kernel/lib/stdio/fopen.c

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   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 <system.h>
  21 #include <file.h>
  22
  23 fd_t fd_list;
  24
  25 static fd_t *getbyfd (int id)
  26 {
  27         fd_t *fd;
  28         for (fd = fd_list.next; fd != &fd_list; fd = fd->next) {
  29                 if (fd->id == id)
  30                         return fd;
  31         }
  32 }
  33
  34 FILE *fopen (const char *filename, const char *mode)
  35 {
  36         int flags = 0;
  37
  38         /* TODO - provizorni .. dodelat dalsi mody */
  39         if (mode) {
  40                 if (mode[0] == 'r')
  41                         flags |= O_RDONLY;
  42                 if (mode[0] == 'w')
  43                         flags |= O_WRONLY;
  44         }
  45
  46         int fd = open (filename, flags);
  47
  48         if (!fd)
  49                 return 0;
  50
  51         fd_t *d = getbyfd (fd);
  52         FILE *f = malloc (sizeof (FILE));
  53
  54         if (!f || !d)
  55                 return 0;
  56
  57         f->mode = flags;
  58         f->fd = fd;
  59         f->ptr = d->s;
  60
  61         return f;
  62 }