soltools/cpp/_getopt.c


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#include    <stdio.h>
#include    <string.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;

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