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(* StrCase.mod provides procedure to convert between text case.
Copyright (C) 2001-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 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
General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE StrCase ;
FROM ASCII IMPORT nul ;
FROM StrLib IMPORT StrLen ;
(*
StrToUpperCase - converts string, a, to uppercase returning the
result in, b.
*)
PROCEDURE StrToUpperCase (a: ARRAY OF CHAR ; VAR b: ARRAY OF CHAR) ;
VAR
higha,
highb,
i : CARDINAL ;
BEGIN
higha := StrLen(a) ;
highb := HIGH(b) ;
i := 0 ;
WHILE (i<higha) AND (a[i]#nul) AND (i<highb) DO
b[i] := Cap(a[i]) ;
INC(i)
END ;
IF i<highb
THEN
b[i] := nul
END
END StrToUpperCase ;
(*
StrToLowerCase - converts string, a, to lowercase returning the
result in, b.
*)
PROCEDURE StrToLowerCase (a: ARRAY OF CHAR ; VAR b: ARRAY OF CHAR) ;
VAR
higha,
highb,
i : CARDINAL ;
BEGIN
higha := StrLen(a) ;
highb := HIGH(b) ;
i := 0 ;
WHILE (i<higha) AND (a[i]#nul) AND (i<highb) DO
b[i] := Lower(a[i]) ;
INC(i)
END ;
IF i<highb
THEN
b[i] := nul
END
END StrToLowerCase ;
(*
Cap - converts a lower case character into a capital character.
If the character is not a lower case character 'a'..'z'
then the character is simply returned unaltered.
*)
PROCEDURE Cap (ch: CHAR) : CHAR ;
BEGIN
IF (ch>='a') AND (ch<='z')
THEN
ch := CHR( ORD(ch)-ORD('a')+ORD('A') )
END ;
RETURN( ch )
END Cap ;
(*
Lower - converts an upper case character into a lower case character.
If the character is not an upper case character 'A'..'Z'
then the character is simply returned unaltered.
*)
PROCEDURE Lower (ch: CHAR) : CHAR ;
BEGIN
IF (ch>='A') AND (ch<='Z')
THEN
ch := CHR( ORD(ch)-ORD('A')+ORD('a') )
END ;
RETURN( ch )
END Lower ;
END StrCase.
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