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 4488cef00e610745df0b7fdd447947c5b7b348c5..1aa0e1e5b30ccc36b66c5058722ec02898d7611b 100644 (file)
--- a/io/getwd.c
+++ b/io/getwd.c
@@ -1,39 +1,34 @@
-/* Copyright (C) 1991, 1992, 1996 Free Software Foundation, Inc.
+/* 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.
+   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.
+   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., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, 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)
     {
@@ -41,18 +36,19 @@ getwd (buf)
       return NULL;
     }
 
-  if (getcwd (fetchbuf, PATH_MAX) == NULL)
+  if (__getcwd (tmpbuf, PATH_MAX) == NULL)
     {
-#if defined HAVE_STRERROR_R || defined _LIBC
-      __strerror_r (errno, buf, PATH_MAX);
-#else
-      strncpy (buf, strerror (errno), PATH_MAX);
-#endif
+      /* 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.")