Re: Asian Characters and strchr()

[Jaroslav Hajek]

On Wed, Mar 11, 2009 at 8:24 AM, Ben Abbott <address@hidden> wrote:
> I noticed that fileparts give an error when the full-file contains asian
> characters.
>
> ctave:209> fileparts ("System/Library/Fonts/junk.ttf")
> error: subscript indices must be either positive integers or logicals.
> error: called from:
> error:
> /Users/bpabbott/Development/mercurial/octave-3.1.53/scripts/strings/strchr.m
> at line 40, column 19
> error:
> /Users/bpabbott/Development/mercurial/octave-3.1.53/scripts/miscellaneous/fileparts.m
> at line 30, column 10
>
> It appears that there is a simple fix for strchr, but it will depend upon
> the ascii equivalent for Asian fonts.
>
> I'm seeing negative values.
>
> fullfile = "System/Library/Fonts/junk.ttf";
> octave:211> double(fullfile)
> ans =
>
>  Columns 1 through 16:
>
>    83   121   115   116   101   109    47    76   105    98   114    97
> 114   121    47    70
>
>  Columns 17 through 32:
>
>   111   110   116   115    47   -27  -115  -114   -26  -106  -121   -25
> -69  -122   -23   -69
>
>  Columns 33 through 37:
>
>  -111    46   116   116   102
>
> Can anyone tell me what the permissible range for integer values of Asian
> characters is?

I think a char->double conversion is supposed to yield nonnegative
values, so this seems buggy.

> I'm planning to patch strchr, any reason I shouldn't do that?
>

I don't think there's a bug in strchr. This is clearly caused by the
negative values.

-- 
RNDr. Jaroslav Hajek
computing expert & GNU Octave developer
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz