OrionLibC

diff --git a/string/memcmp.c b/string/memcmp.c
new file mode 100644
index 0000000..e4c18fc
--- /dev/null
+++ b/string/memcmp.c
@@ -0,0 +1,13 @@
+#include <stddef.h>
+
+/* Copy one region of memory to another */
+int
+memcmp(void *s1, void *s2, size_t n)
+{
+	unsigned char *a = (unsigned char *) s1,
+	              *b = (unsigned char *) s2;
+	while (n-- > 0)
+			if (*a++ != *b++)
+				return a[-1] - b[-1];
+	return 0;
+}
diff --git a/string/memcpy.c b/string/memcpy.c
new file mode 100644
index 0000000..4988f38
--- /dev/null
+++ b/string/memcpy.c
@@ -0,0 +1,12 @@
+#include <stddef.h>
+
+/* Copy one region of memory to another */
+void *
+memcpy(void *dest, void *src, size_t n)
+{
+	unsigned char *a = (unsigned char *) dest,
+	              *b = (unsigned char *) src;
+	while (n-- > 0)
+		*a++ = *b++;
+	return dest;
+}
diff --git a/string/memset.c b/string/memset.c
new file mode 100644
index 0000000..f9c0902
--- /dev/null
+++ b/string/memset.c
@@ -0,0 +1,13 @@
+#include <stddef.h>
+
+/* Fill a region of memory with specified byte */
+void *
+memset(void *dest, int byte, size_t len)
+{
+	unsigned char *a = dest;
+	if (len > 0)  {
+		while (len-- > 0)
+			*a++ = byte;
+	}
+	return dest;
+}
diff --git a/string/strcmp.c b/string/strcmp.c
new file mode 100644
index 0000000..37b62a4
--- /dev/null
+++ b/string/strcmp.c
@@ -0,0 +1,18 @@
+#include <stddef.h>
+
+/* Compare two strings */
+int
+strcmp(char *s1, char *s2)
+{
+	for (; *s1 == *s2 && *s1 && *s2; s1++, s2++);
+	return *(unsigned char *) s1 - *(unsigned char *) s2;
+}
+
+/* Compare two limited strings */
+int
+strncmp(char *s1, char *s2, size_t n)
+{
+	if (!n--) return 0;
+	for (; *s1 == *s2 && *s1 && *s2 && n; s1++, s2++, n--);
+	return *(unsigned char *) s1 - *(unsigned char *) s2;
+}
diff --git a/string/strcpy.c b/string/strcpy.c
new file mode 100644
index 0000000..ce725a2
--- /dev/null
+++ b/string/strcpy.c
@@ -0,0 +1,23 @@
+#include <stddef.h>
+
+/* Copy a string */
+char *
+strcpy(char *dest, const char *src)
+{
+	char *ret = dest;
+	while (*src)
+		*dest++ = *src++;
+	*dest = '\0';
+	return ret;
+}
+
+/* Copy a limited string */
+char *
+strncpy(char *dest, const char *src, size_t n)
+{
+	char *ret = dest;
+	while (*src && n--)
+		*dest++ = *src++;
+	*dest = '\0';
+	return ret;
+}
diff --git a/string/strlen.c b/string/strlen.c
new file mode 100644
index 0000000..a8d506c
--- /dev/null
+++ b/string/strlen.c
@@ -0,0 +1,12 @@
+#include <string.h>
+
+/* Find length of string */
+size_t
+strlen(const char *str)
+{
+	if (!str)
+		return 0;
+	size_t i;
+	for (i = 0; str[i]; i++);
+	return i;
+}