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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051//// eof.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// Defines _eof(), which tests whether a file is at EOF.//#include <corecrt_internal_lowio.h>
// Tests if a file is at EOF. Returns:// * 1 if at EOF// * 0 if not at EOF// * -1 on failure (errno is set)extern "C" int __cdecl _eof(int const fh){ _CHECK_FH_CLEAR_OSSERR_RETURN(fh, EBADF, -1); _VALIDATE_CLEAR_OSSERR_RETURN((fh >= 0 && (unsigned)fh < (unsigned)_nhandle), EBADF, -1); _VALIDATE_CLEAR_OSSERR_RETURN((_osfile(fh) & FOPEN), EBADF, -1);
return __acrt_lowio_lock_fh_and_call(fh, [&]() { if ((_osfile(fh) & FOPEN) == 0) { errno = EBADF; _doserrno = 0; _ASSERTE(("Invalid file descriptor. File possibly closed by a different thread",0)); return -1; }
__int64 const here = _lseeki64_nolock(fh, 0ll, SEEK_CUR); if (here == -1ll) return -1;
__int64 const end = _lseeki64_nolock(fh, 0ll, SEEK_END); if (end == -1ll) return -1;
// Now we can test if we're at the end: if (here == end) return 1;
// If we aren't at the end, we need to reset the stream to its original // state before we return: _lseeki64_nolock(fh, here, SEEK_SET); return 0; });}