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Subject: Re: Grep 2.22 null-byte check fails.
From: "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
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Am Samstag, 7. November 2015 15:38:35 UTC+1 schrieb Eli Zaretskii (eliz AT gnu DOT org) [via djgpp AT delorie DOT com]:
> > Date: Sat, 07 Nov 2015 15:21:32 +0100
> > From: "Juan Manuel Guerrero (juan DOT guerrero AT gmx DOT de) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
> > 
> > I am porting grep 2.22 and the null-byte check fails.
> > This check creates a file called "in" with the content: 00 0D 0A
> > and a pattern file called "pat" with the content: 00 24 0D 0A
> > and then runs the command:
> >   LC_ALL=C
> >   grep -a -f pat in
> > 
> > As result I get the output:
> > 
> > null-byte: failed test: -a '\0$' does not match '\0'
> 
> Isn't this an EOL issue?  The input file have the DOS CR-LF EOL, but
> the null byte will AFAIR cause Grep to consider the file as binary,
> and thus not strip the CR characters from the end of line.  Then \0$
> won't match because the character after the null byte is \r, not \n.
> 
> What happens if you convert 'in' to Unix EOL format?

You are right, if I change the in file into UNIX format then the check passes.  But then I fear I have not really understood what the function of null-byte shall be on DOS/WINDOWS or any other OS with EOL different from UNIX format.

Thank you for the help,
Juan M. Guerrero