X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fxgethostname.c;h=5b8b9b2e860d0b3557aeee41423b60feebff027d;hb=d3195542b41d5b8bb6e282211cc52b6c73afaccf;hp=d20967574dacb8cc536b36d69ec705604609b940;hpb=783c1624bd8b027a65b3fba57d3213ccb1a6ddbd;p=gnulib.git

diff --git a/lib/xgethostname.c b/lib/xgethostname.c
index d20967574..5b8b9b2e8 100644
--- a/lib/xgethostname.c
+++ b/lib/xgethostname.c
@@ -1,5 +1,7 @@
 /* xgethostname.c -- return current hostname with unlimited length
-   Copyright (C) 1992 Free Software Foundation, Inc.
+
+   Copyright (C) 1992, 1996, 2000, 2001, 2003, 2004, 2005 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
@@ -13,41 +15,69 @@
 
    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.  */
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
 
-/* Written by Jim Meyering, meyering@comco.com */
+/* written by Jim Meyering */
 
 #ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
 
-#include <sys/types.h>
+/* Specification.  */
+#include "xgethostname.h"
+
+#include <stdlib.h>
+#include <errno.h>
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include "xalloc.h"
 
-int gethostname ();
-char *xmalloc ();
-char *xrealloc ();
+#ifndef ENAMETOOLONG
+# define ENAMETOOLONG 0
+#endif
 
 #ifndef INITIAL_HOSTNAME_LENGTH
-# define INITIAL_HOSTNAME_LENGTH 33
+# define INITIAL_HOSTNAME_LENGTH 34
 #endif
 
+/* Return the current hostname in malloc'd storage.
+   If malloc fails, exit.
+   Upon any other failure, return NULL and set errno.  */
 char *
-xgethostname ()
+xgethostname (void)
 {
-  char *hostname;
-  size_t size;
-  int err;
+  char *hostname = NULL;
+  size_t size = INITIAL_HOSTNAME_LENGTH;
 
-  size = INITIAL_HOSTNAME_LENGTH;
-  hostname = xmalloc (size);
   while (1)
     {
-      hostname[size - 1] = '\0';
-      err = gethostname (hostname, size);
-      if (err == 0 && hostname[size - 1] == '\0')
-	break;
-      size *= 2;
-      hostname = xrealloc (hostname, size);
+      /* Use SIZE_1 here rather than SIZE to work around the bug in
+	 SunOS 5.5's gethostname whereby it NUL-terminates HOSTNAME
+	 even when the name is as long as the supplied buffer.  */
+      size_t size_1;
+
+      hostname = x2realloc (hostname, &size);
+      size_1 = size - 1;
+      hostname[size_1 - 1] = '\0';
+      errno = 0;
+
+      if (gethostname (hostname, size_1) == 0)
+	{
+	  if (! hostname[size_1 - 1])
+	    break;
+	}
+      else if (errno != 0 && errno != ENAMETOOLONG && errno != EINVAL
+	       /* OSX/Darwin does this when the buffer is not large enough */
+	       && errno != ENOMEM)
+	{
+	  int saved_errno = errno;
+	  free (hostname);
+	  errno = saved_errno;
+	  return NULL;
+	}
     }
 
   return hostname;