Update Gnulib to the latest git version

[deliverable/binutils-gdb.git] / gnulib / import / getlogin_r.c

diff --git a/gnulib/import/getlogin_r.c b/gnulib/import/getlogin_r.c
index 2bafb55fb146c174b1b4d721cb860331feffbf3c..a94282ca60f42a8bb516c9543bc305d95017015d 100644 (file)
--- a/gnulib/import/getlogin_r.c
+++ b/gnulib/import/getlogin_r.c
@@ -1,6 +1,6 @@
 /* Provide a working getlogin_r for systems which lack it.
 
-   Copyright (C) 2005-2007, 2010-2016 Free Software Foundation, Inc.
+   Copyright (C) 2005-2007, 2010-2019 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
@@ -13,7 +13,7 @@
    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/>.  */
+   along with this program; if not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert, Derek Price, and Bruno Haible.  */
 
@@ -25,7 +25,9 @@
 #include <errno.h>
 #include <string.h>
 
-#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+#include "malloca.h"
+
+#if defined _WIN32 && ! defined __CYGWIN__
 # define WIN32_LEAN_AND_MEAN
 # include <windows.h>
 #else
@@ -39,7 +41,7 @@ int
 getlogin_r (char *name, size_t size)
 {
 #undef getlogin_r
-#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+#if defined _WIN32 && ! defined __CYGWIN__
   /* Native Windows platform.  */
   DWORD sz;
 
@@ -63,9 +65,27 @@ getlogin_r (char *name, size_t size)
   /* Platform with a getlogin_r() function.  */
   int ret = getlogin_r (name, size);
 
-  if (ret == 0 && memchr (name, '\0', size) == NULL)
-    /* name contains a truncated result.  */
-    return ERANGE;
+  if (ret == 0)
+    {
+      const char *nul = memchr (name, '\0', size);
+      if (nul == NULL)
+        /* name contains a truncated result.  */
+        return ERANGE;
+      if (size > 0 && nul == name + size - 1)
+        {
+          /* strlen(name) == size-1.  Determine whether the untruncated result
+             would have had length size-1 or size.  */
+          char *room = (char *) malloca (size + 1);
+          if (room == NULL)
+            return ENOMEM;
+          ret = getlogin_r (room, size + 1);
+          /* The untruncated result should be the same as in the first call.  */
+          if (ret == 0 && memcmp (name, room, size) != 0)
+            /* The untruncated result would have been different.  */
+            ret = ERANGE;
+          freea (room);
+        }
+    }
   return ret;
 #else
   /* Platform with a getlogin() function.  */