improve handling of missing helpers messages

src/utils/smallut.cpp

@@ -1,5 +1,5 @@
 #ifndef lint
-static char rcsid[] = "@(#$Id: smallut.cpp,v 1.25 2006-12-19 12:11:21 dockes Exp $ (C) 2004 J.F.Dockes";
+static char rcsid[] = "@(#$Id: smallut.cpp,v 1.26 2007-02-08 17:05:12 dockes Exp $ (C) 2004 J.F.Dockes";
 #endif
 /*
  *   This program is free software; you can redistribute it and/or modify
@@ -258,6 +258,31 @@ bool stringToStrings(const string &s, std::list<string> &tokens)
     return true;
 }
 
+void stringsToString(const list<string> &tokens, string &s) 
+{
+    for (list<string>::const_iterator it = tokens.begin();
+	 it != tokens.end(); it++) {
+	bool hasblanks = false;
+	if (it->find_first_of(" \t\n") != string::npos)
+	    hasblanks = true;
+	if (it != tokens.begin())
+	    s.append(1, ' ');
+	if (hasblanks)
+	    s.append(1, '"');
+	for (unsigned int i = 0; i < it->length(); i++) {
+	    char car = it->at(i);
+	    if (car == '"') {
+		s.append(1, '\\');
+		s.append(1, car);
+	    } else {
+		s.append(1, car);
+	    }
+	}
+	if (hasblanks)
+	    s.append(1, '"');
+    }
+}
+
 void stringToTokens(const string& str, list<string>& tokens,
 		    const string& delims, bool skipinit)
 {

src/utils/smallut.h

@@ -16,7 +16,7 @@
  */
 #ifndef _SMALLUT_H_INCLUDED_
 #define _SMALLUT_H_INCLUDED_
-/* @(#$Id: smallut.h,v 1.25 2006-12-19 12:11:21 dockes Exp $  (C) 2004 J.F.Dockes */
+/* @(#$Id: smallut.h,v 1.26 2007-02-08 17:05:12 dockes Exp $  (C) 2004 J.F.Dockes */
 #include <string>
 #include <list>
 #include <map>
@@ -45,6 +45,10 @@ extern bool samecharset(const string &cs1, const string &cs2);
  * dquotes can be escaped with \ etc...
  */
 extern bool stringToStrings(const string &s, list<string> &tokens);
+/**
+ * Inverse operation:
+ */
+extern void stringsToString(const list<string> &tokens, string &s);
 
 /**
  * Split input string. No handling of quoting