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"[-o output_file] [-l limit] \n\t" "file_name\n\t[file_name [file_name [ ]]]\n\n" "where [] indicates optional option:\n\n\t" "-h: help\n\t\t" "generates this message and exits\n\n\t" "-v: version\n\t\t" "prints version information and exits\n\n\t" "-d: debug\n\t\tturns debugging on\n\n\t" "-l limit\n\t\t" "limit must be a non-negative integer\n\n\t" "-o ofile\n\t\t" "file within which to write out results\n\t\t" "by default, results written to standard output\n\n" "file_name\n\t\t" "the name of the actual file to process\n\t\t" "at least one file_name is required --\n\t\t" "any number may be specified\n\n" "examples:\n\t\t" "$command chapter7doc\n\t\t" "$command -d -l 1024 -o test_7_8 " "chapter7doc chapter8doc\n\n"; exit( exit_value ); } int main( int argc, char* argv[] ) { bool debug_on = false; bool ofile_on = false; bool limit_on = false; int limit = -1; string ofile; vector<string, allocator> file_names; cout "illustration of handling command line arguments:\n" "argc: " argc endl; for ( int ix = 1; ix < argc; ++ix ) { cout "argv[ " ix " ]: " argv[ ix ] endl; char *pchar = argv[ ix ]; switch ( pchar[ 0 ] ) { case '-': { cout "case \'-\' found\n"; switch( pchar[ 1 ] ) { case 'd': cout "-d found: " "debugging turned on\n"; debug_on = true; break; case 'v': cout "-v found: " "version info displayed\n"; cout program_name " :: "
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program_version endl; return 0; case 'h': cout "-h found: " "help information\n"; // no break necessary: usage() exits usage(); case 'o': cout "-o found: output file\n"; ofile_on = true; break; case 'l': cout "-l found: " "resource limit\n"; limit_on = true; break; default: cerr program_name " : error : " "unrecognized option: - " pchar "\n\n"; // no break necessary: usage() exits usage( -1 ); } break; } default: // either a file name cout "default nonhyphen argument: " pchar endl; if ( ofile_on ) { ofile_on = false; ofile = pchar; } else if ( limit_on ) { limit_on = false; limit = atoi( pchar ); if ( limit < 0 ) { cerr program_name " : error : " "negative value for limit\n\n"; usage( -2 ); } } else file_namespush_back( string( pchar )); break; } } if ( file_namesempty() ) { cerr program_name " : error : " "no file specified for processing\n\n"; usage( -3 ); }
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if ( limit != -1 ) cout "User-specifed limit: " limit endl; if ( ! ofileempty() ) cout "User-specified output file: " ofile endl; cout (file_namessize() == 1 "File " : "Files ") "to be processed are the following:\n"; for ( int inx = 0; inx < file_namessize(); ++inx ) cout "\t" file_names[ inx ] endl; }
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aout -d -l 1024 -o test_7_8 chapter7doc chapter8doc
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Here is the trace of the processing of the command line options:
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illustration of handling command line arguments: argc: 8 argv[ 1 ]: -d case '-' found -d found: debugging turned on argv[ 2 ]: -l case '-' found -l found: resource limit argv[ 3 ]: 1024 default nonhyphen argument: 1024 argv[ 4 ]: -o case '-' found -o found: output file argv[ 5 ]: test_7_8 default nonhyphen argument: test_7_8 argv[ 6 ]: chapter7doc default nonhyphen argument: chapter7doc argv[ 7 ]: chapter8doc default nonhyphen argument: chapter8doc User-specifed limit: 1024 User-specified output file: test_7_8 Files to be processed are the following: chapter7doc chapter8doc
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A Command Line Class The details of processing the command line options are best encapsulated so that we don't clutter main() One encapsulation strategy, of course, is to provide a function For example:
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extern int parse_options( int arg_count, char **arg_vector ); int main( int argc, char *argv[] ) { // int option_status; option_status = parse_options( argc, argv ); // }
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The design question is how to return the set of values passed by the user Typically, these values are defined as global objects and are not passed into or back from the function Alternatively, we can encapsulate the processing within a class The data members of the class are the objects representing the potential values to be set by the user A set of public inline member functions provides access to these values The constructor initializes these values to their default setting A member function takes argc and argv as arguments and provides the handling of the options:
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#include <vector> #include <string> class CommandOpt { public: CommandOpt() : _limit( -1 ), _debug_on( false ) {} int parse_options( int argc, char *argv[] ); string out_file() { return _out_file; } bool debug_on() { return _debug_on; } int files() { return _file_namessize(); } // to access _file_names string& operator[]( int ix ); private: inline int usage( int exit_value = 0 ); bool _debug_on; int _limit; string _out_file; vector<string, allocator> _file_names; static const char *const program_name; static const char *const program_version; };
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Here is our revised main():1">[1]
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