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Date: Tue, 20 May 2003 15:34:10 -0400
To: PHP Internals List <internals@lists.php.net>
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Sender: David Brown <dave@lan.codewhore.org>
Subject: Re: [PHP-DEV] [PATCH] Add an optional size limit to debug_backtrace
From: dave@codewhore.org (David Brown)

On Tue, May 20, 2003 at 01:59:03PM -0400, David Brown wrote:
| Hi:
| <patch>

Or, so as to not turn this into the Integer Overflow and Crappy C
Competition (IOCCC <grin>), perhaps this instead:

--- Zend/zend_builtin_functions.c~	2003-05-20 11:33:36.000000000 -0400
+++ Zend/zend_builtin_functions.c	2003-05-20 15:31:09.000000000 -0400
@@ -1173,7 +1173,7 @@
 	return arg_array;
 }
 
-/* {{{ proto void debug_backtrace(void)
+/* {{{ proto void debug_backtrace([int limit])
    Prints out a backtrace */
 ZEND_FUNCTION(debug_backtrace)
 {
@@ -1189,11 +1189,21 @@
 	void **args = cur_arg_pos;
 	int arg_stack_consistent = 0;
 	int frames_on_stack = 0;
+	zval **limit_zval = NULL;
+	long limit;
 
-	if (ZEND_NUM_ARGS()) {
+	if (ZEND_NUM_ARGS() > 1) {
 		ZEND_WRONG_PARAM_COUNT();
 	}
 
+	if (ZEND_NUM_ARGS() == 1 && zend_get_parameters_ex(1, &limit_zval) == SUCCESS) {
+		convert_to_long_ex(limit_zval);
+		if ((limit = (*limit_zval)->value.lval) <= 0) {
+			zend_error(E_WARNING, "Limit must be a non-zero positive integer");
+			return;
+		}
+	}
+
 	while (--args >= EG(argument_stack).elements) {
 		if (*args--) {
 			break;
@@ -1217,6 +1227,9 @@
 	array_init(return_value);
 
 	while (ptr) {
+		if (limit_zval && --limit < 0)
+			break;
+
 		MAKE_STD_ZVAL(stack_frame);
 		array_init(stack_frame);


Thanks,

- Dave
  dave@codewhore.org