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getopt.c

/*
Date: Tue, 25 Dec 84 19:20:50 EST
From: Keith Bostic <harvard!seismo!keith>
To: genrad!sources
Subject: public domain getopt(3)

There have recently been several requests for a public
domain version of getopt(3), recently.  Thought this
might be worth reposting.

                Keith Bostic
                        ARPA: keith@seismo 
                        UUCP: seismo!keith

======================================================================
In April of this year, Henry Spencer (utzoo!henry) released a public
domain version of getopt (USG, getopt(3)).  Well, I've been trying to
port some USG dependent software and it didn't seem to work.  The problem
ended up being that the USG version of getopt has some external variables
that aren't mentioned in the documentation.  Anyway, to fix these problems,
I rewrote the public version of getopt.  It has the following advantages:

        -- it includes those "unknown" variables
        -- it's smaller/faster 'cause it doesn't use the formatted
                output conversion routines in section 3 of the UNIX manual.
        -- the error messages are the same as S5's.
        -- it has the same side-effects that S5's has.
        -- the posted bug on how the error messages are flushed has been
                implemented.  (posting by Tony Hansen; pegasus!hansen)

I won't post the man pages since Henry already did; a special note,
it's not documented in the S5 manual that the options ':' and '?' are
illegal.  It should be obvious, but I thought I'd mention it...
This software was derived from binaries of S5 and the S5 man page, and is
(I think?) totally (I'm pretty sure?) compatible with S5 and backward
compatible to Henry's version.

                Keith Bostic
                        ARPA: keith@seismo 
                        UUCP: seismo!keith

*UNIX is a trademark of Bell Laboratories

Further modified by John Walker on 2001-02-19 to accept
GNU-style "--xxx" options.  The original code considered
any option beginning with "--" as the end of the options
list.  I changed the logic so that only "--" without a
suffix is treated as an end of option marker.

.. cut along the dotted line .........................................
*/

#include "config.h"

#include <stdio.h>

#ifdef HAVE_STRING_H
#include <string.h>
#else
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#endif

#ifndef HAVE_GETOPT

#include "getopt.h"

/*
 * get option letter from argument vector
 */
int     optind = 1,             /* index into parent argv vector */
        optopt;                 /* character checked for validity */
char    *optarg;                /* argument associated with option */

#define BADCH   (int)'?'
#define EMSG    ""
#define tell(s) fputs(*nargv,stderr);fputs(s,stderr); \
                fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);

int Getopt(int nargc, char *nargv[], char *ostr)
{
        static char     *place = EMSG;  /* option letter processing */
        static char     *lastostr = (char *) 0;
        register char   *oli;           /* option letter list index */
        char    *index();

        /* LANCE PATCH: dynamic reinitialization */
        if (ostr != lastostr) {
                lastostr = ostr;
                place = EMSG;
        }
        if(!*place) {                   /* update scanning pointer */
                if((optind >= nargc) || (*(place = nargv[optind]) != '-')
                                || ! *++place) {
                        place = EMSG;
                        return(EOF);
                }
                /* Test for "--" as terminator of options.  Note that
                   options which begin with "--" remain acceptable
                   (for example, "--help"); only "--" by itself
                   terminates the option list. */
                if (*place == '-' && place[1] == 0) {
                        ++optind;
                        return(EOF);
                }
        }                               /* option letter okay? */
        if ((optopt = (int)*place++) == (int)':' || !(oli = strchr(ostr, optopt))) {
                if(!*place) ++optind;
                tell(": invalid option -- ");
        }
        if (*++oli != ':') {            /* don't need argument */
                optarg = NULL;
                if (!*place) ++optind;
        }
        else {                          /* need an argument */
                if (*place) optarg = place;     /* no white space */
                else if (nargc <= ++optind) {   /* no arg */
                        place = EMSG;
                        tell(": option requires an argument -- ");
                }
                else optarg = nargv[optind];    /* white space */
                place = EMSG;
                ++optind;
        }
        return(optopt);                 /* dump back option letter */
}
#endif

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