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samefile.c

/*                                                            -*- C -*-
 * Copyright (c) 1998, 2000, 01  
 *    Motoyuki Kasahara
 *
 * 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, 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.
 */

/*
 * This program requires the following Autoconf macros:
 *   AC_C_CONST
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

/*
 * If the files `file_name1' and `file_name2' are identical (i.e. the are
 * written on a same device and a same i-node is assigned to them), 1 is
 * returned.  Otherwise, 0 is returned.
 */
int
is_same_file(file_name1, file_name2)
    const char *file_name1;
    const char *file_name2;
{
    struct stat st1, st2;

    if (stat(file_name1, &st1) != 0 || stat(file_name2, &st2) != 0)
      return 0;

#ifndef DOS_FILE_PATH
    if (st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino)
      return 0;

#else /* DOS_FILE_PATH */
    /* Can't rely on st_ino and st_dev, use other fields: */
    if (st1.st_mode != st2.st_mode
      || st1.st_uid != st2.st_uid
      || st1.st_gid != st2.st_gid
      || st1.st_size != st2.st_size
      || st1.st_atime != st2.st_atime
      || st1.st_mtime != st2.st_mtime
      || st1.st_ctime != st2.st_ctime)
      return 0;
#endif /* DOS_FILE_PATH */

    return 1;
}

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