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Part one of userland __P removal.  Done with a simple regexp with some minor hand editing to make comments line up correctly.  Another pass is forthcoming that handles the cases that could not be done automatically.

/*	$OpenBSD: what.c,v 1.7 2002/02/16 21:27:59 millert Exp $	*/
/*	$NetBSD: what.c,v 1.4 1994/12/20 16:01:03 jtc Exp $	*/

/*
 * Copyright (c) 1980, 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1988, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)what.c	8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: what.c,v 1.7 2002/02/16 21:27:59 millert Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/utsname.h>
#include <stdio.h>
#include <ctype.h>
#include <err.h>
#include <string.h>

void search(char *);

/*
 * what
 */
/* ARGSUSED */
int
main(argc, argv)
	int argc;
	char **argv;
{
	struct utsname utsn;
	char match[256];

	if (uname(&utsn) == -1)
		err(1, "uname");
	strncpy(match, utsn.sysname, sizeof match);

	if (!*++argv) 
		search(match);
	else do {
		if (!freopen(*argv, "r", stdin)) {
			perror(*argv);
			exit(1);
		}
		printf("%s\n", *argv);
		search(match);
	} while(*++argv);
	exit(0);
}

void
search(match)
	char *match;
{
	int c;
	int i;

	while ((c = getchar()) != EOF) {
loop:		if (c == '$') {
			for (i = 0; match[i]; i++)
				if ((c = getchar()) != match[i])
					goto loop;
			printf("\t$%s", match);
			while (isprint(c = getchar()))
				putchar(c);
			putchar('\n');
			goto loop;
		}
		if (c != '@')
			continue;
		if ((c = getchar()) != '(')
			goto loop;
		if ((c = getchar()) != '#')
			goto loop;
		if ((c = getchar()) != ')')
			goto loop;
		putchar('\t');
		while ((c = getchar()) != EOF && c && c != '"' &&
		    c != '>' && c != '\n')
			putchar(c);
		putchar('\n');
	}
}