[libc-commits] [libc] [libc] Implement freopen (PR #207837)

[Jeff Bailey via libc-commits]

================
@@ -7,31 +7,41 @@
 //===----------------------------------------------------------------------===//
 ///
 /// \file
-/// Implementation of the POSIX fdopendir function.
+/// Implementation of freopen.
 ///
 //===----------------------------------------------------------------------===//
 
-#include "fdopendir.h"
+#include "src/stdio/freopen.h"
+#include "src/__support/File/file.h"
 
-#include "src/__support/File/dir.h"
+#include "hdr/types/FILE.h"
 #include "src/__support/common.h"
 #include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
 
 namespace LIBC_NAMESPACE_DECL {
 
-LLVM_LIBC_FUNCTION(DIR *, fdopendir, (int fd)) {
-  int check = platform_check_dir(fd);
-  if (check != 0) {
-    libc_errno = check;
+LLVM_LIBC_FUNCTION(::FILE *, freopen,
+                   (const char *__restrict filename,
+                    const char *__restrict mode, ::FILE *__restrict stream)) {
+  if (stream == nullptr) {
----------------
kaladron wrote:

POSIX mentions filename (pathname) as a null pointer, but not stream.  Should this be a LIBC_CRASH_ON_NULLPTR?

https://github.com/llvm/llvm-project/pull/207837