca' we have to add
 190    some additional code emulating it.  */
 191 #ifdef HAVE_ALLOCA
 192 /* Nothing has to be done.  */
 193 # define ADD_BLOCK(list, address) /* nothing */
 194 # define FREE_BLOCKS(list) /* nothing */
 195 #else
 196 struct block_list
 197 {
 198   void *address;
 199   struct block_list *next;
 200 };
 201 # define ADD_BLOCK(list, addr)                                                \
 202   do {                                                                        \
 203     struct block_list *newp = (struct block_list *) malloc (sizeof (*newp));  \
 204     /* If we cannot get a free block we cannot add the new element to         \
 205        the list.  */                                                          \
 206     if (newp != NULL) {                                                       \
 207       newp->address = (addr);                                                 \
 208       newp->next = (list);                                                    \
 209       (list) = newp;                                                          \
 210     }                                                                         \
 211   } while (0)
 212 # define FREE_BLOCKS(list)                                                    \
 213   do {                                                                        \
 214     while (list != NULL) {                                                    \
 215       struct block_list *old = list;                                          \
 216       list = list->next;                                                      \
 217       free (old);                                                             \
 218     }                                                                         \
 219   } while (0)
 220 # undef alloca
 221 # define alloca(size) (malloc (size))
 222 #endif  /* have alloca */
 223
 224
 225 /* Names for the libintl functions are a problem.  They must not clash
 226    with existing names and they should follow ANSI C.  But this source
 227    code is also used in GNU C Library where the names have a __
 228    prefix.  So we have to make a difference here.  */
 229 #ifdef _LIBC
 230 # define DCGETTEXT __dcgettext
 231 #else
 232 # define DCGETTEXT dcgettext__
 233 #endif
 234
 235 /* Checking whether the binaries runs SUID must be done and glibc provides
 236    easier methods therefore we make a difference here.  */
 237 #ifdef _LIBC
 238 # define ENABLE_SECURE __libc_enable_secure
 239 # define DETERMINE_SECURE
 240 #else
 241 static int enable_secure;
 242 # define ENABLE_SECURE (enable_secure == 1)
 243 # define DETERMINE_SECURE \
 244   if (enable_secure == 0)                                                     \
 245     {                                                                         \
 246       if (getuid () != geteuid () || getgid () != getegid ())                 \
 247         enable_secure = 1;                                                    \
 248       else                                                                    \
 249         enable_secure = -1;                                                   \
 250     }
 251 #endif
 252
 253 /* Look up MSGID in the DOMAINNAME message catalog for the current CATEGORY
 254    locale.  */
 255 char *
 256 DCGETTEXT (domainname, msgid, category)
 257      const char *domainname;
 258      const char *msgid;
 259      int category;
 260 {
 261 #ifndef HAVE_ALLOCA
 262   struct block_list *block_list = NULL;
 263 #endif
 264   struct loaded_l10nfile *domain;
 265   struct binding *binding;
 266   const char *categoryname;
 267   const char *categoryvalue;
 268   char *dirname, *xdomainname;
 269   char *single_locale;
 270   char *retval;
 271   int saved_errno = errno;
 272
 273   /* If no real MSGID is given return NULL.  */
 274   if (msgid == NULL)
 275     return NULL;
 276
 277   /* See whether this is a SUID binary or not.  */
 278   DETERMINE_SECURE;
 279
 280   /* If DOMAINNAME is NULL, we are interested in the default domain.  If
 281      CATEGORY is not LC_MESSAGES this might not make much sense but the
 282      definition left this undefined.  */
 283   if (domainname == NULL)
