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88 lines
3.3 KiB
C
88 lines
3.3 KiB
C
3 years ago
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// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file argv.h
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*
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* Command line argument parsing library.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*/
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#ifndef DF_ARGV_H_
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#define DF_ARGV_H_
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#include "utf/utfdef.h"
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#ifdef _WIN32
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// DOS-style options are preferred
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#define OPTCHAR '/'
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#define OPTSEP ':'
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#else
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// Unix-style options
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#define OPTCHAR '-'
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#define OPTSEP '='
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#endif
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typedef enum {
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ARG_NONE, ///< `Optflag` takes no argument
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ARG_REQ, ///< `Optflag` with mandatory argument
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ARG_OPT ///< `Optflag` may take an optional argument
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} Optarg;
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typedef struct {
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Rune opt; ///< Set to `\0` to signal `Optflag` list end
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const char *longopt; ///< Optional long name for this option
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const char *argName; ///< Human readable descriptive argument name, ignored if `hasArg == ARG_NONE`
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const char *descr; ///< Human readable description for option, displayed in help message
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Optarg hasArg; ///< Whether an argument to this `Optflag` is mandatory, optional or prohibited
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// Following fields are altered by `Com_ArgParse()` when flag is
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// encountered.
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// If option doesn't appear inside `argv`, then following fields are left
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// untouched (thus using them to provide default values is legal)
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Boolean flagged; ///< Set to `TRUE` if option was found in command line
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char *optarg; ///< Set to a pointer inside `argv` when argument for this option is found
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} Optflag;
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extern const char *com_progName; ///< If set to non-NULL string, it is used to provide a program name during `Com_ArgParse()`, instead of `argv[0]`
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extern const char *com_synopsis; ///< If set to non-NULL string, provides a short synopsis for `Com_ArgParse()` usage message
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extern const char *com_shortDescr; ///< If set to non-NULL string, provides a brief command summary for `Com_ArgParse()` usage message
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extern const char *com_longDescr; ///< If set to non-NULL string, provides a long description for `Com_ArgParse()` usage message
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/// Do not emit error messages or help message automatically to `stderr`.
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#define ARG_QUIET BIT(0)
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/// Do not perform GNU-like command flags reordering.
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#define ARG_NOREORD BIT(1)
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/// The provided `Optflag` list is ill-formed (e.g. option with `opt == '-' && longopt == NULL` was found)
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#define OPT_BADLIST -1
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/// Missing required option argument
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#define OPT_ARGMISS -2
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/// Excess argument inside long option that requires none (e.g. `--foo=bar`, but `foo->hasArg == ARG_NONE`)
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#define OPT_EXCESSARG -3
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/// Encountered unknown option
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#define OPT_UNKNOWN -4
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/// Parsing terminated because help option was requested (-h, -?, --help or platform specific equivalents)
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#define OPT_HELP -5
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/// Command line is ambiguous
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#define OPT_BADARGV -6
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/**
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* Parse command line arguments, updating relevant option flags.
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*
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* \param [in] argc Argument count
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* \param [in] argv Argument vector`
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* \param [in,out] options Option flag list
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* \param [in] flags Parsing flags (`ARG_*` bit mask)
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*
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* \return Number of argument parsed or an appropriate error value:
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* * On success the number of parsed arguments is returned (>= 0)
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* * If the help option was requested then `OPT_HELP` is returned
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* * If argument list is ill-formed, an error code is returned (`OPT_*`)
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*/
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int Com_ArgParse(int argc, char **argv, Optflag *options, unsigned flags);
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#endif
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