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         acpi_gbl_optind--;
  89         current_char_ptr++;
  90
  91         if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
  92                 acpi_gbl_optarg =
  93                     &argv[acpi_gbl_optind++][(int)(current_char_ptr + 1)];
  94         } else if (++acpi_gbl_optind >= argc) {
  95                 ACPI_OPTION_ERROR("Option requires an argument: -", 'v');
  96
  97                 current_char_ptr = 1;
  98                 return (-1);
  99         } else {
 100                 acpi_gbl_optarg = argv[acpi_gbl_optind++];
 101         }
 102
 103         current_char_ptr = 1;
 104         return (0);
 105 }
 106
 107 /*******************************************************************************
 108  *
 109  * FUNCTION:    acpi_getopt
 110  *
 111  * PARAMETERS:  argc, argv          - from main
 112  *              opts                - options info list
 113  *
 114  * RETURN:      Option character or ACPI_OPT_END
 115  *
 116  * DESCRIPTION: Get the next option
 117  *
 118  ******************************************************************************/
 119
 120 int acpi_getopt(int argc, char **argv, char *opts)
 121 {
 122         int current_char;
 123         char *opts_ptr;
 124
 125         if (current_char_ptr == 1) {
 126                 if (acpi_gbl_optind >= argc ||
 127                     argv[acpi_gbl_optind][0] != '-' ||
 128                     argv[acpi_gbl_optind][1] == '\0') {
 129                         return (ACPI_OPT_END);
 130                 } else if (ACPI_STRCMP(argv[acpi_gbl_optind], "--") == 0) {
 131                         acpi_gbl_optind++;
 132                         return (ACPI_OPT_END);
 133                 }
 134         }
 135
 136         /* Get the option */
 137
 138         current_char = argv[acpi_gbl_optind][current_char_ptr];
 139
 140         /* Make sure that the option is legal */
 141
 142         if (current_char == ':' ||
 143             (opts_ptr = ACPI_STRCHR(opts, current_char)) == NULL) {
 144                 ACPI_OPTION_ERROR("Illegal option: -", current_char);
 145
 146                 if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
 147                         acpi_gbl_optind++;
 148                         current_char_ptr = 1;
 149                 }
 150
 151                 return ('?');
 152         }
 153
 154         /* Option requires an argument? */
 155
 156         if (*++opts_ptr == ':') {
 157                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 158                         acpi_gbl_optarg =
 159                             &argv[acpi_gbl_optind++][(int)
 160                                                      (current_char_ptr + 1)];
 161                 } else if (++acpi_gbl_optind >= argc) {
 162                         ACPI_OPTION_ERROR("Option requires an argument: -",
 163                                           current_char);
 164
 165                         current_char_ptr = 1;
 166                         return ('?');
 167                 } else {
 168                         acpi_gbl_optarg = argv[acpi_gbl_optind++];
 169                 }
 170
 171                 current_char_ptr = 1;
 172         }
 173
 174         /* Option has an optional argument? */
 175
 176         else if (*opts_ptr == '+') {
 177                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 178                         acpi_gbl_optarg =
 179                             &argv[acpi_gbl_optind++][(int)
 180                                                      (current_char_ptr + 1)];
 181                 } else if (++acpi_gbl_optind >= argc) {
 182                         acpi_gbl_optarg = NULL;
 183                 } else {
 184                         acpi_gbl_optarg = argv[acpi_gbl_optind++];
 185                 }
 186
 187                 current_char_ptr = 1;
 188         }
 189
 190         /* Option has optional single-char arguments? */
 191
 192         else if (*opts_ptr == '^') {
 193                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 194                         acpi_gbl_optarg =
 195                             &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
 196                 } else {
 197                         acpi_gbl_optarg = "^";
 198                 }
 199
 200                 acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
 201                 acpi_gbl_optind++;
 202                 current_char_ptr = 1;
 203         }
 204
 205         /* Option has a required single-char argument? */
 206
 207         else if (*opts_ptr == '|') {
 208                 if (argv[acpi_gbl_optind][(int)(current_char_ptr + 1)] != '\0') {
 209                         acpi_gbl_optarg =
 210                             &argv[acpi_gbl_optind][(int)(current_char_ptr + 1)];
 211                 } else {
 212                         ACPI_OPTION_ERROR
 213                             ("Option requires a single-character suboption: -",
 214                              current_char);
 215
 216                         current_char_ptr = 1;
 217                         return ('?');
 218                 }
 219
 220                 acpi_gbl_sub_opt_char = acpi_gbl_optarg[0];
 221                 acpi_gbl_optind++;
 222                 current_char_ptr = 1;
 223         }
 224
 225         /* Option with no arguments */
 226
 227         else {
 228                 if (argv[acpi_gbl_optind][++current_char_ptr] == '\0') {
 229                         current_char_ptr = 1;
 230                         acpi_gbl_optind++;
 231                 }
 232
 233                 acpi_gbl_optarg = NULL;
 234         }
 235
 236         return (current_char);
 237 }