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diff --git a/lib/isc/commandline.c b/lib/isc/commandline.c
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+/*
+ * Portions Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*
+ * Copyright (c) 1987, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+
+/*! \file
+ * This file was adapted from the NetBSD project's source tree, RCS ID:
+ * NetBSD: getopt.c,v 1.15 1999/09/20 04:39:37 lukem Exp
+ *
+ * The primary change has been to rename items to the ISC namespace
+ * and format in the ISC coding style.
+ */
+
+#include <config.h>
+
+#include <stdbool.h>
+#include <stdio.h>
+
+#include <isc/commandline.h>
+#include <isc/mem.h>
+#include <isc/msgs.h>
+#include <isc/print.h>
+#include <isc/string.h>
+#include <isc/util.h>
+
+/*% Index into parent argv vector. */
+LIBISC_EXTERNAL_DATA int isc_commandline_index = 1;
+/*% Character checked for validity. */
+LIBISC_EXTERNAL_DATA int isc_commandline_option;
+/*% Argument associated with option. */
+LIBISC_EXTERNAL_DATA char *isc_commandline_argument;
+/*% For printing error messages. */
+LIBISC_EXTERNAL_DATA char *isc_commandline_progname;
+/*% Print error messages. */
+LIBISC_EXTERNAL_DATA bool isc_commandline_errprint = true;
+/*% Reset processing. */
+LIBISC_EXTERNAL_DATA bool isc_commandline_reset = true;
+
+static char endopt = '\0';
+
+#define BADOPT '?'
+#define BADARG ':'
+#define ENDOPT &endopt
+
+/*!
+ * getopt --
+ * Parse argc/argv argument vector.
+ */
+int
+isc_commandline_parse(int argc, char * const *argv, const char *options) {
+ static char *place = ENDOPT;
+ const char *option; /* Index into *options of option. */
+
+ REQUIRE(argc >= 0 && argv != NULL && options != NULL);
+
+ /*
+ * Update scanning pointer, either because a reset was requested or
+ * the previous argv was finished.
+ */
+ if (isc_commandline_reset || *place == '\0') {
+ if (isc_commandline_reset) {
+ isc_commandline_index = 1;
+ isc_commandline_reset = false;
+ }
+
+ if (isc_commandline_progname == NULL)
+ isc_commandline_progname = argv[0];
+
+ if (isc_commandline_index >= argc ||
+ *(place = argv[isc_commandline_index]) != '-') {
+ /*
+ * Index out of range or points to non-option.
+ */
+ place = ENDOPT;
+ return (-1);
+ }
+
+ if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
+ /*
+ * Found '--' to signal end of options. Advance
+ * index to next argv, the first non-option.
+ */
+ isc_commandline_index++;
+ place = ENDOPT;
+ return (-1);
+ }
+ }
+
+ isc_commandline_option = *place++;
+ option = strchr(options, isc_commandline_option);
+
+ /*
+ * Ensure valid option has been passed as specified by options string.
+ * '-:' is never a valid command line option because it could not
+ * distinguish ':' from the argument specifier in the options string.
+ */
+ if (isc_commandline_option == ':' || option == NULL) {
+ if (*place == '\0')
+ isc_commandline_index++;
+
+ if (isc_commandline_errprint && *options != ':')
+ fprintf(stderr, "%s: %s -- %c\n",
+ isc_commandline_progname,
+ isc_msgcat_get(isc_msgcat,
+ ISC_MSGSET_COMMANDLINE,
+ ISC_MSG_ILLEGALOPT,
+ "illegal option"),
+ isc_commandline_option);
+
+ return (BADOPT);
+ }
+
+ if (*++option != ':') {
+ /*
+ * Option does not take an argument.
+ */
+ isc_commandline_argument = NULL;
+
+ /*
+ * Skip to next argv if at the end of the current argv.
+ */
+ if (*place == '\0')
+ ++isc_commandline_index;
+
+ } else {
+ /*
+ * Option needs an argument.
+ */
+ if (*place != '\0')
+ /*
+ * Option is in this argv, -D1 style.
+ */
+ isc_commandline_argument = place;
+
+ else if (argc > ++isc_commandline_index)
+ /*
+ * Option is next argv, -D 1 style.
+ */
+ isc_commandline_argument = argv[isc_commandline_index];
+
+ else {
+ /*
+ * Argument needed, but no more argv.
+ */
+ place = ENDOPT;
+
+ /*
+ * Silent failure with "missing argument" return
+ * when ':' starts options string, per historical spec.
+ */
+ if (*options == ':')
+ return (BADARG);
+
+ if (isc_commandline_errprint)
+ fprintf(stderr, "%s: %s -- %c\n",
+ isc_commandline_progname,
+ isc_msgcat_get(isc_msgcat,
+ ISC_MSGSET_COMMANDLINE,
+ ISC_MSG_OPTNEEDARG,
+ "option requires "
+ "an argument"),
+ isc_commandline_option);
+
+ return (BADOPT);
+ }
+
+ place = ENDOPT;
+
+ /*
+ * Point to argv that follows argument.
+ */
+ isc_commandline_index++;
+ }
+
+ return (isc_commandline_option);
+}
+
+isc_result_t
+isc_commandline_strtoargv(isc_mem_t *mctx, char *s, unsigned int *argcp,
+ char ***argvp, unsigned int n)
+{
+ isc_result_t result;
+
+ restart:
+ /* Discard leading whitespace. */
+ while (*s == ' ' || *s == '\t')
+ s++;
+
+ if (*s == '\0') {
+ /* We have reached the end of the string. */
+ *argcp = n;
+ *argvp = isc_mem_get(mctx, n * sizeof(char *));
+ if (*argvp == NULL)
+ return (ISC_R_NOMEMORY);
+ } else {
+ char *p = s;
+ while (*p != ' ' && *p != '\t' && *p != '\0' && *p != '{') {
+ if (*p == '\n') {
+ *p = ' ';
+ goto restart;
+ }
+ p++;
+ }
+
+ /* do "grouping", items between { and } are one arg */
+ if (*p == '{') {
+ char *t = p;
+ /*
+ * shift all characters to left by 1 to get rid of '{'
+ */
+ while (*t != '\0') {
+ t++;
+ *(t-1) = *t;
+ }
+ while (*p != '\0' && *p != '}') {
+ p++;
+ }
+ /* get rid of '}' character */
+ if (*p == '}') {
+ *p = '\0';
+ p++;
+ }
+ /* normal case, no "grouping" */
+ } else if (*p != '\0')
+ *p++ = '\0';
+
+ result = isc_commandline_strtoargv(mctx, p,
+ argcp, argvp, n + 1);
+ if (result != ISC_R_SUCCESS)
+ return (result);
+ (*argvp)[n] = s;
+ }
+
+ return (ISC_R_SUCCESS);
+}
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