home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
DP Tool Club 19
/
CD_ASCQ_19_010295.iso
/
dos
/
prg
/
pas
/
swag
/
strings.swg
/
0076_LONG String Arrays.pas
< prev
next >
Wrap
Pascal/Delphi Source File
|
1994-05-25
|
4KB
|
174 lines
{
GV> Hi Wim,
Hi Greg...
GV> It wouldn't be difficult to write Pos, Copy, Assign, etc., which
GV> operate on an ARRAY OF CHAR -- using the ASCIIZ scheme, or a length
GV> WORD (rather than length byte) at array elements [0] and [1].
As you can see in a other message has wim van der vegt written a
complete unit with these functions :-)
it was a 'little' bit reprogramming to implement these new functions but
it was worth while <g>
GV> Greg_
Thanx for your answer, Wim
here is the code :
}
Unit MyStr;
INTERFACE
Const
maxlength = 512;
nul = #00;
cr = #13;
lf = #10;
sp = #32;
Type
indexrange = 0..maxlength;
stringtype = Record
length : indexrange;
chars : Array[1..maxlength] Of char;
End;
Function Long_Length(s : stringtype) : indexrange;
Procedure Long_Readln(Var f : text;var l : stringtype);
Procedure Long_Write(Var f : text;var l : stringtype);
Procedure Long_Writeln(Var f : text;var l : stringtype);
Procedure Long_Copy(s : stringtype;Var d : stringtype; index,count : indexrange);
Procedure Long_Concat(Var d : stringtype;s : String);
IMPLEMENTATION
{---------------------------------------------------------}
{ Author : Ir. G.W. van der Vegt }
{ Project : Longer strings }
{ Source : Pascal + Data Structures by Dale/Lilly }
{ ISBN 0-669-07239-7 }
{---------------------------------------------------------}
{ Modified to give less errors and act more like TP's }
{ functions. Can be made more efficient by using move, }
{ moving the inc of length's out of the for loops and }
{ not using the Length function to calc the length but }
{ use the field in the record. etc. }
{---------------------------------------------------------}
{ Because Turbo Pascal's Functions won't return records }
{ most of the Turbo Pascal String functions equivalents }
{ can only be procedures. }
{---------------------------------------------------------}
{ The code hasn't been tested well yet so expect some }
{ errors to be in it. All I have detected are fixed. }
{ For testing set maxlength at 20 or 30. }
{---------------------------------------------------------}
Function Long_Length(s : stringtype) : indexrange;
Begin
Long_Length:=s.length;
End;
Procedure Long_Readln(Var f : text;var l : stringtype);
Begin
l.length:=0;
Fillchar(l.chars,maxlength,sp);
While NOT(Eoln(f) OR Eof(f)) AND (l.length<maxlength) Do
Begin
Inc(l.length,1);
System.Read(f,l.chars[l.length]);
End;
IF Not(eof(f)) Then System.readln(f);
End;
Procedure Long_Write(Var f : text;var l : stringtype);
Var
pos : indexrange;
Begin
For pos:=1 To Long_Length(l) DO
System.Write(f,l.chars[pos]);
End;
Procedure Long_Writeln(Var f : text;var l : stringtype);
Var
pos : indexrange;
Begin
For pos:=1 To Long_Length(l) DO
System.Write(f,l.chars[pos]);
System.Write(f,cr,lf);
End;
Procedure Long_Copy(s : stringtype;Var d : stringtype; index,count : indexrange);
Var
poss,
posd : indexrange;
Begin
d.length:=0;
Fillchar(d.chars,maxlength,sp);
posd:=0;
poss:=index;
WHILE (posd<count) AND (poss<=maxlength) Do
Begin
Inc(d.length,1);
Inc(posd,1);
d.chars[posd]:=s.chars[poss];
Inc(poss,1);
End;
End;
Procedure Long_Concat(Var d : stringtype;s : String);
Var
posd,
poss : indexrange;
Begin
posd:=Long_Length(d);
poss:=0;
While (posd<maxlength) AND (poss<Length(s)) Do
Begin
Inc(poss,1);
Inc(posd,1);
d.chars[posd]:=s[poss];
Inc(d.length,1);
End;
End;
(*
Var
inf : text;
s,d : stringtype;
Begin
Assign(inf,'LSTRING.PAS');
Reset(inf);
While NOT(eof(inf)) Do
Begin
Readln(inf,s);
Copy(s,d,1,4);
Writeln(output,s);
Writeln(output,d);
Concat(d,s);
Writeln(output,d);
End;
*)
End.