 284     domainname = _nl_current_default_domain;
 285
 286   /* First find matching binding.  */
 287   for (binding = _nl_domain_bindings; binding != NULL; binding = binding->next)
 288     {
 289       int compare = strcmp (domainname, binding->domainname);
 290       if (compare == 0)
 291         /* We found it!  */
 292         break;
 293       if (compare < 0)
 294         {
 295           /* It is not in the list.  */
 296           binding = NULL;
 297           break;
 298         }
 299     }
 300
 301   if (binding == NULL)
 302     dirname = (char *) _nl_default_dirname;
 303   else if (binding->dirname[0] == '/')
 304     dirname = binding->dirname;
 305   else
 306     {
 307       /* We have a relative path.  Make it absolute now.  */
 308       size_t dirname_len = strlen (binding->dirname) + 1;
 309       size_t path_max;
 310       char *ret;
 311
 312       path_max = (unsigned int) PATH_MAX;
 313       path_max += 2;            /* The getcwd docs say to do this.  */
 314
 315       dirname = (char *) alloca (path_max + dirname_len);
 316       ADD_BLOCK (block_list, dirname);
 317
 318       __set_errno (0);
 319       while ((ret = getcwd (dirname, path_max)) == NULL && errno == ERANGE)
 320         {
 321           path_max += PATH_INCR;
 322           dirname = (char *) alloca (path_max + dirname_len);
 323           ADD_BLOCK (block_list, dirname);
 324           __set_errno (0);
 325         }
 326
 327       if (ret == NULL)
 328         {
 329           /* We cannot get the current working directory.  Don't signal an
 330              error but simply return the default string.  */
 331           FREE_BLOCKS (block_list);
 332           __set_errno (saved_errno);
 333           return (char *) msgid;
 334         }
 335
 336       stpcpy (stpcpy (strchr (dirname, '\0'), "/"), binding->dirname);
 337     }
 338
 339   /* Now determine the symbolic name of CATEGORY and its value.  */
 340   categoryname = category_to_name (category);
 341   categoryvalue = guess_category_value (category, categoryname);
 342
 343   xdomainname = (char *) alloca (strlen (categoryname)
 344                                  + strlen (domainname) + 5);
 345   ADD_BLOCK (block_list, xdomainname);
 346
 347   stpcpy (stpcpy (stpcpy (stpcpy (xdomainname, categoryname), "/"),
 348                   domainname),
 349           ".mo");
 350
 351   /* Creating working area.  */
 352   single_locale = (char *) alloca (strlen (categoryvalue) + 1);
 353   ADD_BLOCK (block_list, single_locale);
 354
 355
 356   /* Search for the given string.  This is a loop because we perhaps
 357      got an ordered list of languages to consider for the translation.  */
 358   while (1)
 359     {
 360       /* Make CATEGORYVALUE point to the next element of the list.  */
 361       while (categoryvalue[0] != '\0' && categoryvalue[0] == ':')
 362         ++categoryvalue;
 363       if (categoryvalue[0] == '\0')
 364         {
 365           /* The whole contents of CATEGORYVALUE has been searched but
 366              no valid entry has been found.  We solve this situation
 367              by implicitly appending a "C" entry, i.e. no translation
 368              will take place.  */
 369           single_locale[0] = 'C';
 370           single_locale[1] = '\0';
 371         }
 372       else
 373         {
 374           char *cp = single_locale;
 375           while (categoryvalue[0] != '\0' && categoryvalue[0] != ':')
 376             *cp++ = *categoryvalue++;
 377           *cp = '\0';
 378
 379           /* When this is a SUID binary we must not allow accessing files
 380              outside the dedicated directories.  */
 381           if (ENABLE_SECURE
 382               && (memchr (single_locale, '/',
 383                           _nl_find_language (single_locale) - single_locale)
 384                   != NULL))
 385             /* Ingore this entry.  */
 386             continue;
 387         }
 388
 389       /* If the current locale value is C (or POSIX) we don't load a
 390          domain.  Return the MSGID.  */
 391       if (strcmp (single_locale, "C") == 0
 392           || strcmp (single_locale, "POSIX") == 0)
 393         {
