stdio-common/test-vfprintf.c

   1 /* Tests of *printf for very large strings.
   2    Copyright (C) 2000-2024 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 <array_length.h>
  20 #include <locale.h>
  21 #include <mcheck.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <sys/stat.h>
  28 #include <libc-diag.h>
  29
  30
  31 const char *locs[] =
  32 {
  33   "C", "de_DE.ISO-8859-1", "de_DE.UTF-8", "ja_JP.EUC-JP"
  34 };
  35
  36 char large[50000];
  37
  38 static int
  39 do_test (void)
  40 {
  41   char buf[25];
  42   size_t i;
  43   int res = 0;
  44   int fd;
  45
  46   mtrace ();
  47
  48   strcpy (buf, "/tmp/test-vfprintfXXXXXX");
  49   fd = mkstemp (buf);
  50   if (fd == -1)
  51     {
  52       printf ("cannot open temporary file: %m\n");
  53       exit (1);
  54     }
  55   unlink (buf);
  56
  57   for (i = 0; i < array_length (locs); ++i)
  58     {
  59       FILE *fp;
  60       struct stat st;
  61       int fd2;
  62
  63       setlocale (LC_ALL, locs[i]);
  64
  65       memset (large, '\1', sizeof (large));
  66       large[sizeof (large) - 1] = '\0';
  67
  68       fd2 = dup (fd);
  69       if (fd2 == -1)
  70         {
  71           printf ("cannot dup for locale %s: %m\n",
  72                   setlocale (LC_ALL, NULL));
  73           exit (1);
  74         }
  75
  76       if (ftruncate (fd2, 0) != 0)
  77         {
  78           printf ("cannot truncate file for locale %s: %m\n",
  79                   setlocale (LC_ALL, NULL));
  80           exit (1);
  81         }
  82
  83       fp = fdopen (fd2, "a");
  84       if (fp == NULL)
  85         {
  86           printf ("cannot create FILE for locale %s: %m\n",
  87                   setlocale (LC_ALL, NULL));
  88           exit (1);
  89         }
  90
  91       fprintf (fp, "%s", large);
  92       fprintf (fp, "%.*s", 30000, large);
  93       large[20000] = '\0';
  94       /* We're testing a large format string here and need to generate it
  95          to avoid this source file being ridiculous.  So disable the warning
  96          about a generated format string.  */
  97       DIAG_PUSH_NEEDS_COMMENT;
  98       DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat-security");
  99       fprintf (fp, large);
 100       DIAG_POP_NEEDS_COMMENT;
 101       fprintf (fp, "%-1.300000000s", "hello");
 102
 103       if (fflush (fp) != 0 || ferror (fp) != 0 || fclose (fp) != 0)
 104         {
 105           printf ("write error for locale %s: %m\n",
 106                   setlocale (LC_ALL, NULL));
 107           exit (1);
 108         }
 109
 110       if (fstat (fd, &st) != 0)
 111         {
 112           printf ("cannot stat for locale %s: %m\n",
 113                   setlocale (LC_ALL, NULL));
 114           exit (1);
 115         }
 116       else if (st.st_size != 50000 + 30000 + 19999 + 5)
 117         {
 118           printf ("file size incorrect for locale %s: %jd instead of %jd\n",
 119                   setlocale (LC_ALL, NULL),
 120                   (intmax_t) st.st_size,
 121                   (intmax_t) 50000 + 30000 + 19999 + 5);
 122           res = 1;
 123         }
 124       else
 125         printf ("locale %s OK\n", setlocale (LC_ALL, NULL));
 126     }
 127
 128   close (fd);
 129
 130   return res;
 131 }
 132
 133 #define TEST_FUNCTION do_test ()
 134 #include "../test-skeleton.c"