#define RCSID "$Id: SafeIO.c,v 1.6 2006/02/26 16:34:28 geuzaine Exp $"
/*
 * Copyright (C) 1997-2006 P. Dular, C. Geuzaine
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA.
 *
 * Please report all bugs and problems to <getdp@geuz.org>.
 */

#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "SafeIO.h"
#include "Message.h"

/*
  Safe fprintf routine

  In a perfect world, one should use this routine. Unfortunately, it
  is very, very slow.

  We should use a macro, i.e.

    #define gprintf(...) { fprintf(__VA_ARGS__); ... }

  but but var args don't work with all C preprocessors.

  Bottom line: don't use safe_fprintf.
*/

int safe_fprintf(FILE *stream, char *fmt, ...){
  va_list  args;

  va_start (args, fmt);
  vfprintf(stream, fmt, args); 
  va_end (args);

  if(ferror(stream)){
    Msg(GERROR, strerror(errno));
    clearerr(stream);
    return 1;
  }
    
  return 0;
}

/* Safe fwrite routine */

int safe_fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream){
  size_t result = fwrite(ptr, size, nmemb, stream);

  if(result < nmemb){
    if(result >= 0) /* Partial write */
      Msg(GERROR, "Disk full");
    else
      Msg(GERROR, strerror(errno));
    if(fflush(stream) < 0)
      Msg(GERROR, "EOF reached");
    if(fclose(stream) < 0)
      Msg(GERROR, strerror(errno));
    return 1;
  }
  return 0;
}