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/* rename -- rename a file

   This function is in the public domain. */

/*

@deftypefn Supplemental int rename (const char *@var{old}, const char *@var{new})

Renames a file from @var{old} to @var{new}.  If @var{new} already

exists, it is removed.

@end deftypefn

*/

#include "ansidecl.h"

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <errno.h>

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

int

rename (const char *zfrom, const char *zto)

{

  if (link (zfrom, zto) < 0)

    {

      if (errno != EEXIST)

        return -1;

      if (unlink (zto) < 0

          || link (zfrom, zto) < 0)

        return -1;

    }

  return unlink (zfrom);

}