 394           FREE_BLOCKS (block_list);
 395           __set_errno (saved_errno);
 396           return (char *) msgid;
 397         }
 398
 399
 400       /* Find structure describing the message catalog matching the
 401          DOMAINNAME and CATEGORY.  */
 402       domain = _nl_find_domain (dirname, single_locale, xdomainname);
 403
 404       if (domain != NULL)
 405         {
 406           retval = _nl_find_msg (domain, msgid);
 407
 408           if (retval == NULL)
 409             {
 410               int cnt;
 411
 412               for (cnt = 0; domain->successor[cnt] != NULL; ++cnt)
 413                 {
 414                   retval = _nl_find_msg (domain->successor[cnt], msgid);
 415
 416                   if (retval != NULL)
 417                     break;
 418                 }
 419             }
 420
 421           if (retval != NULL)
 422             {
 423               FREE_BLOCKS (block_list);
 424               __set_errno (saved_errno);
 425               return retval;
 426             }
 427         }
 428     }
 429   /* NOTREACHED */
 430 }
 431
 432 #ifdef _LIBC
 433 /* Alias for function name in GNU C Library.  */
 434 weak_alias (__dcgettext, dcgettext);
 435 #endif
 436
 437
 438 char *
 439 internal_function
 440 _nl_find_msg (domain_file, msgid)
 441      struct loaded_l10nfile *domain_file;
 442      const char *msgid;
 443 {
 444   size_t act = 0;
 445   size_t top, bottom;
 446   struct loaded_domain *domain;
 447
 448   if (domain_file->decided == 0)
 449     _nl_load_domain (domain_file);
 450
 451   if (domain_file->data == NULL)
 452     return NULL;
 453
 454   domain = (struct loaded_domain *) domain_file->data;
 455
 456   /* Locate the MSGID and its translation.  */
 457   if (domain->hash_size > 2 && domain->hash_tab != NULL)
 458     {
 459       /* Use the hashing table.  */
 460       nls_uint32 len = strlen (msgid);
 461       nls_uint32 hash_val = hash_string (msgid);
 462       nls_uint32 idx = hash_val % domain->hash_size;
 463       nls_uint32 incr = 1 + (hash_val % (domain->hash_size - 2));
 464       nls_uint32 nstr = W (domain->must_swap, domain->hash_tab[idx]);
 465
 466       if (nstr == 0)
 467         /* Hash table entry is empty.  */
 468         return NULL;
 469
 470       if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len
 471           && strcmp (msgid,
 472                      domain->data + W (domain->must_swap,
 473                                        domain->orig_tab[nstr - 1].offset)) == 0)
 474         {
 475           /* We found an entry.  If we have to convert the string to use
 476              a different character set this is the time.  */
 477           char *result =
 478             (char *) domain->data + W (domain->must_swap,
 479                                        domain->trans_tab[nstr - 1].offset);
 480
 481           if (
 482 #ifdef _LIBC
 483               domain->conv != (__gconv_t) -1
 484 #else
 485 # if HAVE_ICONV
 486               domain->conv != (iconv_t) -1
 487 # endif
 488 #endif
 489               )
 490             {
 491               /* We are supposed to do a conversion.  First allocate an
 492                  appropriate table with the same structure as the hash
 493                  table in the file where we can put the pointers to the
 494                  converted strings in.  */
 495               if (domain->conv_tab == NULL
 496                   && ((domain->conv_tab = (char **) calloc (domain->hash_size,
 497                                                             sizeof (char *)))
 498                       == NULL))
 499                 /* Mark that we didn't succeed allocating a table.  */
 500                 domain->conv_tab = (char **) -1;
 501
 502               if (domain->conv_tab == (char **) -1)
 503                 /* Nothing we can do, no more memory.  */
 504                 return NULL;
 505
 506               if (domain->conv_tab[idx] == NULL)
 507                 {
 508                   /* We haven't used this string so far, so it is not
 509                      translated yet.  Do this now.  */
 510 #ifdef _LIBC
 511                   /* For glibc we use a bit more efficient memory handling.
