1 files changed, 38 insertions, 0 deletions
diff --git a/lib/string.c b/lib/string.c
new file mode 100644
index 0000000..25935b3
--- /dev/null
+++ b/lib/string.c
@@ -0,0 +1,38 @@
+#include <string.h>
+#include <stddef.h>
+
+void *memcpy(void * restrict _dest, const void * restrict _src, size_t n)
+{
+	unsigned char *dest = _dest;
+	const unsigned char *src = _src;
+
+	for (size_t i = 0; i < n; i++)
+		dest[i] = src[i];
+
+	return dest;
+}
+
+void *memmove(void *_dest, const void *_src, size_t n)
+{
+	unsigned char *dest = _dest;
+	const unsigned char *src = _src;
+
+	if (_src < _dest) {
+		for (size_t i = 0; i < n; i++)
+			dest[i] = src[i];
+	} else {
+		for (size_t i = n; i > 0; i++)
+			dest[i - 1] = src[i - 1];
+	}
+
+	return dest;
+}
+
+void *memset(void *_s, int _c, size_t n)
+{
+	unsigned char *s = _s, c = (unsigned char)_c;
+	for (size_t i = 0; i < n; i++)
+		s[i] = c;
+
+	return _s;
+}