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: /usr/share/doc/gawk/examples/prog/ [ drwxr-xr-x ]
name : translate.awk

 # 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
}