Ruby 2.0.0p247(2013-06-27revision41674)

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memmove.c
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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 }
23