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1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162//// rewind.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines rewind(), which rewinds a stream.//#include <corecrt_internal_stdio.h>#include <corecrt_internal_ptd_propagation.h>
// Rewinds a stream back to the beginning, if the stream supports seeking. The// stream is flushed and errors are cleared before the rewind.static void __cdecl _rewind_internal(FILE* const public_stream, __crt_cached_ptd_host& ptd){ __crt_stdio_stream const stream(public_stream);
_UCRT_VALIDATE_RETURN_VOID(ptd, stream.valid(), EINVAL);
int const fh = _fileno(stream.public_stream());
_lock_file(stream.public_stream()); __try { // Flush the streeam, reset the error state, and seek back to the // beginning: __acrt_stdio_flush_nolock(stream.public_stream(), ptd); // If the stream is opened in update mode and is currently in use for reading, // the buffer must be abandoned to ensure consistency when transitioning from // reading to writing. // __acrt_stdio_flush_nolock will not reset the buffer when _IOWRITE flag // is not set. __acrt_stdio_reset_buffer(stream);
stream.unset_flags(_IOERROR | _IOEOF); _osfile_safe(fh) &= ~(FEOFLAG);
if (stream.has_all_of(_IOUPDATE)) { stream.unset_flags(_IOREAD | _IOWRITE); }
if (_lseek_internal(fh, 0, 0, ptd) == -1) { stream.set_flags(_IOERROR); } } __finally { _unlock_file(stream.public_stream()); } __endtry}
extern "C" void __cdecl rewind(FILE* const public_stream){ __crt_cached_ptd_host ptd; _rewind_internal(public_stream, ptd);}