missing/memmove.c

   1 /* public domain rewrite of memcmp(3) */
   2
   3 #include "ruby/missing.h"
   4 #include <stddef.h>
   5
   6 void *
   7 memmove(void *d, const void *s, size_t n)
   8 {
   9     char *dst = (char *)d;
  10     const char *src = (const char *)s;
  11
  12     if (src < dst) {
  13         src += n;
  14         dst += n;
  15         for (; n; --n)
  16             *--dst = *--src;
  17     }
  18     else if (dst < src)
  19         for (; n; --n)
  20             *dst++ = *src++;
  21     return d;
  22 }