string/xpg-strerror.c

   1 /* Copyright (C) 1991, 1993, 1995, 1996, 1997, 1998, 2000, 2002, 2004
   2    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 Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the 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    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <libintl.h>
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <sys/param.h>
  25 #include <stdio-common/_itoa.h>
  26
  27 /* It is critical here that we always use the `dcgettext' function for
  28    the message translation.  Since <libintl.h> only defines the macro
  29    `dgettext' to use `dcgettext' for optimizing programs this is not
  30    always guaranteed.  */
  31 #ifndef dgettext
  32 # include <locale.h>            /* We need LC_MESSAGES.  */
  33 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  34 #endif
  35
  36 /* Fill buf with a string describing the errno code in ERRNUM.  */
  37 int
  38 __xpg_strerror_r (int errnum, char *buf, size_t buflen)
  39 {
  40   if (errnum < 0 || errnum >= _sys_nerr_internal
  41       || _sys_errlist_internal[errnum] == NULL)
  42     {
  43       __set_errno (EINVAL);
  44       return -1;
  45     }
  46   const char *estr = (const char *) _(_sys_errlist_internal[errnum]);
  47   size_t estrlen = strlen (estr) + 1;
  48
  49   if (buflen < estrlen)
  50     {
  51       __set_errno (ERANGE);
  52       return -1;
  53     }
  54
  55   memcpy (buf, estr, estrlen);
  56   return 0;
  57 }