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Message-ID: <20140504013840.GB513@muslin> Date: Sat, 3 May 2014 18:38:40 -0700 From: Isaac Dunham <ibid.ag@...il.com> To: musl@...ts.openwall.com 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, writeonce@...ipix.org 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. eg: 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 HTH, Isaac Dunham
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