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# getopt.awk --- Do C library getopt(3) function in awk
# Also supports long options.
#
# Arnold Robbins, arnold@skeeve.com, Public Domain
#
# Initial version: March, 1991
# Revised: May, 1993
# Long options added by Greg Minshall, January 2020
# External variables:
# Optind -- index in ARGV of first nonoption argument
# Optarg -- string value of argument to current option
# Opterr -- if nonzero, print our own diagnostic
# Optopt -- current option letter
# Returns:
# -1 at end of options
# "?" for unrecognized option
# <s> a string representing the current option
# Private Data:
# _opti -- index in multiflag option, e.g., -abc
function getopt(argc, argv, options, longopts, thisopt, i, j)
{
if (length(options) == 0 && length(longopts) == 0)
return -1 # no options given
if (argv[Optind] == "--") { # all done
Optind++
_opti = 0
return -1
} else if (argv[Optind] !~ /^-[^:[:space:]]/) {
_opti = 0
return -1
}
if (argv[Optind] !~ /^--/) { # if this is a short option
if (_opti == 0)
_opti = 2
thisopt = substr(argv[Optind], _opti, 1)
Optopt = thisopt
i = index(options, thisopt)
if (i == 0) {
if (Opterr)
printf("%c -- invalid option\n", thisopt) > "/dev/stderr"
if (_opti >= length(argv[Optind])) {
Optind++
_opti = 0
} else
_opti++
return "?"
}
if (substr(options, i + 1, 1) == ":") {
# get option argument
if (length(substr(argv[Optind], _opti + 1)) > 0)
Optarg = substr(argv[Optind], _opti + 1)
else
Optarg = argv[++Optind]
_opti = 0
} else
Optarg = ""
if (_opti == 0 || _opti >= length(argv[Optind])) {
Optind++
_opti = 0
} else
_opti++
return thisopt
} else {
j = index(argv[Optind], "=")
if (j > 0)
thisopt = substr(argv[Optind], 3, j - 3)
else
thisopt = substr(argv[Optind], 3)
Optopt = thisopt
i = match(longopts, "(^|,)" thisopt "($|[,:])")
if (i == 0) {
if (Opterr)
printf("%s -- invalid option\n", thisopt) > "/dev/stderr"
Optind++
return "?"
}
if (substr(longopts, i+1+length(thisopt), 1) == ":") {
if (j > 0)
Optarg = substr(argv[Optind], j + 1)
else
Optarg = argv[++Optind]
} else
Optarg = ""
Optind++
return thisopt
}
}
BEGIN {
Opterr = 1 # default is to diagnose
Optind = 1 # skip ARGV[0]
# test program
if (_getopt_test) {
_myshortopts = "ab:cd"
_mylongopts = "longa,longb:,otherc,otherd"
while ((_go_c = getopt(ARGC, ARGV, _myshortopts, _mylongopts)) != -1)
printf("c = <%s>, Optarg = <%s>\n", _go_c, Optarg)
printf("non-option arguments:\n")
for (; Optind < ARGC; Optind++)
printf("\tARGV[%d] = <%s>\n", Optind, ARGV[Optind])
}
}