Blame lib/ftell.c

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/* An ftell() function that works around platform bugs.
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   Copyright (C) 2007-2018 Free Software Foundation, Inc.
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   This program is free software: you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
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#include <config.h>
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/* Specification.  */
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#include <stdio.h>
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#include <errno.h>
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#include <limits.h>
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long
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ftell (FILE *fp)
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{
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  /* Use the replacement ftello function with all its workarounds.  */
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  off_t offset = ftello (fp);
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  if (LONG_MIN <= offset && offset <= LONG_MAX)
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    return /* (long) */ offset;
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  else
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    {
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      errno = EOVERFLOW;
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      return -1;
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    }
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}