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# translate.awk --- do tr-like stuff
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
# August 1989
# February 2009 - bug fix
# Bugs: does not handle things like tr A-Z a-z; it has
# to be spelled out. However, if `to' is shorter than `from',
# the last character in `to' is used for the rest of `from'.
function stranslate(from, to, target, lf, lt, ltarget, t_ar, i, c,
result)
{
lf = length(from)
lt = length(to)
ltarget = length(target)
for (i = 1; i <= lt; i++)
t_ar[substr(from, i, 1)] = substr(to, i, 1)
if (lt < lf)
for (; i <= lf; i++)
t_ar[substr(from, i, 1)] = substr(to, lt, 1)
for (i = 1; i <= ltarget; i++) {
c = substr(target, i, 1)
if (c in t_ar)
c = t_ar[c]
result = result c
}
return result
}
function translate(from, to)
{
return $0 = stranslate(from, to, $0)
}
# main program
BEGIN {
if (ARGC < 3) {
print "usage: translate from to" > "/dev/stderr"
exit
}
FROM = ARGV[1]
TO = ARGV[2]
ARGC = 2
ARGV[1] = "-"
}
{
translate(FROM, TO)
print
}