stdio/ferror.c

   1 /* Copyright (C) 1991, 1996, 1997, 1998 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 Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the 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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <stdio.h>
  21
  22 #undef  ferror
  23 #undef  ferror_unlocked
  24
  25
  26 /* Return non-zero if STREAM has its error indicator set.  */
  27 int
  28 ferror (stream)
  29      FILE *stream;
  30 {
  31   if (!__validfp (stream))
  32     {
  33       __set_errno (EINVAL);
  34       return -1;
  35     }
  36
  37   return stream->__error;
  38 }
  39
  40 weak_alias (ferror, ferror_unlocked)