kc3-lang/gnulib/tests/test-fseek.c

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• Hash : 32a72f45
  Author :
  Date : 2023-01-01T01:14:21
  

  maint: run 'make update-copyright'
  

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• tests/test-fseek.c

• /* Test of fseek() function.
     Copyright (C) 2007-2023 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  
  #include <config.h>
  
  /* None of the files accessed by this test are large, so disable the
     fseek link warning if the user requested GNULIB_POSIXCHECK.  */
  #define _GL_NO_LARGE_FILES
  #include <stdio.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (fseek, int, (FILE *, long, int));
  
  #include "macros.h"
  
  #ifndef FUNC_UNGETC_BROKEN
  # define FUNC_UNGETC_BROKEN 0
  #endif
  
  int
  main (int argc, char **argv)
  {
    /* Assume stdin is non-empty, seekable, and starts with '#!/bin/sh'
       iff argc > 1.  */
    int expected = argc > 1 ? 0 : -1;
    ASSERT (fseek (stdin, 0, SEEK_CUR) == expected);
    if (argc > 1)
      {
        /* Test that fseek discards previously read ungetc data.  */
        int ch = fgetc (stdin);
        ASSERT (ch == '#');
        ASSERT (ungetc (ch, stdin) == ch);
        ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
        ch = fgetc (stdin);
        ASSERT (ch == '/');
        if (2 < argc)
          {
            if (FUNC_UNGETC_BROKEN)
              {
                fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
                       stderr);
                return 77;
              }
            /* Test that fseek discards random ungetc data.  */
            ASSERT (ungetc (ch ^ 0xff, stdin) == (ch ^ 0xff));
          }
        ASSERT (fseek (stdin, 0, SEEK_END) == 0);
        ASSERT (fgetc (stdin) == EOF);
        /* Test that fseek resets end-of-file marker.  */
        ASSERT (feof (stdin));
        ASSERT (fseek (stdin, 0, SEEK_END) == 0);
        ASSERT (!feof (stdin));
      }
    return 0;
  }
  

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