/*	$NetBSD: errno2result.c,v 1.7 2022/09/23 12:15:34 christos Exp $	*/

/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * SPDX-License-Identifier: MPL-2.0
 *
 * 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 https://mozilla.org/MPL/2.0/.
 *
 * See the COPYRIGHT file distributed with this work for additional
 * information regarding copyright ownership.
 */

/*! \file */

#include "errno2result.h"
#include <stdbool.h>

#include <isc/platform.h>
#include <isc/result.h>
#include <isc/strerr.h>
#include <isc/string.h>
#include <isc/util.h>

/*%
 * Convert a POSIX errno value into an isc_result_t.  The
 * list of supported errno values is not complete; new users
 * of this function should add any expected errors that are
 * not already there.
 */
isc_result_t
isc___errno2result(int posixerrno, bool dolog, const char *file,
		   unsigned int line) {
	char strbuf[ISC_STRERRORSIZE];

	switch (posixerrno) {
	case ENOTDIR:
	case ELOOP:
	case EINVAL: /* XXX sometimes this is not for files */
	case ENAMETOOLONG:
	case EBADF:
		return (ISC_R_INVALIDFILE);
	case ENOENT:
		return (ISC_R_FILENOTFOUND);
	case EACCES:
	case EPERM:
		return (ISC_R_NOPERM);
	case EEXIST:
		return (ISC_R_FILEEXISTS);
	case EIO:
		return (ISC_R_IOERROR);
	case ENOMEM:
		return (ISC_R_NOMEMORY);
	case ENFILE:
	case EMFILE:
		return (ISC_R_TOOMANYOPENFILES);
#ifdef EDQUOT
	case EDQUOT:
		return (ISC_R_DISCQUOTA);
#endif /* ifdef EDQUOT */
	case ENOSPC:
		return (ISC_R_DISCFULL);
#ifdef EOVERFLOW
	case EOVERFLOW:
		return (ISC_R_RANGE);
#endif /* ifdef EOVERFLOW */
	case EPIPE:
#ifdef ECONNRESET
	case ECONNRESET:
#endif /* ifdef ECONNRESET */
#ifdef ECONNABORTED
	case ECONNABORTED:
#endif /* ifdef ECONNABORTED */
		return (ISC_R_CONNECTIONRESET);
#ifdef ENOTCONN
	case ENOTCONN:
		return (ISC_R_NOTCONNECTED);
#endif /* ifdef ENOTCONN */
#ifdef ETIMEDOUT
	case ETIMEDOUT:
		return (ISC_R_TIMEDOUT);
#endif /* ifdef ETIMEDOUT */
#ifdef ENOBUFS
	case ENOBUFS:
		return (ISC_R_NORESOURCES);
#endif /* ifdef ENOBUFS */
#ifdef EAFNOSUPPORT
	case EAFNOSUPPORT:
		return (ISC_R_FAMILYNOSUPPORT);
#endif /* ifdef EAFNOSUPPORT */
#ifdef ENETDOWN
	case ENETDOWN:
		return (ISC_R_NETDOWN);
#endif /* ifdef ENETDOWN */
#ifdef EHOSTDOWN
	case EHOSTDOWN:
		return (ISC_R_HOSTDOWN);
#endif /* ifdef EHOSTDOWN */
#ifdef ENETUNREACH
	case ENETUNREACH:
		return (ISC_R_NETUNREACH);
#endif /* ifdef ENETUNREACH */
#ifdef EHOSTUNREACH
	case EHOSTUNREACH:
		return (ISC_R_HOSTUNREACH);
#endif /* ifdef EHOSTUNREACH */
#ifdef EADDRINUSE
	case EADDRINUSE:
		return (ISC_R_ADDRINUSE);
#endif /* ifdef EADDRINUSE */
	case EADDRNOTAVAIL:
		return (ISC_R_ADDRNOTAVAIL);
	case ECONNREFUSED:
		return (ISC_R_CONNREFUSED);
	default:
		if (dolog) {
			strerror_r(posixerrno, strbuf, sizeof(strbuf));
			UNEXPECTED_ERROR(file, line,
					 "unable to convert errno "
					 "to isc_result: %d: %s",
					 posixerrno, strbuf);
		}
		/*
		 * XXXDCL would be nice if perhaps this function could
		 * return the system's error string, so the caller
		 * might have something more descriptive than "unexpected
		 * error" to log with.
		 */
		return (ISC_R_UNEXPECTED);
	}
}