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Member "yajl-2.1.0/src/yajl_bytestack.h" (19 Mar 2014, 2379 Bytes) of package /linux/www/yajl-2.1.0.tar.gz:


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    1 /*
    2  * Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
    3  *
    4  * Permission to use, copy, modify, and/or distribute this software for any
    5  * purpose with or without fee is hereby granted, provided that the above
    6  * copyright notice and this permission notice appear in all copies.
    7  *
    8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
    9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   15  */
   16 
   17 /*
   18  * A header only implementation of a simple stack of bytes, used in YAJL
   19  * to maintain parse state.
   20  */
   21 
   22 #ifndef __YAJL_BYTESTACK_H__
   23 #define __YAJL_BYTESTACK_H__
   24 
   25 #include "api/yajl_common.h"
   26 
   27 #define YAJL_BS_INC 128
   28 
   29 typedef struct yajl_bytestack_t
   30 {
   31     unsigned char * stack;
   32     size_t size;
   33     size_t used;
   34     yajl_alloc_funcs * yaf;
   35 } yajl_bytestack;
   36 
   37 /* initialize a bytestack */
   38 #define yajl_bs_init(obs, _yaf) {               \
   39         (obs).stack = NULL;                     \
   40         (obs).size = 0;                         \
   41         (obs).used = 0;                         \
   42         (obs).yaf = (_yaf);                     \
   43     }                                           \
   44 
   45 
   46 /* initialize a bytestack */
   47 #define yajl_bs_free(obs)                 \
   48     if ((obs).stack) (obs).yaf->free((obs).yaf->ctx, (obs).stack);
   49 
   50 #define yajl_bs_current(obs)               \
   51     (assert((obs).used > 0), (obs).stack[(obs).used - 1])
   52 
   53 #define yajl_bs_push(obs, byte) {                       \
   54     if (((obs).size - (obs).used) == 0) {               \
   55         (obs).size += YAJL_BS_INC;                      \
   56         (obs).stack = (obs).yaf->realloc((obs).yaf->ctx,\
   57                                          (void *) (obs).stack, (obs).size);\
   58     }                                                   \
   59     (obs).stack[((obs).used)++] = (byte);               \
   60 }
   61 
   62 /* removes the top item of the stack, returns nothing */
   63 #define yajl_bs_pop(obs) { ((obs).used)--; }
   64 
   65 #define yajl_bs_set(obs, byte)                          \
   66     (obs).stack[((obs).used) - 1] = (byte);
   67 
   68 
   69 #endif