CommandLineArguments: use std::string in GenerateHelp()

CommandLineArguments.cxx

@@ -529,10 +529,7 @@ void CommandLineArguments::GenerateHelp()
     }
   }
 
-  // Create format for that string
-  char format[80];
-  sprintf(format, "  %%-%us  ", static_cast<unsigned int>(maxlen));
-
+  CommandLineArguments::Internal::String::size_type maxstrlen = maxlen;
   maxlen += 4; // For the space before and after the option
 
   // Print help for each option
@@ -540,27 +537,24 @@ void CommandLineArguments::GenerateHelp()
     CommandLineArguments::Internal::SetOfStrings::iterator sit;
     for (sit = mpit->second.begin(); sit != mpit->second.end(); sit++) {
       str << std::endl;
-      char argument[100];
-      sprintf(argument, "%s", sit->c_str());
+      std::string argument = *sit;
       switch (this->Internals->Callbacks[*sit].ArgumentType) {
         case CommandLineArguments::NO_ARGUMENT:
           break;
         case CommandLineArguments::CONCAT_ARGUMENT:
-          strcat(argument, "opt");
+          argument += "opt";
           break;
         case CommandLineArguments::SPACE_ARGUMENT:
-          strcat(argument, " opt");
+          argument += " opt";
           break;
         case CommandLineArguments::EQUAL_ARGUMENT:
-          strcat(argument, "=opt");
+          argument += "=opt";
           break;
         case CommandLineArguments::MULTI_ARGUMENT:
-          strcat(argument, " opt opt ...");
+          argument += " opt opt ...";
           break;
       }
-      char buffer[80];
-      sprintf(buffer, format, argument);
-      str << buffer;
+      str << "  " << argument.substr(0, maxstrlen) << "  ";
     }
     const char* ptr = this->Internals->Callbacks[mpit->first].Help;
     size_t len = strlen(ptr);