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{
$Id: strings.pp,v 1.2 1998/07/01 14:29:42 carl Exp $
This file is part of the Free Pascal run time library.
Copyright (c) 1997 by Carl-Eric Codere,
member of the Free Pascal development team.
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
**********************************************************************}
{
History:
Added StrAlloc.
12 Oct 1998
nils.sjoholm@mailbox.swipnet.se
}
Unit Strings;
{*********************************************************************}
{ Strings unit, 100% portable. }
{- COMPILING INFORMATION ---------------------------------------------}
{ The only difference between this unit and the one supplied with }
{ Turbo Pascal 7.01, are that StrLen returns a longint, and the }
{ routines requiring a length now use longints instead of words. }
{ This should not influence the behaviour of your programs under }
{ Turbo Pascal. (it will even create better error checking for your }
{ programs). }
{*********************************************************************}
Interface
{*********************************************************************}
{ Returns the number of Characters in Str,not counting the Null }
{ chracter. }
{*********************************************************************}
function StrLen(Str: PChar): longint;
function StrEnd(Str: PChar): PChar;
{*********************************************************************}
{ Description: Move count characters from source to dest. }
{ Do not forget to use StrLen(source)+1 as l parameter to also move }
{ the null character. }
{ Return value: Dest }
{ Remarks: Source and Dest may overlap. }
{*********************************************************************}
function StrMove(Dest,Source : Pchar;l : Longint) : pchar;
function StrCopy(Dest, Source: PChar): PChar;
{*********************************************************************}
{ Input: Source -> Source of the null-terminated string to copy. }
{ Dest -> Destination of null terminated string to copy. }
{ Return Value: Pointer to the end of the copied string of Dest. }
{ Output: Dest -> Pointer to the copied string. }
{*********************************************************************}
function StrECopy(Dest, Source: PChar): PChar;
{*********************************************************************}
{ Copies at most MaxLen characters from Source to Dest. }
{ }
{ Remarks: According to the Turbo Pascal programmer's Reference }
{ this routine performs length checking. From the code of the }
{ original strings unit, this does not seem true... }
{ Furthermore, copying a null string gives two null characters in }
{ the destination according to the Turbo Pascal routine. }
{*********************************************************************}
function StrLCopy(Dest, Source: PChar; MaxLen: Longint): PChar;
{*********************************************************************}
{ Input: Source -> Source of the pascal style string to copy. }
{ Dest -> Destination of null terminated string to copy. }
{ Return Value: Dest. (with noew copied string) }
{*********************************************************************}
function StrPCopy(Dest: PChar; Source: String): PChar;
{*********************************************************************}
{ Description: Appends a copy of Source to then end of Dest and }
{ return Dest. }
{*********************************************************************}
function StrCat(Dest, Source: PChar): PChar;
{*********************************************************************}
{ Description: Appends at most MaxLen - StrLen(Dest) characters from }
{ Source to the end of Dest, and returns Dest. }
{*********************************************************************}
function strlcat(dest,source : pchar;l : Longint) : pchar;
{*********************************************************************}
{ Compares two strings. Does the ASCII value substraction of the }
{ first non matching characters }
