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 70