1/*	$NetBSD: egetopt.c,v 1.8 2009/04/13 00:37:05 lukem 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 <sys/cdefs.h>
37#ifndef lint
38#if 0
39from: static char sccsid[] = "@(#)egetopt.c	8.1 (Berkeley) 6/6/93";
40#else
41__RCSID("$NetBSD: egetopt.c,v 1.8 2009/04/13 00:37:05 lukem Exp $");
42#endif
43#endif /* not lint */
44
45#include <ctype.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49
50#include "extern.h"
51
52/*
53 * egetopt:	get option letter from argument vector (an extended
54 *		version of getopt).
55 *
56 * Non standard additions to the ostr specs are:
57 * 1) '?': immediate value following arg is optional (no white space
58 *    between the arg and the value)
59 * 2) '#': +/- followed by a number (with an optional sign but
60 *    no white space between the arg and the number). The - may be
61 *    combined with other options, but the + cannot.
62 */
63
64int	eopterr = 1;		/* if error message should be printed */
65int	eoptind = 1;		/* index into parent argv vector */
66int	eoptopt;		/* character checked for validity */
67char	*eoptarg;		/* argument associated with option */
68
69#define	BADCH	(int)'?'
70static char EMSG[1] = { '\0' };
71
72int
73egetopt(int nargc, char * const *nargv, const char *ostr)
74{
75	static char *place = EMSG;	/* option letter processing */
76	char *oli;			/* option letter list index */
77	static int delim;		/* which option delimiter */
78	char *p;
79	static char savec = '\0';
80
81	if (savec != '\0') {
82		*place = savec;
83		savec = '\0';
84	}
85
86	if (!*place) {
87		/*
88		 * update scanning pointer
89		 */
90		if ((eoptind >= nargc) ||
91		    ((*(place = nargv[eoptind]) != '-') && (*place != '+'))) {
92			place = EMSG;
93			return (-1);
94		}
95
96		delim = (int)*place;
97		if (place[1] && *++place == '-' && !place[1]) {
98			/*
99			 * found "--"
100			 */
101			++eoptind;
102			place = EMSG;
103			return (-1);
104		}
105	}
106
107	/*
108	 * check option letter
109	 */
110	if ((eoptopt = (int)*place++) == (int)':' || (eoptopt == (int)'?') ||
111	    !(oli = strchr(ostr, eoptopt))) {
112		/*
113		 * if the user didn't specify '-' as an option,
114		 * assume it means -1 when by itself.
115		 */
116		if ((eoptopt == (int)'-') && !*place)
117			return (-1);
118		if (strchr(ostr, '#') && (isdigit(eoptopt) ||
119		    (((eoptopt == (int)'-') || (eoptopt == (int)'+')) &&
120		      isdigit((unsigned char)*place)))) {
121			/*
122			 * # option: +/- with a number is ok
123			 */
124			for (p = place; *p != '\0'; ++p) {
125				if (!isdigit((unsigned char)*p))
126					break;
127			}
128			eoptarg = place-1;
129
130			if (*p == '\0') {
131				place = EMSG;
132				++eoptind;
133			} else {
134				place = p;
135				savec = *p;
136				*place = '\0';
137			}
138			return (delim);
139		}
140
141		if (!*place)
142			++eoptind;
143		if (eopterr) {
144			if (!(p = strrchr(*nargv, '/')))
145				p = *nargv;
146			else
147				++p;
148			(void)fprintf(stderr, "%s: illegal option -- %c\n",
149			    p, eoptopt);
150		}
151		return (BADCH);
152	}
153	if (delim == (int)'+') {
154		/*
155		 * '+' is only allowed with numbers
156		 */
157		if (!*place)
158			++eoptind;
159		if (eopterr) {
160			if (!(p = strrchr(*nargv, '/')))
161				p = *nargv;
162			else
163				++p;
164			(void)fprintf(stderr,
165				"%s: illegal '+' delimiter with option -- %c\n",
166				p, eoptopt);
167		}
168		return (BADCH);
169	}
170	++oli;
171	if ((*oli != ':') && (*oli != '?')) {
172		/*
173		 * don't need argument
174		 */
175		eoptarg = NULL;
176		if (!*place)
177			++eoptind;
178		return (eoptopt);
179	}
180
181	if (*place) {
182		/*
183		 * no white space
184		 */
185		eoptarg = place;
186	} else if (*oli == '?') {
187		/*
188		 * no arg, but NOT required
189		 */
190		eoptarg = NULL;
191	} else if (nargc <= ++eoptind) {
192		/*
193		 * no arg, but IS required
194		 */
195		place = EMSG;
196		if (eopterr) {
197			if (!(p = strrchr(*nargv, '/')))
198				p = *nargv;
199			else
200				++p;
201			(void)fprintf(stderr,
202			    "%s: option requires an argument -- %c\n", p,
203			    eoptopt);
204		}
205		return (BADCH);
206	} else {
207		/*
208		 * arg has white space
209		 */
210		eoptarg = nargv[eoptind];
211	}
212	place = EMSG;
213	++eoptind;
214	return (eoptopt);
215}
216