/*
===========================================================================

Doom 3 GPL Source Code
Copyright (C) 1999-2011 id Software LLC, a ZeniMax Media company.

This file is part of the Doom 3 GPL Source Code ("Doom 3 Source Code").

Doom 3 Source Code 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.

Doom 3 Source Code 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 Doom 3 Source Code.  If not, see <http://www.gnu.org/licenses/>.

In addition, the Doom 3 Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 Source Code.  If not, please request a copy in writing from id Software at the address below.

If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.

===========================================================================
*/

#include "sys/platform.h"
#include "idlib/Lexer.h"
#include "idlib/Lib.h"
#include "framework/CVarSystem.h"

#include "idlib/CmdArgs.h"

/*
============
idCmdArgs::operator=
============
*/
void idCmdArgs::operator=( const idCmdArgs &args ) {
	int i;

	argc = args.argc;
	memcpy( tokenized, args.tokenized, MAX_COMMAND_STRING );
	for ( i = 0; i < argc; i++ ) {
		argv[ i ] = tokenized + ( args.argv[ i ] - args.tokenized );
	}
}

/*
============
idCmdArgs::Args
============
*/
const char *idCmdArgs::Args(  int start, int end, bool escapeArgs ) const {
	static char cmd_args[MAX_COMMAND_STRING];
	int		i;

	if ( end < 0 ) {
		end = argc - 1;
	} else if ( end >= argc ) {
		end = argc - 1;
	}
	cmd_args[0] = '\0';
	if ( escapeArgs ) {
		strcat( cmd_args, "\"" );
	}
	for ( i = start; i <= end; i++ ) {
		if ( i > start ) {
			if ( escapeArgs ) {
				strcat( cmd_args, "\" \"" );
			} else {
				strcat( cmd_args, " " );
			}
		}
		if ( escapeArgs && strchr( argv[i], '\\' ) ) {
			char *p = argv[i];
			while ( *p != '\0' ) {
				if ( *p == '\\' ) {
					strcat( cmd_args, "\\\\" );
				} else {
					int l = strlen( cmd_args );
					cmd_args[ l ] = *p;
					cmd_args[ l+1 ] = '\0';
				}
				p++;
			}
		} else {
			strcat( cmd_args, argv[i] );
		}
	}
	if ( escapeArgs ) {
		strcat( cmd_args, "\"" );
	}

	return cmd_args;
}

/*
============
idCmdArgs::TokenizeString

Parses the given string into command line tokens.
The text is copied to a separate buffer and 0 characters
are inserted in the appropriate place. The argv array
will point into this temporary buffer.
============
*/
void idCmdArgs::TokenizeString( const char *text, bool keepAsStrings ) {
	idLexer		lex;
	idToken		token, number;
	int			len, totalLen;

	// clear previous args
	argc = 0;

	if ( !text ) {
		return;
	}

	lex.LoadMemory( text, strlen( text ), "idCmdSystemLocal::TokenizeString" );
	lex.SetFlags( LEXFL_NOERRORS
				| LEXFL_NOWARNINGS
				| LEXFL_NOSTRINGCONCAT
				| LEXFL_ALLOWPATHNAMES
				| LEXFL_NOSTRINGESCAPECHARS
				| LEXFL_ALLOWIPADDRESSES | ( keepAsStrings ? LEXFL_ONLYSTRINGS : 0 ) );

	totalLen = 0;

	while ( 1 ) {
		if ( argc == MAX_COMMAND_ARGS ) {
			return;			// this is usually something malicious
		}

		if ( !lex.ReadToken( &token ) ) {
			return;
		}

		// check for negative numbers
		if ( !keepAsStrings && ( token == "-" ) ) {
			if ( lex.CheckTokenType( TT_NUMBER, 0, &number ) ) {
				token = "-" + number;
			}
		}

		// check for cvar expansion
		if ( token == "$" ) {
			if ( !lex.ReadToken( &token ) ) {
				return;
			}
			if ( idLib::cvarSystem ) {
				token = idLib::cvarSystem->GetCVarString( token.c_str() );
			} else {
				token = "<unknown>";
			}
		}

		len = token.Length();

		if ( totalLen + len + 1 > sizeof( tokenized ) ) {
			return;			// this is usually something malicious
		}

		// regular token
		argv[argc] = tokenized + totalLen;
		argc++;

		idStr::Copynz( tokenized + totalLen, token.c_str(), sizeof( tokenized ) - totalLen );

		totalLen += len + 1;
	}
}

/*
============
idCmdArgs::AppendArg
============
*/
void idCmdArgs::AppendArg( const char *text ) {
	if ( !argc ) {
		argc = 1;
		argv[ 0 ] = tokenized;
		idStr::Copynz( tokenized, text, sizeof( tokenized ) );
	} else {
		argv[ argc ] = argv[ argc-1 ] + strlen( argv[ argc-1 ] ) + 1;
		idStr::Copynz( argv[ argc ], text, sizeof( tokenized ) - ( argv[ argc ] - tokenized ) );
		argc++;
	}
}

/*
============
idCmdArgs::GetArgs
============
*/
const char **idCmdArgs::GetArgs( int *_argc ) {
	*_argc = argc;
	return (const char **)&argv[0];
}