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Date: Sat, 3 May 2014 18:38:40 -0700
From: Isaac Dunham <>
Subject: Re: adding errc to support sed (FreeBSD)

On Sat, May 03, 2014 at 08:04:53PM -0400, Rich Felker wrote:
> On Sat, May 03, 2014 at 07:58:48PM -0400, wrote:
> > Greetings,
> > 
> > The FreeBSD implementation of sed uses errc; its implementation
> > should probably be as simple as:
> > 
> > _Noreturn void errc(int eval, int status, const char *fmt, ...)
> > {
> >         va_list ap;
> >         va_start(ap, fmt);
> >         vwarnx(status, fmt, ap);
> >         va_end(ap);
> >         exit(eval);
> > }
> What's the difference between this and other forms in err.h? Is there
> a 'v' version of it too?

There's errc(), verrc(), warnc(), and vwarnc().
All the *c variants add "int code" before char *fmt (int status in the 
example above), which allows passing an error that is not stored in errno.

void errc(int eval, int code, const char *fmt, ...);
void verrc(int eval, int code, const char *fmt, va_list args);
void warnc(int code, const char *fmt, ...);
void vwarnc(int code, const char *fmt, va_list args);
> > The FreeBSD sed also needs a couple of macros that are currently not
> > defined, specifically ALLPERMS, DEFFILEMODE and REG_STARTEND.  Any
> > reason not to add them when _BSD_SOURCE is defined?
> Where would these be defined? If they're in a junk header I'm not so
> opposed to them, but musl aims to have a cleaner namespace than legacy
> systems, whereas at least ALLPERMS and DEFFILEMODE are ugly and don't
> fit any sort of namespace pattern.
ALLPERMS and DEFFILEMODE are in sys/stat.h.
ALLPERMS is 07777; DEFFILEMODE is 0666.
REG_STARTEND is in regex.h.
> As for REG_STARTEND, is it an alias for some regex flag that already
> exists, or a feature that would need to be implemented?
It's an extension to POSIX that got mentioned here in January of last year;
it reuses pmatch[0] to provide a start and end (so as to handle embedded
nulls or start after n bytes).

> Rich

Isaac Dunham

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