libc/stdio/fopen.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 <errno.h>
  21 #include <stdio.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24 #include <stdlib.h>
  25
  26 FILE *fopen (const char *filename, const char *mode)
  27 {
  28         int flags = 0;
  29
  30         /* TODO - provizorni .. dodelat dalsi mody */
  31         if (mode) {
  32                 if (mode[0] == 'r')
  33                         flags |= O_RDONLY;
  34                 if (mode[0] == 'w')
  35                         flags |= O_WRONLY;
  36         }
  37
  38         int fd = open (filename, flags);
  39
  40         if (fd < 0)
  41                 return 0;
  42
  43         int l = lseek (fd, 0, SEEK_END);
  44
  45         lseek (fd, 0, SEEK_SET);
  46
  47         FILE *f = (FILE *) malloc (sizeof (FILE));
  48
  49         if (!f)
  50                 return 0;
  51
  52         f->mode = flags;
  53         f->fd = fd;
  54         f->e = (unsigned) l;
  55
  56         errno_update ();
  57
  58         return f;
  59 }