/* setvbuf.c (emx+gcc) -- Copyright (c) 1990-1993 by Eberhard Mattes */

#include <sys/emx.h>
#include <stdio.h>
#include <stdlib.h>

int setvbuf (FILE *stream, char *buffer, int mode, size_t size)
{
  if (!(stream->flags & _IOOPEN) ||
      (mode != _IONBF && mode != _IOFBF && mode != _IOLBF) ||
      (mode != _IONBF && size <= 0))
    return (EOF);
  fflush (stream);
  if ((stream->flags & _IOBUFMASK) == _IOBUFLIB)
    free (stream->buffer);
  stream->flags &= ~(_IOBUFMASK|_IOLBF|_IOFBF|_IONBF);
  if (mode == _IONBF)
    {
      stream->buf_size = 1;
      stream->buffer = &stream->char_buf;
      stream->flags |= _IONBF|_IOBUFCHAR;
    }
  else if (buffer != NULL)
    {
      stream->buf_size = size;
      stream->buffer = buffer;
      stream->flags |= mode|_IOBUFUSER;
    }
  else
    {
      buffer = malloc (size);
      if (buffer == NULL)
        return (EOF);
      stream->buf_size = size;
      stream->buffer = buffer;
      stream->flags |= mode|_IOBUFLIB;
    }
  stream->ptr = stream->buffer;
  stream->rcount = 0;
  stream->wcount = 0;
  return (0);
}