kc3-lang/gnulib/tests/test-ftell3.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-ftell3.c

• /* Test of ftell() 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/>.  */
  
  #include <config.h>
  
  /* None of the files accessed by this test are large, so disable the
     fseek link warning if we are not using the gnulib fseek module.  */
  #define _GL_NO_LARGE_FILES
  #include <stdio.h>
  
  #include <string.h>
  
  #include "macros.h"
  
  #define TESTFILE "t-ftell3.tmp"
  
  int
  main (void)
  {
    FILE *fp;
  
    /* Create a file with some contents.  */
    fp = fopen (TESTFILE, "w");
    if (fp == NULL)
      goto skip;
    if (fwrite ("foogarsh", 1, 8, fp) < 8)
      goto skip;
    if (fclose (fp))
      goto skip;
  
    /* The file's contents is now "foogarsh".  */
  
    /* Try writing after reading to EOF.  */
    fp = fopen (TESTFILE, "r+");
    if (fp == NULL)
      goto skip;
    if (fseek (fp, -1, SEEK_END))
      goto skip;
    ASSERT (getc (fp) == 'h');
    ASSERT (getc (fp) == EOF);
    ASSERT (ftell (fp) == 8);
    ASSERT (ftell (fp) == 8);
    ASSERT (putc ('!', fp) == '!');
    ASSERT (ftell (fp) == 9);
    ASSERT (fclose (fp) == 0);
    fp = fopen (TESTFILE, "r");
    if (fp == NULL)
      goto skip;
    {
      char buf[10];
      ASSERT (fread (buf, 1, 10, fp) == 9);
      ASSERT (memcmp (buf, "foogarsh!", 9) == 0);
    }
    ASSERT (fclose (fp) == 0);
  
    /* The file's contents is now "foogarsh!".  */
  
    remove (TESTFILE);
    return 0;
  
   skip:
    fprintf (stderr, "Skipping test: prerequisite file operations failed.\n");
    remove (TESTFILE);
    return 77;
  }
  

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