others
/* $Id$ */
/* Copyright (c) 2008-2014 Pierre Pronchery <khorben@defora.org> */
/* This file is part of DeforaOS Unix others */
/* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#ifndef PROGNAME
# define PROGNAME "hostname"
#endif
/* hostname */
/* private */
/* prototypes */
static int _hostname(char const * name);
static int _hostname_error(char const * message, int ret);
static int _hostname_usage(void);
/* functions */
/* hostname */
static int _hostname(char const * name)
{
char buf[128];
if(name != NULL)
{
if(sethostname(name, strlen(name)) != 0)
return _hostname_error("sethostname", 1);
return 0;
}
if(gethostname(buf, sizeof(buf)) != 0)
return _hostname_error("gethostname", 1);
puts(buf);
return 0;
}
/* hostname_error */
static int _hostname_error(char const * message, int ret)
{
fputs(PROGNAME ": ", stderr);
perror(message);
return ret;
}
/* hostname_usage */
static int _hostname_usage(void)
{
fputs("Usage: " PROGNAME " [name]\n", stderr);
return 1;
}
/* public */
/* functions */
/* main */
int main(int argc, char * argv[])
{
int o;
char const * name = NULL;
while((o = getopt(argc, argv, "")) != -1)
switch(o)
{
default:
return _hostname_usage();
}
if(optind + 1 == argc)
name = argv[optind];
else if(optind != argc)
return _hostname_usage();
return (_hostname(name) == 0) ? 0 : 2;
}