Hello world over serial

kernel/libk/string.c

@@ -0,0 +1,44 @@
+#include <libk/std.h>
+#include <libk/string.h>
+
+size_t memset(void *dst, uint8_t b, size_t n) {
+  uint8_t *dst1 = dst;
+  size_t i;
+  for (i = 0; i < n; i++)
+    dst1[i] = b;
+  return i;
+}
+
+size_t memcpy(void *dst, const void *src, size_t n) {
+  uint8_t *dst1 = dst;
+  const uint8_t *src1 = src;
+  size_t i;
+  for (i = 0; i < n; i++)
+    dst1[i] = src1[i];
+  return i;
+}
+
+// SOURCE: https://stackoverflow.com/a/48967408
+void strncpy(char* dst, const char* src, size_t n) {
+   size_t i = 0;
+   while(i++ != n && (*dst++ = *src++));
+}
+
+size_t strlen(const char *str) {
+  const char *s;
+  for (s = str; *s; ++s);
+  return (s - str);
+}
+
+int memcmp(const void *s1, const void *s2, size_t n) {
+  unsigned char *p = (unsigned char *)s1;
+  unsigned char *q = (unsigned char *)s2;
+
+  while (n--) {
+    if (*p != *q) {
+      return (int)*p - (int)*q;
+    }
+    p++, q++;
+  }
+  return 0;
+}