Feat: lab 3 w/o adv 2

lib/string.c

@@ -35,6 +35,21 @@ size_t strlen(const char *str)
   return ret;
 }
 
+char *strtok_r(char *restrict str, const char *restrict delimiters,
+               char **restrict saveptr)
+{
+  if (str)
+    *saveptr = str;
+  for (char *ret = *saveptr; **saveptr != '\0'; ++(*saveptr)) {
+    for (int i = 0; delimiters[i] != '\0'; i++)
+      if (**saveptr == delimiters[i]) {
+        *(*saveptr)++ = '\0';
+        return ret;
+      }
+  }
+  return 0x0;
+}
+
 void *memcpy(void *dest, const void *src, size_t count)
 {
   void *ret = dest;