missing/memmove.c

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