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
59 int eopterr = 1; /* if error message should be printed */
60 int eoptind = 1; /* index into parent argv vector */
61 int eoptopt; /* character checked for validity */
62 char *eoptarg; /* argument associated with option */
63
64 #define BADCH (int)'?'
65
66 static char emsg[] = "";
67
68 int
egetopt(int nargc,char * const * nargv,const char * ostr)69 egetopt(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