 512                      We allocate always larger blocks which get used over
 513                      time.  This is faster than many small allocations.   */
 514                   __libc_lock_define_initialized (static, lock)
 515                   static unsigned char *freemem;
 516                   static size_t freemem_size;
 517                   /* Note that we include the NUL byte.  */
 518                   size_t resultlen = strlen (result) + 1;
 519                   const unsigned char *inbuf = result;
 520                   unsigned char *outbuf = freemem;
 521                   size_t written;
 522                   int res;
 523
 524                   __libc_lock_lock (lock);
 525
 526                   while ((res = __gconv (domain->conv,
 527                                          &inbuf, inbuf + resultlen,
 528                                          &outbuf, outbuf + freemem_size,
 529                                          &written)) == __GCONV_OK)
 530                     {
 531                       if (res != __GCONV_FULL_OUTPUT)
 532                         goto out;
 533
 534                       /* We must resize the buffer.  */
 535                       freemem_size = MAX (2 * freemem_size, 4064);
 536                       freemem = (char *) malloc (freemem_size);
 537                       if (freemem == NULL)
 538                         goto out;
 539
 540                       inbuf = result;
 541                       outbuf = freemem;
 542                     }
 543
 544                   /* We have now in our buffer a converted string.  Put this
 545                      in the hash table  */
 546                   domain->conv_tab[idx] = freemem;
 547                   freemem_size -= outbuf - freemem;
 548                   freemem = outbuf;
 549
 550                 out:
 551                   __libc_lock_unlock (lock);
 552 #endif
 553                 }
 554
 555               result = domain->conv_tab[idx];
 556             }
 557
 558           return result;
 559         }
 560
 561       while (1)
 562         {
 563           if (idx >= domain->hash_size - incr)
 564             idx -= domain->hash_size - incr;
 565           else
 566             idx += incr;
 567
 568           nstr = W (domain->must_swap, domain->hash_tab[idx]);
 569           if (nstr == 0)
 570             /* Hash table entry is empty.  */
 571             return NULL;
 572
 573           if (W (domain->must_swap, domain->orig_tab[nstr - 1].length) == len
 574               && strcmp (msgid,
 575                          domain->data + W (domain->must_swap,
 576                                            domain->orig_tab[nstr - 1].offset))
 577                  == 0)
 578             return (char *) domain->data
 579               + W (domain->must_swap, domain->trans_tab[nstr - 1].offset);
 580         }
 581       /* NOTREACHED */
 582     }
 583
 584   /* Now we try the default method:  binary search in the sorted
 585      array of messages.  */
 586   bottom = 0;
 587   top = domain->nstrings;
 588   while (bottom < top)
 589     {
 590       int cmp_val;
 591
 592       act = (bottom + top) / 2;
 593       cmp_val = strcmp (msgid, domain->data
 594                                + W (domain->must_swap,
 595                                     domain->orig_tab[act].offset));
 596       if (cmp_val < 0)
 597         top = act;
 598       else if (cmp_val > 0)
 599         bottom = act + 1;
 600       else
 601         break;
 602     }
 603
 604   /* If an translation is found return this.  */
 605   return bottom >= top ? NULL : (char *) domain->data
 606                                 + W (domain->must_swap,
 607                                      domain->trans_tab[act].offset);
 608 }
 609
 610
 611 /* Return string representation of locale CATEGORY.  */
 612 static const char *
 613 internal_function
 614 category_to_name (category)
 615      int category;
 616 {
