/*
cmd -ao arg path path
cmd -a -o arg path path
cmd -o arg -a path path
cmd -a -o arg -- path path
cmd -a -oarg path path
cmd -aoarg path path

*/

#include <stdio.h>
#include <unistd.h>

int main(int argc, char *argv[ ])
{
    int c;
    int i, bflg, aflg, errflg;
    char *ifile;
    char *ofile;
    extern char *optarg;
    extern int optind, optopt;

    while ((c = getopt(argc, argv, ":abf:o:")) != -1) {
        switch(c) {
        case 'a':
            fprintf(stdout, "%c \n", c);
            if (bflg) errflg++;
            else aflg++;
            break;
        case 'b':
            fprintf(stdout, "%c \n", c);
            if (aflg) errflg++;
            else {
                bflg++;
//                bproc();
            }
            break;
        case 'f':
            fprintf(stdout, "%c,%s \n", c, optarg);
            ifile = optarg;
            break;
        case 'o':
            fprintf(stdout, "%c,%s \n", c, optarg);
            ofile = optarg;
            break;
        case ':':       /* -f or -o without operand */
            fprintf(stderr, "Option -%c requires an operand\n", optopt);
            fprintf(stdout, "Option -%c requires an operand\n", optopt);
            errflg++;
            break;
        case '?':
            fprintf(stderr, "Unrecognized option: -%c\n", optopt);
            fprintf(stdout, "Unrecognized option: -%c\n", optopt);
            errflg++;
        }
    }
    if (errflg) {
        fprintf(stderr, "usage: . . . ");
        fprintf(stdout, "usage: . . .errflg = %d\n ", errflg);
        exit(1);
    }
    fprintf(stdout, "optind = %d\n ", optind);
    for(i=0; i<optind; i++)
       fprintf(stdout, "argv[%d] = %s\n ", i, argv[i]);
//    for ( ; optind < argc; optind++) {
//        if (access(argv[optind], R_OK)) {

}