/*

 * Copyright (c) 1987, 1993

 *    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.

 * 4. 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.

 */

/*

 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.

 *

 * Permission to use, copy, modify, and distribute this software for any

 * purpose with or without fee is hereby granted, provided that the above

 * copyright notice and this permission notice appear in all copies.

 *

 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS

 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE

 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL

 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR

 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS

 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS

 * SOFTWARE.

 */

#include <sys/types.h>

#include <sys/param.h>

#include <sys/uio.h>

#include <netinet/in.h>

#include <arpa/nameser.h>

#include <netdb.h>

#include <resolv.h>

#include <string.h>

#include <unistd.h>

#include <libintl.h>

#include <not-cancel.h>

const char *const h_errlist[] = {

	N_("Resolver Error 0 (no error)"),

	N_("Unknown host"),			/* 1 HOST_NOT_FOUND */

	N_("Host name lookup failure"),		/* 2 TRY_AGAIN */

	N_("Unknown server error"),		/* 3 NO_RECOVERY */

	N_("No address associated with name"),	/* 4 NO_ADDRESS */

};

const int	h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };

/*

 * herror --

 *	print the error indicated by the h_errno value.

 */

void

herror(const char *s) {

	struct iovec iov[4], *v = iov;

	if (s != NULL && *s != '\0') {

		v->iov_base = (/*noconst*/ char *)s;

		v->iov_len = strlen(s);

		v++;

		v->iov_base = (char *) ": ";

		v->iov_len = 2;

		v++;

	}

	v->iov_base = (char *)hstrerror(h_errno);

	v->iov_len = strlen(v->iov_base);

	v++;

	v->iov_base = (char *) "\n";

	v->iov_len = 1;

	__writev_nocancel_nostatus(STDERR_FILENO, iov, (v - iov) + 1);

}

/*

 * hstrerror --

 *	return the string associated with a given "host" errno value.

 */

const char *

hstrerror(int err) {

	if (err < 0)

		return _("Resolver internal error");

	else if (err < h_nerr)

		return _(h_errlist[err]);

	return _("Unknown resolver error");

}

libc_hidden_def (hstrerror)