mirror of https://github.com/tstack/lnav.git
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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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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size_t size;
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size_t 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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