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/* 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/>. */
/* 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 we are not using the gnulib fseek module. */
#define _GL_NO_LARGE_FILES
#include <stdio.h>
#include "signature.h"
SIGNATURE_CHECK (ftell, long, (FILE *));
#include "binary-io.h"
#include "macros.h"
#ifndef FUNC_UNGETC_BROKEN
# define FUNC_UNGETC_BROKEN 0
#endif
int
main (int argc, char **argv)
{
int ch;
/* Assume stdin is seekable iff argc > 1. */
if (argc == 1)
{
ASSERT (ftell (stdin) == -1);
return 0;
}
/* mingw ftell is unreliable on text mode input. */
set_binary_mode (0, O_BINARY);
/* Simple tests. */
ASSERT (ftell (stdin) == 0);
ch = fgetc (stdin);
ASSERT (ch == '#');
ASSERT (ftell (stdin) == 1);
/* Test ftell after ungetc of read input. */
ch = ungetc ('#', stdin);
ASSERT (ch == '#');
ASSERT (ftell (stdin) == 0);
ch = fgetc (stdin);
ASSERT (ch == '#');
ASSERT (ftell (stdin) == 1);
/* Test ftell after fseek. */
ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
ASSERT (ftell (stdin) == 2);
/* Test ftell after random ungetc. */
ch = fgetc (stdin);
ASSERT (ch == '/');
ch = ungetc ('@', stdin);
ASSERT (ch == '@');
ASSERT (ftell (stdin) == 2);
ch = fgetc (stdin);
ASSERT (ch == '@');
ASSERT (ftell (stdin) == 3);
if (2 < argc)
{
if (FUNC_UNGETC_BROKEN)
{
fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
stderr);
return 77;
}
/* Test ftell after ungetc without read. */
ASSERT (fseek (stdin, 0, SEEK_CUR) == 0);
ASSERT (ftell (stdin) == 3);
ch = ungetc ('~', stdin);
ASSERT (ch == '~');
ASSERT (ftell (stdin) == 2);
}
#if !defined __MINT__ /* FreeMiNT has problems seeking past end of file */
/* Test ftell beyond end of file. */
ASSERT (fseek (stdin, 0, SEEK_END) == 0);
ch = ftell (stdin);
ASSERT (fseek (stdin, 10, SEEK_END) == 0);
ASSERT (ftell (stdin) == ch + 10);
#endif
return 0;
}
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