From 5cd97e44e267faf66f3abb239c70018b8cbcc1d7 Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Thu, 23 Feb 2023 15:57:33 +0200
Subject: [PATCH] LibC: Add strcmp and strncmp

---
 libc/Makefile           |  2 ++
 libc/include/string.h   |  3 +++
 libc/string/strcmp.cpp  | 11 +++++++++++
 libc/string/strncmp.cpp | 11 +++++++++++
 4 files changed, 27 insertions(+)
 create mode 100644 libc/string/strcmp.cpp
 create mode 100644 libc/string/strncmp.cpp

diff --git a/libc/Makefile b/libc/Makefile
index 97da9536c..45fbf117c 100644
--- a/libc/Makefile
+++ b/libc/Makefile
@@ -40,6 +40,8 @@ string/memcmp.o \
 string/memcpy.o \
 string/memmove.o \
 string/memset.o \
+string/strcmp.o \
+string/strncmp.o \
 string/strcpy.o \
 string/strlen.o \
 string/strncpy.o \
diff --git a/libc/include/string.h b/libc/include/string.h
index 1675097d6..491a36a31 100644
--- a/libc/include/string.h
+++ b/libc/include/string.h
@@ -11,6 +11,9 @@ void* memmove(void*, const void*, size_t);
 void* memset(void*, int, size_t);
 size_t strlen(const char*);
 
+int strcmp(const char*, const char*);
+int strncmp(const char*, const char*, size_t);
+
 char* strcpy(char* __restrict, const char* __restrict);
 char* strncpy(char* __restrict, const char* __restrict, size_t);
 
diff --git a/libc/string/strcmp.cpp b/libc/string/strcmp.cpp
new file mode 100644
index 000000000..343d83691
--- /dev/null
+++ b/libc/string/strcmp.cpp
@@ -0,0 +1,11 @@
+#include <string.h>
+
+int strcmp(const char* s1, const char* s2)
+{
+	const unsigned char* u1 = (unsigned char*)s1;
+	const unsigned char* u2 = (unsigned char*)s2;
+	for (; *u1 && *u2; u1++, u2++)
+		if (*u1 != *u2)
+			break;
+	return *u1 - *u2;
+}
diff --git a/libc/string/strncmp.cpp b/libc/string/strncmp.cpp
new file mode 100644
index 000000000..b4cf3b797
--- /dev/null
+++ b/libc/string/strncmp.cpp
@@ -0,0 +1,11 @@
+#include <string.h>
+
+int strncmp(const char* s1, const char* s2, size_t n)
+{
+	const unsigned char* u1 = (unsigned char*)s1;
+	const unsigned char* u2 = (unsigned char*)s2;
+	for (; --n && *u1 && *u2; u1++, u2++)
+		if (*u1 != *u2)
+			break;
+	return *u1 - *u2;
+}