/*
 * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
 *
 * Permission to use, copy, modify, and/or 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 ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC 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.
 */

/* $Id: errno2result.c,v 1.5 2020/09/14 08:40:44 florian Exp $ */

/*! \file */

#include <errno.h>
#include <string.h>

#include <isc/result.h>
#include <isc/util.h>

#include "errno2result.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, int dolog,
                   const char *file, unsigned int line)
{
        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);
        case EOVERFLOW:
                return (ISC_R_RANGE);
        case EPIPE:
        case ECONNRESET:
        case ECONNABORTED:
                return (ISC_R_CONNECTIONRESET);
        case ENOTCONN:
                return (ISC_R_NOTCONNECTED);
        case ETIMEDOUT:
                return (ISC_R_TIMEDOUT);
        case ENOBUFS:
                return (ISC_R_NORESOURCES);
        case EAFNOSUPPORT:
                return (ISC_R_FAMILYNOSUPPORT);
        case ENETDOWN:
                return (ISC_R_NETDOWN);
        case EHOSTDOWN:
                return (ISC_R_HOSTDOWN);
        case ENETUNREACH:
                return (ISC_R_NETUNREACH);
        case EHOSTUNREACH:
                return (ISC_R_HOSTUNREACH);
        case EADDRINUSE:
                return (ISC_R_ADDRINUSE);
        case EADDRNOTAVAIL:
                return (ISC_R_ADDRNOTAVAIL);
        case ECONNREFUSED:
                return (ISC_R_CONNREFUSED);
        default:
                if (dolog) {
                        UNEXPECTED_ERROR(file, line, "unable to convert errno "
                                         "to isc_result: %d: %s",
                                         posixerrno, strerror(posixerrno));
                }
                /*
                 * 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);
        }
}