{ Returns 0 if both strings are equal }
{ Returns < 0 if Str1 < Str2 }
{ Returns > 0 if Str1 > Str2 }
{*********************************************************************}
function StrComp(Str1, Str2: PChar): Integer;
{*********************************************************************}
{ Compares two strings without case sensitivity. See StrComp for more}
{ information. }
{ Returns 0 if both strings are equal }
{ Returns < 0 if Str1 < Str2 }
{ Returns > 0 if Str1 > Str2 }
{*********************************************************************}
function StrIComp(Str1, Str2: PChar): Integer;
{*********************************************************************}
{ Compares two strings up to a maximum of MaxLen characters. }
{ }
{ Returns 0 if both strings are equal }
{ Returns < 0 if Str1 < Str2 }
{ Returns > 0 if Str1 > Str2 }
{*********************************************************************}
function StrLComp(Str1, Str2: PChar; MaxLen: Longint): Integer;
{*********************************************************************}
{ Compares two strings up to a maximum of MaxLen characters. }
{ The comparison is case insensitive. }
{ Returns 0 if both strings are equal }
{ Returns < 0 if Str1 < Str2 }
{ Returns > 0 if Str1 > Str2 }
{*********************************************************************}
function StrLIComp(Str1, Str2: PChar; MaxLen: Longint): Integer;
{*********************************************************************}
{ Input: Str -> String to search. }
{ Ch -> Character to find in Str. }
{ Return Value: Pointer to first occurence of Ch in Str, nil if }
{ not found. }
{ Remark: The null terminator is considered being part of the string }
{*********************************************************************}
function StrScan(Str: PChar; Ch: Char): PChar;
{*********************************************************************}
{ Input: Str -> String to search. }
{ Ch -> Character to find in Str. }
{ Return Value: Pointer to last occurence of Ch in Str, nil if }
{ not found. }
{ Remark: The null terminator is considered being part of the string }
{*********************************************************************}
function StrRScan(Str: PChar; Ch: Char): PChar;
{*********************************************************************}
{ Input: Str1 -> String to search. }
{ Str2 -> String to match in Str1. }
{ Return Value: Pointer to first occurence of Str2 in Str1, nil if }
{ not found. }
{*********************************************************************}
function StrPos(Str1, Str2: PChar): PChar;
{*********************************************************************}
{ Input: Str -> null terminated string to uppercase. }
{ Output:Str -> null terminated string in upper case characters. }
{ Return Value: null terminated string in upper case characters. }
{ Remarks: Case conversion is dependant on upcase routine. }
{*********************************************************************}
function StrUpper(Str: PChar): PChar;
{*********************************************************************}
{ Input: Str -> null terminated string to lower case. }
{ Output:Str -> null terminated string in lower case characters. }
{ Return Value: null terminated string in lower case characters. }
{ Remarks: Only converts standard ASCII characters. }
{*********************************************************************}
function StrLower(Str: PChar): PChar;
{ StrPas converts Str to a Pascal style string. }
function StrPas(Str: PChar): String;
{*********************************************************************}
{ Input: Str -> String to duplicate. }
{ Return Value: Pointer to the new allocated string. nil if no }
{ string allocated. If Str = nil then return value }
{ will also be nil (in this case, no allocation }
{ occurs). The size allocated is of StrLen(Str)+1 }
{ bytes. }
{*********************************************************************}
function StrNew(P: PChar): PChar;
{ StrDispose disposes a string that was previously allocated }
