Adding upstream version 9.4.upstream/9.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 92 insertions, 0 deletions

diff --git a/lib/freopen.c b/lib/freopen.c
new file mode 100644
index 0000000..646aa7c
--- /dev/null
+++ b/lib/freopen.c
@@ -0,0 +1,92 @@
+/* Open a stream to a file.
+   Copyright (C) 2007-2023 Free Software Foundation, Inc.
+
+   This file 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 3 of the
+   License, or (at your option) any later version.
+
+   This file 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 Lesser General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
+
+/* If the user's config.h happens to include <stdio.h>, let it include only
+   the system's <stdio.h> here, so that orig_freopen doesn't recurse to
+   rpl_freopen.  */
+#define _GL_ALREADY_INCLUDING_STDIO_H
+#include <config.h>
+
+/* Get the original definition of freopen.  It might be defined as a macro.  */
+#include <stdio.h>
+#undef _GL_ALREADY_INCLUDING_STDIO_H
+
+#include <errno.h>
+
+static FILE *
+orig_freopen (const char *filename, const char *mode, FILE *stream)
+{
+  return freopen (filename, mode, stream);
+}
+
+/* Specification.  */
+/* Write "stdio.h" here, not <stdio.h>, otherwise OSF/1 5.1 DTK cc eliminates
+   this include because of the preliminary #include <stdio.h> above.  */
+#include "stdio.h"
+
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+FILE *
+rpl_freopen (const char *filename, const char *mode, FILE *stream)
+{
+  FILE *result;
+#if defined _WIN32 && ! defined __CYGWIN__
+  char const *null_device = "NUL";
+  if (filename && strcmp (filename, "/dev/null") == 0)
+    filename = null_device;
+#else
+  char const *null_device = "/dev/null";
+#endif
+
+#ifdef __KLIBC__
+  errno = 0;
+#endif
+
+  result = orig_freopen (filename, mode, stream);
+
+  if (!result)
+    {
+#ifdef __KLIBC__
+      /* On OS/2 kLIBC, freopen returns NULL even if it is successful
+         if filename is NULL. */
+      if (!filename && !errno)
+        result = stream;
+#endif
+    }
+  else if (filename)
+    {
+      int fd = fileno (result);
+      if (dup2 (fd, fd) < 0 && errno == EBADF)
+        {
+          int nullfd = open (null_device, O_RDONLY | O_CLOEXEC);
+          int err = 0;
+          if (nullfd != fd)
+            {
+              if (dup2 (nullfd, fd) < 0)
+                err = 1;
+              close (nullfd);
+            }
+          if (!err)
+            result = orig_freopen (filename, mode, result);
+        }
+    }
+
+  return result;
+}