#include <stdint.h>
#include <stddef.h>
#include "hal.h"

void *hal_memset(void *p, int c, size_t n) {
  char *cp = p;
  for (size_t i = 0; i < n; i++) cp[i] = c;
  return p;
}

void *hal_memcpy(void *dst, const void *src, size_t n) {
  char *a = dst;
  const char *b = src;
  for (size_t i = 0; i < n; i++) a[i] = b[i];
  return dst;
}

size_t hal_strlen(char *s) {
  char *s2;
  for (s2 = s; *s2; ++s2);
  return (s2 - s);
}

// https://aticleworld.com/memcmp-in-c/
int hal_memcmp(const void *s1, const void *s2, int len)
{
    unsigned char *p = s1;
    unsigned char *q = s2;
    int charCompareStatus = 0;
    //If both pointer pointing same memory block
    if (s1 == s2)
    {
        return charCompareStatus;
    }
    while (len > 0)
    {
        if (*p != *q)
        {  //compare the mismatching character
            charCompareStatus = (*p >*q)?1:-1;
            break;
        }
        len--;
        p++;
        q++;
    }
    return charCompareStatus;
}