[LyX/master] Experiment: limit size of strings read from lib/symbols

[Jean-Marc Lasgouttes]

commit 9a013637bbe7c35dc90cb28ff874da99133a1f8b
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Fri Mar 10 16:29:09 2017 +0100

    Experiment: limit size of strings read from lib/symbols
    
    Coverity complains that we might read strings that are arbitrary
    large, and that this can be a security issue. This is a problem in
    particular, when we feed these strings to from_utf8(), which coverity
    flags as dangerous for some reason.
    
    The best solution would be IMO to model from_utf8() properly, but I do
    not know how to do that. Here I try a different solution, where I
    cannot read a string larger than 64k from the file.
    
    Let's see whether this removes part of coverity warnings.
---
 src/mathed/MathFactory.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/mathed/MathFactory.cpp b/src/mathed/MathFactory.cpp
index 3198f80..2cd045b 100644
--- a/src/mathed/MathFactory.cpp
+++ b/src/mathed/MathFactory.cpp
@@ -74,6 +74,7 @@
 #include "LyX.h" // use_gui
 #include "OutputParams.h"
 
+#include <iomanip>
 
 using namespace std;
 using namespace lyx::support;
@@ -188,7 +189,7 @@ void initSymbols()
                        string extra;
                        string xmlname;
                        bool hidden = false;
-                       is >> macro >> requires;
+                       is >> setw(65536) >> macro >> requires;
                        if ((is >> xmlname)) {
                                extra = requires;
                                if (!(is >> requires))