sysdeps/generic/_strerror.c

   1 /* Copyright (C) 1991, 1993, 1995, 1996 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <libintl.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22 #include "../stdio-common/_itoa.h"
  23
  24 #ifndef HAVE_GNU_LD
  25 #define _sys_errlist sys_errlist
  26 #define _sys_nerr sys_nerr
  27 #endif
  28
  29 /* It is critical here that we always use the `dcgettext' function for
  30    the message translation.  Since <libintl.h> only defines the macro
  31    `dgettext' to use `dcgettext' for optimizing programs this is not
  32    always guaranteed.  */
  33 #ifndef dgettext
  34 # include <locale.h>            /* We need LC_MESSAGES.  */
  35 # define dgettext(domainname, msgid) dcgettext (domainname, msgid, LC_MESSAGES)
  36 #endif
  37
  38 /* Return a string describing the errno code in ERRNUM.  */
  39 char *
  40 _strerror_internal (int errnum, char *buf, size_t buflen)
  41 {
  42   if (errnum < 0 || errnum >= _sys_nerr)
  43     {
  44       const char *unk = _("Unknown error ");
  45       const size_t unklen = strlen (unk);
  46       char *p = buf + buflen;
  47       *--p = '\0';
  48       p = _itoa (errnum, p, 10, 0);
  49       return memcpy (p - unklen, unk, unklen);
  50     }
  51
  52   return (char *) _(_sys_errlist[errnum]);
  53 }