55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
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/* Copyright (C) 1993-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#include "libioP.h"
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#include <stdio.h>
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size_t
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__fread_chk (void *__restrict ptr, size_t ptrlen,
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size_t size, size_t n, FILE *__restrict stream)
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{
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size_t bytes_requested = size * n;
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if (__builtin_expect ((n | size)
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>= (((size_t) 1) << (8 * sizeof (size_t) / 2)), 0))
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{
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if (size != 0 && bytes_requested / size != n)
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__chk_fail ();
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}
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if (__glibc_unlikely (bytes_requested > ptrlen))
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__chk_fail ();
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CHECK_FILE (stream, 0);
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if (bytes_requested == 0)
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return 0;
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size_t bytes_read;
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_IO_acquire_lock (stream);
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bytes_read = _IO_sgetn (stream, (char *) ptr, bytes_requested);
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_IO_release_lock (stream);
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return bytes_requested == bytes_read ? n : bytes_read / size;
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}
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