[Bug fortran/16579] gfortran: (ICHAR(CHAR(I)) .NE. I) when 128 <= I <= 255

[Toon Moene]

sgk at troutmask dot apl dot washington dot edu wrote:

> ------- Additional Comments From sgk at troutmask dot apl dot washington dot edu  2004-07-16 04:24 -------
> 
> The standard says that the range for I in CHAR(I) "shall be of type integer
> with a value in the range [0, n - 1], where n is the number of characters
> in the collating sequence associated with the specified kind type parameter."
> Gfortran uses the ASCII collating sequence, which has 128 characters.  The
> standard does not specify the return value of CHAR(I) when I is not in the
> specified range.  So, this isn't a signed versus an unsigned problem.  It
> falls under the heading "processor defined behavior".  Personally, I think
> CHAR() and ICHAR() should do the appropriate range check and issues an
> error for out of range values.

I think it would be more useful to just allow the range 0..255 for the 
return value of ICHAR.  Too many codes depend on it.

I fixed this in 3.1 or 3.2 for g77 (when it suddenly went to -128 .. 127.

Cheers,

-- 
Toon Moene - mailto:toon@moene.indiv.nluug.nl - phoneto: +31 346 214290
Saturnushof 14, 3738 XG  Maartensdijk, The Netherlands
Maintainer, GNU Fortran 77: http://gcc.gnu.org/onlinedocs/g77_news.html
A maintainer of GNU Fortran 95: http://gcc.gnu.org/fortran/