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/*
* $smu-mark$
* $name: gethostname.c$
* $author: Salvatore Sanfilippo <antirez@invece.org>$
* $copyright: Copyright (C) 1999 by Salvatore Sanfilippo$
* $license: This software is under GPL version 2 of license$
* $date: Fri Nov 5 11:55:47 MET 1999$
* $rev: 8$
*/

/* $Id: gethostname.c,v 1.2 2003/09/01 00:22:06 antirez Exp $ */

#include <stdio.h>
#include <netdb.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>

size_t strlcpy(char *dst, const char *src, size_t siz);

char *get_hostname(char* addr)
{
static char answer[1024];
static char lastreq[1024] = {'\0'}; /* last request */
struct hostent *he;
struct in_addr naddr;
static char *last_answerp = NULL;

printf(" get hostname..."); fflush(stdout);
printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"
" "
"\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");

if (!strcmp(addr, lastreq))
return last_answerp;

strlcpy(lastreq, addr, 1024);
inet_aton(addr, &naddr);
he = gethostbyaddr((char*)&naddr, 4, AF_INET);

if (he == NULL) {
last_answerp = NULL;
return NULL;
}

strlcpy(answer, he->h_name, 1024);
last_answerp = answer;

return answer;
}

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