feature: a lot of stuff and got to a working command line ish

kernel/libc/string.c

@@ -0,0 +1,60 @@
+//
+// Created by rick on 01-02-21.
+//
+
+#include "string.h"
+#include "stdbool.h"
+#include <libc/libc.h>
+#include <types.h>
+
+int strcpy(char *dst, char *src) {
+    return memcpy(dst, src, strlen(src) + 1);
+}
+
+int strlen(const char *str) {
+    int length = 0;
+    while (str[length] != 0) {
+        length++;
+    }
+    return length;
+}
+
+int strcmp(const char *s1, const char *s2) {
+    int len1 = strlen(s1);
+    int len2 = strlen(s1);
+    return strncmp(s1, s2, maxi(len1, len2));
+}
+
+const char *strchr(const char *s, char c) {
+    int index = 0;
+    while (true) {
+        if (s[index] == c) {
+            return &s[index];
+        }
+        if (s[index] == 0) {
+            return NULL;
+        }
+        index++;
+    }
+}
+
+int strncmp(const char *s1, const char *s2, int n) {
+    for (int i = 0; i < n; ++i) {
+        if (s1[i] == 0 && s2[i] == 0) {
+            return 0;
+        }
+        if (s1[i] == 0) {
+            return -1;
+        }
+        if (s2[i] == 0) {
+            return 1;
+        }
+        if (s1[i] > s2[i]) {
+            return -1;
+        }
+        if (s2[i] < s1[i]) {
+            return 1;
+        }
+    }
+    return 0;
+}