libiberty/rename.c

   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
  14 int
  15 rename (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 }