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From: jhpb@granjon.ATT.COM (59452-JH Buehler(BLU123))
Newsgroups: comp.lang.c
Subject: Re:
Message-ID: <JHPB.90May4191340@granjon.ATT.COM>
Date: 4 May 90 18:13:40 GMT
References: <11290@hoptoad.uucp> <40628@cornell.UUCP> <7377@crdgw1.crd.ge.com>
	<1990May4.161910.1353@cs.columbia.edu>
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In-reply-to: travis@cs.columbia.edu's message of 4 May 90 16:19:10 GMT

I usually use a varargs routine, which in turn uses vsprintf().  This
lets me put what arguments in I like, and gets rid of the double
parentheses required in the #define solutions for similar functionality.

To get rid of the function calls when they're not needed, you can use
the #define trick and let the compiler optimize the function calls out.

e.g.,

#ifdef DEBUG
#	define LOG log
#else
#	define LOG if (0) log
#endif

LOG(level, "example %d", 1);

The log() I use puts in a time stamp, the process id, makes funny
characters visible, and writes it to a log file that gets renamed
elsewhere when the ulimit is hit.

Joe Buehler