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Add lots of missing prototypes, constify a few things. Add explicit ints.
Makes gcc much happier, less warnings.

#!/bin/sh -
#	$OpenBSD: mkioctls,v 1.6 2001/08/18 00:48:57 espie Exp $

#
# Copyright (c) 1994
#	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.
#
#	@(#)mkioctls	8.2 (Berkeley) 4/28/95
#
cpp -nostdinc -idirafter $DESTDIR/usr/include -dM ${1+"$@"} | awk '
BEGIN {
	print "#include <sys/param.h>"
	print "#include <sys/socket.h>"
	print "#include <sys/socketvar.h>"
	print "#include <net/route.h>"
	print "#include <net/if.h>"
	print "#include <netinet/in.h>"
	print "#include <netinet/ip_mroute.h>"
	print "#include <netinet/if_ether.h>"
	print "#include <net/if_bridge.h>"
	print "#include <sys/termios.h>"
	print "#include <netinet/ip_ipsp.h>"
	print "#include <net/if_enc.h>"
	print "#define COMPAT_43"
	print "#include <sys/ioctl.h>"
	print ""
	print "const char *"
	print "ioctlname(val)"
	print "\tunsigned long val;"
	print "{"
	print ""
}

/^#[ 	]*define[ 	]*(TIO|FIO|SIO|OSIO)[A-Z]*[ 	]*_IO/ {
	
	# find where the name starts
	for (i = 1; i <= NF; i++)
		if ($i ~ /define/)
			break;
	++i;
	# 
	printf("\tif (val == %s)\n\t\treturn (\"%s\");\n", $i, $i);

}
END {
	print "\n\treturn (NULL);"
	print "}"
}
'