1# $NetBSD: unif.awk,v 1.4 2008/04/29 06:53:01 martin Exp $ 2 3# Copyright (c) 2003 The NetBSD Foundation, Inc. 4# All rights reserved. 5# 6# This code is derived from software contributed to The NetBSD Foundation 7# by David Laight. 8# 9# Redistribution and use in source and binary forms, with or without 10# modification, are permitted provided that the following conditions 11# are met: 12# 1. Redistributions of source code must retain the above copyright 13# notice, this list of conditions and the following disclaimer. 14# 2. Redistributions in binary form must reproduce the above copyright 15# notice, this list of conditions and the following disclaimer in the 16# documentation and/or other materials provided with the distribution. 17# 18# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28# POSSIBILITY OF SUCH DAMAGE. 29 30# 'unif' lines of file 31# 32# usage: awk -f unif.awk -v defines=varlist file 33# 34# looks for blocks of the form: 35# 36# .if var [|| var] 37# ... 38# .else 39# ... 40# .endif 41# 42# and removes the unwanted lines 43# There is some error detection... 44 45BEGIN { 46 split(defines, defns) 47 for (v in defns) 48 deflist[defns[v]] = 1 49 delete defns 50 nested = 0 51 skip = 0 52} 53 54/^\.if/ { 55 nested++ 56 else_ok[nested] = 1 57 if (skip) 58 next 59 for (i = 2; i <= NF; i += 2) { 60 if ($i in deflist) 61 next 62 if ($(i+1) != "" && $(i+1) != "||") 63 exit 1 64 } 65 if (!skip) 66 skip = nested 67 next 68} 69 70/^\.else/ { 71 if (!else_ok[nested]) 72 exit 1 73 else_ok[nested] = 0 74 if (skip == nested) 75 skip = 0 76 else if (!skip) 77 skip = nested 78 next 79} 80 81/^\.endif/ { 82 if (nested == 0) 83 exit 1 84 if (skip == nested) 85 skip = 0 86 nested-- 87 next 88} 89 90{ 91 if (skip == 0) 92 print 93} 94 95END { 96 if (nested != 0) 97 exit 1 98} 99