#include <stdlib.h>
#include <string.h>
#include "buffer.h"

void
buffer_init (struct buffer *b, int size)
{
  b->size = size;
  b->data = malloc (size);
  b->data[0] = '\0';
  b->index = 0;
}

void
buffer_add (struct buffer *b, const char *data, size_t len)
{
  if (len > 0)
    {
      while ((b->index + len) >= b->size)
	{
	  b->size <<= 1;
	  b->data = realloc (b->data, b->size);
	}
      if (len == 1)
	b->data[b->index] = *data;
      else
	memcpy (b->data + b->index, data, len);
      b->index += len;
      b->data[b->index] = '\0';
    }
}

void
buffer_addch (struct buffer *b, char c)
{
  buffer_add (b, &c, 1);
}

void
buffer_addstr (struct buffer *b, const char *s)
{
  buffer_add (b, s, strlen (s));
}

void
buffer_reset (struct buffer *b)
{
  b->index = 0;
  b->data[0] = '\0';
}