(* CmdArgs.mod provides procedures to retrieve arguments from strings. Copyright (C) 2001-2024 Free Software Foundation, Inc. Contributed by Gaius Mulley . This file is part of GNU Modula-2. GNU Modula-2 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, or (at your option) any later version. GNU Modula-2 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. Under Section 7 of GPL version 3, you are granted additional permissions described in the GCC Runtime Library Exception, version 3.1, as published by the Free Software Foundation. You should have received a copy of the GNU General Public License and a copy of the GCC Runtime Library Exception along with this program; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see . *) IMPLEMENTATION MODULE CmdArgs ; FROM ASCII IMPORT cr, nul ; FROM StrLib IMPORT StrLen ; CONST esc = '\' ; space = ' ' ; squote = "'" ; dquote = '"' ; tab = ' ' ; (* GetArg - takes a command line and attempts to extract argument, n, from CmdLine. The resulting argument is placed into, a. The result of the operation is returned. *) PROCEDURE GetArg (CmdLine: ARRAY OF CHAR ; n: CARDINAL; VAR Argi: ARRAY OF CHAR) : BOOLEAN ; VAR Index, i : CARDINAL ; Another: BOOLEAN ; BEGIN Index := 0 ; (* Continually retrieve an argument until we get the n th argument. *) i := 0 ; REPEAT Another := GetNextArg(CmdLine, Index, Argi) ; INC(i) ; UNTIL (i>n) OR (NOT Another) ; RETURN( i>n ) END GetArg ; (* GetNextArg - Returns true if another argument may be found. The argument is taken from CmdLine at position Index, Arg is filled with the found argument. *) PROCEDURE GetNextArg (CmdLine: ARRAY OF CHAR; VAR CmdIndex: CARDINAL; VAR Arg: ARRAY OF CHAR) : BOOLEAN ; VAR ArgIndex: CARDINAL ; (* Index into Arg *) HighA, HighC: CARDINAL ; BEGIN HighA := HIGH(Arg) ; HighC := StrLen(CmdLine) ; ArgIndex := 0 ; (* Skip spaces *) WHILE (CmdIndex0 THEN DEC(ArgNo) END ; *) RETURN( ArgNo ) END Narg ; PROCEDURE Escape (ch: CHAR) : BOOLEAN ; BEGIN RETURN( ch=esc ) END Escape ; PROCEDURE Space (ch: CHAR) : BOOLEAN ; BEGIN RETURN( (ch=space) OR (ch=tab) ) END Space ; PROCEDURE DoubleQuote (ch: CHAR) : BOOLEAN ; BEGIN RETURN( ch=dquote ) END DoubleQuote ; PROCEDURE SingleQuote (ch: CHAR) : BOOLEAN ; BEGIN RETURN( ch=squote ) END SingleQuote ; END CmdArgs.