src/misc/getoptdata.h

   1 /* $Id: getoptdata.h 23245 2011-11-17 21:18:24Z rubidium $ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file getoptdata.h Library for parsing command-line options. */
  11
  12 #ifndef GETOPTDATA_H
  13 #define GETOPTDATA_H
  14
  15 /** Flags of an option. */
  16 enum OptionDataFlags {
  17         ODF_NO_VALUE,       ///< A plain option (no value attached to it).
  18         ODF_HAS_VALUE,      ///< An option with a value.
  19         ODF_OPTIONAL_VALUE, ///< An option with an optional value.
  20         ODF_END,            ///< Terminator (data is not parsed further).
  21 };
  22
  23 /** Data of an option. */
  24 struct OptionData {
  25         byte id;              ///< Unique identification of this option data, often the same as #shortname.
  26         char shortname;       ///< Short option letter if available, else use \c '\0'.
  27         uint16 flags;         ///< Option data flags. @see OptionDataFlags
  28         const char *longname; ///< Long option name including '-'/'--' prefix, use \c nullptr if not available.
  29 };
  30
  31 /** Data storage for parsing command line options. */
  32 struct GetOptData {
  33         char *opt;                 ///< Option value, if available (else \c nullptr).
  34         int numleft;               ///< Number of arguments left in #argv.
  35         char **argv;               ///< Remaining command line arguments.
  36         const OptionData *options; ///< Command line option descriptions.
  37         char *cont;                ///< Next call to #MyGetOpt should start here (in the middle of an argument).
  38
  39         /**
  40          * Constructor of the data store.
  41          * @param argc Number of command line arguments, excluding the program name.
  42          * @param argv Command line arguments, excluding the program name.
  43          * @param options Command line option descriptions.
  44          */
  45         GetOptData(int argc, char **argv, const OptionData *options) :
  46                         opt(nullptr),
  47                         numleft(argc),
  48                         argv(argv),
  49                         options(options),
  50                         cont(nullptr)
  51         {
  52         }
  53
  54         int GetOpt();
  55 };
  56
  57 /**
  58  * General macro for creating an option.
  59  * @param id        Identification of the option.
  60  * @param shortname Short option name. Use \c '\0' if not used.
  61  * @param longname  Long option name including leading '-' or '--'. Use \c nullptr if not used.
  62  * @param flags     Flags of the option.
  63  */
  64 #define GETOPT_GENERAL(id, shortname, longname, flags) { id, shortname, flags, longname }
  65
  66 /**
  67  * Short option without value.
  68  * @param shortname Short option name. Use \c '\0' if not used.
  69  * @param longname  Long option name including leading '-' or '--'. Use \c nullptr if not used.
  70  */
  71 #define GETOPT_NOVAL(shortname, longname) GETOPT_GENERAL(shortname, shortname, longname, ODF_NO_VALUE)
  72
  73 /**
  74  * Short option with value.
  75  * @param shortname Short option name. Use \c '\0' if not used.
  76  * @param longname  Long option name including leading '-' or '--'. Use \c nullptr if not used.
  77  */
  78 #define GETOPT_VALUE(shortname, longname) GETOPT_GENERAL(shortname, shortname, longname, ODF_HAS_VALUE)
  79
  80 /**
  81  * Short option with optional value.
  82  * @param shortname Short option name. Use \c '\0' if not used.
  83  * @param longname  Long option name including leading '-' or '--'. Use \c nullptr if not used.
  84  * @note Options with optional values are hopelessly ambiguous, eg "-opt -value", avoid them.
  85  */
  86 #define GETOPT_OPTVAL(shortname, longname) GETOPT_GENERAL(shortname, shortname, longname, ODF_OPTIONAL_VALUE)
  87
  88
  89 /**
  90  * Short option without value.
  91  * @param shortname Short option name. Use \c '\0' if not used.
  92  */
  93 #define GETOPT_SHORT_NOVAL(shortname) GETOPT_NOVAL(shortname, nullptr)
  94
  95 /**
  96  * Short option with value.
  97  * @param shortname Short option name. Use \c '\0' if not used.
  98  */
  99 #define GETOPT_SHORT_VALUE(shortname) GETOPT_VALUE(shortname, nullptr)
 100
 101 /**
 102  * Short option with optional value.
 103  * @param shortname Short option name. Use \c '\0' if not used.
 104  * @note Options with optional values are hopelessly ambiguous, eg "-opt -value", avoid them.
 105  */
 106 #define GETOPT_SHORT_OPTVAL(shortname) GETOPT_OPTVAL(shortname, nullptr)
 107
 108 /** Option terminator. */
 109 #define GETOPT_END() { '\0', '\0', ODF_END, nullptr}
 110
 111
 112 #endif /* GETOPTDATA_H */