1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1992-1996,2003 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /* Copyright (c) 1988 AT&T */
28 /* All Rights Reserved */
29
30
31 #pragma ident "%Z%%M% %I% %E% SMI"
32
33 /*
34 * This file contains getoptstr(), which is getopt() for strings of arguments
35 * (not arrays of strings). It is used by the bootloader ({*fs,inet}boot) and
36 * the kernel to process argument strings.
37 */
38
39
40 #include "getoptstr.h"
41
42
43 /*
44 * This routine needs to be supplied by whatever uses this file.
45 */
46 char *strchr(const char *s, int c);
47
48
49 #define NULL ((void *)0)
50
51 #define ISNTWORDCH(c) ((c) == '\0' || ISSPACE(c))
52
53
54 /*
55 * Prepare a gos_params structure for use by getoptstr().
56 */
57 void
getoptstr_init(struct gos_params * params)58 getoptstr_init(struct gos_params *params)
59 {
60 params->gos_pos = 1;
61 }
62
63 /*
64 * Modeled after lib/libc/port/gen/getopt.c.
65 *
66 * With params->gos_opts set to a string of options and params->gos_strp set to
67 * an argument string, getoptstr returns
68 * * the next option letter, where the options are given by the
69 * params->gos_opts string. If the option is followed by a ':' in gos_opts,
70 * then params->gos_optargp will point to the beginning of the argument in
71 * the string, and params->gos_optarglen will contain its length.
72 * * -1 if "--" or a non-option argument is encountered. In the former
73 * case, params->gos_strp is advanced to the next argument.
74 * * '?' if an illegal option is encountered or if an argument is not
75 * supplied for an option which requires one and ':' is not the first
76 * character of opts. In both cases, the option letter is available in
77 * params->gos_last_opt, and in the former case, params->gos_errp will
78 * point to the offending character.
79 * * ':' if an argument is not supplied for an option which requires one and
80 * ':' is the first character of params->gos_opts.
81 */
82 int
getoptstr(struct gos_params * params)83 getoptstr(struct gos_params *params)
84 {
85 char c;
86 char *cp;
87
88 /*
89 * const because we should update params. Just make sure you don't
90 * use this after you update params->gos_strp.
91 */
92 const char * const strp = params->gos_strp;
93
94
95 if (params->gos_opts == NULL || strp == NULL)
96 return (-1);
97
98 if (params->gos_pos == 1) {
99 /* At beginning of new word. */
100
101 if (strp[0] == '\0' || strp[0] != '-')
102 return (-1);
103 if (ISNTWORDCH(strp[1])) {
104 /* Lone dash. */
105 return (-1);
106 }
107
108 /* Check for "--" */
109 if (strp[1] == '-' && ISNTWORDCH(strp[2])) {
110 params->gos_strp = &strp[2];
111 SKIP_SPC(params->gos_strp);
112 return (-1);
113 }
114 }
115
116 params->gos_last_opt = c = strp[params->gos_pos];
117 if (c == ':' || (cp = strchr(params->gos_opts, c)) == NULL) {
118 /* Unrecognized option error. */
119 params->gos_errp = &strp[params->gos_pos];
120 ++params->gos_pos;
121 if (ISNTWORDCH(strp[params->gos_pos])) {
122 params->gos_strp = &strp[params->gos_pos];
123 SKIP_SPC(params->gos_strp);
124 params->gos_pos = 1;
125 }
126 return ('?');
127 }
128
129 if (cp[1] == ':') {
130 /* This option expects an argument. */
131
132 params->gos_strp = &strp[params->gos_pos + 1];
133
134 if (ISNTWORDCH(*params->gos_strp)) {
135 /* The argument is in the next word. */
136 SKIP_SPC(params->gos_strp);
137
138 if (*params->gos_strp == '\0') {
139 /* Not. Missing argument. */
140 params->gos_pos = 1;
141 params->gos_optargp = NULL;
142 return (params->gos_opts[0] == ':' ? ':' : '?');
143 }
144 }
145
146 params->gos_optargp = params->gos_strp;
147
148 /* Advance to the next word. */
149 SKIP_WORD(params->gos_strp);
150 params->gos_optarglen = params->gos_strp - params->gos_optargp;
151 SKIP_SPC(params->gos_strp);
152
153 params->gos_pos = 1;
154 } else {
155 ++params->gos_pos;
156 if (ISNTWORDCH(strp[params->gos_pos])) {
157 params->gos_strp = &strp[params->gos_pos];
158 SKIP_SPC(params->gos_strp);
159 params->gos_pos = 1;
160 }
161 params->gos_optargp = NULL;
162 }
163 return (c);
164 }
165