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