libk: create a subset libc for kernel use

Create a subset of the C library for use inside the kernel.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 7 insertions, 4 deletions

diff --git a/kernel/string.c b/libk/string.c
index fa0fd3f..be59397 100644
--- a/kernel/string.c
+++ b/libk/string.c
@@ -1,4 +1,4 @@
-#include <kernel/string.h>
+#include <libk/string.h>
 
 int memcmp(const void *str1, const void *str2, size_t n) {
         unsigned char const *p1 = str1;
@@ -32,16 +32,15 @@ void* memcpy(void* __restrict dest, const void* __restrict src, size_t n) {
 }
 
 char* strncpy(char* __restrict dest, const char* __restrict src, size_t n) {
-        for (int i = 0; i < n; i++) {
+        for (size_t i = 0; i < n; i++) {
                 if (src[i] == '\0')
                         break;
                 dest[i] = src[i];
         }
+        return dest;
 }
 
 char* strcpy(char* __restrict dest, const char* __restrict src) {
-        if (strlen(src) > strlen(dest))
-                return NULL;
         return (char*)memcpy(dest, src, strlen(src));
 }
 
@@ -49,6 +48,10 @@ char* strcat(char* __restrict dest, const char* __restrict src) {
         return (char*)memcpy(&dest[strlen(dest)], src, strlen(src));
 }
 
+char* strncat(char* __restrict dest, const char* __restrict src, size_t n) {
+        return (char*)memcpy(&dest[strlen(dest)], src, n);
+}
+
 void* memmove(void* __restrict dest, const void* __restrict src, size_t n) {
         if (dest == src)
                 return dest;