When displaying Chinese help information, the program does not respond. The code enters a dead loop.

[赵伟 via Cygwin]

When displaying Chinese help information, the program does not respond. 
The code enters a dead loop in file 
"libgetopt++/include/getopt++/DefaultFormatter.h"??Because some Chinese help 
information does not contain spaces.
diff --git a/libgetopt++/include/getopt++/DefaultFormatter.h 
b/libgetopt++/include/getopt++/DefaultFormatter.h
index ee2397f5..19ac67e1 100644
--- a/libgetopt++/include/getopt++/DefaultFormatter.h
+++ b/libgetopt++/include/getopt++/DefaultFormatter.h
@@ -64,6 +64,7 @@ class DefaultFormatter {
        {
          // TODO: consider using a 
line breaking strategy here.
          int pos = 
helpmsg.substr(0,h_len).find_last_of(" ");
+         if(pos<=0)break;
          theStream << 
helpmsg.substr(0,pos)
                 
   << std::endl << std::string (o_len, ' ');
          helpmsg.erase (0,pos+1);

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