Options.c

/* Utility function to extract option flags from the command line.  */

#include "Everything.h"
#include <stdarg.h>

DWORD Options (int argc, LPCTSTR argv [], LPCTSTR OptStr, ...)

/* argv is the command line.
    The options, if any, start with a '-' in argv[1], argv[2], ...
    OptStr is a text string containing all possible options,
    in one-to-one correspondence with the addresses of Boolean variables
    in the variable argument list (...).
    These flags are set if and only if the corresponding option
    character occurs in argv [1], argv [2], ...
    The return value is the argv index of the first argument beyond the options. */

{
    va_list pFlagList;
    LPBOOL pFlag;
    int iFlag = 0, iArg;

    va_start (pFlagList, OptStr);

    while ((pFlag = va_arg (pFlagList, LPBOOL)) != NULL
                && iFlag < (int)_tcslen (OptStr)) {
        *pFlag = FALSE;
        for (iArg = 1; !(*pFlag) && iArg < argc && argv [iArg] [0] == _T('-'); iArg++)
            *pFlag = _memtchr (argv [iArg], OptStr [iFlag],
                    _tcslen (argv [iArg])) != NULL;
        iFlag++;
    }

    va_end (pFlagList);

    for (iArg = 1; iArg < argc && argv [iArg] [0] == _T('-'); iArg++);

    return iArg;
}