[unix-history] / lib / libc / stdlib / getopt.c

/*
 * Copyright (c) 1987 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
/*static char *sccsid = "from: @(#)getopt.c	4.13 (Berkeley) 2/23/91";*/
static char *rcsid = "$Id: getopt.c,v 1.5 1993/10/12 21:52:45 jtc Exp $";
#endif /* LIBC_SCCS and not lint */

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

/*
 * get option letter from argument vector
 */
int	opterr = 1;		/* if error message should be printed */
int	optind = 1;		/* index into parent argv vector */
int	optopt;			/* character checked for validity */
char	*optarg;		/* argument associated with option */

#define NOOPT	(int)':'	/* No option */
#define	BADCH	(int)'?'
#define	EMSG	""

int
getopt(nargc, nargv, ostr)
	int nargc;
	char * const *nargv;
	const char *ostr;
{
	static char *place = EMSG;		/* option letter processing */
	register char *oli;			/* option letter list index */
	char *p;

	if (!*place) {				/* update scanning pointer */
		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 (opterr && *ostr != ':') {
				if (!(p = strrchr(*nargv, '/')))
					p = *nargv;
				else
					++p;
				(void)fprintf(stderr,
				    "%s: option requires an argument -- %c\n",
				    p, optopt);
			}
			return((*ostr == ':') ? NOOPT : BADCH);
		}
	 	else				/* white space */
			optarg = nargv[optind];
		place = EMSG;
		++optind;
	}
	return(optopt);				/* dump back option letter */
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1987 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#if defined(LIBC_SCCS) && !defined(lint)
dee6c867 C	35	/static char sccsid = "from: @(#)getopt.c 4.13 (Berkeley) 2/23/91";*/
dee6c867 C	36	static char *rcsid = "$Id: getopt.c,v 1.5 1993/10/12 21:52:45 jtc Exp $";
15637ed4 RG	37	#endif /* LIBC_SCCS and not lint */
	38
	39	#include <stdio.h>
	40	#include <stdlib.h>
	41	#include <string.h>
	42
	43	/*
	44	* get option letter from argument vector
	45	*/
dee6c867 C	46	int opterr = 1; /* if error message should be printed */
	47	int optind = 1; /* index into parent argv vector */
	48	int optopt; /* character checked for validity */
15637ed4 RG	49	char optarg; / argument associated with option */
15637ed4 RG	50
dee6c867	51	#define NOOPT (int)':' /* No option */
15637ed4 RG	52	#define BADCH (int)'?'
	53	#define EMSG ""
	54
	55	int
	56	getopt(nargc, nargv, ostr)
	57	int nargc;
	58	char * const *nargv;
	59	const char *ostr;
	60	{
	61	static char place = EMSG; / option letter processing */
	62	register char oli; / option letter list index */
	63	char *p;
	64
	65	if (!place) { / update scanning pointer */
	66	if (optind >= nargc \|\| *(place = nargv[optind]) != '-') {
	67	place = EMSG;
dee6c867	68	return(-1);
15637ed4 RG	69	}
	70	if (place[1] && ++place == '-') { / found "--" */
	71	++optind;
	72	place = EMSG;
dee6c867	73	return(-1);
15637ed4	74	}
dee6c867 C	75	}
dee6c867 C	76	/* option letter okay? */
15637ed4	77	if ((optopt = (int)*place++) == (int)':' \|\|
dee6c867	78	!(oli = strchr(ostr, optopt))) {
15637ed4 RG	79	/*
15637ed4 RG	80	* if the user didn't specify '-' as an option,
dee6c867	81	* assume it means -1.
15637ed4 RG	82	*/
15637ed4 RG	83	if (optopt == (int)'-')
dee6c867	84	return(-1);
15637ed4 RG	85	if (!*place)
15637ed4 RG	86	++optind;
dee6c867 C	87	if (opterr && *ostr != ':') {
dee6c867 C	88	if (!(p = strrchr(*nargv, '/')))
15637ed4 RG	89	p = *nargv;
	90	else
	91	++p;
	92	(void)fprintf(stderr, "%s: illegal option -- %c\n",
	93	p, optopt);
	94	}
	95	return(BADCH);
	96	}
dee6c867	97
15637ed4 RG	98	if (++oli != ':') { / don't need argument */
	99	optarg = NULL;
	100	if (!*place)
	101	++optind;
dee6c867	102	} else { /* need an argument */
15637ed4 RG	103	if (place) / no white space */
	104	optarg = place;
	105	else if (nargc <= ++optind) { /* no arg */
	106	place = EMSG;
dee6c867 C	107	if (opterr && *ostr != ':') {
	108	if (!(p = strrchr(*nargv, '/')))
	109	p = *nargv;
	110	else
	111	++p;
15637ed4 RG	112	(void)fprintf(stderr,
	113	"%s: option requires an argument -- %c\n",
	114	p, optopt);
dee6c867 C	115	}
dee6c867 C	116	return((*ostr == ':') ? NOOPT : BADCH);
15637ed4 RG	117	}
	118	else /* white space */
	119	optarg = nargv[optind];
	120	place = EMSG;
	121	++optind;
	122	}
	123	return(optopt); /* dump back option letter */
	124	}