tcpdump/mkdep

#!/bin/sh -
#
# Copyright (c) 1994, 1996
#	The Regents of the University of California.  All rights reserved.
#
# Redistribution and use in source and binary forms are permitted
# provided that this notice is preserved and that due credit is given
# to the University of California at Berkeley. The name of the University
# may not be used to endorse or promote products derived from this
# software without specific prior written permission. This software
# is provided ``as is'' without express or implied warranty.
#
#	@(#)mkdep.sh	5.11 (Berkeley) 5/5/88
#

MAKE=Makefile			# default makefile name is "Makefile"
CC=cc				# default C compiler is "cc"
DEPENDENCY_CFLAG=-M		# default dependency-generation flag is -M

while :
	do case "$1" in
		# -c allows you to specify the C compiler
		-c)
			CC=$2
			shift; shift ;;

		# -f allows you to select a makefile name
		-f)
			MAKE=$2
			shift; shift ;;

		# -m allows you to specify the dependency-generation flag
		-m)
			DEPENDENCY_CFLAG=$2
			shift; shift ;;

		# the -p flag produces "program: program.c" style dependencies
		# so .o's don't get produced
		-p)
			SED='s;\.o;;'
			shift ;;
		*)
			break ;;
	esac
done

if [ $# = 0 ] ; then
	echo 'usage: mkdep [-p] [-c cc] [-f makefile] [-m dependency-cflag] [flags] file ...'
	exit 1
fi

if [ ! -w $MAKE ]; then
	echo "mkdep: no writeable file \"$MAKE\""
	exit 1
fi

TMP=/tmp/mkdep$$

trap 'rm -f $TMP ; exit 1' 1 2 3 13 15

cp $MAKE ${MAKE}.bak

sed -e '/DO NOT DELETE THIS LINE/,$d' < $MAKE > $TMP

cat << _EOF_ >> $TMP
# DO NOT DELETE THIS LINE -- mkdep uses it.
# DO NOT PUT ANYTHING AFTER THIS LINE, IT WILL GO AWAY.

_EOF_

# If your compiler doesn't have -M, add it.  If you can't, the next two
# lines will try and replace the "cc -M".  The real problem is that this
# hack can't deal with anything that requires a search path, and doesn't
# even try for anything using bracket (<>) syntax.
#
# egrep '^#include[ 	]*".*"' /dev/null $* |
# sed -e 's/:[^"]*"\([^"]*\)".*/: \1/' -e 's/\.c/.o/' |

# XXX this doesn't work with things like "-DDECLWAITSTATUS=union\ wait"
$CC $DEPENDENCY_CFLAG $* |
sed "
	s; \./; ;g
	$SED" |
awk '{
	if ($1 != prev) {
		if (rec != "")
			print rec;
		rec = $0;
		prev = $1;
	}
	else {
		if (length(rec $2) > 78) {
			print rec;
			rec = $0;
		}
		else
			rec = rec " " $2
	}
}
END {
	print rec
}' >> $TMP

cat << _EOF_ >> $TMP

# IF YOU PUT ANYTHING HERE IT WILL GO AWAY
_EOF_

# copy to preserve permissions
cp $TMP $MAKE
rm -f ${MAKE}.bak $TMP
exit 0