catgets/catgets.c

   1 /* Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper, <drepper@gnu.org>.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   9
  10    The GNU C Library 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 GNU
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <alloca.h>
  21 #include <errno.h>
  22 #include <locale.h>
  23 #include <nl_types.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <sys/mman.h>
  28
  29 #include "catgetsinfo.h"
  30
  31
  32 /* Open the catalog and return a descriptor for the catalog.  */
  33 nl_catd
  34 catopen (const char *cat_name, int flag)
  35 {
  36   __nl_catd result;
  37   const char *env_var = NULL;
  38   const char *nlspath = NULL;
  39   size_t cat_name_len = strlen (cat_name) + 1;
  40   size_t env_var_len = 0;
  41   size_t nlspath_len = 0;
  42   char *endp;
  43
  44   if (strchr (cat_name, '/') == NULL)
  45     {
  46       if (flag == NL_CAT_LOCALE)
  47         /* Use the current locale setting for LC_MESSAGES.  */
  48         env_var = setlocale (LC_MESSAGES, NULL);
  49       else
  50         /* Use the LANG environment variable.  */
  51         env_var = getenv ("LANG");
  52
  53       if (env_var == NULL || *env_var == '\0'
  54           || (__libc_enable_secure && strchr (env_var, '/') != NULL))
  55         env_var = "C";
  56
  57       env_var_len = strlen (env_var) + 1;
  58
  59       nlspath = getenv ("NLSPATH");
  60       if (nlspath != NULL && *nlspath != '\0')
  61         {
  62           /* Append the system dependent directory.  */
  63           size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;
  64           char *tmp = alloca (len);
  65
  66           __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
  67           nlspath = tmp;
  68
  69           nlspath_len = len;
  70         }
  71       else
  72         {
  73           nlspath = NLSPATH;
  74
  75           nlspath_len = sizeof NLSPATH;
  76         }
  77     }
  78
  79   result = (__nl_catd) malloc (sizeof (*result) + cat_name_len
  80                                + env_var_len + nlspath_len);
  81   if (result == NULL)
  82     /* We cannot get enough memory.  */
  83     return (nl_catd) -1;
  84
  85   result->status = closed;
  86   result->cat_name = endp = (char *) (result + 1);
  87   endp = __mempcpy (endp, cat_name, cat_name_len);
  88
  89   result->env_var = cat_name_len != 0 ? endp : NULL;
  90   endp = __mempcpy (endp, env_var, env_var_len);
  91
  92   result->nlspath = nlspath_len != 0 ? endp : NULL;
  93   memcpy (endp, nlspath, nlspath_len);
  94
  95   __libc_lock_init (result->lock);
  96
  97   return (nl_catd) result;
  98 }
  99
 100
 101 /* Return message from message catalog.  */
 102 char *
 103 catgets (nl_catd catalog_desc, int set, int message, const char *string)
 104 {
 105   __nl_catd catalog;
 106   size_t idx;
 107   size_t cnt;
 108
 109   /* Be generous if catalog which failed to be open is used.  */
 110   if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
 111     return (char *) string;
 112
 113   catalog = (__nl_catd) catalog_desc;
 114
 115   if (catalog->status == closed)
 116     __open_catalog (catalog);
 117
 118   if (catalog->status == nonexisting)
 119     {
 120       __set_errno (EBADF);
 121       return (char *) string;
 122     }
 123
 124   idx = ((set * message) % catalog->plane_size) * 3;
 125   cnt = 0;
 126   do
 127     {
 128       if (catalog->name_ptr[idx + 0] == (u_int32_t) set
 129           && catalog->name_ptr[idx + 1] == (u_int32_t) message)
 130         return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
 131
 132       idx += catalog->plane_size * 3;
 133     }
 134   while (++cnt < catalog->plane_depth);
 135
 136   __set_errno (ENOMSG);
 137   return (char *) string;
 138 }
 139
 140
 141 /* Return resources used for loaded message catalog.  */
 142 int
 143 catclose (nl_catd catalog_desc)
 144 {
 145   __nl_catd catalog;
 146
 147   catalog = (__nl_catd) catalog_desc;
 148
 149 #ifdef _POSIX_MAPPED_FILES
 150   if (catalog->status == mmapped)
 151     __munmap ((void *) catalog->file_ptr, catalog->file_size);
 152   else
 153 #endif  /* _POSIX_MAPPED_FILES */
 154     if (catalog->status == malloced)
 155       free ((void *) catalog->file_ptr);
 156     else if (catalog->status != closed && catalog->status != nonexisting)
 157       {
 158         __set_errno (EBADF);
 159         return -1;
 160       }
 161
 162   free ((void *) catalog);
 163
 164   return 0;
 165 }