copy_file_range: New function to copy file data

[glibc.git] / io / getwd.c

diff --git a/io/getwd.c b/io/getwd.c
index 8a8d01a28e0275e685fea0f96ee2bcbbf9a28137..1aa0e1e5b30ccc36b66c5058722ec02898d7611b 100644 (file)
--- a/io/getwd.c
+++ b/io/getwd.c
@@ -1,54 +1,54 @@
-/* Copyright (C) 1991, 1992, 1996 Free Software Foundation, Inc.
-This file is part of the GNU C Library.
+/* Obsolete function to get current working directory.
+   Copyright (C) 1991-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
 
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
 
-The GNU C Library 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
-Library General Public License for more details.
+   The GNU C Library 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
+   Lesser General Public License for more details.
 
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB.  If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA.  */
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
 
 #include <errno.h>
 #include <limits.h>
 #include <string.h>
 #include <unistd.h>
 
-/* Put the absolute pathname of the current working direction in BUF.
-   If successful, return BUF.  If not, put an error message in
-   BUF and return NULL.  BUF should be at least PATH_MAX bytes long.  */
+
 char *
-getwd (buf)
-     char *buf;
+getwd (char *buf)
 {
 #ifndef PATH_MAX
 #define PATH_MAX 1024
-  char fetchbuf[PATH_MAX];
-#else
-#define fetchbuf buf
 #endif
+  char tmpbuf[PATH_MAX];
 
   if (buf == NULL)
     {
-      errno = EINVAL;
+      __set_errno (EINVAL);
       return NULL;
     }
 
-  if (getcwd (fetchbuf, PATH_MAX) == NULL)
+  if (__getcwd (tmpbuf, PATH_MAX) == NULL)
     {
-      strncpy (buf, strerror (errno), PATH_MAX);
+      /* We use 1024 here since it should really be enough and because
+        this is a safe value.  */
+      __strerror_r (errno, buf, 1024);
       return NULL;
     }
 
-  if (fetchbuf != buf)
-    strcpy (buf, fetchbuf);
-
-  return buf;
+  /* This is completely unsafe.  Nobody can say how big the user
+     provided buffer is.  Perhaps the application and the libc
+     disagree about the value of PATH_MAX.  */
+  return strcpy (buf, tmpbuf);
 }
+
+link_warning (getwd,
+             "the `getwd' function is dangerous and should not be used.")