Add build system scaffolding and libc headers

1 files changed, 23 insertions, 0 deletions

diff --git a/lib/libc/string/strcmp.c b/lib/libc/string/strcmp.c
new file mode 100644
index 00000000..836522f1
--- /dev/null
+++ b/lib/libc/string/strcmp.c
@@ -0,0 +1,23 @@
+#include <stddef.h>
+
+int strcmp(const char *s1, const char *s2)
+{
+	const unsigned char *p1 = (const unsigned char *)s1;
+	const unsigned char *p2 = (const unsigned char *)s2;
+
+	if (p1 == NULL && p2 == NULL)
+		return 0;
+
+	if (p1 == NULL)
+		return -1;
+
+	if (p2 == NULL)
+		return 1;
+
+	while (*p1 == *p2 && *p1 != '\0') {
+		p1++;
+		p2++;
+	}
+
+	return *p1 - *p2;
+}