From fcbf63e62c627deae76c1b8cb8c0876c536ed811 Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <jari.vetoniemi@indooratlas.com>
Date: Mon, 16 Mar 2020 18:49:26 +0900
Subject: Fresh start

---
 jni/ruby/missing/memmove.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 jni/ruby/missing/memmove.c

(limited to 'jni/ruby/missing/memmove.c')

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;
+}
-- 
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