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c980549c | 1 | /* Test printf with grouping and padding (bug 30068) |
dff8da6b | 2 | Copyright (C) 2023-2024 Free Software Foundation, Inc. |
c980549c CD |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <locale.h> | |
20 | #include <stdio.h> | |
21 | #include <support/check.h> | |
22 | #include <support/support.h> | |
23 | ||
24 | static int | |
25 | do_test (void) | |
26 | { | |
27 | char buf[80]; | |
28 | ||
29 | xsetlocale (LC_NUMERIC, "de_DE.UTF-8"); | |
30 | ||
31 | /* The format string has the following conversion specifier: | |
32 | ' - Use thousands grouping. | |
33 | + - The result of a signed conversion shall begin with a sign. | |
34 | - - Left justified. | |
35 | 13 - Minimum 13 bytes of width. | |
36 | 9 - Minimum 9 digits of precision. | |
37 | ||
38 | In bug 30068 the grouping characters were not accounted for in | |
39 | the width, and were added after the fact resulting in a 15-byte | |
40 | output instead of a 13-byte output. The two additional bytes | |
41 | come from the locale-specific thousands separator. This increase | |
42 | in size could result in a buffer overflow if a reasonable caller | |
43 | calculated the size of the expected buffer using nl_langinfo to | |
44 | determine the sie of THOUSEP in bytes. | |
45 | ||
46 | This bug is distinct from bug 23432 which has to do with the | |
47 | minimum precision calculation (digit based). */ | |
48 | sprintf (buf, "%+-'13.9d", 1234567); | |
49 | TEST_COMPARE_STRING (buf, "+001.234.567 "); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | #include <support/test-driver.c> |