modified some syscall code in rlibc, fs stuff

kernel/lib/memory.c

@@ -38,6 +38,26 @@ int strlen(const char* str) {
     return len;
 }
 
+int strncmp(const char *s1, const char *s2, size_t n) {
+    // If n is 0, we don't compare anything and strings are "equal"
+    while (n > 0) {
+        // If characters don't match, or we hit the null-terminator of s1
+        if (*s1 != *s2) {
+            return *(unsigned char *)s1 - *(unsigned char *)s2;
+        }
+        
+        // If we reached the end of the strings simultaneously
+        if (*s1 == '\0') {
+            break;
+        }
+        
+        s1++;
+        s2++;
+        n--;
+    }
+    return 0;
+}
+
 static void* kernel_heap_start = (void*)KHEAP_START;
 static void* kernel_heap_end = (void*)KHEAP_START;
 alloc_header_t* blk_list = NULL;