volatile string fns

1 files changed, 20 insertions, 0 deletions

diff --git a/lib/memmovev.c b/lib/memmovev.c
new file mode 100644
index 0000000..d2fc683
--- /dev/null
+++ b/lib/memmovev.c
@@ -0,0 +1,20 @@
+#include <string.h>
+
+void *memmovev(volatile void *dest, const volatile void *src, size_t n)
+{
+	char *d = dest;
+	const char *s = src;
+
+	if (d == s)
+		return d;
+
+	if (d < s) {
+		for (; n; n--)
+			*d++ = *s++;
+	} else {
+		while (n)
+			n--, d[n] = s[n];
+	}
+
+	return dest;
+}