86 lines
3.1 KiB
C
86 lines
3.1 KiB
C
/*
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* Copyright 2009, R. Tyler Ballance <tyler@monkeypox.org>
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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 R. Tyler Ballance 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, highly efficient custom pointer stack implementation,
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* used in py-yajl to maintain parse state.
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*/
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#ifndef __PY_YAJL_BYTESTACK_H__
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#define __PY_YAJL_BYTESTACK_H__
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#include <Python.h>
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#include "assert.h"
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#define PY_YAJL_PS_INC 128
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typedef struct py_yajl_bytestack_t
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{
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PyObject ** stack;
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unsigned int size;
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unsigned int used;
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} py_yajl_bytestack;
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/* initialize a bytestack */
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#define py_yajl_ps_init(ops) { \
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(ops).stack = NULL; \
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(ops).size = 0; \
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(ops).used = 0; \
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} \
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/* initialize a bytestack */
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#define py_yajl_ps_free(ops) \
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if ((ops).stack) free((ops).stack);
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#define py_yajl_ps_current(ops) \
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(assert((ops).used > 0), (ops).stack[(ops).used - 1])
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#define py_yajl_ps_length(ops) ((ops).used)
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#define py_yajl_ps_push(ops, pointer) { \
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if (((ops).size - (ops).used) == 0) { \
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(ops).size += PY_YAJL_PS_INC; \
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(ops).stack = realloc((void *) (ops).stack, sizeof(PyObject *) * (ops).size); \
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} \
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(ops).stack[((ops).used)++] = (pointer); \
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}
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/* removes the top item of the stack, returns nothing */
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#define py_yajl_ps_pop(ops) { ((ops).used)--; }
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#define py_yajl_ps_set(ops, pointer) \
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(ops).stack[((ops).used) - 1] = (pointer);
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#endif
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