getopt.c

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/*
POSIX getopt for Windows

AT&T Public License

Code given out at the 1985 UNIFORUM conference in Dallas.

Significant updates
    2014-12-02: Updated to use CRL_HAVE_GETOPT preprocessor definition and work with modern dialects of C and C++
*/

#include "getopt.h"

#ifndef CRL_HAVE_GETOPT

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

#define ERR(s, c)                \
    if (opterr) {                \
        char errbuf[2];          \
        errbuf[0] = c;           \
        errbuf[1] = '\n';        \
        fputs (argv[0], stderr); \
        fputs (s, stderr);       \
        fputc(c, stderr);        \
    }                            \

int opterr = 1;
int optind = 1;
int optopt;
char* optarg;

int getopt(int argc, char** argv, 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 EOF;
        }
        else if (strcmp (argv[optind], "--") == 0)
        {
            optind++;
            return EOF;
        }
    }
    optopt = c = argv[optind][sp];
    if (c == ':' || (cp = strchr(opts, c)) == NULL)
    {
        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 = NULL;
    }
    return c;
}

#endif