kolibrios/programs/develop/oberon07/Lib/KolibriOS/Args.ob07

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(*
Copyright 2016 Anton Krotov
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*)
MODULE Args;
IMPORT sys := SYSTEM, KOSAPI;
CONST
MAX_PARAM = 1024;
VAR
Params: ARRAY MAX_PARAM, 2 OF INTEGER;
argc*: INTEGER;
PROCEDURE GetChar(adr: INTEGER): CHAR;
VAR res: CHAR;
BEGIN
sys.GET(adr, res)
RETURN res
END GetChar;
PROCEDURE ParamParse;
VAR p, count, name: INTEGER; c: CHAR; cond: INTEGER;
PROCEDURE ChangeCond(A, B, C: INTEGER);
BEGIN
IF (c <= 20X) & (c # 0X) THEN
cond := A
ELSIF c = 22X THEN
cond := B
ELSIF c = 0X THEN
cond := 6
ELSE
cond := C
END
END ChangeCond;
BEGIN
p := KOSAPI.GetCommandLine();
name := KOSAPI.GetName();
Params[0, 0] := name;
WHILE GetChar(name) # 0X DO
INC(name)
END;
Params[0, 1] := name - 1;
cond := 0;
count := 1;
WHILE (argc < MAX_PARAM) & (cond # 6) DO
c := GetChar(p);
CASE cond OF
|0: ChangeCond(0, 4, 1); IF cond = 1 THEN Params[count, 0] := p END
|1: ChangeCond(0, 3, 1); IF cond IN {0, 6} THEN Params[count, 1] := p - 1; INC(count) END
|3: ChangeCond(3, 1, 3); IF cond = 6 THEN Params[count, 1] := p - 1; INC(count) END
|4: ChangeCond(5, 0, 5); IF cond = 5 THEN Params[count, 0] := p END
|5: ChangeCond(5, 1, 5); IF cond = 6 THEN Params[count, 1] := p - 1; INC(count) END
ELSE
END;
INC(p)
END;
argc := count
END ParamParse;
PROCEDURE GetArg*(n: INTEGER; VAR s: ARRAY OF CHAR);
VAR i, j, len: INTEGER; c: CHAR;
BEGIN
j := 0;
IF n < argc + 1 THEN
len := LEN(s) - 1;
i := Params[n, 0];
WHILE (j < len) & (i <= Params[n, 1]) DO
c := GetChar(i);
IF c # 22X THEN
s[j] := c;
INC(j)
END;
INC(i);
END;
END;
s[j] := 0X
END GetArg;
BEGIN
ParamParse
END Args.