The World of Computer Software/The World of Computer Software.iso/faq-s.zip/GENERAL.PAS

Pascal/Delphi Source File | 1991-01-06 | 6KB | 298 lines

unit general;

interface

uses dos,types;

function strr (n:integer):mstr;
function streal (r:real):mstr;
function strlong (l:longint):mstr;
function valu (q:mstr):integer;
function valul (q:mstr):longint;
function addrstr (p:pointer):sstr;
procedure parse3 (s:lstr; var a,b,c:word);
function packtime (var dt:datetime):longint;
function now:longint;
function timestr (time:longint):sstr;
function timeval (opps:sstr):longint;
function timepart (time:longint):longint;
function datestr (time:longint):sstr;
function dateval (q:sstr):longint;
function datepart (date:longint):longint;
function upstring (s:anystr):anystr;
function match (s1,s2:anystr):boolean;
function devicename (it:lstr):boolean;
function exist (te:lstr):boolean;
procedure appendfile (name:lstr; var q:text);
procedure addexitproc (p:pointer);
procedure doneexitproc;

implementation

const maxexitprocs=25;

var exitstack:array [1..maxexitprocs] of pointer;
    exitstackptr:integer;

type packedtimerec=record
       date,time:word
     end;

function strr (n:integer):mstr;
var q:mstr;
begin
  str (n,q);
  strr:=q
end;

function streal (r:real):mstr;
var q:mstr;
begin
  str (r:0:0,q);
  streal:=q
end;

function strlong (l:longint):mstr;
var v:mstr;
begin
  str (l,v);
  strlong:=v
end;

function valu (q:mstr):integer;
var i,s,pu:integer;
    r:real;
begin
  valu:=0;
  if length(q)=0 then exit;
  if not (q[1] in ['0'..'9','-']) then exit;
  if length(q)>5 then exit;
  val (q,r,s);
  if s<>0 then exit;
  if (r<=32767.0) and (r>=-32767.0)
    then valu:=round(r)
end;

function valul (q:mstr):longint;
var i,s,pu:integer;
    r:real;
begin
  valul:=0;
  if length(q)=0 then exit;
  if not (q[1] in ['0'..'9','-']) then exit;
  if pos(' ',q)<>0 then q:=copy(q,1,pos(' ',q)-1);
  val (q,r,s);
  if s<>0 then exit;
  valul:=round(r)
end;

function addrstr (p:pointer):sstr;

  function hexstr (n:integer):sstr;

    function hexbytestr (b:byte):sstr;
    const hexchars:array[0..15] of char='0123456789ABCDEF';
    begin
      hexbytestr:=hexchars[b shr 4]+hexchars[b and 15]
    end;

  begin
    hexstr:=hexbytestr (hi(n))+hexbytestr(lo(n))
  end;

begin
  addrstr:=hexstr(seg(p^))+':'+hexstr(ofs(p^))
end;

procedure parse3 (s:lstr; var a,b,c:word);
var p:integer;

  procedure parse1 (var n:word);
  var ns:lstr;
  begin
    ns[0]:=#0;
    while (p<=length(s)) and (s[p] in ['0'..'9']) do begin
      ns:=ns+s[p];
      p:=p+1
    end;
    if length(ns)=0
      then n:=0
      else n:=valu(ns);
    if p<length(s) then p:=p+1
  end;

begin
  p:=1;
  parse1 (a);
  parse1 (b);
  parse1 (c)
end;

function packtime (var dt:datetime):longint;
var l:longint;
begin
  dos.packtime (dt,l);
  packtime:=l
end;

function now:longint;
var dt:datetime;
    t:word;
    l:longint;
begin
  gettime (dt.hour,dt.min,dt.sec,t);
  getdate (dt.year,dt.month,dt.day,t);
  l:=packtime (dt);
  now:=l
end;

function timestr (time:longint):sstr;
var h1:integer;
    ms:sstr;
    dt:datetime;
const ampmstr:array [false..true] of string[2]=('am','pm');
begin
  unpacktime (time,dt);
  h1:=dt.hour;
  if h1=0
    then h1:=12
    else if h1>12
      then h1:=h1-12;
  ms:=strr(dt.min);
  if dt.min<10 then ms:='0'+ms;
  timestr:=strr(h1)+':'+ms+' '+ampmstr[dt.hour>11]
end;

function datestr (time:longint):sstr;
var dt:datetime;
begin
  unpacktime (time,dt);
  datestr:=strr(dt.month)+'/'+strr(dt.day)+'/'+strr(dt.year-1900)
end;

function timepart (time:longint):longint;
begin
  timepart:=time and $0000ffff;
end;

function datepart (date:longint):longint;
begin
  datepart:=date and $ffff0000;
end;

procedure cleardatetime (var dt:datetime);
begin
  unpacktime (0,dt)
end;

function timeval (opps:sstr):longint;
var h1,t:word;
    k:char;
    dt:datetime;
begin
  cleardatetime (dt);
  parse3 (opps,h1,dt.min,t);
  k:=upcase(opps[length(opps)-1]);
  if h1 in [1..11] then begin
     dt.hour:=h1;
     if k='P' then dt.hour:=dt.hour+12
  end else if k='P'
   then dt.hour:=12
  else dt.hour:=0;
  timeval:=timepart(packtime(dt))
end;

function dateval (q:sstr):longint;
var dt:datetime;
begin
  cleardatetime (dt);
  parse3 (q,dt.month,dt.day,dt.year);
  if ((dt.year<100) and (dt.year>00)) then dt.year:=dt.year+1900;
  dateval:=datepart(packtime(dt))
end;

function upstring (s:anystr):anystr;
var cnt:integer;
begin
  for cnt:=1 to length(s) do s[cnt]:=upcase(s[cnt]);
  upstring:=s
end;

function match (s1,s2:anystr):boolean;
var cnt:integer;
begin
  match:=false;
  if length(s1)<>length(s2) then exit;
  for cnt:=1 to length(s1) do
    if upcase(s1[cnt])<>upcase(s2[cnt]) then exit;
  match:=true
end;

function devicename (it:lstr):boolean;
var f:file;
    n:integer absolute f;
    r:registers;
begin
  devicename:=false;
  assign (f,it);
  reset (f);
  if ioresult<>0 then exit;
  r.bx:=n;
  r.ax:=$4400;
  intr ($21,r);
  devicename:=(r.dx and 128)=128;
  close (f)
end;

function exist (te:lstr):boolean;
var f:file;
    i:integer;
begin
  assign (f,te);
  reset (f);
  i:=ioresult;
  exist:=i=0;
  close (f);
  i:=ioresult
end;

procedure appendfile (name:lstr; var q:text);
var n:integer;
    b:boolean;
    f:file of char;
begin
  close (q);
  n:=ioresult;
  assign (q,name);
  assign (f,name);
  reset (f);
  b:=(ioresult<>0) or (filesize(f)=0);
  close (f);
  n:=ioresult;
  if b
    then rewrite (q)
    else append (q)
end;

procedure addexitproc (p:pointer);
begin
  inc (exitstackptr);
  if exitstackptr>maxexitprocs then begin
    writeln ('Too many exit procedures');
    halt (255)
  end else begin
    exitstack[exitstackptr]:=exitproc;
    exitproc:=p
  end
end;

procedure doneexitproc;
begin
  exitproc:=exitstack[exitstackptr];
  dec (exitstackptr)
end;

begin
  exitstackptr:=0
end.