[fpc-pascal] Using flag field in Getopts
henry.vermaak at gmail.com
Tue Oct 30 11:52:31 CET 2012
On 30/10/12 10:05, luciano de souza wrote:
> Hello listers,
> Getopts offers very good features to process commandline arguments. As
> far as I could understand, I used it successfully. But it remains one
> unknown aspect for me. What is the field "flag"" of TOption record?
> How to use it?
> TOption = Record
> Name : String;
> Has_arg : Integer;
> Flag : PChar;
> Value : Char;
I think the man page for getopt explains best how this is supposed to work:
flag specifies how results are returned for a long option. If flag is
NULL, then getopt_long() returns val. (For example, the calling program
may set val to the equivalent short option character.) Otherwise,
getopt_long() returns 0, and flag points to a variable which is set to
val if the option is found, but left unchanged if the option is not found.
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