Fresh start

1 files changed, 22 insertions, 0 deletions

diff --git a/jni/ruby/missing/memmove.c b/jni/ruby/missing/memmove.c
new file mode 100644
index 0000000..e8e17e8
--- /dev/null
+++ b/jni/ruby/missing/memmove.c
@@ -0,0 +1,22 @@
+/* public domain rewrite of memcmp(3) */
+
+#include "ruby/missing.h"
+#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;
+}