1  /* An ftell() function that works around platform bugs.
       2     Copyright (C) 2007-2021 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 <https://www.gnu.org/licenses/>.  */
      16  
      17  #include <config.h>
      18  
      19  /* Specification.  */
      20  #include <stdio.h>
      21  
      22  #include <errno.h>
      23  #include <limits.h>
      24  
      25  long
      26  ftell (FILE *fp)
      27  {
      28    /* Use the replacement ftello function with all its workarounds.  */
      29    off_t offset = ftello (fp);
      30    if (LONG_MIN <= offset && offset <= LONG_MAX)
      31      return /* (long) */ offset;
      32    else
      33      {
      34        errno = EOVERFLOW;
      35        return -1;
      36      }
      37  }