tools/power/acpi/common/getopt.c

   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 }