BSD 4_3_Tahoe release

[unix-history] / usr / src / lib / libc / net / herror.c

/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley.  The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)herror.c    6.3 (Berkeley) 6/27/88";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/uio.h>

char    *h_errlist[] = {
       "Error 0",
       "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]) };

extern int      h_errno;

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

       if (s && *s) {
               v->iov_base = s;
               v->iov_len = strlen(s);
               v++;
               v->iov_base = ": ";
               v->iov_len = 2;
               v++;
       }
       v->iov_base = h_errno < h_nerr ? h_errlist[h_errno] : "Unknown error";
       v->iov_len = strlen(v->iov_base);
       v++;
       v->iov_base = "\n";
       v->iov_len = 1;
       writev(2, iov, (v - iov) + 1);
}