catgets/catgets.c

   1 /* Copyright (C) 1996 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
   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 <nl_types.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <unistd.h>
  26 #include <sys/mman.h>
  27
  28 #include "catgetsinfo.h"
  29
  30
  31 /* Open the catalog and return a descriptor for the catalog.  */
  32 nl_catd
  33 catopen (const char *cat_name, int flag)
  34 {
  35   __nl_catd result;
  36   const char *env_var;
  37
  38   result = (__nl_catd) malloc (sizeof (*result));
  39   if (result == NULL)
  40     /* We cannot get enough memory.  */
  41     return (nl_catd) -1;
  42
  43   result->status = closed;
  44
  45   result->cat_name = __strdup (cat_name);
  46   if (result->cat_name == NULL)
  47     {
  48       free (result);
  49       __set_errno (ENOMEM);
  50       return (nl_catd) -1;
  51     }
  52
  53   if (strchr (cat_name, '/') == NULL)
  54     {
  55       if (flag == NL_CAT_LOCALE)
  56         {
  57           env_var = getenv ("LC_ALL");
  58           if (env_var == NULL)
  59             {
  60               env_var = getenv ("LC_MESSAGES");
  61               if (env_var == NULL)
  62                 {
  63                   env_var = getenv ("LANG");
  64                   if (env_var == NULL)
  65                     env_var = "C";
  66                 }
  67             }
  68         }
  69       else
  70         {
  71           env_var = getenv ("LANG");
  72           if (env_var == NULL)
  73             env_var = "C";
  74         }
  75
  76       result->env_var = __strdup (env_var);
  77       if (result->env_var == NULL)
  78         {
  79           free ((void *) result->cat_name);
  80           free ((void *) result);
  81           __set_errno (ENOMEM);
  82           return (nl_catd) -1;
  83         }
  84
  85       if (__secure_getenv ("NLSPATH") != NULL)
  86         result->nlspath = __strdup (getenv ("NLSPATH"));
  87       else
  88         result->nlspath = __strdup (NLSPATH);
  89
  90       if (result->nlspath == NULL)
  91         {
  92           free ((void *) result->cat_name);
  93           free ((void *) result->env_var);
  94           free ((void *) result);
  95           __set_errno (ENOMEM);
  96           return (nl_catd) -1;
  97         }
  98     }
  99   else
 100     {
 101       result->env_var = NULL;
 102       result->nlspath = NULL;
 103     }
 104
 105   return (nl_catd) result;
 106 }
 107
 108
 109 /* Return message from message catalog.  */
 110 char *
 111 catgets (nl_catd catalog_desc, int set, int message, const char *string)
 112 {
 113   __nl_catd catalog;
 114   size_t idx;
 115   size_t cnt;
 116
 117   /* Be generous if catalog which failed to be open is used.  */
 118   if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
 119     return (char *) string;
 120
 121   catalog = (__nl_catd) catalog_desc;
 122
 123   if (catalog->status == closed)
 124     __open_catalog (catalog, 1);
 125
 126   if (catalog->status == nonexisting)
 127     {
 128       __set_errno (EBADF);
 129       return (char *) string;
 130     }
 131
 132   idx = ((set * message) % catalog->plane_size) * 3;
 133   cnt = 0;
 134   do
 135     {
 136       if (catalog->name_ptr[idx + 0] == (u_int32_t) set
 137           && catalog->name_ptr[idx + 1] == (u_int32_t) message)
 138         return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
 139
 140       idx += catalog->plane_size * 3;
 141     }
 142   while (++cnt < catalog->plane_depth);
 143
 144   __set_errno (ENOMSG);
 145   return (char *) string;
 146 }
 147
 148
 149 /* Return resources used for loaded message catalog.  */
 150 int
 151 catclose (nl_catd catalog_desc)
 152 {
 153   __nl_catd catalog;
 154
 155   catalog = (__nl_catd) catalog_desc;
 156
 157   if (catalog->status == mmaped)
 158     munmap ((void *) catalog->file_ptr, catalog->file_size);
 159   else if (catalog->status == malloced)
 160     free ((void *) catalog->file_ptr);
 161   else if (catalog->status != closed && catalog->status != nonexisting)
 162     {
 163       __set_errno (EBADF);
 164       return -1;
 165     }
 166
 167   if (catalog->nlspath)
 168     free ((void *) catalog->nlspath);
 169   if (catalog->env_var)
 170     free ((void *) catalog->env_var);
 171   free ((void *) catalog);
 172
 173   return 0;
 174 }