added tag v1_9_0_4

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 21 insertions, 0 deletions

diff --git a/trunk/missing/memmove.c b/trunk/missing/memmove.c
new file mode 100644
index 0000000000..19c5f18847
--- /dev/null
+++ b/trunk/missing/memmove.c
@@ -0,0 +1,21 @@
+/* public domain rewrite of memcmp(3) */
+
+#include <stddef.h>
+
+void *
+memmove(void *d, const void *s, size_t n)
+{
+    char *dst = (char *)d;
+    const char *src = (const char *)s;
+
+    if (src < dst) {
+	src += n;
+	dst += n;
+	for (; n; --n)
+	    *--dst = *--src;
+    }
+    else if (dst < src)
+	for (; n; --n)
+	    *dst++ = *src++;
+    return d;
+}