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From: guy@gorodish.UUCP
Newsgroups: comp.sources.bugs
Subject: Re: Problems with 'mush' on Pyramid
Message-ID: <29215@sun.uucp>
Date: Sun, 27-Sep-87 02:25:51 EDT
Article-I.D.: sun.29215
Posted: Sun Sep 27 02:25:51 1987
Date-Received: Sun, 27-Sep-87 22:15:57 EDT
References: <1002@pyrltd.UUCP>
Sender: news@sun.uucp
Lines: 41

> There are problems trying to use the recently posted 'mush' on a Pyramid
> (or anything that doesn't handle varags like a VAX).

Such as a Sun-4.

>  * if available.  msgbuf is the buffer used to print into if necessary.
>  * If you're running SUN3.2 or higher, the typecast (unsigned char *)msgbuf
>  * (where indicated) otherwise, msgbuf is not typecast at all.
>  * Also note same casting in wprint().

...

> #ifdef VPRINTF
>     if (fmt)
> 	vsprintf(msgbuf, fmt, &args); /* NULL in fmt reprints last msg */
> #else VPRINTF
>     foo._cnt = BUFSIZ;
>     foo._base = foo._ptr = msgbuf; /* may have to be cast(unsigned char *) */
>     foo._flag = _IOWRT+_IOSTRG;
>     if (fmt) {   /* passing NULL (not "") reprints last message */
> 	va_start(args);
> 	(void) _doprnt(fmt, args, &foo);
> 	va_end(args);
> 	*foo._ptr = '\0'; /* plant terminating null character */
>     }
> #endif VPIRNTF

1) On Suns running 3.2 or later, you actually don't *need* the cast - it just
keeps the compiler from issuing a warning.  The same warning will be issued on
other systems, such as most S5R2 or later systems, where the buffer is an array
of "unsigned char".

However, the vanilla S5R[2,3] standard I/O doesn't have _IOSTRG, so this code
won't work there.  Then again,

2) On Suns running 3.2 or later, or machines with the S5R2 or later standard
I/O, none of this is relevant anyway - they have "vprintf", "vfprintf", and
"vsprintf".  Just define VPRINTF when compiling for those systems.
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy@sun.com