Major restructure

kern/libkern/string.h

@@ -1,7 +1,45 @@
-#pragma once
-#include <types.h>
+#ifndef KERNEL_STRING_H
+#define KERNEL_STRING_H
 
-void *memcpy(void *s1, const void *s2, size_t n);
-void *memmove(void *s1, const void *s2, size_t n);
-void *memset(void *dest, int c, size_t n);
-int   memcmp(const void *s1, const void *s2, size_t n);
+#include <stdint.h>
+
+// void *memcpy(void *s1, const void *s2, size_t n);
+// void *memmove(void *s1, const void *s2, size_t n);
+// void *memset(void *dest, int c, size_t n);
+// int   memcmp(const void *s1, const void *s2, size_t n);
+
+/** Integer to ascii */
+char *itoa(int value, char *str, int base);
+
+/** Fill memory with constant byte */
+void *memset(void *dst, int c, size_t len);
+
+/** Copy `len` bytes from `src` to `dst`. Undefined if regions overlap. */
+void *memcpy(void *dst, const void *src, size_t len);
+
+/** Copy `len` bytes from `src` to `dst`, safe for overlapping regions. */
+void *memmove(void *dst, const void *src, size_t len);
+
+/** Compare `len` bytes of `s1` and `s2`.
+ *  Returns 0 if equal, <0 if s1 < s2, >0 if s1 > s2. */
+int memcmp(const void *s1, const void *s2, size_t len);
+
+/** Returns the length of a null-terminated string */
+size_t strlen(const char *s);
+
+/** Return length of string `s`, up to a max of `maxlen` bytes */
+size_t strnlen(const char *s, size_t maxlen);
+
+// TODO: These:
+/*
+int    strcmp(const char *s1, const char *s2);
+int    strncmp(const char *s1, const char *s2, size_t n);
+
+char  *strcpy(char *dst, const char *src);
+char  *strncpy(char *dst, const char *src, size_t n);
+
+char  *strchr(const char *s, int c);
+char  *strrchr(const char *s, int c);
+*/
+
+#endif