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Re: libtasn1-4.9 ctype issue

From: Thomas Klausner
Subject: Re: libtasn1-4.9 ctype issue
Date: Tue, 17 Jan 2017 09:55:21 +0100

On Mon, Jan 16, 2017 at 07:33:31PM +0100, Nikos Mavrogiannopoulos wrote:
> On Mon, 2017-01-16 at 02:24 +0100, Thomas Klausner wrote:
> > Hi!
> > 
> > Compilation of libtasn1 on NetBSD fails with the default setting of
> > -Werror because of:
> > 
> > ASN1.y: In function '_asn1_yylex':
> > ASN1.y:578:9: error: array subscript has type 'char' [-Werror=char-
> > subscripts]
> >          if (!isdigit (string[k]))
> >          ^
> > 
> > NetBSD is pickier with ctype macros than most other operating
> > systems.
> Hi,
>  I do not see the issue. 'k' is defined as integer. If it is an issue
> with the netbsd compiler please provide a patch to address it.

The problem is not with k, but with the argument of "isdigit", which
is "string[k]". That's defined as char, not unsigned char.

The standard solution is to cast it to (unsigned char), see attached
patch, since it was already checked that it can't be -1 when we get


Attachment: patch-lib_ASN1.y
Description: Text document

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