| 1 | /* Test printf with grouping and padding (bug 30068) |
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| 2 | Copyright (C) 2023-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <locale.h> |
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| 20 | #include <stdio.h> |
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| 21 | #include <support/check.h> |
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| 22 | #include <support/support.h> |
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| 23 | |
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| 24 | static int |
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| 25 | do_test (void) |
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| 26 | { |
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| 27 | char buf[80]; |
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| 28 | |
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| 29 | xsetlocale (LC_NUMERIC, locale: "de_DE.UTF-8" ); |
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| 30 | |
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| 31 | /* The format string has the following conversion specifier: |
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| 32 | ' - Use thousands grouping. |
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| 33 | + - The result of a signed conversion shall begin with a sign. |
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| 34 | - - Left justified. |
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| 35 | 13 - Minimum 13 bytes of width. |
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| 36 | 9 - Minimum 9 digits of precision. |
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| 37 | |
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| 38 | In bug 30068 the grouping characters were not accounted for in |
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| 39 | the width, and were added after the fact resulting in a 15-byte |
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| 40 | output instead of a 13-byte output. The two additional bytes |
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| 41 | come from the locale-specific thousands separator. This increase |
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| 42 | in size could result in a buffer overflow if a reasonable caller |
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| 43 | calculated the size of the expected buffer using nl_langinfo to |
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| 44 | determine the sie of THOUSEP in bytes. |
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| 45 | |
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| 46 | This bug is distinct from bug 23432 which has to do with the |
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| 47 | minimum precision calculation (digit based). */ |
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| 48 | sprintf (buf, "%+-'13.9d" , 1234567); |
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| 49 | TEST_COMPARE_STRING (buf, "+001.234.567 " ); |
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| 50 | |
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| 51 | return 0; |
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| 52 | } |
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| 53 | |
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| 54 | #include <support/test-driver.c> |
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| 55 | |
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