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(* CmdArgs.mod provides procedures to retrieve arguments from strings.
Copyright (C) 2001-2025 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
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
<http://www.gnu.org/licenses/>. *)
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 (CmdIndex<HighC) AND Space(CmdLine[CmdIndex]) DO
INC(CmdIndex)
END ;
IF CmdIndex<HighC
THEN
IF SingleQuote(CmdLine[CmdIndex])
THEN
(* Skip over the single quote *)
INC(CmdIndex) ;
CopyUntil(CmdLine, CmdIndex, HighC, Arg, ArgIndex, HighA, squote) ;
INC(CmdIndex)
ELSIF DoubleQuote(CmdLine[CmdIndex])
THEN
(* Skip over the double quote *)
INC(CmdIndex) ;
CopyUntil(CmdLine, CmdIndex, HighC, Arg, ArgIndex, HighA, dquote) ;
INC(CmdIndex)
ELSE
CopyUntilSpace(CmdLine, CmdIndex, HighC, Arg, ArgIndex, HighA)
END
END ;
(* Skip spaces *)
WHILE (CmdIndex<HighC) AND Space(CmdLine[CmdIndex]) DO
INC(CmdIndex)
END ;
IF ArgIndex<HighA
THEN
Arg[ArgIndex] := nul
END ;
RETURN( (CmdIndex<HighC) )
END GetNextArg ;
(*
CopyUntilSpace - copies characters until a Space character is found.
*)
PROCEDURE CopyUntilSpace (From: ARRAY OF CHAR;
VAR FromIndex: CARDINAL; FromHigh: CARDINAL;
VAR To: ARRAY OF CHAR;
VAR ToIndex: CARDINAL; ToHigh: CARDINAL) ;
BEGIN
WHILE (FromIndex<FromHigh) AND (ToIndex<ToHigh) AND
(NOT Space(From[FromIndex])) DO
CopyChar(From, FromIndex, FromHigh, To, ToIndex, ToHigh)
END
END CopyUntilSpace ;
(*
CopyUntil - copies characters until the UntilChar is found.
*)
PROCEDURE CopyUntil (From: ARRAY OF CHAR;
VAR FromIndex: CARDINAL; FromHigh: CARDINAL;
VAR To: ARRAY OF CHAR;
VAR ToIndex: CARDINAL; ToHigh: CARDINAL;
UntilChar: CHAR) ;
BEGIN
WHILE (FromIndex<FromHigh) AND (ToIndex<ToHigh) AND
(From[FromIndex]#UntilChar) DO
CopyChar(From, FromIndex, FromHigh, To, ToIndex, ToHigh)
END
END CopyUntil ;
(*
CopyChar - copies a character from string From to string To and
takes into consideration escape characters. ie \x
Where x is any character.
*)
PROCEDURE CopyChar (From: ARRAY OF CHAR;
VAR FromIndex: CARDINAL; FromHigh: CARDINAL;
VAR To: ARRAY OF CHAR;
VAR ToIndex: CARDINAL; ToHigh: CARDINAL) ;
BEGIN
IF (FromIndex<FromHigh) AND (ToIndex<ToHigh)
THEN
IF Escape(From[FromIndex])
THEN
(* Skip over Escape Character *)
INC(FromIndex)
END ;
IF FromIndex<FromHigh
THEN
(* Copy Normal Character *)
To[ToIndex] := From[FromIndex] ;
INC(ToIndex) ;
INC(FromIndex)
END
END
END CopyChar ;
(*
Narg - returns the number of arguments available from
command line, CmdLine.
*)
PROCEDURE Narg (CmdLine: ARRAY OF CHAR) : CARDINAL ;
VAR
a : ARRAY [0..1000] OF CHAR ;
ArgNo: CARDINAL ;
BEGIN
ArgNo := 0 ;
WHILE GetArg(CmdLine, ArgNo, a) DO
INC( ArgNo )
END ;
(*
IF ArgNo>0
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.
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