stdio-common/tst-grouping3.c

   1 /* Test printf with grouping and padding (bug 30068)
   2    Copyright (C) 2023-2024 Free Software Foundation, Inc.
   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>