libc/stdio/fseek.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2009  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program 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
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #include <stdio.h>
  21 #include <unistd.h>
  22
  23 int fseek (FILE *stream, long offset, int whence)
  24 {
  25         if (!stream)
  26                 return -1;
  27
  28         long r = lseek (stream->fd, offset, whence);
  29
  30         if (r > 0)
  31                 stream->off = r;
  32
  33         if (whence == SEEK_END)
  34                 return 0;
  35
  36         return r;
  37 }
  38
  39 int fseeko (FILE *stream, off_t offset, int whence)
  40 {
  41         if (!stream)
  42                 return -1;
  43
  44         return lseek (stream->fd, offset, whence);
  45 }