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/* unlink-if-ordinary.c - remove link to a file unless it is special

   Copyright (C) 2004, 2005 Free Software Foundation, Inc.

This file is part of the libiberty library.  This library 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 library 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 GNU CC; see the file COPYING.  If not, write to

the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.

As a special exception, if you link this library with files

compiled with a GNU compiler to produce an executable, this does not cause

the resulting executable to be covered by the GNU General Public License.

This exception does not however invalidate any other reasons why

the executable file might be covered by the GNU General Public License. */

/*

@deftypefn Supplemental int unlink_if_ordinary (const char*)

Unlinks the named file, unless it is special (e.g. a device file).

Returns 0 when the file was unlinked, a negative value (and errno set) when

there was an error deleting the file, and a positive value if no attempt

was made to unlink the file because it is special.

@end deftypefn

*/

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <sys/types.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#if HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif

#include "libiberty.h"

#ifndef S_ISLNK

#ifdef S_IFLNK

#define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK)

#else

#define S_ISLNK(m) 0

#define lstat stat

#endif

#endif

int

unlink_if_ordinary (const char *name)

{

  struct stat st;

  if (lstat (name, &st) == 0

      && (S_ISREG (st.st_mode) || S_ISLNK (st.st_mode)))

    return unlink (name);

  return 1;

}