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       1                 :            : /* Test of fseek() 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 the user requested GNULIB_POSIXCHECK.  */
      23                 :            : #define _GL_NO_LARGE_FILES
      24                 :            : #include <stdio.h>
      25                 :            : 
      26                 :            : #include "signature.h"
      27                 :            : SIGNATURE_CHECK (fseek, int, (FILE *, long, int));
      28                 :            : 
      29                 :            : #include "macros.h"
      30                 :            : 
      31                 :            : #ifndef FUNC_UNGETC_BROKEN
      32                 :            : # define FUNC_UNGETC_BROKEN 0
      33                 :            : #endif
      34                 :            : 
      35                 :            : int
      36                 :          3 : main (int argc, char **argv)
      37                 :            : {
      38                 :            :   /* Assume stdin is non-empty, seekable, and starts with '#!/bin/sh'
      39                 :            :      iff argc > 1.  */
      40         [ +  + ]:          3 :   int expected = argc > 1 ? 0 : -1;
      41         [ -  + ]:          3 :   ASSERT (fseek (stdin, 0, SEEK_CUR) == expected);
      42         [ +  + ]:          3 :   if (argc > 1)
      43                 :            :     {
      44                 :            :       /* Test that fseek discards previously read ungetc data.  */
      45                 :          2 :       int ch = fgetc (stdin);
      46         [ -  + ]:          2 :       ASSERT (ch == '#');
      47         [ -  + ]:          2 :       ASSERT (ungetc (ch, stdin) == ch);
      48         [ -  + ]:          2 :       ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
      49                 :          2 :       ch = fgetc (stdin);
      50         [ -  + ]:          2 :       ASSERT (ch == '/');
      51         [ +  + ]:          2 :       if (2 < argc)
      52                 :            :         {
      53                 :            :           if (FUNC_UNGETC_BROKEN)
      54                 :            :             {
      55                 :            :               fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
      56                 :            :                      stderr);
      57                 :            :               return 77;
      58                 :            :             }
      59                 :            :           /* Test that fseek discards random ungetc data.  */
      60         [ -  + ]:          1 :           ASSERT (ungetc (ch ^ 0xff, stdin) == (ch ^ 0xff));
      61                 :            :         }
      62         [ -  + ]:          2 :       ASSERT (fseek (stdin, 0, SEEK_END) == 0);
      63         [ -  + ]:          2 :       ASSERT (fgetc (stdin) == EOF);
      64                 :            :       /* Test that fseek resets end-of-file marker.  */
      65         [ -  + ]:          2 :       ASSERT (feof (stdin));
      66         [ -  + ]:          2 :       ASSERT (fseek (stdin, 0, SEEK_END) == 0);
      67         [ -  + ]:          2 :       ASSERT (!feof (stdin));
      68                 :            :     }
      69                 :          3 :   return 0;
      70                 :            : }