getopt.c

/*
 * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
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 * Copyright (c) 1999-2008 Apple Inc.  All Rights Reserved.
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 * Version 2.0 (the 'License'). You may not use this file except in
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/* ====================================================================
 * The Apache Software License, Version 1.1
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 */

#ifdef _WIN32

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

#define OPTERRCOLON (1)
#define OPTERRNF (2)
#define OPTERRARG (3)

char *optarg;
int optreset = 0;
int optind = 1;
int opterr = 1;
int optopt;

static int
optiserr(int argc, char * const *argv, int oint, const char *optstr,
         int optchr, int err)
{
    if(opterr)
    {
        fprintf(stderr, "Error in argument %d, char %d: ", oint, optchr+1);
        switch(err)
        {
        case OPTERRCOLON:
            fprintf(stderr, ": in flags\n");
            break;
        case OPTERRNF:
            fprintf(stderr, "option not found %c\n", argv[oint][optchr]);
            break;
        case OPTERRARG:
            fprintf(stderr, "no argument for option %c\n", argv[oint][optchr]);
            break;
        default:
            fprintf(stderr, "unknown\n");
            break;
        }
    }
    optopt = argv[oint][optchr];
    return('?');
}
    
   

int
getopt(int argc, char* const *argv, const char *optstr)
{
    static int optchr = 0;
    static int dash = 0; /* have already seen the - */

    char *cp;

    if (optreset)
        optreset = optchr = dash = 0;
    if(optind >= argc)
        return(EOF);
    if(!dash && (argv[optind][0] !=  '-'))
        return(EOF);
    if(!dash && (argv[optind][0] ==  '-') && !argv[optind][1])
    {
        /*
         * use to specify stdin. Need to let pgm process this and
         * the following args
         */
        return(EOF);
    }
    if((argv[optind][0] == '-') && (argv[optind][1] == '-'))
    {
        /* -- indicates end of args */
        optind++;
        return(EOF);
    }
    if(!dash)
    {
        assert((argv[optind][0] == '-') && argv[optind][1]);
        dash = 1;
        optchr = 1;
    }

    /* Check if the guy tries to do a -: kind of flag */
    assert(dash);
    if(argv[optind][optchr] == ':')
    {
        dash = 0;
        optind++;
        return(optiserr(argc, argv, optind-1, optstr, optchr, OPTERRCOLON));
    }
    if(!(cp = strchr(optstr, argv[optind][optchr])))
    {
        int errind = optind;
        int errchr = optchr;

        if(!argv[optind][optchr+1])
        {
            dash = 0;
            optind++;
        }
        else
            optchr++;
        return(optiserr(argc, argv, errind, optstr, errchr, OPTERRNF));
    }
    if(cp[1] == ':')
    {
        dash = 0;
        optind++;
        if(optind == argc)
            return(optiserr(argc, argv, optind-1, optstr, optchr, OPTERRARG));
        optarg = argv[optind++];
        return(*cp);
    }
    else
    {
        if(!argv[optind][optchr+1])
        {
            dash = 0;
            optind++;
        }
        else
            optchr++;
        return(*cp);
    }
    assert(0);
    return(0);
}
#endif /* WIN32 */