1/* $NetBSD: egetopt.c,v 1.9 2011/09/06 18:26:06 joerg 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 1.9 2011/09/06 18:26:06 joerg 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}
