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#if 0
41#ifndef lint
42static char sccsid[] = "@(#)egetopt.c	8.1 (Berkeley) 6/6/93";
43#endif /* not lint */
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD$");
48
49#include <ctype.h>
50#include <stdio.h>
51#include <string.h>
52
53#include "extern.h"
54
55/*
56 * egetopt:	get option letter from argument vector (an extended
57 *		version of getopt).
58 *
59 * Non standard additions to the ostr specs are:
60 * 1) '?': immediate value following arg is optional (no white space
61 *    between the arg and the value)
62 * 2) '#': +/- followed by a number (with an optional sign but
63 *    no white space between the arg and the number). The - may be
64 *    combined with other options, but the + cannot.
65 */
66
67int	eopterr = 1;		/* if error message should be printed */
68int	eoptind = 1;		/* index into parent argv vector */
69int	eoptopt;		/* character checked for validity */
70char	*eoptarg;		/* argument associated with option */
71
72#define	BADCH	(int)'?'
73
74static char	emsg[] = "";
75
76int
77egetopt(int nargc, char * const *nargv, const char *ostr)
78{
79	static char *place = emsg;	/* option letter processing */
80	char *oli;			/* option letter list index */
81	static int delim;		/* which option delimiter */
82	char *p;
83	static char savec = '\0';
84
85	if (savec != '\0') {
86		*place = savec;
87		savec = '\0';
88	}
89
90	if (!*place) {
91		/*
92		 * update scanning pointer
93		 */
94		if ((eoptind >= nargc) ||
95		    ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
96			place = emsg;
97			return (-1);
98		}
99
100		delim = (int)*place;
101		if (place[1] && *++place == '-' && !place[1]) {
102			/*
103			 * found "--"
104			 */
105			++eoptind;
106			place = emsg;
107			return (-1);
108		}
109	}
110
111	/*
112	 * check option letter
113	 */
114	if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
115	    !(oli = strchr(ostr, eoptopt))) {
116		/*
117		 * if the user didn't specify '-' as an option,
118		 * assume it means -1 when by itself.
119		 */
120		if ((eoptopt == (int)'-') && !*place)
121			return (-1);
122		if (strchr(ostr, '#') && (isdigit(eoptopt) ||
123		    (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
124		      isdigit(*place)))) {
125			/*
126			 * # option: +/- with a number is ok
127			 */
128			for (p = place; *p != '\0'; ++p) {
129				if (!isdigit(*p))
130					break;
131			}
132			eoptarg = place-1;
133
134			if (*p == '\0') {
135				place = emsg;
136				++eoptind;
137			} else {
138				place = p;
139				savec = *p;
140				*place = '\0';
141			}
142			return (delim);
143		}
144
145		if (!*place)
146			++eoptind;
147		if (eopterr) {
148			if (!(p = strrchr(*nargv, '/')))
149				p = *nargv;
150			else
151				++p;
152			(void)fprintf(stderr, "%s: illegal option -- %c\n",
153			    p, eoptopt);
154		}
155		return (BADCH);
156	}
157	if (delim == (int)'+') {
158		/*
159		 * '+' is only allowed with numbers
160		 */
161		if (!*place)
162			++eoptind;
163		if (eopterr) {
164			if (!(p = strrchr(*nargv, '/')))
165				p = *nargv;
166			else
167				++p;
168			(void)fprintf(stderr,
169				"%s: illegal '+' delimiter with option -- %c\n",
170				p, eoptopt);
171		}
172		return (BADCH);
173	}
174	++oli;
175	if ((*oli != ':') && (*oli != '?')) {
176		/*
177		 * don't need argument
178		 */
179		eoptarg = NULL;
180		if (!*place)
181			++eoptind;
182		return (eoptopt);
183	}
184
185	if (*place) {
186		/*
187		 * no white space
188		 */
189		eoptarg = place;
190	} else if (*oli == '?') {
191		/*
192		 * no arg, but NOT required
193		 */
194		eoptarg = NULL;
195	} else if (nargc <= ++eoptind) {
196		/*
197		 * no arg, but IS required
198		 */
199		place = emsg;
200		if (eopterr) {
201			if (!(p = strrchr(*nargv, '/')))
202				p = *nargv;
203			else
204				++p;
205			(void)fprintf(stderr,
206			    "%s: option requires an argument -- %c\n", p,
207			    eoptopt);
208		}
209		return (BADCH);
210	} else {
211		/*
212		 * arg has white space
213		 */
214		eoptarg = nargv[eoptind];
215	}
216	place = emsg;
217	++eoptind;
218	return (eoptopt);
219}
220