 617   const char *retval;
 618
 619   switch (category)
 620   {
 621 #ifdef LC_COLLATE
 622   case LC_COLLATE:
 623     retval = "LC_COLLATE";
 624     break;
 625 #endif
 626 #ifdef LC_CTYPE
 627   case LC_CTYPE:
 628     retval = "LC_CTYPE";
 629     break;
 630 #endif
 631 #ifdef LC_MONETARY
 632   case LC_MONETARY:
 633     retval = "LC_MONETARY";
 634     break;
 635 #endif
 636 #ifdef LC_NUMERIC
 637   case LC_NUMERIC:
 638     retval = "LC_NUMERIC";
 639     break;
 640 #endif
 641 #ifdef LC_TIME
 642   case LC_TIME:
 643     retval = "LC_TIME";
 644     break;
 645 #endif
 646 #ifdef LC_MESSAGES
 647   case LC_MESSAGES:
 648     retval = "LC_MESSAGES";
 649     break;
 650 #endif
 651 #ifdef LC_RESPONSE
 652   case LC_RESPONSE:
 653     retval = "LC_RESPONSE";
 654     break;
 655 #endif
 656 #ifdef LC_ALL
 657   case LC_ALL:
 658     /* This might not make sense but is perhaps better than any other
 659        value.  */
 660     retval = "LC_ALL";
 661     break;
 662 #endif
 663   default:
 664     /* If you have a better idea for a default value let me know.  */
 665     retval = "LC_XXX";
 666   }
 667
 668   return retval;
 669 }
 670
 671 /* Guess value of current locale from value of the environment variables.  */
 672 static const char *
 673 internal_function
 674 guess_category_value (category, categoryname)
 675      int category;
 676      const char *categoryname;
 677 {
 678   const char *retval;
 679
 680   /* The highest priority value is the `LANGUAGE' environment
 681      variable.  This is a GNU extension.  */
 682   retval = getenv ("LANGUAGE");
 683   if (retval != NULL && retval[0] != '\0')
 684     return retval;
 685
 686   /* `LANGUAGE' is not set.  So we have to proceed with the POSIX
 687      methods of looking to `LC_ALL', `LC_xxx', and `LANG'.  On some
 688      systems this can be done by the `setlocale' function itself.  */
 689 #if defined HAVE_SETLOCALE && defined HAVE_LC_MESSAGES && defined HAVE_LOCALE_NULL
 690   return setlocale (category, NULL);
 691 #else
 692   /* Setting of LC_ALL overwrites all other.  */
 693   retval = getenv ("LC_ALL");
 694   if (retval != NULL && retval[0] != '\0')
 695     return retval;
 696
 697   /* Next comes the name of the desired category.  */
 698   retval = getenv (categoryname);
 699   if (retval != NULL && retval[0] != '\0')
 700     return retval;
 701
 702   /* Last possibility is the LANG environment variable.  */
 703   retval = getenv ("LANG");
 704   if (retval != NULL && retval[0] != '\0')
 705     return retval;
 706
 707   /* We use C as the default domain.  POSIX says this is implementation
 708      defined.  */
 709   return "C";
 710 #endif
 711 }
 712
 713 /* @@ begin of epilog @@ */
 714
 715 /* We don't want libintl.a to depend on any other library.  So we
 716    avoid the non-standard function stpcpy.  In GNU C Library this
 717    function is available, though.  Also allow the symbol HAVE_STPCPY
 718    to be defined.  */
 719 #if !_LIBC && !HAVE_STPCPY
 720 static char *
 721 stpcpy (dest, src)
 722      char *dest;
 723      const char *src;
 724 {
 725   while ((*dest++ = *src++) != '\0')
 726     /* Do nothing. */ ;
 727   return dest - 1;
 728 }
 729 #endif
 730
 731
 732 #ifdef _LIBC
 733 /* If we want to free all resources we have to do some work at
 734    program's end.  */
 735 static void __attribute__ ((unused))
 736 free_mem (void)
 737 {
 738   struct binding *runp;
 739
 740   for (runp = _nl_domain_bindings; runp != NULL; runp = runp->next)
 741     {
 742       free (runp->domainname);
 743       if (runp->dirname != _nl_default_dirname)
 744         /* Yes, this is a pointer comparison.  */
 745         free (runp->dirname);
 746     }
 747
 748   if (_nl_current_default_domain != _nl_default_default_domain)
 749     /* Yes, again a pointer comparison.  */
 750     free ((char *) _nl_current_default_domain);
 751 }
 752
 753 text_set_element (__libc_subfreeres, free_mem);
 754 #endif