[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/fgetc.cpp

@@ -0,0 +1,81 @@
+//
+// fgetc.cpp
+//
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+//
+// Functions that read the next character from a stream and return it.  If the
+// read causes the stream to reach EOF, EOF is returned and the EOF bit is set
+// on the stream.
+//
+#include <corecrt_internal_stdio.h>
+
+
+
+extern "C" int __cdecl _fgetc_nolock(FILE* const public_stream)
+{
+    __crt_stdio_stream const stream(public_stream);
+
+    _VALIDATE_RETURN(stream.valid(), EINVAL, EOF);
+
+    --stream->_cnt;
+
+    if (stream->_cnt < 0)
+        return __acrt_stdio_refill_and_read_narrow_nolock(stream.public_stream());
+
+    char const c = *stream->_ptr;
+    ++stream->_ptr;
+    return c & 0xff;
+}
+
+
+
+extern "C" int __cdecl _getc_nolock(FILE* const stream)
+{
+    return _fgetc_nolock(stream);
+}
+
+
+
+extern "C" int __cdecl fgetc(FILE* const public_stream)
+{
+    __crt_stdio_stream const stream(public_stream);
+
+    _VALIDATE_RETURN(stream.valid(), EINVAL, EOF);
+
+    int return_value = 0;
+
+    _lock_file(stream.public_stream());
+    __try
+    {
+        _VALIDATE_STREAM_ANSI_RETURN(stream, EINVAL, EOF);
+        
+        return_value = _fgetc_nolock(stream.public_stream());
+    }
+    __finally
+    {
+        _unlock_file(stream.public_stream());
+    }
+
+    return return_value;
+}
+
+
+
+extern "C" int __cdecl getc(FILE* const stream)
+{
+    return fgetc(stream);
+}
+
+
+
+extern "C" int __cdecl _fgetchar()
+{
+    return fgetc(stdin);
+}
+
+
+
+extern "C" int __cdecl getchar()
+{
+    return _fgetchar();
+}