volatile string fns

3 files changed, 41 insertions, 0 deletions

diff --git a/lib/memcpyv.c b/lib/memcpyv.c
new file mode 100644
index 0000000..205d9c1
--- /dev/null
+++ b/lib/memcpyv.c
@@ -0,0 +1,11 @@
+#include <string.h>
+
+void *memcpyv(volatile void *restrict dest, const volatile void *restrict src,
+			  size_t n)
+{
+	char *d = dest;
+	const char *s = src;
+	for (; n; n--)
+		*d++ = *s++;
+	return dest;
+}
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;
+}
diff --git a/lib/memsetv.c b/lib/memsetv.c
new file mode 100644
index 0000000..9039cb7
--- /dev/null
+++ b/lib/memsetv.c
@@ -0,0 +1,10 @@
+#include <string.h>
+
+void *memsetv(volatile void *dest, int c, size_t n)
+{
+	unsigned char *d = dest;
+	for (; n; n--) {
+		*d++ = c;
+	};
+	return dest;
+}