/*
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* Copyright 2009, Lloyd Hilaiel.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. Neither the name of Lloyd Hilaiel nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* A header only implementation of a simple stack of bytes, used in YAJL
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* to maintain parse state.
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*/
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#ifndef __YAJL_BYTESTACK_H__
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#define __YAJL_BYTESTACK_H__
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#include "api/yajl_common.h"
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#define YAJL_BS_INC 128
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typedef struct yajl_bytestack_t
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{
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unsigned char * stack;
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unsigned int size;
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unsigned int used;
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yajl_alloc_funcs * yaf;
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} yajl_bytestack;
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/* initialize a bytestack */
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#define yajl_bs_init(obs, _yaf) { \
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(obs).stack = NULL; \
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(obs).size = 0; \
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(obs).used = 0; \
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(obs).yaf = (_yaf); \
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} \
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/* initialize a bytestack */
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#define yajl_bs_free(obs) \
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if ((obs).stack) (obs).yaf->free((obs).yaf->ctx, (obs).stack);
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#define yajl_bs_current(obs) \
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(assert((obs).used > 0), (obs).stack[(obs).used - 1])
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#define yajl_bs_push(obs, byte) { \
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if (((obs).size - (obs).used) == 0) { \
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(obs).size += YAJL_BS_INC; \
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(obs).stack = (obs).yaf->realloc((obs).yaf->ctx,\
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(void *) (obs).stack, (obs).size);\
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} \
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(obs).stack[((obs).used)++] = (byte); \
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}
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/* removes the top item of the stack, returns nothing */
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#define yajl_bs_pop(obs) { ((obs).used)--; }
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#define yajl_bs_set(obs, byte) \
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(obs).stack[((obs).used) - 1] = (byte);
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#endif
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