newlib/libc/sys/rdos/open.c

   1 /*#######################################################################
   2 # RDOS operating system
   3 # Copyright (C) 1988-2006, Leif Ekblad
   4 #
   5 # This library is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU Lesser General Public License as published
   7 # by the Free Software Foundation; either version 2.1 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This library 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 Lesser General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU Lesser General Public
  16 # License along with this library; if not, write to the Free Software
  17 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 #
  19 # The author of this program may be contacted at leif@rdos.net
  20 #
  21 # open.c
  22 # open function implementation
  23 #
  24 ##########################################################################*/
  25
  26 #include "config.h"
  27 #include <_ansi.h>
  28 #include <_syslist.h>
  29 #include <fcntl.h>
  30 #include <errno.h>
  31 #include "rdos.h"
  32 #include <stdarg.h>
  33
  34 int open(const char *file, int flags, ...)
  35 {
  36         int handle;
  37         int pos;
  38
  39         if (flags & O_CREAT)
  40                 handle = RdosCreateFile(file, flags);
  41         else
  42                 handle = RdosOpenFile(file, flags);
  43
  44         if (handle >= 0)
  45         {
  46                 if (flags & O_APPEND)
  47                 {
  48                         pos = RdosGetFileSize(handle);
  49                         RdosSetFilePos(handle, pos);
  50                 }
  51
  52                 if (flags & O_TRUNC)
  53                         RdosSetFileSize(handle, 0);
  54
  55                 return handle;
  56         }
  57         else
  58                 return -1;
  59 }