libio/tst-fseek.c

   1 /* Verify that fseek/ftell combination works for wide chars.
   2    Copyright (C) 2012-2016 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <locale.h>
  22 #include <errno.h>
  23 #include <wchar.h>
  24 #include <unistd.h>
  25 #include <string.h>
  26
  27 /* Defined in test-skeleton.c.  */
  28 static int create_temp_file (const char *base, char **filename);
  29
  30
  31 static int
  32 do_seek_end (FILE *fp)
  33 {
  34   long save;
  35
  36   if (fputws (L"abc\n", fp) == -1)
  37     {
  38       printf ("do_seek_end: fputws: %s\n", strerror (errno));
  39       return 1;
  40     }
  41
  42   save = ftell (fp);
  43   rewind (fp);
  44
  45   if (fseek (fp, 0, SEEK_END) == -1)
  46     {
  47       printf ("do_seek_end: fseek: %s\n", strerror (errno));
  48       return 1;
  49     }
  50
  51   if (save != ftell (fp))
  52     {
  53       printf ("save = %ld, ftell = %ld\n", save, ftell (fp));
  54       return 1;
  55     }
  56
  57   return 0;
  58 }
  59
  60 int
  61 do_seek_set (FILE *fp)
  62 {
  63   long save1, save2;
  64
  65   if (fputws (L"ゅう\n", fp) == -1)
  66     {
  67       printf ("seek_set: fputws(1): %s\n", strerror (errno));
  68       return 1;
  69     }
  70
  71   save1 = ftell (fp);
  72
  73   if (fputws (L"ゅう\n", fp) == -1)
  74     {
  75       printf ("seek_set: fputws(2): %s\n", strerror (errno));
  76       return 1;
  77     }
  78
  79   save2 = ftell (fp);
  80
  81   if (fputws (L"ゅう\n", fp) == -1)
  82     {
  83       printf ("seek_set: fputws(3): %s\n", strerror (errno));
  84       return 1;
  85     }
  86
  87   if (fseek (fp, save1, SEEK_SET) == -1)
  88     {
  89       printf ("seek_set: fseek(1): %s\n", strerror (errno));
  90       return 1;
  91     }
  92
  93   if (save1 != ftell (fp))
  94     {
  95       printf ("save1 = %ld, ftell = %ld\n", save1, ftell (fp));
  96       return 1;
  97     }
  98
  99   if (fseek (fp, save2, SEEK_SET) == -1)
 100     {
 101       printf ("seek_set: fseek(2): %s\n", strerror (errno));
 102       return 1;
 103     }
 104
 105   if (save2 != ftell (fp))
 106     {
 107       printf ("save2 = %ld, ftell = %ld\n", save2, ftell (fp));
 108       return 1;
 109     }
 110
 111   return 0;
 112 }
 113
 114 static int
 115 do_test (void)
 116 {
 117   if (setlocale (LC_ALL, "ja_JP.UTF-8") == NULL)
 118     {
 119       printf ("Cannot set ja_JP.UTF-8 locale.\n");
 120       exit (1);
 121     }
 122
 123   /* Retain messages in English.  */
 124   if (setlocale (LC_MESSAGES, "en_US.ISO-8859-1") == NULL)
 125     {
 126       printf ("Cannot set LC_MESSAGES to en_US.ISO-8859-1 locale.\n");
 127       exit (1);
 128     }
 129
 130   int ret = 0;
 131   char *filename;
 132   int fd = create_temp_file ("tst-fseek.out", &filename);
 133
 134   if (fd == -1)
 135     return 1;
 136
 137   FILE *fp = fdopen (fd, "w+");
 138   if (fp == NULL)
 139     {
 140       printf ("seek_set: fopen: %s\n", strerror (errno));
 141       close (fd);
 142       return 1;
 143     }
 144
 145   if (do_seek_set (fp))
 146     {
 147       printf ("SEEK_SET test failed\n");
 148       ret = 1;
 149     }
 150
 151   /* Reopen the file.  */
 152   fclose (fp);
 153   fp = fopen (filename, "w+");
 154   if (fp == NULL)
 155     {
 156       printf ("seek_end: fopen: %s\n", strerror (errno));
 157       return 1;
 158     }
 159
 160   if (do_seek_end (fp))
 161     {
 162       printf ("SEEK_END test failed\n");
 163       ret = 1;
 164     }
 165
 166   fclose (fp);
 167
 168   return ret;
 169 }
 170
 171
 172 #define TEST_FUNCTION do_test ()
 173 #include "../test-skeleton.c"