Warn when we hit pcre.backtracking_limit

1 files changed, 10 insertions, 0 deletions

diff --git a/it.class b/it.class
index 9d43983..440d889 100644
--- a/it.class
+++ b/it.class
@@ -352,7 +352,17 @@ function match($pattern, $string, $p = array())
 	setlocale(LC_CTYPE, $oldlocale);
 
 	if (!$r)	# no match
+	{
+		static $backtrackerror;
+
+		if (!isset($backtrackerror))
+			$backtrackerror = defined('PREG_BACKTRACK_LIMIT_ERROR') ? constant('PREG_BACKTRACK_LIMIT_ERROR') : 0;
+
+		if ($backtrackerror && preg_last_error() == $backtrackerror)	# Silence phpversionlint.php commit hook: function_exists('preg_last_error')
+			it::error("Exceeded pcre.backtrack_limit of " . ini_get('pcre.backtrack_limit') . " bytes");
+
 		$result = $p['all'] ? array() : null;
+	}
 	else if (count($m) == 1)	# no capture
 		$result = $m[0];
 	else if (count($m) == 2)	# one capture