xref: /illumos-gate/usr/src/boot/libsa/getopt.c (revision 22028508)
1199767f8SToomas Soome /*
2199767f8SToomas Soome  * Copyright (c) 1987, 1993, 1994
3199767f8SToomas Soome  *	The Regents of the University of California.  All rights reserved.
4199767f8SToomas Soome  *
5199767f8SToomas Soome  * Redistribution and use in source and binary forms, with or without
6199767f8SToomas Soome  * modification, are permitted provided that the following conditions
7199767f8SToomas Soome  * are met:
8199767f8SToomas Soome  * 1. Redistributions of source code must retain the above copyright
9199767f8SToomas Soome  *    notice, this list of conditions and the following disclaimer.
10199767f8SToomas Soome  * 2. Redistributions in binary form must reproduce the above copyright
11199767f8SToomas Soome  *    notice, this list of conditions and the following disclaimer in the
12199767f8SToomas Soome  *    documentation and/or other materials provided with the distribution.
131974da4bSToomas Soome  * 3. Neither the name of the University nor the names of its contributors
14199767f8SToomas Soome  *    may be used to endorse or promote products derived from this software
15199767f8SToomas Soome  *    without specific prior written permission.
16199767f8SToomas Soome  *
17199767f8SToomas Soome  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18199767f8SToomas Soome  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19199767f8SToomas Soome  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20199767f8SToomas Soome  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21199767f8SToomas Soome  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22199767f8SToomas Soome  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23199767f8SToomas Soome  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24199767f8SToomas Soome  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25199767f8SToomas Soome  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26199767f8SToomas Soome  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27199767f8SToomas Soome  * SUCH DAMAGE.
28199767f8SToomas Soome  */
29199767f8SToomas Soome 
30199767f8SToomas Soome #include <sys/cdefs.h>
31199767f8SToomas Soome __FBSDID("$FreeBSD$");
32199767f8SToomas Soome 
33199767f8SToomas Soome #if defined(LIBC_SCCS) && !defined(lint)
34199767f8SToomas Soome static char sccsid[] = "@(#)getopt.c	8.3 (Berkeley) 4/27/95";
35199767f8SToomas Soome #endif /* LIBC_SCCS and not lint */
36199767f8SToomas Soome 
37199767f8SToomas Soome #include "stand.h"
38199767f8SToomas Soome #include <string.h>
39199767f8SToomas Soome 
40199767f8SToomas Soome int	opterr = 1,		/* if error message should be printed */
41199767f8SToomas Soome 	optind = 1,		/* index into parent argv vector */
42199767f8SToomas Soome 	optopt,			/* character checked for validity */
43199767f8SToomas Soome 	optreset;		/* reset getopt */
44199767f8SToomas Soome char	*optarg;		/* argument associated with option */
45199767f8SToomas Soome 
46199767f8SToomas Soome #define	BADCH	(int)'?'
47199767f8SToomas Soome #define	BADARG	(int)':'
48199767f8SToomas Soome #define	EMSG	""
49199767f8SToomas Soome 
50199767f8SToomas Soome /*
51199767f8SToomas Soome  * getopt --
52199767f8SToomas Soome  *	Parse argc/argv argument vector.
53199767f8SToomas Soome  */
54199767f8SToomas Soome int
getopt(int nargc,char * const * nargv,const char * ostr)55199767f8SToomas Soome getopt(int nargc, char * const *nargv, const char *ostr)
56199767f8SToomas Soome {
57199767f8SToomas Soome 	static char *place = EMSG;		/* option letter processing */
58199767f8SToomas Soome 	char *oli;				/* option letter list index */
59199767f8SToomas Soome 
60199767f8SToomas Soome 	if (optreset || !*place) {		/* update scanning pointer */
61199767f8SToomas Soome 		optreset = 0;
62199767f8SToomas Soome 		if (optind >= nargc || *(place = nargv[optind]) != '-') {
63199767f8SToomas Soome 			place = EMSG;
64199767f8SToomas Soome 			return (-1);
65199767f8SToomas Soome 		}
66199767f8SToomas Soome 		if (place[1] && *++place == '-') {	/* found "--" */
67199767f8SToomas Soome 			++optind;
68199767f8SToomas Soome 			place = EMSG;
69199767f8SToomas Soome 			return (-1);
70199767f8SToomas Soome 		}
71199767f8SToomas Soome 	}					/* option letter okay? */
72199767f8SToomas Soome 	if ((optopt = (int)*place++) == (int)':' ||
73199767f8SToomas Soome 	    !(oli = strchr(ostr, optopt))) {
74199767f8SToomas Soome 		/*
75199767f8SToomas Soome 		 * if the user didn't specify '-' as an option,
76199767f8SToomas Soome 		 * assume it means -1.
77199767f8SToomas Soome 		 */
78199767f8SToomas Soome 		if (optopt == (int)'-')
79199767f8SToomas Soome 			return (-1);
80199767f8SToomas Soome 		if (!*place)
81199767f8SToomas Soome 			++optind;
82199767f8SToomas Soome 		if (opterr && *ostr != ':')
83199767f8SToomas Soome 			(void)printf("illegal option -- %c\n", optopt);
84199767f8SToomas Soome 		return (BADCH);
85199767f8SToomas Soome 	}
86199767f8SToomas Soome 	if (*++oli != ':') {			/* don't need argument */
87199767f8SToomas Soome 		optarg = NULL;
88199767f8SToomas Soome 		if (!*place)
89199767f8SToomas Soome 			++optind;
90199767f8SToomas Soome 	}
91199767f8SToomas Soome 	else {					/* need an argument */
92199767f8SToomas Soome 		if (*place)			/* no white space */
93199767f8SToomas Soome 			optarg = place;
94199767f8SToomas Soome 		else if (nargc <= ++optind) {	/* no arg */
95199767f8SToomas Soome 			place = EMSG;
96199767f8SToomas Soome 			if (*ostr == ':')
97199767f8SToomas Soome 				return (BADARG);
98199767f8SToomas Soome 			if (opterr)
99199767f8SToomas Soome 				(void)printf("option requires an argument -- %c\n", optopt);
100199767f8SToomas Soome 			return (BADCH);
101199767f8SToomas Soome 		}
102199767f8SToomas Soome 	 	else				/* white space */
103199767f8SToomas Soome 			optarg = nargv[optind];
104199767f8SToomas Soome 		place = EMSG;
105199767f8SToomas Soome 		++optind;
106199767f8SToomas Soome 	}
107199767f8SToomas Soome 	return (optopt);			/* dump back option letter */
108199767f8SToomas Soome }
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