1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3 *
4 * Module Name: getopt
5 *
6 * Copyright (C) 2000 - 2023, Intel Corp.
7 *
8 *****************************************************************************/
9
10 /*
11 * ACPICA getopt() implementation
12 *
13 * Option strings:
14 * "f" - Option has no arguments
15 * "f:" - Option requires an argument
16 * "f+" - Option has an optional argument
17 * "f^" - Option has optional single-char sub-options
18 * "f|" - Option has required single-char sub-options
19 */
20
21 #include <acpi/acpi.h>
22 #include "accommon.h"
23 #include "acapps.h"
24
25 #define ACPI_OPTION_ERROR(msg, badchar) \
26 if (acpi_gbl_opterr) {fprintf (stderr, "%s%c\n", msg, badchar);}
27
28 int acpi_gbl_opterr = 1;
29 int acpi_gbl_optind = 1;
30 int acpi_gbl_sub_opt_char = 0;
31 char *acpi_gbl_optarg;
32
33 static int current_char_ptr = 1;
34
35 /*******************************************************************************
36 *
37 * FUNCTION: acpi_getopt_argument
38 *
39 * PARAMETERS: argc, argv - from main
40 *
41 * RETURN: 0 if an argument was found, -1 otherwise. Sets acpi_gbl_Optarg
42 * to point to the next argument.
43 *
44 * DESCRIPTION: Get the next argument. Used to obtain arguments for the
45 * two-character options after the original call to acpi_getopt.
46 * Note: Either the argument starts at the next character after
47 * the option, or it is pointed to by the next argv entry.
48 * (After call to acpi_getopt, we need to backup to the previous
49 * argv entry).
50 *
51 ******************************************************************************/
52
53 int acpi_getopt_argument(int argc, char **argv)
54 {
55
56 acpi_gbl_optind--;
57 current_char_ptr++;
58
59 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
60 acpi_gbl_optarg =
61 &argv[acpi_gbl_optind++][(int)(current_char_ptr + 1)];
62 } else if (++acpi_gbl_optind >= argc) {
63 ACPI_OPTION_ERROR("\nOption requires an argument", 0);
64
65 current_char_ptr = 1;
66 return (-1);
67 } else {
68 acpi_gbl_optarg = argv[acpi_gbl_optind++];
69 }
70
71 current_char_ptr = 1;
72 return (0);
73 }
74
75 /*******************************************************************************
76 *
77 * FUNCTION: acpi_getopt
78 *
79 * PARAMETERS: argc, argv - from main
80 * opts - options info list
81 *
82 * RETURN: Option character or ACPI_OPT_END
83 *
84 * DESCRIPTION: Get the next option
85 *
86 ******************************************************************************/
87
88 int acpi_getopt(int argc, char **argv, char *opts)
89 {
90 int current_char;
91 char *opts_ptr;
92
93 if (current_char_ptr == 1) {
94 if (acpi_gbl_optind >= argc ||
95 argv[acpi_gbl_optind][0] != '-' ||
96 argv[acpi_gbl_optind][1] == '\0') {
97 return (ACPI_OPT_END);
98 } else if (strcmp(argv[acpi_gbl_optind], "--") == 0) {
99 acpi_gbl_optind++;
100 return (ACPI_OPT_END);
101 }
102 }
103
104 /* Get the option */
105
106 current_char = argv[acpi_gbl_optind][current_char_ptr];
107
108 /* Make sure that the option is legal */
109
110 if (current_char == ':' ||
111 (opts_ptr = strchr(opts, current_char)) == NULL) {
112 ACPI_OPTION_ERROR("Illegal option: -", current_char);
113
114 if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
115 acpi_gbl_optind++;
116 current_char_ptr = 1;
117 }
118
119 return ('?');
120 }
121
122 /* Option requires an argument? */
123
124 if (*++opts_ptr == ':') {
125 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
126 acpi_gbl_optarg =
127 &argv[acpi_gbl_optind++][(int)
128 (current_char_ptr + 1)];
129 } else if (++acpi_gbl_optind >= argc) {
130 ACPI_OPTION_ERROR("Option requires an argument: -",
131 current_char);
132
133 current_char_ptr = 1;
134 return ('?');
135 } else {
136 acpi_gbl_optarg = argv[acpi_gbl_optind++];
137 }
138
139 current_char_ptr = 1;
140 }
141
142 /* Option has an optional argument? */
143
144 else if (*opts_ptr == '+') {
145 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
146 acpi_gbl_optarg =
147 &argv[acpi_gbl_optind++][(int)
148 (current_char_ptr + 1)];
149 } else if (++acpi_gbl_optind >= argc) {
150 acpi_gbl_optarg = NULL;
151 } else {
152 acpi_gbl_optarg = argv[acpi_gbl_optind++];
153 }
154
155 current_char_ptr = 1;
156 }
157
158 /* Option has optional single-char arguments? */
159
160 else if (*opts_ptr == '^') {
161 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
162 acpi_gbl_optarg =
163 &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
164 } else {
165 acpi_gbl_optarg = "^";
166 }
167
168 acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
169 acpi_gbl_optind++;
170 current_char_ptr = 1;
171 }
172
173 /* Option has a required single-char argument? */
174
175 else if (*opts_ptr == '|') {
176 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
177 acpi_gbl_optarg =
178 &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
179 } else {
180 ACPI_OPTION_ERROR
181 ("Option requires a single-character suboption: -",
182 current_char);
183
184 current_char_ptr = 1;
185 return ('?');
186 }
187
188 acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
189 acpi_gbl_optind++;
190 current_char_ptr = 1;
191 }
192
193 /* Option with no arguments */
194
195 else {
196 if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
197 current_char_ptr = 1;
198 acpi_gbl_optind++;
199 }
200
201 acpi_gbl_optarg = NULL;
202 }
203
204 return (current_char);
205 }
206
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