#include "my_string.h"

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

stream_t        init()
{
  stream_t      s;

  s.str = NULL;
  s.size = 0;
  s.limit = 0;

  return s;
}

stream_t        create(char* str)
{
  stream_t      s;
  int           size;
  int           k;

  size = strlen(str);
  k = size / BUF_SIZE + 1;

  s.str = (char*) malloc (k * BUF_SIZE * sizeof(char));
  strcpy(s.str, str);
  s.size = size;
  s.limit = k * BUF_SIZE;

  return s;
}

void            add(stream_t* ptr, char* str)
{
  int           size_str;

  size_str = strlen(str);

  for(int i = 0; i < size_str; i++)
    ptr->str[ptr->size + i] = str[i];

  ptr->size += size_str;
}

void        append(stream_t *ptr, char* str)
{
  int           size;

  if(ptr->str == NULL)
    *ptr = create(str);
  else
  {
    size = strlen(str);
    if(ptr->size + size >= ptr->limit)
    {
      ptr->str = (char*) realloc (ptr->str, ptr->limit + 4*BUF_SIZE);
      ptr->limit += 4*BUF_SIZE;
    }
    add(ptr, str);
  }
}

void            destroy(stream_t s)
{
  free(s.str);
}