{ with StrNew. If Str is NIL, StrDispose does nothing. }
procedure StrDispose(P: PChar);
function StrAlloc(l : longint): PChar;
Implementation
function strlen(Str : pchar) : Longint;
var
counter : Longint;
Begin
counter := 0;
while Str[counter] <> #0 do
Inc(counter);
strlen := counter;
end;
Function strpas(Str: pchar): string;
{ only 255 first characters are actually copied. }
var
counter : byte;
lstr: string;
Begin
counter := 0;
lstr := '';
while (ord(Str[counter]) <> 0) and (counter < 255) do
begin
Inc(counter);
lstr[counter] := char(Str[counter-1]);
end;
lstr[0] := char(counter);
strpas := lstr;
end;
Function StrEnd(Str: PChar): PChar;
var
counter: Longint;
begin
counter := 0;
while Str[counter] <> #0 do
Inc(counter);
StrEnd := @(Str[Counter]);
end;
Function StrCopy(Dest, Source:PChar): PChar;
var
counter : Longint;
Begin
counter := 0;
while Source[counter] <> #0 do
begin
Dest[counter] := char(Source[counter]);
Inc(counter);
end;
{ terminate the string }
Dest[counter] := #0;
StrCopy := Dest;
end;
function StrCat(Dest,Source: PChar): PChar;
var
counter: Longint;
PEnd: PChar;
begin
PEnd := StrEnd(Dest);
counter := 0;
while (Source[counter] <> #0) do
begin
PEnd[counter] := char(Source[counter]);
Inc(counter);
end;
{ terminate the string }
PEnd[counter] := #0;
StrCat := Dest;
end;
function StrUpper(Str: PChar): PChar;
var
counter: Longint;
begin
counter := 0;
while (Str[counter] <> #0) do
begin
if Str[Counter] in [#97..#122,#128..#255] then
Str[counter] := Upcase(Str[counter]);
Inc(counter);
end;
StrUpper := Str;
end;
function StrLower(Str: PChar): PChar;
var
counter: Longint;
begin
counter := 0;
while (Str[counter] <> #0) do
begin
if Str[counter] in [#65..#90] then
Str[Counter] := chr(ord(Str[Counter]) + 32);
Inc(counter);
end;
StrLower := Str;
end;
function StrPos(Str1,Str2: PChar): PChar;
var
count: Longint;
oldindex: Longint;
found: boolean;
Str1Length: Longint;
Str2Length: Longint;
ll: Longint;
Begin
Str1Length := StrLen(Str1);
Str2Length := StrLen(Str2);
found := true;
oldindex := 0;
{ If the search string is greater than the string to be searched }
{ it is certain that we will not find it. }
{ Furthermore looking for a null will simply give out a pointer, }
{ to the null character of str1 as in Borland Pascal. }
if (Str2Length > Str1Length) or (Str2[0] = #0) then
begin
StrPos := nil;
exit;
end;
Repeat
{ Find first matching character of Str2 in Str1 }
{ put index of this character in oldindex }
for count:= oldindex to Str1Length-1 do
begin
if Str2[0] = Str1[count] then
begin
oldindex := count;
break;
end;
{ nothing found - exit routine }
if count = Str1Length-1 then
begin
StrPos := nil;
exit;
end;
end;
found := true;
{ Compare the character strings }
{ and check if they match. }
for ll := 0 to Str2Length-1 do
begin
{ no match, stop iteration }
if (Str2[ll] <> Str1[ll+oldindex]) then
begin
found := false;
break;
end;
end;
{ Not found, the index will no point at next character }
if not found then
Inc(oldindex);
{ There was a match }
if found then
begin
StrPos := @(Str1[oldindex]);
exit;
end;
{ If we have gone through the whole string to search }
{ then exit routine. }
Until (Str1Length-oldindex) <= 0;
StrPos := nil;
end;
function StrScan(Str: PChar; Ch: Char): PChar;
Var
count: Longint;
Begin
count := 0;
{ As in Borland Pascal , if looking for NULL return null }
if ch = #0 then
begin
StrScan := @(Str[StrLen(Str)]);
exit;
end;
{ Find first matching character of Ch in Str }
while Str[count] <> #0 do
begin
if Ch = Str[count] then
begin
StrScan := @(Str[count]);
exit;
end;
Inc(count);
end;
{ nothing found. }
StrScan := nil;
end;
function StrRScan(Str: PChar; Ch: Char): PChar;
Var
count: Longint;
index: Longint;
Begin
count := Strlen(Str);
{ As in Borland Pascal , if looking for NULL return null }
if ch = #0 then
begin
StrRScan := @(Str[count]);
exit;
end;
Dec(count);
for index := count downto 0 do
begin
if Ch = Str[index] then
begin
StrRScan := @(Str[index]);
exit;
end;
end;
{ nothing found. }
StrRScan := nil;
end;
