source: trunk/minix/lib/ack/libm2/Conversion.mod@ 12

(*
  (c) copyright 1988 by the Vrije Universiteit, Amsterdam, The Netherlands.
  See the copyright notice in the ACK home directory, in the file "Copyright".
*)

(*$R-*)
IMPLEMENTATION MODULE Conversions;
(*
  Module:       numeric-to-string conversions
  Author:       Ceriel J.H. Jacobs
  Version:      $Header: /cvsup/minix/src/lib/ack/libm2/Conversion.mod,v 1.1 2005/10/10 15:27:46 beng Exp $
*)

  PROCEDURE ConvertNum(num, len, base: CARDINAL;
                       neg: BOOLEAN;
                       VAR str: ARRAY OF CHAR);
    VAR i: CARDINAL;
        r: CARDINAL;
        tmp: ARRAY [0..20] OF CHAR;
    BEGIN
        i := 0;
        REPEAT
                r := num MOD base;
                num := num DIV base;
                IF r <= 9 THEN
                        tmp[i] := CHR(r + ORD('0'));
                ELSE
                        tmp[i] := CHR(r - 10 + ORD('A'));
                END;
                INC(i);
        UNTIL num = 0;
        IF neg THEN
                tmp[i] := '-';
                INC(i)
        END;
        IF len > HIGH(str) + 1 THEN len := HIGH(str) + 1; END;
        IF i > HIGH(str) + 1 THEN i := HIGH(str) + 1; END;
        r := 0;
        WHILE len > i DO str[r] := ' '; INC(r); DEC(len); END;
        WHILE i > 0 DO str[r] := tmp[i-1]; DEC(i); INC(r); END;
        WHILE r <= HIGH(str) DO
                str[r] := 0C;
                INC(r);
        END;
    END ConvertNum;

  PROCEDURE ConvertOctal(num, len: CARDINAL; VAR str: ARRAY OF CHAR);
  BEGIN   
        ConvertNum(num, len, 8, FALSE, str);
  END ConvertOctal;   

  PROCEDURE ConvertHex(num, len: CARDINAL; VAR str: ARRAY OF CHAR);
  BEGIN   
        ConvertNum(num, len, 16, FALSE, str);
  END ConvertHex;   

  PROCEDURE ConvertCardinal(num, len: CARDINAL; VAR str: ARRAY OF CHAR);   
  BEGIN   
        ConvertNum(num, len, 10, FALSE, str);
  END ConvertCardinal;   

  PROCEDURE ConvertInteger(num: INTEGER;
                           len: CARDINAL;   
                           VAR str: ARRAY OF CHAR); 
  BEGIN 
        IF (num < 0) AND (num >= -MAX(INTEGER)) THEN
                ConvertNum(-num, len, 10, TRUE, str);
        ELSE
                ConvertNum(CARDINAL(num), len, 10, num < 0, str);
        END;
  END ConvertInteger; 

END Conversions.