Zend Library

1 files changed, 71 insertions, 0 deletions

diff --git a/Zend/zend_ptr_stack.c b/Zend/zend_ptr_stack.c
new file mode 100644
index 0000000000..3eeec0576c
--- /dev/null
+++ b/Zend/zend_ptr_stack.c
@@ -0,0 +1,71 @@
+/*
+   +----------------------------------------------------------------------+
+   | Zend Engine                                                          |
+   +----------------------------------------------------------------------+
+   | Copyright (c) 1998, 1999 Andi Gutmans, Zeev Suraski                  |
+   +----------------------------------------------------------------------+
+   | This source file is subject to the Zend license, that is bundled     |
+   | with this package in the file LICENSE.  If you did not receive a     |
+   | copy of the Zend license, please mail us at zend@zend.com so we can  |
+   | send you a copy immediately.                                         |
+   +----------------------------------------------------------------------+
+   | Authors: Andi Gutmans <andi@zend.com>                                |
+   |          Zeev Suraski <zeev@zend.com>                                |
+   +----------------------------------------------------------------------+
+*/
+
+#include "zend.h"
+#include "zend_ptr_stack.h"
+
+
+ZEND_API void zend_ptr_stack_init(zend_ptr_stack *stack)
+{
+	stack->top_element = stack->elements = (void **) emalloc(sizeof(void *)*STACK_BLOCK_SIZE);
+	stack->max = STACK_BLOCK_SIZE;
+	stack->top = 0;
+}
+
+
+ZEND_API inline void zend_ptr_stack_push(zend_ptr_stack *stack, void *ptr)
+{
+	if (stack->top >= stack->max) {		/* we need to allocate more memory */
+		short diff = stack->top_element-stack->elements;
+		
+		stack->elements = (void **) erealloc(stack->elements, (sizeof(void *) * (stack->max *= 2 )));
+		stack->top_element = stack->elements+diff;
+	}
+	stack->top++;
+	*(stack->top_element++) = ptr;
+}
+
+
+ZEND_API inline void *zend_ptr_stack_pop(zend_ptr_stack *stack)
+{
+	stack->top--;
+	return *(--stack->top_element);
+}
+
+
+ZEND_API void zend_ptr_stack_destroy(zend_ptr_stack *stack)
+{
+	if (stack->elements) {
+		efree(stack->elements);
+	}
+}
+
+
+ZEND_API void zend_ptr_stack_apply(zend_ptr_stack *stack, void (*func)(void *))
+{
+	int i = stack->top;
+
+	while (--i >= 0) {
+		func(stack->elements[i]);
+	}
+}
+
+
+ZEND_API void zend_ptr_stack_clean(zend_ptr_stack *stack, void (*func)(void *))
+{
+	zend_ptr_stack_apply(stack, func);
+	stack->top = 0;
+}