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/* Test of ftell() function.
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Copyright (C) 2007-2015 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 <http://www.gnu.org/licenses/>. */
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#include <config.h>
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/* None of the files accessed by this test are large, so disable the
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fseek link warning if we are not using the gnulib fseek module. */
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#define _GL_NO_LARGE_FILES
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#include <stdio.h>
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#include <string.h>
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#include "macros.h"
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#define TESTFILE "t-ftell3.tmp"
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int
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main (void)
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{
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FILE *fp;
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/* Create a file with some contents. */
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fp = fopen (TESTFILE, "w");
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if (fp == NULL)
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goto skip;
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if (fwrite ("foogarsh", 1, 8, fp) < 8)
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goto skip;
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if (fclose (fp))
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goto skip;
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/* The file's contents is now "foogarsh". */
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/* Try writing after reading to EOF. */
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fp = fopen (TESTFILE, "r+");
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if (fp == NULL)
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goto skip;
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if (fseek (fp, -1, SEEK_END))
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goto skip;
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ASSERT (getc (fp) == 'h');
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ASSERT (getc (fp) == EOF);
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ASSERT (ftell (fp) == 8);
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ASSERT (ftell (fp) == 8);
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ASSERT (putc ('!', fp) == '!');
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ASSERT (ftell (fp) == 9);
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ASSERT (fclose (fp) == 0);
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fp = fopen (TESTFILE, "r");
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if (fp == NULL)
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goto skip;
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{
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char buf[10];
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ASSERT (fread (buf, 1, 10, fp) == 9);
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ASSERT (memcmp (buf, "foogarsh!", 9) == 0);
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}
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ASSERT (fclose (fp) == 0);
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/* The file's contents is now "foogarsh!". */
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remove (TESTFILE);
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return 0;
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skip:
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fprintf (stderr, "Skipping test: prerequisite file operations failed.\n");
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remove (TESTFILE);
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return 77;
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}
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