From 20ef3e3c5b7cae918e35fc9c0b906848ce01564b Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Sun, 12 May 2013 22:59:28 +0200
Subject: [PATCH] Clarify usage of addcslashes

---
 src/Composer/Json/JsonManipulator.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/Composer/Json/JsonManipulator.php b/src/Composer/Json/JsonManipulator.php
index 9dde207ff..331ac680d 100644
--- a/src/Composer/Json/JsonManipulator.php
+++ b/src/Composer/Json/JsonManipulator.php
@@ -72,6 +72,7 @@ class JsonManipulator
         if (isset($data[$type][$package])) {
             // update existing link
             $packageRegex = str_replace('/', '\\\\?/', preg_quote($package));
+            // addcslashes is used to double up backslashes since preg_replace resolves them as back references otherwise, see #1588
             $links = preg_replace('{"'.$packageRegex.'"(\s*:\s*)'.self::$JSON_STRING.'}i', addcslashes(JsonFile::encode($package).'${1}"'.$constraint.'"', '\\'), $links);
         } else {
             if (preg_match('#^\s*\{\s*\S+.*?(\s*\}\s*)$#', $links, $match)) {