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To:	"=?gb18030?B?Y3lnd2luQGN5Z3dpbi5jb20=?=" <cygwin AT cygwin DOT com>
Subject:	When displaying Chinese help information,
	the program does not respond. The code enters a dead loop.
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Date:	Thu, 28 Mar 2024 23:26:20 +0800
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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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