X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fxgethostname.c;h=aa0b9dc85b8b0d0eb7278ea74e97126648dc4038;hb=023946e6df1ce4ce382f2385306427413fe46085;hp=f00d7bd5f53e35682b3abeef675ab8e94e00c4cc;hpb=a38bc613499aee7806cecf6615af4ad2a09def61;p=gnulib.git

diff --git a/lib/xgethostname.c b/lib/xgethostname.c
index f00d7bd5f..aa0b9dc85 100644
--- a/lib/xgethostname.c
+++ b/lib/xgethostname.c
@@ -1,28 +1,76 @@
+/* xgethostname.c -- return current hostname with unlimited length
+   Copyright (C) 1992, 1996, 2000 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
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   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, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* written by Jim Meyering */
+
+#ifdef HAVE_CONFIG_H
+# include <config.h>
+#endif
+
 #include <sys/types.h>
 
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#include "error.h"
+
+#ifndef ENAMETOOLONG
+# define ENAMETOOLONG 9999
+#endif
+
+#ifndef EXIT_FAILURE
+# define EXIT_FAILURE 1
+#endif
+
 int gethostname ();
 char *xmalloc ();
 char *xrealloc ();
 
-#define INITIAL_HOSTNAME_LENGTH 33
+#ifndef INITIAL_HOSTNAME_LENGTH
+# define INITIAL_HOSTNAME_LENGTH 34
+#endif
 
 char *
 xgethostname ()
 {
   char *hostname;
   size_t size;
-  int err;
 
   size = INITIAL_HOSTNAME_LENGTH;
+  /* Use size + 1 here rather than size 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.  */
+  hostname = xmalloc (size + 1);
   while (1)
     {
-      hostname = xmalloc (size);
-      hostname[size - 1] = '\0';
+      int k = size - 1;
+      int err;
+
+      errno = 0;
+      hostname[k] = '\0';
       err = gethostname (hostname, size);
-      if (err || hostname[size - 1] == '\0')
+      if (err >= 0 && hostname[k] == '\0')
 	break;
+      else if (err < 0 && errno != ENAMETOOLONG && errno != 0)
+	error (EXIT_FAILURE, errno, "gethostname");
       size *= 2;
-      hostname = xrealloc (hostname, size);
+      hostname = xrealloc (hostname, size + 1);
     }
 
   return hostname;