1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
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. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the University of
22 *	California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40#include <sys/cdefs.h>
41#include <ctype.h>
42#include <stdio.h>
43#include <string.h>
44
45#include "extern.h"
46
47/*
48 * egetopt:	get option letter from argument vector (an extended
49 *		version of getopt).
50 *
51 * Non standard additions to the ostr specs are:
52 * 1) '?': immediate value following arg is optional (no white space
53 *    between the arg and the value)
54 * 2) '#': +/- followed by a number (with an optional sign but
55 *    no white space between the arg and the number). The - may be
56 *    combined with other options, but the + cannot.
57 */
58
59int	eopterr = 1;		/* if error message should be printed */
60int	eoptind = 1;		/* index into parent argv vector */
61int	eoptopt;		/* character checked for validity */
62char	*eoptarg;		/* argument associated with option */
63
64#define	BADCH	(int)'?'
65
66static char	emsg[] = "";
67
68int
69egetopt(int nargc, char * const *nargv, const char *ostr)
70{
71	static char *place = emsg;	/* option letter processing */
72	char *oli;			/* option letter list index */
73	static int delim;		/* which option delimiter */
74	char *p;
75	static char savec = '\0';
76
77	if (savec != '\0') {
78		*place = savec;
79		savec = '\0';
80	}
81
82	if (!*place) {
83		/*
84		 * update scanning pointer
85		 */
86		if ((eoptind >= nargc) ||
87		    ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
88			place = emsg;
89			return (-1);
90		}
91
92		delim = (int)*place;
93		if (place[1] && *++place == '-' && !place[1]) {
94			/*
95			 * found "--"
96			 */
97			++eoptind;
98			place = emsg;
99			return (-1);
100		}
101	}
102
103	/*
104	 * check option letter
105	 */
106	if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
107	    !(oli = strchr(ostr, eoptopt))) {
108		/*
109		 * if the user didn't specify '-' as an option,
110		 * assume it means -1 when by itself.
111		 */
112		if ((eoptopt == (int)'-') && !*place)
113			return (-1);
114		if (strchr(ostr, '#') && (isdigit(eoptopt) ||
115		    (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
116		      isdigit(*place)))) {
117			/*
118			 * # option: +/- with a number is ok
119			 */
120			for (p = place; *p != '\0'; ++p) {
121				if (!isdigit(*p))
122					break;
123			}
124			eoptarg = place-1;
125
126			if (*p == '\0') {
127				place = emsg;
128				++eoptind;
129			} else {
130				place = p;
131				savec = *p;
132				*place = '\0';
133			}
134			return (delim);
135		}
136
137		if (!*place)
138			++eoptind;
139		if (eopterr) {
140			if (!(p = strrchr(*nargv, '/')))
141				p = *nargv;
142			else
143				++p;
144			(void)fprintf(stderr, "%s: illegal option -- %c\n",
145			    p, eoptopt);
146		}
147		return (BADCH);
148	}
149	if (delim == (int)'+') {
150		/*
151		 * '+' is only allowed with numbers
152		 */
153		if (!*place)
154			++eoptind;
155		if (eopterr) {
156			if (!(p = strrchr(*nargv, '/')))
157				p = *nargv;
158			else
159				++p;
160			(void)fprintf(stderr,
161				"%s: illegal '+' delimiter with option -- %c\n",
162				p, eoptopt);
163		}
164		return (BADCH);
165	}
166	++oli;
167	if ((*oli != ':') && (*oli != '?')) {
168		/*
169		 * don't need argument
170		 */
171		eoptarg = NULL;
172		if (!*place)
173			++eoptind;
174		return (eoptopt);
175	}
176
177	if (*place) {
178		/*
179		 * no white space
180		 */
181		eoptarg = place;
182	} else if (*oli == '?') {
183		/*
184		 * no arg, but NOT required
185		 */
186		eoptarg = NULL;
187	} else if (nargc <= ++eoptind) {
188		/*
189		 * no arg, but IS required
190		 */
191		place = emsg;
192		if (eopterr) {
193			if (!(p = strrchr(*nargv, '/')))
194				p = *nargv;
195			else
196				++p;
197			(void)fprintf(stderr,
198			    "%s: option requires an argument -- %c\n", p,
199			    eoptopt);
200		}
201		return (BADCH);
202	} else {
203		/*
204		 * arg has white space
205		 */
206		eoptarg = nargv[eoptind];
207	}
208	place = emsg;
209	++eoptind;
210	return (eoptopt);
211}
212