1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: getopt 5 * 6 * Copyright (C) 2000 - 2022, 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