From 6d22ae06cbdf21fabe197a4adb842ed65fd7f150 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?S=C3=A9bastien=20Villemot?= <sebastien@dynare.org>
Date: Tue, 12 Aug 2014 19:30:09 +0200
Subject: [PATCH] Fix substring operator in macro-processor.

The characters of the substring could be mixed with random characters from the
memory space. Thanks to Tom Holden for reporting the bug.

Closes #708
---
 macro/MacroValue.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/macro/MacroValue.cc b/macro/MacroValue.cc
index 65b3fc39..3dfab323 100644
--- a/macro/MacroValue.cc
+++ b/macro/MacroValue.cc
@@ -387,7 +387,7 @@ StringMV::operator[](const MacroValue &mv) const throw (TypeError, OutOfBoundsEr
       if (*it < 1 || *it > (int) value.length())
         throw OutOfBoundsError();
       char c = value.at(*it - 1);
-      result.append(&c);
+      result.append(1, c);
     }
   return new StringMV(driver, result);
 }