7.4.28.3 optionProcess

this is the main option processing routine

Usage:

int res = optionProcess( pOpts, argc, argv );

Where the arguments are:

	Name	Type	Description
	-----	-----	-------------
	pOpts	tOptions*	program options descriptor
	argc	int	program arg count
	argv	char**	program arg vector
	returns	int	the count of the arguments processed

This is the main entry point for processing options. It is intended that this procedure be called once at the beginning of the execution of a program. Depending on options selected earlier, it is sometimes necessary to stop and restart option processing, or to select completely different sets of options. This can be done easily, but you generally do not want to do this.

The number of arguments processed always includes the program name. If one of the arguments is "--", then it is counted and the processing stops. If an error was encountered and errors are to be tolerated, then the returned value is the index of the argument causing the error.

Errors will cause diagnostics to be printed. exit(3) may or may not be called. It depends upon whether or not the options were generated with the "allow-errors" attribute, or if the ERRSKIP_OPTERR or ERRSTOP_OPTERR macros were invoked.