1 /* $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $ */
2 /* SPDX-License-Identifier: BSD-3-Clause */
3 /*
4 * Copyright (c) 1987, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <string.h>
33 #ifdef CONFIG_ARCH_POSIX
34 #include <unistd.h>
35 #else
36 #include <zephyr/posix/unistd.h>
37 #endif
38 #include "getopt.h"
39 #include "getopt_common.h"
40
41 #include <zephyr/logging/log.h>
42 LOG_MODULE_REGISTER(getopt);
43
44 #define BADCH ((int)'?')
45 #define BADARG ((int)':')
46 #define EMSG ""
47
getopt_init(void)48 void getopt_init(void)
49 {
50 struct getopt_state *state;
51
52 state = getopt_state_get();
53
54 state->opterr = 1;
55 state->optind = 1;
56 state->optopt = 0;
57 state->optreset = 0;
58 state->optarg = NULL;
59
60 state->place = ""; /* EMSG */
61
62 #if CONFIG_GETOPT_LONG
63 state->nonopt_start = -1; /* first non option argument (for permute) */
64 state->nonopt_end = -1; /* first option after non options (for permute) */
65 #endif
66
67 opterr = 1;
68 optind = 1;
69 optopt = 0;
70 optreset = 0;
71 optarg = NULL;
72 }
73
74 /*
75 * getopt --
76 * Parse argc/argv argument vector.
77 */
getopt(int nargc,char * const nargv[],const char * ostr)78 int getopt(int nargc, char *const nargv[], const char *ostr)
79 {
80 struct getopt_state *state;
81 char *oli; /* option letter list index */
82
83 /* get getopt state of the current thread */
84 state = getopt_state_get();
85
86 if (state->optreset || *state->place == 0) { /* update scanning pointer */
87 state->optreset = 0;
88 state->place = nargv[state->optind];
89 if (state->optind >= nargc || *state->place++ != '-') {
90 /* Argument is absent or is not an option */
91 state->place = EMSG;
92 z_getopt_global_state_update(state);
93 return -1;
94 }
95 state->optopt = *state->place++;
96 if (state->optopt == '-' && *state->place == 0) {
97 /* "--" => end of options */
98 ++state->optind;
99 state->place = EMSG;
100 z_getopt_global_state_update(state);
101 return -1;
102 }
103 if (state->optopt == 0) {
104 /* Solitary '-', treat as a '-' option
105 * if the program (eg su) is looking for it.
106 */
107 state->place = EMSG;
108 if (strchr(ostr, '-') == NULL) {
109 z_getopt_global_state_update(state);
110 return -1;
111 }
112 state->optopt = '-';
113 }
114 } else {
115 state->optopt = *state->place++;
116 }
117
118 /* See if option letter is one the caller wanted... */
119 oli = strchr(ostr, state->optopt);
120 if (state->optopt == ':' || oli == NULL) {
121 if (*state->place == 0) {
122 ++state->optind;
123 }
124 if (state->opterr && *ostr != ':') {
125 LOG_ERR("illegal option -- %c", state->optopt);
126 }
127 z_getopt_global_state_update(state);
128 return BADCH;
129 }
130
131 /* Does this option need an argument? */
132 if (oli[1] != ':') {
133 /* don't need argument */
134 state->optarg = NULL;
135 if (*state->place == 0) {
136 ++state->optind;
137 }
138 } else {
139 /* Option-argument is either the rest of this argument or the
140 * entire next argument.
141 */
142 if (*state->place) {
143 state->optarg = state->place;
144 } else if (nargc > ++state->optind) {
145 state->optarg = nargv[state->optind];
146 } else {
147 /* option-argument absent */
148 state->place = EMSG;
149 if (*ostr == ':') {
150 z_getopt_global_state_update(state);
151 return BADARG;
152 }
153 if (state->opterr) {
154 LOG_ERR("option requires an argument -- %c",
155 state->optopt);
156 }
157 z_getopt_global_state_update(state);
158 return BADCH;
159 }
160 state->place = EMSG;
161 ++state->optind;
162 }
163 z_getopt_global_state_update(state);
164 return state->optopt; /* return option letter */
165 }
166
