tools/power/acpi/common/getopt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: getopt
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 /*
  45  * ACPICA getopt() implementation
  46  *
  47  * Option strings:
  48  *    "f"       - Option has no arguments
  49  *    "f:"      - Option requires an argument
  50  *    "f+"      - Option has an optional argument
  51  *    "f^"      - Option has optional single-char sub-options
  52  *    "f|"      - Option has required single-char sub-options
  53  */
  54
  55 #include <acpi/acpi.h>
  56 #include "accommon.h"
  57 #include "acapps.h"
  58
  59 #define ACPI_OPTION_ERROR(msg, badchar) \
  60         if (acpi_gbl_opterr) {acpi_log_error ("%s%c\n", msg, badchar);}
  61
  62 int acpi_gbl_opterr = 1;
  63 int acpi_gbl_optind = 1;
  64 int acpi_gbl_sub_opt_char = 0;
  65 char *acpi_gbl_optarg;
  66
  67 static int current_char_ptr = 1;
  68
  69 /*******************************************************************************
  70  *
  71  * FUNCTION:    acpi_getopt_argument
  72  *
  73  * PARAMETERS:  argc, argv          - from main
  74  *
  75  * RETURN:      0 if an argument was found, -1 otherwise. Sets acpi_gbl_Optarg
  76  *              to point to the next argument.
  77  *
  78  * DESCRIPTION: Get the next argument. Used to obtain arguments for the
  79  *              two-character options after the original call to acpi_getopt.
  80  *              Note: Either the argument starts at the next character after
  81  *              the option, or it is pointed to by the next argv entry.
  82  *              (After call to acpi_getopt, we need to backup to the previous
  83  *              argv entry).
  84  *
  85  ******************************************************************************/
  86
  87 int acpi_getopt_argument(int argc, char **argv)
  88 {
  89
  90         acpi_gbl_optind--;
  91         current_char_ptr++;
  92
  93         if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
  94                 acpi_gbl_optarg =
  95                     &argv[acpi_gbl_optind++][(int)(current_char_ptr + 1)];
  96         } else if (++acpi_gbl_optind >= argc) {
  97                 ACPI_OPTION_ERROR("Option requires an argument: -", 'v');
  98
  99                 current_char_ptr = 1;
 100                 return (-1);
 101         } else {
 102                 acpi_gbl_optarg = argv[acpi_gbl_optind++];
 103         }
 104
 105         current_char_ptr = 1;
 106         return (0);
 107 }
 108
 109 /*******************************************************************************
 110  *
 111  * FUNCTION:    acpi_getopt
 112  *
 113  * PARAMETERS:  argc, argv          - from main
 114  *              opts                - options info list
 115  *
 116  * RETURN:      Option character or ACPI_OPT_END
 117  *
 118  * DESCRIPTION: Get the next option
 119  *
 120  ******************************************************************************/
 121
 122 int acpi_getopt(int argc, char **argv, char *opts)
 123 {
 124         int current_char;
 125         char *opts_ptr;
 126
 127         if (current_char_ptr == 1) {
 128                 if (acpi_gbl_optind >= argc ||
 129                     argv[acpi_gbl_optind][0] != '-' ||
 130                     argv[acpi_gbl_optind][1] == '\0') {
 131                         return (ACPI_OPT_END);
 132                 } else if (strcmp(argv[acpi_gbl_optind], "--") == 0) {
 133                         acpi_gbl_optind++;
 134                         return (ACPI_OPT_END);
 135                 }
 136         }
 137
 138         /* Get the option */
 139
 140         current_char = argv[acpi_gbl_optind][current_char_ptr];
 141
 142         /* Make sure that the option is legal */
 143
 144         if (current_char == ':' ||
 145             (opts_ptr = strchr(opts, current_char)) == NULL) {
 146                 ACPI_OPTION_ERROR("Illegal option: -", current_char);
 147
 148                 if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
 149                         acpi_gbl_optind++;
 150                         current_char_ptr = 1;
 151                 }
 152
 153                 return ('?');
 154         }
 155
 156         /* Option requires an argument? */
 157
 158         if (*++opts_ptr == ':') {
 159                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 160                         acpi_gbl_optarg =
 161                             &argv[acpi_gbl_optind++][(int)
 162                                                      (current_char_ptr + 1)];
 163                 } else if (++acpi_gbl_optind >= argc) {
 164                         ACPI_OPTION_ERROR("Option requires an argument: -",
 165                                           current_char);
 166
 167                         current_char_ptr = 1;
 168                         return ('?');
 169                 } else {
 170                         acpi_gbl_optarg = argv[acpi_gbl_optind++];
 171                 }
 172
 173                 current_char_ptr = 1;
 174         }
 175
 176         /* Option has an optional argument? */
 177
 178         else if (*opts_ptr == '+') {
 179                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 180                         acpi_gbl_optarg =
 181                             &argv[acpi_gbl_optind++][(int)
 182                                                      (current_char_ptr + 1)];
 183                 } else if (++acpi_gbl_optind >= argc) {
 184                         acpi_gbl_optarg = NULL;
 185                 } else {
 186                         acpi_gbl_optarg = argv[acpi_gbl_optind++];
 187                 }
 188
 189                 current_char_ptr = 1;
 190         }
 191
 192         /* Option has optional single-char arguments? */
 193
 194         else if (*opts_ptr == '^') {
 195                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 196                         acpi_gbl_optarg =
 197                             &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
 198                 } else {
 199                         acpi_gbl_optarg = "^";
 200                 }
 201
 202                 acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
 203                 acpi_gbl_optind++;
 204                 current_char_ptr = 1;
 205         }
 206
 207         /* Option has a required single-char argument? */
 208
 209         else if (*opts_ptr == '|') {
 210                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 211                         acpi_gbl_optarg =
 212                             &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
 213                 } else {
 214                         ACPI_OPTION_ERROR
 215                             ("Option requires a single-character suboption: -",
 216                              current_char);
 217
 218                         current_char_ptr = 1;
 219                         return ('?');
 220                 }
 221
 222                 acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
 223                 acpi_gbl_optind++;
 224                 current_char_ptr = 1;
 225         }
 226
 227         /* Option with no arguments */
 228
 229         else {
 230                 if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
 231                         current_char_ptr = 1;
 232                         acpi_gbl_optind++;
 233                 }
 234
 235                 acpi_gbl_optarg = NULL;
 236         }
 237
 238         return (current_char);
 239 }