xref: /csrg-svn/lib/libc/net/herror.c (revision 34816)
132631Sbostic /*
232631Sbostic  * Copyright (c) 1987 Regents of the University of California.
333679Sbostic  * All rights reserved.
433679Sbostic  *
533679Sbostic  * Redistribution and use in source and binary forms are permitted
6*34816Sbostic  * provided that the above copyright notice and this paragraph are
7*34816Sbostic  * duplicated in all such forms and that any documentation,
8*34816Sbostic  * advertising materials, and other materials related to such
9*34816Sbostic  * distribution and use acknowledge that the software was developed
10*34816Sbostic  * by the University of California, Berkeley.  The name of the
11*34816Sbostic  * University may not be used to endorse or promote products derived
12*34816Sbostic  * from this software without specific prior written permission.
13*34816Sbostic  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
14*34816Sbostic  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
15*34816Sbostic  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
1632631Sbostic  */
1732631Sbostic 
1832755Skarels #if defined(LIBC_SCCS) && !defined(lint)
19*34816Sbostic static char sccsid[] = "@(#)herror.c	6.3 (Berkeley) 06/27/88";
2033679Sbostic #endif /* LIBC_SCCS and not lint */
2132631Sbostic 
2232631Sbostic #include <sys/types.h>
2332631Sbostic #include <sys/uio.h>
2432631Sbostic 
2532631Sbostic char	*h_errlist[] = {
2632631Sbostic 	"Error 0",
2732631Sbostic 	"Unknown host",				/* 1 HOST_NOT_FOUND */
2832631Sbostic 	"Host name lookup failure",		/* 2 TRY_AGAIN */
2932631Sbostic 	"Unknown server error",			/* 3 NO_RECOVERY */
3032631Sbostic 	"No address associated with name",	/* 4 NO_ADDRESS */
3132631Sbostic };
3232631Sbostic int	h_nerr = { sizeof(h_errlist)/sizeof(h_errlist[0]) };
3332631Sbostic 
3432631Sbostic extern int	h_errno;
3532631Sbostic 
3632631Sbostic /*
3732631Sbostic  * herror --
3832631Sbostic  *	print the error indicated by the h_errno value.
3932631Sbostic  */
4032631Sbostic herror(s)
4132631Sbostic 	char *s;
4232631Sbostic {
4332631Sbostic 	struct iovec iov[4];
4432631Sbostic 	register struct iovec *v = iov;
4532631Sbostic 
4632631Sbostic 	if (s && *s) {
4732631Sbostic 		v->iov_base = s;
4832631Sbostic 		v->iov_len = strlen(s);
4932631Sbostic 		v++;
5032631Sbostic 		v->iov_base = ": ";
5132631Sbostic 		v->iov_len = 2;
5232631Sbostic 		v++;
5332631Sbostic 	}
5432631Sbostic 	v->iov_base = h_errno < h_nerr ? h_errlist[h_errno] : "Unknown error";
5532631Sbostic 	v->iov_len = strlen(v->iov_base);
5632631Sbostic 	v++;
5732631Sbostic 	v->iov_base = "\n";
5832631Sbostic 	v->iov_len = 1;
5932631Sbostic 	writev(2, iov, (v - iov) + 1);
6032631Sbostic }
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