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 __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
67 int eopterr = 1; /* if error message should be printed */
68 int eoptind = 1; /* index into parent argv vector */
69 int eoptopt; /* character checked for validity */
70 char *eoptarg; /* argument associated with option */
71
72 #define BADCH (int)'?'
73
74 static char emsg[] = "";
75
76 int
egetopt(int nargc,char * const * nargv,const char * ostr)77 egetopt(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