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authorDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 16:11:02 +0000
committerDaniel Baumann <mail@daniel-baumann.ch>2015-11-07 16:11:02 +0000
commit4e47773f0570bdffefd062b85265242f9f13ef96 (patch)
tree815a38d504a9005ddd7f548c0067a43172f05a02 /arg_parser.cc
parentAdding upstream version 0.3. (diff)
downloadzutils-4e47773f0570bdffefd062b85265242f9f13ef96.tar.xz
zutils-4e47773f0570bdffefd062b85265242f9f13ef96.zip
Adding upstream version 0.4.upstream/0.4
Signed-off-by: Daniel Baumann <mail@daniel-baumann.ch>
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+/* Arg_parser - A POSIX/GNU command line argument parser.
+ Copyright (C) 2006, 2007, 2008, 2009 Antonio Diaz Diaz.
+
+ This program 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, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <cstring>
+#include <string>
+#include <vector>
+
+#include "arg_parser.h"
+
+
+bool Arg_parser::parse_long_option( const char * const opt, const char * const arg,
+ const Option options[], int & argind )
+ {
+ unsigned int len;
+ int index = -1;
+ bool exact = false, ambig = false;
+
+ for( len = 0; opt[len+2] && opt[len+2] != '='; ++len ) ;
+
+ // Test all long options for either exact match or abbreviated matches.
+ for( int i = 0; options[i].code != 0; ++i )
+ if( options[i].name && !std::strncmp( options[i].name, &opt[2], len ) )
+ {
+ if( std::strlen( options[i].name ) == len ) // Exact match found
+ { index = i; exact = true; break; }
+ else if( index < 0 ) index = i; // First nonexact match found
+ else if( options[index].code != options[i].code ||
+ options[index].has_arg != options[i].has_arg )
+ ambig = true; // Second or later nonexact match found
+ }
+
+ if( ambig && !exact )
+ {
+ error_ = "option `"; error_ += opt; error_ += "' is ambiguous";
+ return false;
+ }
+
+ if( index < 0 ) // nothing found
+ {
+ error_ = "unrecognized option `"; error_ += opt; error_ += '\'';
+ return false;
+ }
+
+ ++argind;
+ data.push_back( Record( options[index].code ) );
+
+ if( opt[len+2] ) // `--<long_option>=<argument>' syntax
+ {
+ if( options[index].has_arg == no )
+ {
+ error_ = "option `--"; error_ += options[index].name;
+ error_ += "' doesn't allow an argument";
+ return false;
+ }
+ if( options[index].has_arg == yes && !opt[len+3] )
+ {
+ error_ = "option `--"; error_ += options[index].name;
+ error_ += "' requires an argument";
+ return false;
+ }
+ data.back().argument = &opt[len+3];
+ return true;
+ }
+
+ if( options[index].has_arg == yes )
+ {
+ if( !arg || !arg[0] )
+ {
+ error_ = "option `--"; error_ += options[index].name;
+ error_ += "' requires an argument";
+ return false;
+ }
+ ++argind; data.back().argument = arg;
+ return true;
+ }
+
+ return true;
+ }
+
+
+bool Arg_parser::parse_short_option( const char * const opt, const char * const arg,
+ const Option options[], int & argind )
+ {
+ int cind = 1; // character index in opt
+
+ while( cind > 0 )
+ {
+ int index = -1;
+ const unsigned char c = opt[cind];
+
+ if( c != 0 )
+ for( int i = 0; options[i].code; ++i )
+ if( c == options[i].code )
+ { index = i; break; }
+
+ if( index < 0 )
+ {
+ error_ = "invalid option -- "; error_ += c;
+ return false;
+ }
+
+ data.push_back( Record( c ) );
+ if( opt[++cind] == 0 ) { ++argind; cind = 0; } // opt finished
+
+ if( options[index].has_arg != no && cind > 0 && opt[cind] )
+ {
+ data.back().argument = &opt[cind]; ++argind; cind = 0;
+ }
+ else if( options[index].has_arg == yes )
+ {
+ if( !arg || !arg[0] )
+ {
+ error_ = "option requires an argument -- "; error_ += c;
+ return false;
+ }
+ data.back().argument = arg; ++argind; cind = 0;
+ }
+ }
+ return true;
+ }
+
+
+Arg_parser::Arg_parser( const int argc, const char * const argv[],
+ const Option options[], const bool in_order )
+ {
+ if( argc < 2 || !argv || !options ) return;
+
+ std::vector< std::string > non_options; // skipped non-options
+ int argind = 1; // index in argv
+
+ while( argind < argc )
+ {
+ const unsigned char ch1 = argv[argind][0];
+ const unsigned char ch2 = ( ch1 ? argv[argind][1] : 0 );
+
+ if( ch1 == '-' && ch2 ) // we found an option
+ {
+ const char * const opt = argv[argind];
+ const char * const arg = (argind + 1 < argc) ? argv[argind+1] : 0;
+ if( ch2 == '-' )
+ {
+ if( !argv[argind][2] ) { ++argind; break; } // we found "--"
+ else if( !parse_long_option( opt, arg, options, argind ) ) break;
+ }
+ else if( !parse_short_option( opt, arg, options, argind ) ) break;
+ }
+ else
+ {
+ if( !in_order ) non_options.push_back( argv[argind++] );
+ else { data.push_back( Record() ); data.back().argument = argv[argind++]; }
+ }
+ }
+ if( error_.size() ) data.clear();
+ else
+ {
+ for( unsigned int i = 0; i < non_options.size(); ++i )
+ { data.push_back( Record() ); data.back().argument.swap( non_options[i] ); }
+ while( argind < argc )
+ { data.push_back( Record() ); data.back().argument = argv[argind++]; }
+ }
+ }
+
+
+Arg_parser::Arg_parser( const char * const opt, const char * const arg,
+ const Option options[] )
+ {
+ if( !opt || !opt[0] || !options ) return;
+
+ if( opt[0] == '-' && opt[1] ) // we found an option
+ {
+ int argind = 1; // dummy
+ if( opt[1] == '-' )
+ { if( opt[2] ) parse_long_option( opt, arg, options, argind ); }
+ else
+ parse_short_option( opt, arg, options, argind );
+ if( error_.size() ) data.clear();
+ }
+ else { data.push_back( Record() ); data.back().argument = opt; }
+ }