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/*
* Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* A header only implementation of a simple stack of bytes, used in YAJL
* to maintain parse state.
*/
#ifndef __YAJL_BYTESTACK_H__
#define __YAJL_BYTESTACK_H__
#include "yajl_common.h"
#define YAJL_BS_INC 128
typedef struct yajl_bytestack_t
{
unsigned char * stack;
size_t size;
size_t used;
yajl_alloc_funcs * yaf;
} yajl_bytestack;
/* initialize a bytestack */
#define yajl_bs_init(obs, _yaf) { \
(obs).stack = NULL; \
(obs).size = 0; \
(obs).used = 0; \
(obs).yaf = (_yaf); \
} \
/* initialize a bytestack */
#define yajl_bs_free(obs) \
if ((obs).stack) (obs).yaf->free((obs).yaf->ctx, (obs).stack);
#define yajl_bs_current(obs) \
(assert((obs).used > 0), (obs).stack[(obs).used - 1])
#define yajl_bs_push(obs, byte) { \
if (((obs).size - (obs).used) == 0) { \
(obs).size += YAJL_BS_INC; \
(obs).stack = (obs).yaf->realloc((obs).yaf->ctx,\
(void *) (obs).stack, (obs).size);\
} \
(obs).stack[((obs).used)++] = (byte); \
}
/* removes the top item of the stack, returns nothing */
#define yajl_bs_pop(obs) { ((obs).used)--; }
#define yajl_bs_set(obs, byte) \
(obs).stack[((obs).used) - 1] = (byte);
#endif
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