#include    <stdio.h>
#define EPR                 fprintf(stderr,
#define ERR(str, chr)       if(opterr){EPR "%s%c\n", str, chr);}
int     opterr = 1;
int     optind = 1;
int optopt;
char    *optarg;
char    *strchr();

int
getopt (int argc, char *const argv[], const char *opts)
{
    static int sp = 1;
    int c;
    char *cp;

    if (sp == 1)
        if (optind >= argc ||
           argv[optind][0] != '-' || argv[optind][1] == '\0')
            return -1;
        else if (strcmp(argv[optind], "--") == 0) {
            optind++;
            return -1;
        }
    optopt = c = argv[optind][sp];
    if (c == ':' || (cp=strchr(opts, c)) == 0) {
        ERR (": illegal option -- ", c);
        if (argv[optind][++sp] == '\0') {
            optind++;
            sp = 1;
        }
        return '?';
    }
    if (*++cp == ':') {
        if (argv[optind][sp+1] != '\0')
            optarg = &argv[optind++][sp+1];
        else if (++optind >= argc) {
            ERR (": option requires an argument -- ", c);
            sp = 1;
            return '?';
        } else
            optarg = argv[optind++];
        sp = 1;
    } else {
        if (argv[optind][++sp] == '\0') {
            sp = 1;
            optind++;
        }
        optarg = 0;
    }
    return c;
}