libio/tst-ftell-partial-wide.c

   1 /* Verify that ftell does not go into an infinite loop when a conversion fails
   2    due to insufficient space in the buffer.
   3    Copyright (C) 2014-2023 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #include <wchar.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <locale.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27
  28 static int do_test (void);
  29 #define TEST_FUNCTION do_test ()
  30 #include "../test-skeleton.c"
  31
  32 /* Arbitrary number large enough so that the target buffer during conversion is
  33    not large enough.  */
  34 #define STRING_SIZE (1400)
  35 #define NSTRINGS (2)
  36
  37 static int
  38 do_test (void)
  39 {
  40   FILE *fp = NULL;
  41   wchar_t *inputs[NSTRINGS] = {NULL};
  42   int ret = 1;
  43
  44   if (setlocale (LC_ALL, "en_US.UTF-8") == NULL)
  45     {
  46       printf ("Cannot set en_US.UTF-8 locale.\n");
  47       goto out;
  48     }
  49
  50
  51   /* Generate input from one character, chosen because it has an odd number of
  52      bytes in UTF-8, making it easier to reproduce the problem:
  53
  54      NAME    Hiragana letter GO
  55      CHAR    ご
  56      UTF-8   E38194
  57      UCS     3054
  58      MARC-8  692434  */
  59   wchar_t seed = L'ご';
  60   for (int i = 0; i < NSTRINGS; i++)
  61     {
  62       inputs[i] = malloc (STRING_SIZE * sizeof (wchar_t));
  63       if (inputs[i] == NULL)
  64         {
  65           printf ("Failed to allocate memory for inputs: %m\n");
  66           goto out;
  67         }
  68       wmemset (inputs[i], seed, STRING_SIZE - 1);
  69       inputs[i][STRING_SIZE - 1] = L'\0';
  70     }
  71
  72   char *filename;
  73   int fd = create_temp_file ("tst-fseek-wide-partial.out", &filename);
  74
  75   if (fd == -1)
  76     {
  77       printf ("create_temp_file: %m\n");
  78       goto out;
  79     }
  80
  81   fp = fdopen (fd, "w+");
  82   if (fp == NULL)
  83     {
  84       printf ("fopen: %m\n");
  85       close (fd);
  86       goto out;
  87     }
  88
  89   for (int i = 0; i < NSTRINGS; i++)
  90     {
  91       printf ("offset: %ld\n", ftell (fp));
  92       if (fputws (inputs[i], fp) == -1)
  93         {
  94           perror ("fputws");
  95           goto out;
  96         }
  97     }
  98   ret = 0;
  99
 100 out:
 101   if (fp != NULL)
 102     fclose (fp);
 103   for (int i = 0; i < NSTRINGS; i++)
 104     free (inputs[i]);
 105
 106   return ret;
 107 }