[LyX/master] Limit the size of strings we read from RCS

[Jean-Marc Lasgouttes]

commit d6d412c49e47027a38698d906f6ad853c8674582
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Sat Mar 11 20:46:32 2017 +0100

    Limit the size of strings we read from RCS
    
    This calms down Coverity which fears than an evil RCS repository would 
break LyX.
---
 src/VCBackend.cpp |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/src/VCBackend.cpp b/src/VCBackend.cpp
index b395a0d..3eeb3d6 100644
--- a/src/VCBackend.cpp
+++ b/src/VCBackend.cpp
@@ -170,6 +170,8 @@ void RCS::scanMaster()
        LYXERR(Debug::LYXVC, "LyXVC::RCS: scanMaster: " << master_);
 
        ifstream ifs(master_.toFilesystemEncoding().c_str());
+       // limit the size of strings we read to avoid memory problems
+       ifs >> setw(65636);
 
        string token;
        bool read_enough = false;