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/* rename -- rename a file

   This function is in the public domain. */

/* Rename a file.  */

#include <errno.h>

int

rename (zfrom, zto)

     char *zfrom;

     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);

}