locale/nl_langinfo.c

   1 /* User interface for extracting locale-dependent parameters.
   2    Copyright (C) 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   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 <langinfo.h>
  21 #include <errno.h>
  22 #include <stddef.h>
  23 #include "localeinfo.h"
  24
  25
  26 /* Return a string with the data for locale-dependent parameter ITEM.  */
  27
  28 char *
  29 nl_langinfo (item)
  30      nl_item item;
  31 {
  32   int category = _NL_ITEM_CATEGORY (item);
  33   unsigned int index = _NL_ITEM_INDEX (item);
  34   const struct locale_data *data;
  35
  36   if (category < 0 || category >= LC_ALL)
  37     {
  38       /* Bogus category: bogus item.  */
  39       __set_errno (EINVAL);
  40       return NULL;
  41     }
  42
  43   data = *_nl_current[category];
  44
  45   if (index >= data->nstrings)
  46     {
  47       /* Bogus index for this category: bogus item.  */
  48       __set_errno (EINVAL);
  49       return NULL;
  50     }
  51
  52   /* Return the string for the specified item.  */
  53   return (char *) data->values[index].string;
  54 }