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55 lines
2.0 KiB
C
55 lines
2.0 KiB
C
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/* Test printf with grouping and padding (bug 30068)
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Copyright (C) 2023 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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#include <locale.h>
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#include <stdio.h>
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#include <support/check.h>
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#include <support/support.h>
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static int
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do_test (void)
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{
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char buf[80];
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xsetlocale (LC_NUMERIC, "de_DE.UTF-8");
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/* The format string has the following conversion specifier:
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' - Use thousands grouping.
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+ - The result of a signed conversion shall begin with a sign.
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- - Left justified.
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13 - Minimum 13 bytes of width.
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9 - Minimum 9 digits of precision.
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In bug 30068 the grouping characters were not accounted for in
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the width, and were added after the fact resulting in a 15-byte
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output instead of a 13-byte output. The two additional bytes
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come from the locale-specific thousands separator. This increase
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in size could result in a buffer overflow if a reasonable caller
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calculated the size of the expected buffer using nl_langinfo to
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determine the sie of THOUSEP in bytes.
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This bug is distinct from bug 23432 which has to do with the
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minimum precision calculation (digit based). */
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sprintf (buf, "%+-'13.9d", 1234567);
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TEST_COMPARE_STRING (buf, "+001.234.567 ");
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return 0;
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}
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#include <support/test-driver.c>
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