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    1: /*
    2:    +----------------------------------------------------------------------+
    3:    | Zend Engine                                                          |
    4:    +----------------------------------------------------------------------+
    5:    | Copyright (c) 1998-2012 Zend Technologies Ltd. (http://www.zend.com) |
    6:    +----------------------------------------------------------------------+
    7:    | This source file is subject to version 2.00 of the Zend license,     |
    8:    | that is bundled with this package in the file LICENSE, and is        | 
    9:    | available through the world-wide-web at the following url:           |
   10:    | http://www.zend.com/license/2_00.txt.                                |
   11:    | If you did not receive a copy of the Zend license and are unable to  |
   12:    | obtain it through the world-wide-web, please send a note to          |
   13:    | license@zend.com so we can mail you a copy immediately.              |
   14:    +----------------------------------------------------------------------+
   15:    | Authors: Andi Gutmans <andi@zend.com>                                |
   16:    |          Zeev Suraski <zeev@zend.com>                                |
   17:    +----------------------------------------------------------------------+
   18: */
   19: 
   20: /* $Id: zend_stack.c,v 1.1.1.1 2012/02/21 23:47:52 misho Exp $ */
   21: 
   22: #include "zend.h"
   23: #include "zend_stack.h"
   24: 
   25: ZEND_API int zend_stack_init(zend_stack *stack)
   26: {
   27: 	stack->top = 0;
   28: 	stack->elements = (void **) emalloc(sizeof(void **) * STACK_BLOCK_SIZE);
   29: 	if (!stack->elements) {
   30: 		return FAILURE;
   31: 	} else {
   32: 		stack->max = STACK_BLOCK_SIZE;
   33: 		return SUCCESS;
   34: 	}
   35: }
   36: 
   37: ZEND_API int zend_stack_push(zend_stack *stack, const void *element, int size)
   38: {
   39: 	if (stack->top >= stack->max) {		/* we need to allocate more memory */
   40: 		stack->elements = (void **) erealloc(stack->elements,
   41: 				   (sizeof(void **) * (stack->max += STACK_BLOCK_SIZE)));
   42: 		if (!stack->elements) {
   43: 			return FAILURE;
   44: 		}
   45: 	}
   46: 	stack->elements[stack->top] = (void *) emalloc(size);
   47: 	memcpy(stack->elements[stack->top], element, size);
   48: 	return stack->top++;
   49: }
   50: 
   51: 
   52: ZEND_API int zend_stack_top(const zend_stack *stack, void **element)
   53: {
   54: 	if (stack->top > 0) {
   55: 		*element = stack->elements[stack->top - 1];
   56: 		return SUCCESS;
   57: 	} else {
   58: 		*element = NULL;
   59: 		return FAILURE;
   60: 	}
   61: }
   62: 
   63: 
   64: ZEND_API int zend_stack_del_top(zend_stack *stack)
   65: {
   66: 	if (stack->top > 0) {
   67: 		efree(stack->elements[--stack->top]);
   68: 	}
   69: 	return SUCCESS;
   70: }
   71: 
   72: 
   73: ZEND_API int zend_stack_int_top(const zend_stack *stack)
   74: {
   75: 	int *e;
   76: 
   77: 	if (zend_stack_top(stack, (void **) &e) == FAILURE) {
   78: 		return FAILURE;			/* this must be a negative number, since negative numbers can't be address numbers */
   79: 	} else {
   80: 		return *e;
   81: 	}
   82: }
   83: 
   84: 
   85: ZEND_API int zend_stack_is_empty(const zend_stack *stack)
   86: {
   87: 	if (stack->top == 0) {
   88: 		return 1;
   89: 	} else {
   90: 		return 0;
   91: 	}
   92: }
   93: 
   94: 
   95: ZEND_API int zend_stack_destroy(zend_stack *stack)
   96: {
   97: 	int i;
   98: 
   99: 	if (stack->elements) {
  100: 		for (i = 0; i < stack->top; i++) {
  101: 			efree(stack->elements[i]);
  102: 		}
  103: 
  104: 		efree(stack->elements);
  105: 	}
  106: 
  107: 	return SUCCESS;
  108: }
  109: 
  110: 
  111: ZEND_API void **zend_stack_base(const zend_stack *stack)
  112: {
  113: 	return stack->elements;
  114: }
  115: 
  116: 
  117: ZEND_API int zend_stack_count(const zend_stack *stack)
  118: {
  119: 	return stack->top;
  120: }
  121: 
  122: 
  123: ZEND_API void zend_stack_apply(zend_stack *stack, int type, int (*apply_function)(void *element))
  124: {
  125: 	int i;
  126: 
  127: 	switch (type) {
  128: 		case ZEND_STACK_APPLY_TOPDOWN:
  129: 			for (i=stack->top-1; i>=0; i--) {
  130: 				if (apply_function(stack->elements[i])) {
  131: 					break;
  132: 				}
  133: 			}
  134: 			break;
  135: 		case ZEND_STACK_APPLY_BOTTOMUP:
  136: 			for (i=0; i<stack->top; i++) {
  137: 				if (apply_function(stack->elements[i])) {
  138: 					break;
  139: 				}
  140: 			}
  141: 			break;
  142: 	}
  143: }
  144: 
  145: 
  146: ZEND_API void zend_stack_apply_with_argument(zend_stack *stack, int type, int (*apply_function)(void *element, void *arg), void *arg)
  147: {
  148: 	int i;
  149: 
  150: 	switch (type) {
  151: 		case ZEND_STACK_APPLY_TOPDOWN:
  152: 			for (i=stack->top-1; i>=0; i--) {
  153: 				if (apply_function(stack->elements[i], arg)) {
  154: 					break;
  155: 				}
  156: 			}
  157: 			break;
  158: 		case ZEND_STACK_APPLY_BOTTOMUP:
  159: 			for (i=0; i<stack->top; i++) {
  160: 				if (apply_function(stack->elements[i], arg)) {
  161: 					break;
  162: 				}
  163: 			}
  164: 			break;
  165: 	}
  166: }
  167: 
  168: /*
  169:  * Local variables:
  170:  * tab-width: 4
  171:  * c-basic-offset: 4
  172:  * indent-tabs-mode: t
  173:  * End:
  174:  */