/* xgethostname.c -- return current hostname with unlimited length
- Copyright (C) 1992 Free Software Foundation, Inc.
+ Copyright (C) 1992, 1996 Free Software Foundation, Inc.
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
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, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
-/* Written by Jim Meyering, meyering@comco.com */
+/* written by Jim Meyering */
#ifdef HAVE_CONFIG_H
-#if defined (CONFIG_BROKETS)
-/* We use <config.h> instead of "config.h" so that a compilation
- using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
- (which it would do because it found this file in $srcdir). */
-#include <config.h>
-#else
-#include "config.h"
-#endif
+# include <config.h>
#endif
#include <sys/types.h>
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#include "error.h"
+
+#ifndef EXIT_FAILURE
+# define EXIT_FAILURE 1
+#endif
+
int gethostname ();
char *xmalloc ();
char *xrealloc ();
#ifndef INITIAL_HOSTNAME_LENGTH
-#define INITIAL_HOSTNAME_LENGTH 33
+# define INITIAL_HOSTNAME_LENGTH 34
#endif
char *
int err;
size = INITIAL_HOSTNAME_LENGTH;
+ hostname = xmalloc (size);
while (1)
{
- hostname = xmalloc (size);
- hostname[size - 1] = '\0';
+ /* Use size - 2 here rather than size - 1 to work around the bug
+ in SunOS5.5's gethostname whereby it NUL-terminates HOSTNAME
+ even when the name is longer than the supplied buffer. */
+ int k = size - 2;
+
+ errno = 0;
+ hostname[k] = '\0';
err = gethostname (hostname, size);
- if (err || hostname[size - 1] == '\0')
+ if (err == 0 && hostname[k] == '\0')
break;
+#ifdef ENAMETOOLONG
+ else if (err != 0 && errno != ENAMETOOLONG && errno != 0)
+ error (EXIT_FAILURE, errno, "gethostname");
+#endif
size *= 2;
hostname = xrealloc (hostname, size);
}