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pastools.pas
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Pascal/Delphi Source File
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1994-03-05
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5KB
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189 lines
20-Mar-84 20:48:17-PST,5273;000000000001
Return-Path: <b-davis@utah-cs>
Received: FROM utah-cs BY USC-ISIB.ARPA WITH TCP ; 20 Mar 84 20:46:17 PST
Received: by utah-cs.ARPA (4.19/3.33.3)
id AA24179; Tue, 20 Mar 84 21:40:08 mst
Date: Tue, 20 Mar 84 21:40:08 mst
From: b-davis@utah-cs (Brad Davis)
Message-Id: <8403210440.AA24179@utah-cs.ARPA>
To: info-ibmpc@usc-isib
Subject: New Tools for MS-Pascal
I have three routines that the readers might be interested in.
ENV (const s1: lstring; var s2: lstring);
Returns the value of s1 from the current
enviroment. See the SET command. If
s1 were COMSPEC then s2 probably would be
C:\COMMAND.COM for an XT.
ARGC : integer;
Returns the count of the parameters on the
command line. Counts the program name as
one of the parameters, e.g. C>FOO BAR would
return 2.
ARGV (i: integer; var s: lstring);
I is the position of the parameter to return.
In the example above ARGV(1,s) would return
BAR in s. Since MS-DOS doesn't give the
program name like UNIX, ARGV(0,s) would give
the null string in s.
ARGC and ARGV match the Berkely Pascal conventions for the same
named pre-declared routines. They also match the C conventions
for the parameters to main().
All you need to do to use them is to declare them external in
your program and link them to your program. If you have any
questions just write.
Brad Davis
P.S. Sorry if the code is cryptic. I usually don't spend time
commenting my hacks. I will answer any questions anyone
might have.
------------------------------------------------------------------------
{$DEBUG-}
INTERFACE;
UNIT
command_line(argc,argv,env);
function argc: integer;
procedure argv(num: integer; var s: lstring);
procedure env(var inps,outs: lstring);
END;
IMPLEMENTATION OF command_line;
CONST
CR = chr(13);
PARAM = #80;
ENVOFF = #2C;
TYPE
smallstring = lstring(40);
alphaarray = super array[0..*] of smallstring;
VAR
doparse: boolean;
doenv: boolean;
parsecnt: integer;
envcnt: integer;
arguments: ^alphaarray;
environment: ^alphaarray;
CESXQQ [EXTERN]: WORD;
VALUE
doparse := true;
doenv:= true;
procedure parsecommand;
var
i,j,k: integer;
doskip: boolean;
a: ads of lstring(255);
begin
doparse := false;
a.s := CESXQQ;
a.r := PARAM;
parsecnt := 1;
i := 1;
while i <= (ord(a^.len)) do begin
while a^[i] = ' ' do i := i + 1;
parsecnt := parsecnt + 1;
while (a^[i] <> ' ') and (a^[i] <> CR) do i := i + 1;
end;
new(arguments,parsecnt-1);
i := 1;
arguments^[0] := null; { MS-DOS doesn't give us the program name }
j := 0;
while i <= (ord(a^.len)) do begin
while a^[i] = ' ' do i := i + 1;
j := j + 1;
k := 1;
while (a^[i] <> ' ') and (a^[i] <> CR) do begin
arguments^[j][k] := a^[i];
i := i + 1;
k := k + 1;
end;
arguments^[j].len := wrd(k-1);
end;
end;
procedure getenvironment;
var
i,j,k: integer;
a: adsmem;
offset: ads of word;
begin
doenv := false;
offset.s := CESXQQ;
offset.r := ENVOFF;
a.s := offset^;
a.r := 0;
i := 0;
envcnt := 0;
while a^[wrd(i)] <> 0 do begin
envcnt := envcnt + 1;
while a^[wrd(i)] <> 0 do i := i + 1;
i := i + 1;
end;
new(environment,envcnt);
i := 0;
j := 0;
while a^[wrd(i)] <> 0 do begin
k := 1;
while a^[wrd(i)] <> 0 do begin
environment^[j][k] := chr(a^[wrd(i)]);
i := i + 1;
k := k + 1;
end;
environment^[j].len := wrd(k-1);
j := j + 1;
i := i + 1;
end;
end;
function argc{: integer};
begin
if doparse then parsecommand;
argc := parsecnt;
end;
procedure argv{num: integer; var s: lstring};
begin
if doparse then parsecommand;
if num < parsecnt then
movel(adr arguments^[num],adr s,arguments^[num].len+1)
else
s.len := 0;
end;
procedure env{var inps,outs: lstring};
var
i,j: integer;
s1,s2: lstring(255);
begin
if doenv then getenvironment;
for i := 1 to ord(inps.len) do
if (inps[i] >= 'a') and (inps[i] <= 'z') then
s1[i] := chr(ord(inps[i]) - ord('a') + ord('A'))
else
s1[i] := inps[i];
s1.len := inps.len;
outs.len := 0;
for i := 0 to envcnt-1 do begin
s2 := environment^[i];
j := positn('=',s2,1);
delete(s2,j,ord(s2.len)-j+1);
if s2 = s1 then begin
movel(adr environment^[i],adr outs,environment^[i].len+1);
delete(outs,1,j);
end;
end;
end;
END.