attgetopt.c

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/* ==================================================================== 
 * The Kannel Software License, Version 1.0 
 * 
 * Copyright (c) 2001-2018 Kannel Group  
 * Copyright (c) 1998-2001 WapIT Ltd.   
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 *    if any, must include the following acknowledgment: 
 *       "This product includes software developed by the 
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 * 
 * Portions of this software are based upon software originally written at  
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 */ 

/*
 * attgetopt.c - AT&T's public domain implementation of getopt.
 *
 * From the mod.sources newsgroup, volume 3, issue 58, with modifications
 * to bring it up to 21st century C.
 */

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

#include "gw-config.h"

/*
 * If the systm has getopt() defined within stdio.h (like on Solaris 2.6)
 * then we will not implement our own here.
 */
#ifndef HAVE_GETOPT_IN_STDIO_H

#define ERR(s, c)       \
    if (opterr) \
            (void) fprintf(stderr, "%s: %s\n", argv[0], s)

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 /* HAVE_GETOPT_IN_STDIO_H */