X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fxgethostname.c;h=0f7b178f380d77e77d03a96fd63e09582a8b5701;hb=cd56634a4a8179fd5a4419fbb3e27211b042ab1c;hp=f00d7bd5f53e35682b3abeef675ab8e94e00c4cc;hpb=a38bc613499aee7806cecf6615af4ad2a09def61;p=gnulib.git

diff --git a/lib/xgethostname.c b/lib/xgethostname.c
index f00d7bd5f..0f7b178f3 100644
--- a/lib/xgethostname.c
+++ b/lib/xgethostname.c
@@ -1,28 +1,73 @@
-#include <sys/types.h>
+/* xgethostname.c -- return current hostname with unlimited length
 
-int gethostname ();
-char *xmalloc ();
-char *xrealloc ();
+   Copyright (C) 1992, 1996, 2000-2001, 2003-2006, 2009-2014 Free Software
+   Foundation, Inc.
 
-#define INITIAL_HOSTNAME_LENGTH 33
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.  */
+
+/* written by Jim Meyering */
+
+#include <config.h>
+
+/* Specification.  */
+#include "xgethostname.h"
+
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "xalloc.h"
+
+#ifndef INITIAL_HOSTNAME_LENGTH
+# 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;
   while (1)
     {
-      hostname = xmalloc (size);
-      hostname[size - 1] = '\0';
-      err = gethostname (hostname, size);
-      if (err || 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;