Add include files to get prototype declarations, and fix bugs found.

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

/*
* Copyright (c) 1987 Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)herror.c    6.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/uio.h>
#include <netdb.h>
#include <unistd.h>
#include <string.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.
*/
void
herror(s)
       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 = (u_int)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(STDERR_FILENO, iov, (v - iov) + 1);
}