1 | /* Test printf with x86-specific non-normal long double value. |
2 | Copyright (C) 2020-2024 Free Software Foundation, Inc. |
3 | |
4 | This file is part of the GNU C Library. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <https://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <stdio.h> |
21 | #include <string.h> |
22 | #include <support/check.h> |
23 | |
24 | /* Fill the stack with non-zero values. This makes a crash in |
25 | snprintf more likely. */ |
26 | static void __attribute__ ((noinline, noclone)) |
27 | fill_stack (void) |
28 | { |
29 | char buffer[65536]; |
30 | memset (buffer, 0xc0, sizeof (buffer)); |
31 | asm ("" ::: "memory" ); |
32 | } |
33 | |
34 | static int |
35 | do_test (void) |
36 | { |
37 | fill_stack (); |
38 | |
39 | long double value; |
40 | memcpy (&value, "\x00\x04\x00\x00\x00\x00\x00\x00\x00\x04" , 10); |
41 | |
42 | char buf[30]; |
43 | int ret = snprintf (s: buf, maxlen: sizeof (buf), format: "%Lg" , value); |
44 | TEST_COMPARE (ret, strlen (buf)); |
45 | TEST_COMPARE_STRING (buf, "nan" ); |
46 | return 0; |
47 | } |
48 | |
49 | #include <support/test-driver.c> |
50 | |