libiberty/rename.c

   1 /* rename -- rename a file
   2    This function is in the public domain. */
   3
   4 /*
   5
   6 @deftypefn Supplemental int rename (const char *@var{old}, const char *@var{new})
   7
   8 Renames a file from @var{old} to @var{new}.  If @var{new} already
   9 exists, it is removed.
  10
  11 @end deftypefn
  12
  13 */
  14
  15 #ifdef HAVE_CONFIG_H
  16 #include "config.h"
  17 #endif
  18 #include <errno.h>
  19 #ifdef HAVE_UNISTD_H
  20 #include <unistd.h>
  21 #endif
  22
  23 int
  24 rename (zfrom, zto)
  25      char *zfrom;
  26      char *zto;
  27 {
  28   if (link (zfrom, zto) < 0)
  29     {
  30       if (errno != EEXIST)
  31         return -1;
  32       if (unlink (zto) < 0
  33           || link (zfrom, zto) < 0)
  34         return -1;
  35     }
  36   return unlink (zfrom);
  37 }