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2b778ceb | 1 | /* Copyright (C) 1993-2021 Free Software Foundation, Inc. |
3586b2b6 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. |
3586b2b6 UD |
17 | |
18 | As a special exception, if you link the code in this file with | |
19 | files compiled with a GNU compiler to produce an executable, | |
20 | that does not cause the resulting executable to be covered by | |
21 | the GNU Lesser General Public License. This exception does not | |
22 | however invalidate any other reasons why the executable file | |
23 | might be covered by the GNU Lesser General Public License. | |
24 | This exception applies to code released by its copyright holders | |
25 | in files containing the exception. */ | |
26 | ||
27 | #include "libioP.h" | |
28 | #include <stdio.h> | |
29 | ||
30 | size_t | |
31 | __fread_unlocked_chk (void *__restrict ptr, size_t ptrlen, | |
32 | size_t size, size_t n, FILE *__restrict stream) | |
33 | { | |
34 | size_t bytes_requested = size * n; | |
35 | if (__builtin_expect ((n | size) | |
36 | >= (((size_t) 1) << (8 * sizeof (size_t) / 2)), 0)) | |
37 | { | |
38 | if (size != 0 && bytes_requested / size != n) | |
39 | __chk_fail (); | |
40 | } | |
41 | ||
a1ffb40e | 42 | if (__glibc_unlikely (bytes_requested > ptrlen)) |
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43 | __chk_fail (); |
44 | ||
45 | CHECK_FILE (stream, 0); | |
46 | if (bytes_requested == 0) | |
47 | return 0; | |
48 | ||
d18ea0c5 | 49 | size_t bytes_read = _IO_sgetn (stream, (char *) ptr, bytes_requested); |
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50 | return bytes_requested == bytes_read ? n : bytes_read / size; |
51 | } |