# $NetBSD: join.awk,v 1.7 2019/10/24 16:52:11 rhialto Exp $
#
# Copyright (c) 2002 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Luke Mewburn of Wasabi Systems.
#
# 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.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
#
# join.awk F1 F2
# Similar to join(1), this reads a list of words from F1
# and outputs lines in F2 with a first word that is in F1.
# For purposes of matching the first word, both instances are
# canonicalised via unvis(word); the version from F2 is printed.
# Neither file needs to be sorted.
function unvis(s) \
{
# XXX: We don't handle the complete range of vis encodings
unvis_result = ""
while (length(s) > 0) {
unvis_pos = match(s, "\\\\.")
if (unvis_pos == 0) {
unvis_result = unvis_result "" s
s = ""
break
}
# copy the part before the next backslash
unvis_result = unvis_result "" substr(s, 1, unvis_pos - 1)
s = substr(s, unvis_pos)
# process the backslash and next few chars
if (substr(s, 1, 2) == "\\\\") {
# double backslash -> single backslash
unvis_result = unvis_result "\\"
s = substr(s, 3)
} else if (match(s, "\\\\[0-7][0-7][0-7]") == 1) {
# \ooo with three octal digits.
# XXX: use strnum() is that is available
unvis_result = unvis_result "" sprintf("%c", \
0+substr(s, 2, 1) * 64 + \
0+substr(s, 3, 1) * 8 + \
0+substr(s, 4, 1))
s = substr(s, 5)
} else {
# unrecognised escape: keep the literal backslash
printf "%s: %s:%s: unrecognised escape %s\n", \
ARGV[0], (FILENAME ? FILENAME : "stdin"), FNR, \
substr(s, 1, 2) \
>"/dev/stderr"
unvis_result = unvis_result "" substr(s, 1, 1)
s = substr(s, 2)
}
}
return unvis_result
}
BEGIN \
{
if (ARGC != 3) {
printf("Usage: join file1 file2\n") >"/dev/stderr"
exit 1
}
while ( (getline < ARGV[1]) > 0) {
f1 = unvis($1)
words[f1] = $0
}
delete ARGV[1]
}
