1/*	$OpenBSD: egetopt.c,v 1.9 2013/11/26 13:19:07 deraadt Exp $	*/
2
3/*-
4 * Copyright (c) 1991 Keith Muller.
5 * Copyright (c) 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Keith Muller of the University of California, San Diego.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <ctype.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40
41#include "extern.h"
42
43/*
44 * egetopt:	get option letter from argument vector (an extended
45 *		version of getopt).
46 *
47 * Non standard additions to the ostr specs are:
48 * 1) '?': immediate value following arg is optional (no white space
49 *    between the arg and the value)
50 * 2) '#': +/- followed by a number (with an optional sign but
51 *    no white space between the arg and the number). The - may be
52 *    combined with other options, but the + cannot.
53 */
54
55int	eopterr = 1;		/* if error message should be printed */
56int	eoptind = 1;		/* index into parent argv vector */
57int	eoptopt;		/* character checked for validity */
58char	*eoptarg;		/* argument associated with option */
59
60#define	BADCH	(int)'?'
61#define	EMSG	""
62
63int
64egetopt(int nargc, char * const *nargv, const char *ostr)
65{
66	static char *place = EMSG;	/* option letter processing */
67	char *oli;			/* option letter list index */
68	static int delim;		/* which option delimiter */
69	char *p;
70	static char savec = '\0';
71
72	if (savec != '\0') {
73		*place = savec;
74		savec = '\0';
75	}
76
77	if (!*place) {
78		/*
79		 * update scanning pointer
80		 */
81		if ((eoptind >= nargc) ||
82		    ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
83			place = EMSG;
84			return (-1);
85		}
86
87		delim = (int)*place;
88		if (place[1] && *++place == '-' && !place[1]) {
89			/*
90			 * found "--"
91			 */
92			++eoptind;
93			place = EMSG;
94			return (-1);
95		}
96	}
97
98	/*
99	 * check option letter
100	 */
101	if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
102	    !(oli = strchr(ostr, eoptopt))) {
103		/*
104		 * if the user didn't specify '-' as an option,
105		 * assume it means EOF when by itself.
106		 */
107		if ((eoptopt == (int)'-') && !*place)
108			return (-1);
109		if (strchr(ostr, '#') && (isdigit((unsigned char)eoptopt) ||
110		    (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
111		      isdigit((unsigned char)*place)))) {
112			/*
113			 * # option: +/- with a number is ok
114			 */
115			for (p = place; *p != '\0'; ++p) {
116				if (!isdigit((unsigned char)*p))
117					break;
118			}
119			eoptarg = place-1;
120
121			if (*p == '\0') {
122				place = EMSG;
123				++eoptind;
124			} else {
125				place = p;
126				savec = *p;
127				*place = '\0';
128			}
129			return (delim);
130		}
131
132		if (!*place)
133			++eoptind;
134		if (eopterr) {
135			if (!(p = strrchr(*nargv, '/')))
136				p = *nargv;
137			else
138				++p;
139			(void)fprintf(stderr, "%s: illegal option -- %c\n",
140			    p, eoptopt);
141		}
142		return (BADCH);
143	}
144	if (delim == (int)'+') {
145		/*
146		 * '+' is only allowed with numbers
147		 */
148		if (!*place)
149			++eoptind;
150		if (eopterr) {
151			if (!(p = strrchr(*nargv, '/')))
152				p = *nargv;
153			else
154				++p;
155			(void)fprintf(stderr,
156				"%s: illegal '+' delimiter with option -- %c\n",
157				p, eoptopt);
158		}
159		return (BADCH);
160	}
161	++oli;
162	if ((*oli != ':') && (*oli != '?')) {
163		/*
164		 * don't need argument
165		 */
166		eoptarg = NULL;
167		if (!*place)
168			++eoptind;
169		return (eoptopt);
170	}
171
172	if (*place) {
173		/*
174		 * no white space
175		 */
176		eoptarg = place;
177	} else if (*oli == '?') {
178		/*
179		 * no arg, but NOT required
180		 */
181		eoptarg = NULL;
182	} else if (nargc <= ++eoptind) {
183		/*
184		 * no arg, but IS required
185		 */
186		place = EMSG;
187		if (eopterr) {
188			if (!(p = strrchr(*nargv, '/')))
189				p = *nargv;
190			else
191				++p;
192			(void)fprintf(stderr,
193			    "%s: option requires an argument -- %c\n", p,
194			    eoptopt);
195		}
196		return (BADCH);
197	} else {
198		/*
199		 * arg has white space
200		 */
201		eoptarg = nargv[eoptind];
202	}
203	place = EMSG;
204	++eoptind;
205	return (eoptopt);
206}
207