sysdeps/generic/_strerror.c

   1 /* Copyright (C) 19911993 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 <ansidecl.h>
  20 #include <stdio.h>
  21 #include <string.h>
  22
  23 #ifndef HAVE_GNU_LD
  24 #define _sys_errlist sys_errlist
  25 #define _sys_nerr sys_nerr
  26 #endif
  27
  28 /* Return a string describing the errno code in ERRNUM.  */
  29 char *
  30 DEFUN(_strerror_internal, (errnum, buf), int errnum AND char buf[1024])
  31 {
  32   if (errnum < 0 || errnum > _sys_nerr)
  33     {
  34       static char fmt[] = "Unknown error %d";
  35       size_t len = sprintf (buf, fmt, errnum);
  36       if (len < sizeof(fmt) - 2)
  37         return NULL;
  38       buf[len - 1] = '\0';
  39       return buf;
  40     }
  41
  42   return (char *) _sys_errlist[errnum];
  43 }