/*
 * Copyright (c) 2009 Petri Lehtinen <petri@digip.org>
 *
 * Jansson is free software; you can redistribute it and/or modify
 * it under the terms of the MIT license. See LICENSE for details.
 */

#include "../config.h"
#include "strbuffer.h"
#include "util.h"

#define STRBUFFER_MIN_SIZE  16
#define STRBUFFER_FACTOR    2

int
strbuffer_init (strbuffer_t * strbuff)
{
	strbuff->size = STRBUFFER_MIN_SIZE;
	strbuff->length = 0;

	strbuff->value = g_malloc (strbuff->size);
	if (!strbuff->value)
		return -1;

	/* initialize to empty */
	strbuff->value[0] = '\0';
	return 0;
}

void
strbuffer_close (strbuffer_t * strbuff)
{
	g_free (strbuff->value);
	strbuff->size = 0;
	strbuff->length = 0;
	strbuff->value = NULL;
}

void
strbuffer_clear (strbuffer_t * strbuff)
{
	strbuff->length = 0;
	strbuff->value[0] = '\0';
}

const char                     *
strbuffer_value (const strbuffer_t * strbuff)
{
	return strbuff->value;
}

char                           *
strbuffer_steal_value (strbuffer_t * strbuff)
{
	char                           *result = strbuff->value;
	strbuffer_init (strbuff);
	return result;
}

int
strbuffer_append (strbuffer_t * strbuff, const char *string)
{
	return strbuffer_append_bytes (strbuff, string, strlen (string));
}

int
strbuffer_append_byte (strbuffer_t * strbuff, char byte)
{
	return strbuffer_append_bytes (strbuff, &byte, 1);
}

int
strbuffer_append_bytes (strbuffer_t * strbuff, const char *data, int size)
{
	if (strbuff->length + size >= strbuff->size) {
		strbuff->size = max (strbuff->size * STRBUFFER_FACTOR, strbuff->length + size + 1);

		strbuff->value = realloc (strbuff->value, strbuff->size);
		if (!strbuff->value)
			return -1;
	}

	memcpy (strbuff->value + strbuff->length, data, size);
	strbuff->length += size;
	strbuff->value[strbuff->length] = '\0';

	return 0;
}

char
strbuffer_pop (strbuffer_t * strbuff)
{
	if (strbuff->length > 0) {
		char                            c = strbuff->value[--strbuff->length];
		strbuff->value[strbuff->length] = '\0';
		return c;
	}
	else
		return '\0';
}