[UCRT] Import Microsoft.Windows.SDK.CRTSource version 10.0.22621.3

Imported from https://www.nuget.org/packages/Microsoft.Windows.SDK.CRTSource/10.0.22621.3
License: MIT

sdk/lib/ucrt/stdio/getw.cpp

@@ -0,0 +1,48 @@
+//
+// getw.cpp
+//
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+//
+// Defines _getw(), which reads a binary integer to a stream.
+//
+#include <corecrt_internal_stdio.h>
+
+
+
+// Reads a binary int value from the stream, byte-by-byte.  On success, returns
+// the value written; on failure (error or eof), returns EOF.  Note, however,
+// that the value may be EOF--that is, after all, a valid integer--so be sure to
+// test ferror() and feof() to check for error conditions.
+extern "C" int __cdecl _getw(FILE* const stream)
+{
+    _VALIDATE_RETURN(stream != nullptr, EINVAL, EOF);
+
+    int return_value = EOF;
+
+    _lock_file(stream);
+    __try
+    {
+        int value = 0;
+        char* const first = reinterpret_cast<char*>(&value);
+        char* const last  = first + sizeof(value);
+
+        for (char* it = first; it != last; ++it)
+        {
+            *it = static_cast<char>(_getc_nolock(stream));
+        }
+
+        if (feof(stream))
+            __leave;
+
+        if (ferror(stream))
+            __leave;
+
+        return_value = value;
+    }
+    __finally
+    {
+        _unlock_file(stream);
+    }
+
+    return return_value;
+}