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+/*
+ * Copyright 2009, Lloyd Hilaiel.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * 3. Neither the name of Lloyd Hilaiel nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * 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;
+ unsigned int size;
+ unsigned int 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