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From Ryan Bloom <...@raleigh.ibm.com>
Subject Re: Getopt problem...
Date Tue, 27 Jul 1999 13:25:04 GMT

Thanks, I was just about to commit the FreeBSD version, but I'll use yours
instead.

Ryan

On Tue, 27 Jul 1999, Jim Jagielski wrote:

> here's what I've been using (it's a modified FreeBSD version):
> 
> /*
>  * Copyright (c) 1987, 1993, 1994
>  *	The Regents of the University of California.  All rights reserved.
>  *
>  * Redistribution and use in source and binary forms, with or without
>  * modification, are permitted provided that the following conditions
>  * are met:
>  * 1. Redistributions of source code must retain the above copyright
>  *    notice, this list of conditions and the following disclaimer.
>  * 2. Redistributions in binary form must reproduce the above copyright
>  *    notice, this list of conditions and the following disclaimer in the
>  *    documentation and/or other materials provided with the distribution.
>  * 3. All advertising materials mentioning features or use of this software
>  *    must display the following acknowledgement:
>  *	This product includes software developed by the University of
>  *	California, Berkeley and its contributors.
>  * 4. Neither the name of the University nor the names of its
contributors
>  *    may be used to endorse or promote products derived from this software
>  *    without specific prior written permission.
>  *
>  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
>  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
>  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
>  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
>  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
>  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
>  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
>  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
>  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
>  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
>  * SUCH DAMAGE.
>  */
> 
> #include <stdio.h>
> #include <stdlib.h>
> #include <string.h>
> 
> int	opterr = 1,		/* if error message should be printed */
> 	optind = 1,		/* index into parent argv vector */
> 	optopt,			/* character checked for validity */
> 	optreset;		/* reset getopt */
> char	*optarg;		/* argument associated with option */
> 
> #define	BADCH	(int)'?'
> #define	BADARG	(int)':'
> #define	EMSG	""
> 
> /*
>  * getopt --
>  *	Parse argc/argv argument vector.
>  */
> int
> getopt(nargc, nargv, ostr)
> 	int nargc;
> 	char * const *nargv;
> 	const char *ostr;
> {
> 	char *p;
> 	static char *place = EMSG;		/* option letter processing */
> 	char *oli;				/* option letter list index */
> 
> 	if (optreset || !*place) {		/* update scanning pointer */
> 		optreset = 0;
> 		if (optind >= nargc || *(place = nargv[optind]) != '-') {
> 			place = EMSG;
> 			return (-1);
> 		}
> 		if (place[1] && *++place == '-') {	/* found "--" */
> 			++optind;
> 			place = EMSG;
> 			return (-1);
> 		}
> 	}					/* option letter okay? */
> 	if ((optopt = (int)*place++) == (int)':' ||
> 	    !(oli = strchr(ostr, optopt))) {
> 		/*
> 		 * if the user didn't specify '-' as an option,
> 		 * assume it means -1.
> 		 */
> 		if (optopt == (int)'-')
> 			return (-1);
> 		if (!*place)
> 			++optind;
> 		if (opterr && *ostr != ':') {
> 			if (!(p=strrchr(*nargv, '/')))
> 				p = *nargv;
> 			else
> 				++p;
> 			(void)fprintf(stderr,
> 			    "%s: illegal option -- %c\n", p, optopt);
> 		}
> 		return (BADCH);
> 	}
> 	if (*++oli != ':') {			/* don't need argument */
> 		optarg = NULL;
> 		if (!*place)
> 			++optind;
> 	}
> 	else {					/* need an argument */
> 		if (*place)			/* no white space */
> 			optarg = place;
> 		else if (nargc <= ++optind) {	/* no arg */
> 			place = EMSG;
> 			if (*ostr == ':')
> 				return (BADARG);
> 			if (opterr) {
> 				if (!(p=strrchr(*nargv, '/')))
> 					p = *nargv;
> 				else
> 					++p;
> 				(void)fprintf(stderr,
> 				    "%s: option requires an argument -- %c\n",
> 				    p, optopt);
> 			}
> 			return (BADCH);
> 		}
> 	 	else				/* white space */
> 			optarg = nargv[optind];
> 		place = EMSG;
> 		++optind;
> 	}
> 	return (optopt);			/* dump back option letter */
> }
> 
> 
> -- 
> ===========================================================================
>    Jim Jagielski   |||   jim@jaguNET.com   |||   http://www.jaguNET.com/
>             "That's no ordinary rabbit... that's the most foul,
>             cruel and bad-tempered rodent you ever laid eyes on"
> 

_______________________________________________________________________
Ryan Bloom		rbb@raleigh.ibm.com
4205 S Miami Blvd	
RTP, NC 27709		It's a beautiful sight to see good dancers 
			doing simple steps.  It's a painful sight to
			see beginners doing complicated patterns.	


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