function StrNew(p:PChar): PChar;
var
len : Longint;
tmp : pchar;
begin
strnew:=nil;
if (p=nil) or (p^=#0) then
exit;
len:=strlen(p)+1;
getmem(tmp,len);
if tmp<>nil then
strmove(tmp,p,len);
StrNew := tmp;
end;
Function StrECopy(Dest, Source: PChar): PChar;
{ Equivalent to the following: }
{ strcopy(Dest,Source); }
{ StrECopy := StrEnd(Dest); }
var
counter : Longint;
Begin
counter := 0;
while Source[counter] <> #0 do
begin
Dest[counter] := char(Source[counter]);
Inc(counter);
end;
{ terminate the string }
Dest[counter] := #0;
StrECopy:=@(Dest[counter]);
end;
Function StrPCopy(Dest: PChar; Source: String):PChar;
var
counter : byte;
Begin
counter := 0;
{ if empty pascal string }
{ then setup and exit now }
if Source = '' then
Begin
Dest[0] := #0;
StrPCopy := Dest;
exit;
end;
for counter:=1 to length(Source) do
begin
Dest[counter-1] := Source[counter];
end;
{ terminate the string }
Dest[counter] := #0;
StrPCopy:=Dest;
end;
procedure strdispose(p : pchar);
begin
if p<>nil then
freemem(p,strlen(p)+1);
end;
function stralloc(l : longint): pchar;
var
p : pchar;
begin
getmem(p,l);
stralloc := p;
end;
function strmove(dest,source : pchar;l : Longint) : pchar;
begin
move(source^,dest^,l);
strmove:=dest;
end;
function strlcat(dest,source : pchar;l : Longint) : pchar;
var
destend : pchar;
begin
destend:=strend(dest);
l:=l-(destend-dest);
strlcat:=strlcopy(destend,source,l);
end;
Function StrLCopy(Dest,Source: PChar; MaxLen: Longint): PChar;
var
counter: Longint;
Begin
counter := 0;
{ To be compatible with BP, on a null string, put two nulls }
If Source[0] = #0 then
Begin
Dest[0]:=Source[0];
Inc(counter);
end;
while (Source[counter] <> #0) and (counter < MaxLen) do
Begin
Dest[counter] := char(Source[counter]);
Inc(counter);
end;
{ terminate the string }
Dest[counter] := #0;
StrLCopy := Dest;
end;
function StrComp(Str1, Str2 : PChar): Integer;
var
counter: Longint;
Begin
counter := 0;
While str1[counter] = str2[counter] do
Begin
if (str2[counter] = #0) or (str1[counter] = #0) then
break;
Inc(counter);
end;
StrComp := ord(str1[counter]) - ord(str2[counter]);
end;
function StrIComp(Str1, Str2 : PChar): Integer;
var
counter: Longint;
c1, c2: char;
Begin
counter := 0;
c1 := upcase(str1[counter]);
c2 := upcase(str2[counter]);
While c1 = c2 do
Begin
if (c1 = #0) or (c2 = #0) then break;
Inc(counter);
c1 := upcase(str1[counter]);
c2 := upcase(str2[counter]);
end;
StrIComp := ord(c1) - ord(c2);
end;
function StrLComp(Str1, Str2 : PChar; MaxLen: Longint): Integer;
var
counter: Longint;
c1, c2: char;
Begin
counter := 0;
if MaxLen = 0 then
begin
StrLComp := 0;
exit;
end;
Repeat
if (c1 = #0) or (c2 = #0) then break;
c1 := str1[counter];
c2 := str2[counter];
Inc(counter);
Until (c1 <> c2) or (counter >= MaxLen);
StrLComp := ord(c1) - ord(c2);
end;
function StrLIComp(Str1, Str2 : PChar; MaxLen: Longint): Integer;
var
counter: Longint;
c1, c2: char;
Begin
counter := 0;
if MaxLen = 0 then
begin
StrLIComp := 0;
exit;
end;
Repeat
if (c1 = #0) or (c2 = #0) then break;
c1 := upcase(str1[counter]);
c2 := upcase(str2[counter]);
Inc(counter);
Until (c1 <> c2) or (counter >= MaxLen);
StrLIComp := ord(c1) - ord(c2);
end;
end.
{
$Log: strings.pp,v $
Revision 1.2 1998/07/01 14:29:42 carl
* strpas bugfix
Revision 1.1.1.1 1998/03/25 11:18:46 root
* Restored version
Revision 1.4 1998/01/26 12:02:01 michael
+ Added log at the end
Working file: rtl/template/strings.pp
description:
----------------------------
revision 1.3
date: 1998/01/05 00:41:57; author: carl; state: Exp; lines: +4 -4
* Esthetic (spelling mistake) fix
----------------------------
revision 1.2
date: 1997/12/01 12:45:49; author: michael; state: Exp; lines: +14 -1
+ added copyright reference in header.
----------------------------
revision 1.1
date: 1997/11/27 08:33:49; author: michael; state: Exp;
Initial revision
----------------------------
revision 1.1.1.1
date: 1997/11/27 08:33:49; author: michael; state: Exp; lines: +0 -0
FPC RTL CVS start
=============================================================================
}