#include "str.h"

void str_init(str_t* str)
{
  assert(str);
  str->data = NULL;
  str->size = 0;
  str->cap = 0;
}

void str_free(str_t* str)
{
  assert(str);

  free(str->data);
  str->data = NULL;
  str->size = 0;
  str->cap = 0;
}

void str_resize(str_t* str)
{
  assert(str);

  if (str->data == NULL)
    {
      str->cap = 2;
      str->data = calloc(str->cap + 1, sizeof(char));
    }

  if (str->size >= str->cap)
    {
      str->cap *= 2;
      str->data = realloc(str->data, sizeof(char) * (str->cap + 1));
    }
}

void str_push(str_t* str, char c)
{
  assert(str);

  str_resize(str);
  str->data[str->size] = c;

  str_resize(str);
  str->data[str->size + 1] = '\0';
  str->size++;
}

void str_append(str_t* str, char const* src)
{
  assert(str);
  assert(src);

  size_t len = strlen(src);

  for (size_t i=0; i<len; i++)
    {
      str_push(str, src[i]);
    }
}

int str_empty(str_t* str)
{
  assert(str);
  return str->size == 0;
}