Date: Wed, 12 Jul 2000 19:08:51 -0400 From: "Thomas M. Sommers" <tms2@mail.ptd.net> To: Dag-Erling Smorgrav <des@flood.ping.uio.no>, Mike Pritchard <mpp@mppsystems.com>, Alfred Perlstein <bright@wintelcom.net>, arch@FreeBSD.ORG Subject: Re: kernel printf %i? Message-ID: <396CFA83.BCB82874@mail.ptd.net> References: <5lzonpbc53.fsf@assaris.sics.se> <57067.963303670@axl.ops.uunet.co.za> <20000711013227.P25571@fw.wintelcom.net> <20000711041415.A16480@mppsystems.com> <xzpsntfg623.fsf@flood.ping.uio.no> <396CEA70.2C7A69B3@mail.ptd.net>
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"Thomas M. Sommers" wrote:
>
> Dag-Erling Smorgrav wrote:
> >
> > Speaking of printf(), there are two things I'd like to see added:
> >
> > - in libc, a *dprintf() family similar to *fprintf() except that they
> > write to a file descriptor instead of a FILE *.
>
> How about something like this:
>
<bad code snipped>
Or better yet, this:
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int dprintf(int fd, const char *format, ...)
{
char *buf;
int err = -1;
int len;
va_list args;
va_start(args, format);
len = vasprintf(&buf, format, args);
va_end(args);
if ( len != -1 ) {
err = write(fd, buf, len);
free(buf);
}
else {
errno = ENOMEM;
}
return err;
}
Thanks to Steve Kargl <sgk@troutmask.apl.washington.edu> for pointing
out my error.
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