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herror.c
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C/C++ Source or Header
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1988-07-01
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56 lines
/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at 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'' without express or implied warranty.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)herror.c 6.2 (Berkeley) 3/7/88";
#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);
}