X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gnulib%2Fimport%2Fgetlogin_r.c;h=a94282ca60f42a8bb516c9543bc305d95017015d;hb=c0c3707ff46ccfb78ea175dd42d628d8c90dca8b;hp=2bafb55fb146c174b1b4d721cb860331feffbf3c;hpb=f81e7e2db6d1aaf47561e54356aee12b585533c2;p=deliverable%2Fbinutils-gdb.git
diff --git a/gnulib/import/getlogin_r.c b/gnulib/import/getlogin_r.c
index 2bafb55fb1..a94282ca60 100644
--- 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 . */
+ along with this program; if not, see . */
/* Written by Paul Eggert, Derek Price, and Bruno Haible. */
@@ -25,7 +25,9 @@
#include
#include
-#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+#include "malloca.h"
+
+#if defined _WIN32 && ! defined __CYGWIN__
# define WIN32_LEAN_AND_MEAN
# include
#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. */