From fbf131b5c043b27e0b1543374bb144e3e426f723 Mon Sep 17 00:00:00 2001
From: Tyler Murphy <=>
Date: Sun, 16 Jul 2023 02:54:32 -0400
Subject: initial

---
 libk/src/string.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 libk/src/string.c

(limited to 'libk/src/string.c')

diff --git a/libk/src/string.c b/libk/src/string.c
new file mode 100644
index 0000000..6dfa683
--- /dev/null
+++ b/libk/src/string.c
@@ -0,0 +1,61 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+int memcmp(const void *vl, const void *vr, size_t n) {
+    const unsigned char *l = vl, *r = vr;
+    for (; n && *l == *r; n--, l++, r++);
+    return n ? *l-*r : 0;
+}
+
+void *memcpy(void *restrict dest, const void *restrict src, size_t n) {
+    char *d = dest;
+    const char *s = src;
+    for (; n; n--) *d++ = *s++;
+    return dest;
+}
+
+void *memmove(void *dest, const 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;
+}
+
+void *memset(void *dest, int c, size_t n) {
+    unsigned char *d = dest;
+    for (; n; n--) *d++ = c;
+    return dest;
+}
+
+char *strcpy(char *restrict dest, const char *restrict src) {
+	for(; (*dest = *src); dest++, src++);
+	return dest;
+}
+
+char *strncpy(char *restrict dest, const char *restrict src, size_t n) {
+	for(; (*dest = *src) && n; dest++, src++, n--);
+	memset(dest, 0, n);
+	return dest;
+}
+
+size_t strlen(const char *s) {
+    size_t len = 0;
+    for(; *s; s++, len++);
+    return len;
+}
+
+int strncmp(const char* lhs, const char* rhs, size_t n) {
+	const unsigned char *l=(void *)lhs, *r=(void *)rhs;
+	if (!n--) return 0;
+	for (; *l && *r && n && *l == *r ; l++, r++, n--);
+	return *l - *r;
+}
-- 
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