compiler/clib/freopen.c

   1 /*
   2     Copyright © 1995-2003, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     ANSI function freopen().
   6 */
   7
   8 #include <errno.h>
   9
  10 #include "__fdesc.h"
  11 #include "__stdio.h"
  12
  13 /*****************************************************************************
  14
  15     NAME */
  16 #include <stdio.h>
  17
  18         FILE *freopen (
  19
  20 /*  SYNOPSIS */
  21         const char *path,
  22         const char *mode,
  23         FILE       *stream
  24         )
  25
  26 /*  FUNCTION
  27         Opens the  file whose name is the string pointed to by path  and
  28         associates  the  stream  pointed to by stream with it.
  29
  30     INPUTS
  31         path   - the file to open
  32         mode   - The mode of the stream  (same as with fopen()) must be com
  33                  patible with the mode of the file  descriptor.   The  file
  34                  position  indicator  of  the  new  stream  is  set to that
  35                  belonging to fildes, and the error and end-of-file indica
  36                  tors  are cleared.  Modes "w" or "w+" do not cause trunca
  37                  tion of the file.  The file descriptor is not dup'ed,  and
  38                  will  be  closed  when  the  stream  created  by fdopen is
  39                  closed.
  40         stream - the stream to wich the file will be associated.
  41
  42     RESULT
  43         NULL on error or stream.
  44
  45     NOTES
  46
  47     EXAMPLE
  48
  49     BUGS
  50
  51     SEE ALSO
  52          open(), fclose(), fileno()
  53
  54     INTERNALS
  55
  56 ******************************************************************************/
  57 {
  58     int fd, oflags;
  59
  60     if (!(path && mode && stream))
  61     {
  62         errno = EFAULT;
  63         return NULL;
  64     }
  65
  66     oflags = __smode2oflags(mode);
  67     fd = __open(stream->fd, path, oflags, 644);
  68
  69     if (fd == -1)
  70         return NULL;
  71
  72     stream->flags = __oflags2sflags(oflags);
  73
  74     return stream;
  75 }