rename.c revision 77298 
1/* rename -- rename a file
2   This function is in the public domain. */
3
4/* Rename a file.  */
5
6#ifdef HAVE_CONFIG_H
7#include "config.h"
8#endif
9#include <errno.h>
10#ifdef HAVE_UNISTD_H
11#include <unistd.h>
12#endif
13
14int
15rename (zfrom, zto)
16     char *zfrom;
17     char *zto;
18{
19  if (link (zfrom, zto) < 0)
20    {
21      if (errno != EEXIST)
22	return -1;
23      if (unlink (zto) < 0
24	  || link (zfrom, zto) < 0)
25	return -1;
26    }
27  return unlink (zfrom);
28}
29