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From: mouse@mcgill-vision.UUCP (der Mouse)
Newsgroups: net.lang.c
Subject: Re: Another printf-type question
Message-ID: <463@mcgill-vision.UUCP>
Date: Mon, 21-Jul-86 22:27:44 EDT
Article-I.D.: mcgill-v.463
Posted: Mon Jul 21 22:27:44 1986
Date-Received: Mon, 28-Jul-86 05:03:36 EDT
References: <2138@brl-smoke.ARPA> <2153@brl-smoke.ARPA>
Organization: McGill University, Montreal
Lines: 52

>> invprintf(fmt,args)
>> {
>>         printf(<string to go into inverse video mode>);
>>         printf(fmt,args);
>>         printf(<string to leave inverse mode>);
>> }
> Assuming you're using UNIX System V Release 2.0 for sake of concreteness,
> [...solution involving....
> 	(void)vprintf( fmt, args );	/* warning! not printf(va_arg etc. */
> ]

Sounds to me more like assuming SVR2 for the sake of  possibility.  Many
Unices  do not have  vprintf(), much though AT&T may wish it  otherwise.
Absent some indication of  what flavor  of UNIX the  solution is desired
for, an "answer"  using  vprintf() not much of an answer.  I doubt  that
the original poster is prepared to change operating systems just  to get
a portable version of invprintf().

By the way, when I need something like this I write it as follows:

/* VARARGS 1 */
invprintf(fmt,a1,a2,a3,a4,a5,a6,a7,a8)
char *fmt;
int a1;
int a2;
int a3;
int a4;
int a5;
int a6;
int a7;
int a8;
{
 printf(<inverse-video-string>);
 printf(fmt,a1,a2,a3,a4,a5,a6,a7,a8);
 printf(<exit-inverse-video-string>);
}

Anyone out there care to enlighten me as to  all the ways  in which this
can fail (besides wanting to print more than eight arguments)?  It works
on enough  machines that I  don't feel *too* guilty using it.   I  would
guess that  it works on  substantially more  machines than the vprintf()
solution.
-- 
					der Mouse

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