tools/power/acpi/common/getopt.c

   1 /******************************************************************************
   2  *
   3  * Module Name: getopt
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, 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 optional single-char sub-options
  51  *    "f|"      - Option has required single-char sub-options
  52  */
  53
  54 #include <acpi/acpi.h>
  55 #include "accommon.h"
  56 #include "acapps.h"
  57
  58 #define ACPI_OPTION_ERROR(msg, badchar) \
  59         if (acpi_gbl_opterr) {acpi_log_error ("%s%c\n", msg, badchar);}
  60
  61 int acpi_gbl_opterr = 1;
  62 int acpi_gbl_optind = 1;
  63 int acpi_gbl_sub_opt_char = 0;
  64 char *acpi_gbl_optarg;
  65
  66 static int current_char_ptr = 1;
  67
  68 /*******************************************************************************
  69  *
  70  * FUNCTION:    acpi_getopt_argument
  71  *
  72  * PARAMETERS:  argc, argv          - from main
  73  *
  74  * RETURN:      0 if an argument was found, -1 otherwise. Sets acpi_gbl_Optarg
  75  *              to point to the next argument.
  76  *
  77  * DESCRIPTION: Get the next argument. Used to obtain arguments for the
  78  *              two-character options after the original call to acpi_getopt.
  79  *              Note: Either the argument starts at the next character after
  80  *              the option, or it is pointed to by the next argv entry.
  81  *              (After call to acpi_getopt, we need to backup to the previous
  82  *              argv entry).
  83  *
  84  ******************************************************************************/
  85
  86 int acpi_getopt_argument(int argc, char **argv)
  87 {
  88
  89         acpi_gbl_optind--;
  90         current_char_ptr++;
  91
  92         if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
  93                 acpi_gbl_optarg =
  94                     &argv[acpi_gbl_optind++][(int)(current_char_ptr + 1)];
  95         } else if (++acpi_gbl_optind >= argc) {
  96                 ACPI_OPTION_ERROR("Option requires an argument: -", 'v');
  97
  98                 current_char_ptr = 1;
  99                 return (-1);
 100         } else {
 101                 acpi_gbl_optarg = argv[acpi_gbl_optind++];
 102         }
 103
 104         current_char_ptr = 1;
 105         return (0);
 106 }
 107
 108 /*******************************************************************************
 109  *
 110  * FUNCTION:    acpi_getopt
 111  *
 112  * PARAMETERS:  argc, argv          - from main
 113  *              opts                - options info list
 114  *
 115  * RETURN:      Option character or ACPI_OPT_END
 116  *
 117  * DESCRIPTION: Get the next option
 118  *
 119  ******************************************************************************/
 120
 121 int acpi_getopt(int argc, char **argv, char *opts)
 122 {
 123         int current_char;
 124         char *opts_ptr;
 125
 126         if (current_char_ptr == 1) {
 127                 if (acpi_gbl_optind >= argc ||
 128                     argv[acpi_gbl_optind][0] != '-' ||
 129                     argv[acpi_gbl_optind][1] == '\0') {
 130                         return (ACPI_OPT_END);
 131                 } else if (strcmp(argv[acpi_gbl_optind], "--") == 0) {
 132                         acpi_gbl_optind++;
 133                         return (ACPI_OPT_END);
 134                 }
 135         }
 136
 137         /* Get the option */
 138
 139         current_char = argv[acpi_gbl_optind][current_char_ptr];
 140
 141         /* Make sure that the option is legal */
 142
 143         if (current_char == ':' ||
 144             (opts_ptr = strchr(opts, current_char)) == NULL) {
 145                 ACPI_OPTION_ERROR("Illegal option: -", current_char);
 146
 147                 if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
 148                         acpi_gbl_optind++;
 149                         current_char_ptr = 1;
 150                 }
 151
 152                 return ('?');
 153         }
 154
 155         /* Option requires an argument? */
 156
 157         if (*++opts_ptr == ':') {
 158                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 159                         acpi_gbl_optarg =
 160                             &argv[acpi_gbl_optind++][(int)
 161                                                      (current_char_ptr + 1)];
 162                 } else if (++acpi_gbl_optind >= argc) {
 163                         ACPI_OPTION_ERROR("Option requires an argument: -",
 164                                           current_char);
 165
 166                         current_char_ptr = 1;
 167                         return ('?');
 168                 } else {
 169                         acpi_gbl_optarg = argv[acpi_gbl_optind++];
 170                 }
 171
 172                 current_char_ptr = 1;
 173         }
 174
 175         /* Option has an optional argument? */
 176
 177         else if (*opts_ptr == '+') {
 178                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 179                         acpi_gbl_optarg =
 180                             &argv[acpi_gbl_optind++][(int)
 181                                                      (current_char_ptr + 1)];
 182                 } else if (++acpi_gbl_optind >= argc) {
 183                         acpi_gbl_optarg = NULL;
 184                 } else {
 185                         acpi_gbl_optarg = argv[acpi_gbl_optind++];
 186                 }
 187
 188                 current_char_ptr = 1;
 189         }
 190
 191         /* Option has optional single-char arguments? */
 192
 193         else if (*opts_ptr == '^') {
 194                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 195                         acpi_gbl_optarg =
 196                             &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
 197                 } else {
 198                         acpi_gbl_optarg = "^";
 199                 }
 200
 201                 acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
 202                 acpi_gbl_optind++;
 203                 current_char_ptr = 1;
 204         }
 205
 206         /* Option has a required single-char argument? */
 207
 208         else if (*opts_ptr == '|') {
 209                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 210                         acpi_gbl_optarg =
 211                             &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
 212                 } else {
 213                         ACPI_OPTION_ERROR
 214                             ("Option requires a single-character suboption: -",
 215                              current_char);
 216
 217                         current_char_ptr = 1;
 218                         return ('?');
 219                 }
 220
 221                 acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
 222                 acpi_gbl_optind++;
 223                 current_char_ptr = 1;
 224         }
 225
 226         /* Option with no arguments */
 227
 228         else {
 229                 if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
 230                         current_char_ptr = 1;
 231                         acpi_gbl_optind++;
 232                 }
 233
 234                 acpi_gbl_optarg = NULL;
 235         }
 236
 237         return (current_char);
 238 }