171 lines
6.8 KiB
C++
171 lines
6.8 KiB
C++
/* Arg_parser - POSIX/GNU command line argument parser. (C++ version)
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Copyright (C) 2006-2022 Antonio Diaz Diaz.
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This program is free software: you have unlimited permission to
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copy, distribute, and modify it.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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Exit status: 0 for a normal exit, 1 for environmental problems
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(file not found, invalid flags, I/O errors, etc), 2 to indicate a
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corrupt or invalid input file, 3 for an internal consistency error
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(e.g., bug) which caused arg_parser to panic.
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*/
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#include <climits>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <string>
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#include <vector>
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#include "arg_parser.h"
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namespace {
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const char * const program_name = "arg_parser";
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const char * const program_year = "2022";
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const char * invocation_name = program_name; // default value
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void show_help( const bool verbose )
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{
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std::printf( "Arg_parser - POSIX/GNU command line argument parser. (C++ version)\n"
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"\nArg_parser is an argument parser that follows POSIX and GNU conventions for\n"
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"command line arguments. There exist C++ and C versions of Arg_parser. The\n"
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"C++ version is implemented as a C++ class, while the C version is\n"
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"implemented as a single struct plus associated functions. Both are simpler,\n"
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"easier to use, and safer than 'getopt_long'.\n"
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"\nFor maximum stability, Arg_parser is self-contained. It extracts all the\n"
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"information it needs from its arguments to avoid refering to them later.\n"
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"This avoids index-out-of-bounds errors.\n"
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"\nArg_parser does not modify its arguments, nor uses any global variables. So\n"
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"you may create more than one parser in your program if you need or want to.\n"
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"\nThe C++ version of Arg_parser can also parse options from configuration\n"
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"files.\n"
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"\nTo use Arg_parser in your own programs simply copy the files 'arg_parser.h'\n"
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"and 'arg_parser.cc' in your source tree. See the file 'main.cc' for an\n"
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"example of use.\n"
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"\nUsage: %s [options]\n", invocation_name );
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std::printf( "\nOptions:\n"
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" -h, --help display this help and exit\n"
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" -V, --version output version information and exit\n"
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" -a, --append example of option with no argument\n"
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" -b, --block=<arg> example of option with required argument\n"
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" -c, --casual[=<arg>] example of option with optional argument\n"
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" -o <arg> example of short only option\n"
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" --orphan example of long only option\n"
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" -q, --quiet quiet operation\n"
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" -u, --uncaught example of intentional bug\n"
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" -v, --verbose verbose operation\n" );
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if( verbose )
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std::printf( " -H, --hidden example of hidden option (shown with -v -h)\n" );
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std::printf( "\nReport bugs to arg-parser-bug@nongnu.org\n"
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"Arg_parser home page: http://www.nongnu.org/arg-parser/arg_parser.html\n" );
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}
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void show_version()
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{
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std::printf( "%s %s\n", program_name, PROGVERSION );
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std::printf( "Copyright (C) %s Antonio Diaz Diaz.\n", program_year );
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std::printf( "License 2-clause BSD.\n"
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"This is free software: you are free to change and redistribute it.\n"
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"There is NO WARRANTY, to the extent permitted by law.\n" );
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}
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void show_error( const char * const msg, const int errcode = 0,
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const bool help = false )
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{
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if( msg && msg[0] )
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std::fprintf( stderr, "%s: %s%s%s\n", program_name, msg,
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( errcode > 0 ) ? ": " : "",
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( errcode > 0 ) ? std::strerror( errcode ) : "" );
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if( help )
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std::fprintf( stderr, "Try '%s --help' for more information.\n",
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invocation_name );
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}
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void internal_error( const char * const msg )
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{
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std::fprintf( stderr, "%s: internal error: %s\n", program_name, msg );
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std::exit( 3 );
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}
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} // end namespace
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int main( const int argc, const char * const argv[] )
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{
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bool verbose = false;
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if( argc > 0 ) invocation_name = argv[0];
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const Arg_parser::Option options[] =
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{
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{ 'a', "append", Arg_parser::no },
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{ 'b', "block", Arg_parser::yes },
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{ 'c', "casual", Arg_parser::maybe },
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{ 'h', "help", Arg_parser::no },
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{ 'H', "hidden", Arg_parser::no },
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{ 'o', 0, Arg_parser::yes },
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{ 'q', "quiet", Arg_parser::no },
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{ 'u', "uncaught", Arg_parser::no },
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{ 'v', "verbose", Arg_parser::no },
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{ 'V', "version", Arg_parser::no },
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{ 256, "orphan", Arg_parser::no },
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{ INT_MIN, "int-min", Arg_parser::no },
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{ INT_MAX, "int-max", Arg_parser::no },
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{ 0, 0, Arg_parser::no } };
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const Arg_parser parser( argc, argv, options );
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if( parser.error().size() ) // bad option
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{ show_error( parser.error().c_str(), 0, true ); return 1; }
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for( int argind = 0; argind < parser.arguments(); ++argind )
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{
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const int code = parser.code( argind );
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if( !code ) break; // no more options
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switch( code )
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{
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case 'a': break; // example, do nothing
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case 'b': break; // example, do nothing
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case 'c': break; // example, do nothing
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case 'h': show_help( verbose ); return 0;
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case 'H': break; // example, do nothing
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case 'o': break; // example, do nothing
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case 'q': verbose = false; break;
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// case 'u': break; // intentionally not caught
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case 'v': verbose = true; break;
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case 'V': show_version(); return 0;
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case 256: break; // example, do nothing
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case INT_MIN: break; // example, do nothing
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case INT_MAX: break; // example, do nothing
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default : internal_error( "uncaught option." );
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}
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} // end process options
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for( int argind = 0; argind < parser.arguments(); ++argind )
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{
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const int code = parser.code( argind );
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const char * const arg = parser.argument( argind ).c_str();
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if( code ) // option
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{
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std::printf( "option '%s'", parser.parsed_name( argind ).c_str() );
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if( arg[0] ) std::printf( " with argument '%s'", arg );
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if( code == INT_MIN || code == INT_MAX ) std::printf( " (code 0x%X)", code );
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}
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else // non-option
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std::printf( "non-option argument '%s'", arg );
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std::fputc( '\n', stdout );
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}
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if( !parser.arguments() ) std::fputs( "Hello, world!\n", stdout );
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return 0;
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}
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