Branch data     Line data    Source code

       1                 :            : /* Test of fseeko() function.
       2                 :            :    Copyright (C) 2007-2012 Free Software Foundation, Inc.
       3                 :            : 
       4                 :            :    This program is free software: you can redistribute it and/or modify
       5                 :            :    it under the terms of the GNU General Public License as published by
       6                 :            :    the Free Software Foundation; either version 3 of the License, or
       7                 :            :    (at your option) any later version.
       8                 :            : 
       9                 :            :    This program is distributed in the hope that it will be useful,
      10                 :            :    but WITHOUT ANY WARRANTY; without even the implied warranty of
      11                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12                 :            :    GNU General Public License for more details.
      13                 :            : 
      14                 :            :    You should have received a copy of the GNU General Public License
      15                 :            :    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
      16                 :            : 
      17                 :            : /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
      18                 :            : 
      19                 :            : #include <config.h>
      20                 :            : 
      21                 :            : /* None of the files accessed by this test are large, so disable the
      22                 :            :    fseek link warning if we are not using the gnulib fseek module.  */
      23                 :            : #define _GL_NO_LARGE_FILES
      24                 :            : #include <stdio.h>
      25                 :            : 
      26                 :            : #include "signature.h"
      27                 :            : SIGNATURE_CHECK (fseeko, int, (FILE *, off_t, int));
      28                 :            : 
      29                 :            : 
      30                 :            : #include "macros.h"
      31                 :            : 
      32                 :            : #ifndef FUNC_UNGETC_BROKEN
      33                 :            : # define FUNC_UNGETC_BROKEN 0
      34                 :            : #endif
      35                 :            : 
      36                 :            : int
      37                 :          3 : main (int argc, char **argv _GL_UNUSED)
      38                 :            : {
      39                 :            :   /* Assume stdin is non-empty, seekable, and starts with '#!/bin/sh'
      40                 :            :      iff argc > 1.  */
      41         [ +  + ]:          3 :   int expected = argc > 1 ? 0 : -1;
      42                 :            :   /* Exit with success only if fseek/fseeko agree.  */
      43                 :          3 :   int r1 = fseeko (stdin, 0, SEEK_CUR);
      44                 :          3 :   int r2 = fseek (stdin, 0, SEEK_CUR);
      45 [ +  - ][ -  + ]:          3 :   ASSERT (r1 == r2 && r1 == expected);
      46         [ +  + ]:          3 :   if (argc > 1)
      47                 :            :     {
      48                 :            :       /* Test that fseek discards previously read ungetc data.  */
      49                 :          2 :       int ch = fgetc (stdin);
      50         [ -  + ]:          2 :       ASSERT (ch == '#');
      51         [ -  + ]:          2 :       ASSERT (ungetc (ch, stdin) == ch);
      52         [ -  + ]:          2 :       ASSERT (fseeko (stdin, 2, SEEK_SET) == 0);
      53                 :          2 :       ch = fgetc (stdin);
      54         [ -  + ]:          2 :       ASSERT (ch == '/');
      55         [ +  + ]:          2 :       if (2 < argc)
      56                 :            :         {
      57                 :            :           if (FUNC_UNGETC_BROKEN)
      58                 :            :             {
      59                 :            :               fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
      60                 :            :                      stderr);
      61                 :            :               return 77;
      62                 :            :             }
      63                 :            :           /* Test that fseek discards random ungetc data.  */
      64         [ -  + ]:          1 :           ASSERT (ungetc (ch ^ 0xff, stdin) == (ch ^ 0xff));
      65                 :            :         }
      66         [ -  + ]:          2 :       ASSERT (fseeko (stdin, 0, SEEK_END) == 0);
      67         [ -  + ]:          2 :       ASSERT (fgetc (stdin) == EOF);
      68                 :            :       /* Test that fseek resets end-of-file marker.  */
      69         [ -  + ]:          2 :       ASSERT (feof (stdin));
      70         [ -  + ]:          2 :       ASSERT (fseeko (stdin, 0, SEEK_END) == 0);
      71         [ -  + ]:          2 :       ASSERT (!feof (stdin));
      72                 :            :     }
      73                 :          3 :   return 0;
      74                 :            : }