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