<INTERFACE> The <CD/CONTROL_UTIL/ signature <PP> <OPAQUE> <SPEC> <SUBSTRUCT>Cvt <SIGBODY> <SPEC> <VAL>int<TY>int Controls.value_cvt <VAL>bool<TY>bool Controls.value_cvt <VAL>real<TY>real Controls.value_cvt <COMMENT> <PP> Control converters for primitive types, using respective <CD>fromString</CD>/<CD>toString</CD> functions. </COMMENT> <SPEC> <VAL>stringList<TY>string list Controls.value_cvt <COMMENT> <PROTOTY> stringList </PROTOTY> <PP> Control converter for comma-separated tokens </COMMENT> <SPEC> <VAL>string<TY>string Controls.value_cvt <COMMENT> <PROTOTY> string </PROTOTY> <PP> </COMMENT> </SUBSTRUCT> <SPEC> <SUBSTRUCT>EnvName <SIGBODY> <SPEC> <VAL>toUpper<TY>string -> string -> string <COMMENT> <PROTOTY> toUpper <ARG>prefix</ARG> <ARG>s</ARG> </PROTOTY> <PP> converts the string <ARG>s</ARG> an format suitable for an environment-variable name. Lower-case letters are converted to upper case; the <CD>#"-"</CD> character is converted to <CD>#"_"</CD>; and the prefix <ARG>prefix</ARG> is added. </COMMENT> </SUBSTRUCT> </INTERFACE>