/* parc
 * Copyright (C) 2025 Ekaitz Zarraga <ekaitz@elenq.tech>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include <assert.h>
#include <stdlib.h>
#include "text-buffer.h"

void
text_buffer_init (text_buffer *tb)
{
  tb->used = 0;
  tb->size = 0;
  tb->contents = NULL;
}

void
text_buffer_resize (text_buffer *tb, size_t size)
{
  tb->size = size;
  tb->contents = realloc (tb->contents, sizeof (*tb->contents) * size);
}

void
text_buffer_append (text_buffer *tb, char c)
{
  size_t base_size = 1024;
  if (tb->size == 0)
    {
      tb->contents = malloc (sizeof (*tb->contents) * base_size);
      tb->size = base_size;
    }
  else if (tb->size == tb->used)
    text_buffer_resize (tb, tb->size * 2);
  tb->contents[tb->used++] = c;
}

char
text_buffer_index (text_buffer *tb, size_t pos)
{
  assert (pos < tb->used);
  return tb->contents[pos];
}

void
text_buffer_clear (text_buffer *tb)
{
  free (tb->contents);
  text_buffer_init (tb);
}

void
text_buffer_fill (text_buffer *tb, char *fill, size_t size)
{
  size_t i;
  tb->used = size;
  tb->size = size;
  free (tb->contents);
  tb->contents = malloc (sizeof (*tb->contents) * size);
  for (i=0; i<size; i++)
    {
      tb->contents[i] = fill[i];
    }
}