#include <assert.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>

int main(void) {
  /* memcpy */
  char src[] = "hello world";
  char dst[64];
  memcpy(dst, src, 12);
  dst[12] = 0;
  assert(strcmp(dst, "hello world") == 0);

  /* strlen */
  assert(strlen("") == 0);
  assert(strlen("abc") == 3);

  /* memset */
  char buf[10];
  memset(buf, 0xAB, 10);
  for (int i = 0; i < 10; i++) assert((unsigned char)buf[i] == 0xAB);

  /* memcmp */
  assert(memcmp("abc", "abc", 3) == 0);
  assert(memcmp("abc", "abd", 3) < 0);

  /* strcmp */
  assert(strcmp("hello", "hello") == 0);
  assert(strcmp("abc", "def") < 0);

  printf("ALL STRING TESTS PASSED\n");
  return 0;
}