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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788//// fclose.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines fclose(), which closes a stdio stream.//#include <corecrt_internal_stdio.h>#include <corecrt_internal_ptd_propagation.h>
// Closes a stdio stream after flushing the stream and freeing any buffer// associated with the stream (unless the buffer was set with setbuf). Returns// zero on success; EOF on failure (e.g., if the flush fails, or it is not a// valid file or the file is not open, etc.).static int __cdecl _fclose_nolock_internal(FILE* const public_stream, __crt_cached_ptd_host& ptd){ __crt_stdio_stream const stream(public_stream);
_UCRT_VALIDATE_RETURN(ptd, stream.valid(), EINVAL, EOF);
int result = EOF;
if (stream.is_in_use()) { result = __acrt_stdio_flush_nolock(stream.public_stream(), ptd); __acrt_stdio_free_buffer_nolock(stream.public_stream());
if (_close_internal(_fileno(stream.public_stream()), ptd) < 0) { result = EOF; } else if (stream->_tmpfname != nullptr) { _free_crt(stream->_tmpfname); stream->_tmpfname = nullptr; } }
__acrt_stdio_free_stream(stream);
return result;}
extern "C" int __cdecl _fclose_nolock(FILE* const public_stream){ __crt_cached_ptd_host ptd; return _fclose_nolock_internal(public_stream, ptd);}
static int __cdecl _fclose_internal(FILE* const public_stream, __crt_cached_ptd_host& ptd){ __crt_stdio_stream const stream(public_stream);
_UCRT_VALIDATE_RETURN(ptd, stream.valid(), EINVAL, EOF);
// If the stream is backed by a string, it requires no synchronization, // flushing, etc., so we can simply free it, which resets all of its // data to the defaults. if (stream.is_string_backed()) { __acrt_stdio_free_stream(stream); return EOF; }
int return_value = 0;
_lock_file(stream.public_stream()); __try { return_value = _fclose_nolock_internal(stream.public_stream(), ptd); } __finally { _unlock_file(stream.public_stream()); } __endtry
return return_value;}
extern "C" int __cdecl fclose(FILE* const public_stream){ __crt_cached_ptd_host ptd; return _fclose_internal(public_stream, ptd);}