#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "myString.h"

struct string {
    int length;
    char *data;
};

struct string *
makeString(const char *s)
{
    struct string *s2;

    s2 = malloc(sizeof(struct string));
    if(s2 == 0) { return 0; }  /* let caller worry about malloc failures */

    s2->length = strlen(s);

    // s2->data = malloc(s2->length );
    // s2->data = malloc(s2->length + 1);
    s2->data = calloc(s2->length + 1, sizeof(s[0]));  // initialized to 0
    if(s2->data == 0) {
	free(s2);
	return 0;
    }

    strncpy(s2->data, s, s2->length);
    // s2->data[s2->length] = '\0';

    return s2;
}

void
destroyString(struct string *s)
{
    free(s->data);
    free(s);
}

int
stringLength(struct string *s)
{
    return s->length;
}

int
stringCharAt(struct string *s, int index)
{
    if(index < 0 || index >= s->length) {
	return -1;
    } else {
	return s->data[index];
    }
}




int
main(int argc, char **argv)
{
  struct string *s = makeString("this is a string test.");
  struct string *s2 = makeString("this is also a string test.");
  
  printf("String: %s, length = %d\n", s->data, stringLength(s));
  printf("String: %s, length = %d\n", s2->data, stringLength(s2));

  for(int i=0; i < s2->length; i++, i++){
    printf("s[%d] = %c\n", i, stringCharAt(s2,i));
  }

  destroyString(s);
  destroyString(s2);
  return 0;
}