StdLib/BsdSocketLib/herror.c

/*
 * Copyright (c) 1987, 1993
 *  The Regents of the University of California.  All rights reserved.
 *
 * Portions copyright (c) 1999, 2000
 * Intel Corporation.
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *
 *    This product includes software developed by the University of
 *    California, Berkeley, Intel Corporation, and its contributors.
 *
 * 4. Neither the name of University, Intel Corporation, or their respective
 *    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, INTEL CORPORATION 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,
 * INTEL CORPORATION 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 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.

  herror.c  8.1 (Berkeley) 6/4/93
  herror.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 Exp
 */

#include <sys/types.h>
#include <sys/uio.h>
#include <netdb.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>

const char *h_errlist[] = {
  "Resolver Error 0 (no error)",
  "Unknown host",       /* 1 HOST_NOT_FOUND */
  "Host name lookup failure",   /* 2 TRY_AGAIN */
  "Unknown server error",     /* 3 NO_RECOVERY */
  "No address associated with name",  /* 4 NO_ADDRESS */
};
int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };

int h_errno;

const char *
hstrerror(
  int err
  );

/*
 * herror --
 *  print the error indicated by the h_errno value.
 */
void
herror(
  const char *s
  )
{
  struct iovec iov[4];
  register struct iovec *v = iov;

  if (s && *s) {
    v->iov_base = (char *)s;
    v->iov_len = strlen(s);
    v++;
    v->iov_base = ": ";
    v->iov_len = 2;
    v++;
  }
  v->iov_base = (char *)hstrerror(h_errno);
  v->iov_len = strlen(v->iov_base);
  v++;
  v->iov_base = "\n";
  v->iov_len = 1;
#if defined(_ORG_FREEBSD_) || defined(__GNUC__)
  writev(STDERR_FILENO, iov, (v - iov) + 1);
#else
  {
    int   i;
    for (i = 0; i < (v - iov) + 1; i++)
      fprintf( stderr, iov[i].iov_base);
  }
#endif

}

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");
}