131 lines
4.6 KiB
C
131 lines
4.6 KiB
C
/* Test of freading() function.
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Copyright (C) 2007-2021 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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/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
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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 "freading.h"
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#include <stdio.h>
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#include "macros.h"
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#define TESTFILE "t-freading.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. Write-only file is never reading. */
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fp = fopen (TESTFILE, "w");
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ASSERT (fp);
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ASSERT (!freading (fp));
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ASSERT (fwrite ("foobarsh", 1, 8, fp) == 8);
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ASSERT (!freading (fp));
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ASSERT (fclose (fp) == 0);
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/* Open it in read-only mode. Read-only file is always reading. */
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fp = fopen (TESTFILE, "r");
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ASSERT (fp);
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ASSERT (freading (fp));
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ASSERT (fgetc (fp) == 'f');
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ASSERT (freading (fp));
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ASSERT (fseek (fp, 2, SEEK_CUR) == 0);
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ASSERT (freading (fp));
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ASSERT (fgetc (fp) == 'b');
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ASSERT (freading (fp));
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fflush (fp);
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ASSERT (freading (fp));
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ASSERT (fgetc (fp) == 'a');
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ASSERT (freading (fp));
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ASSERT (fseek (fp, 0, SEEK_END) == 0);
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ASSERT (freading (fp));
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ASSERT (fclose (fp) == 0);
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/* Open it in read-write mode. POSIX requires a reposition (fseek,
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fsetpos, rewind) or EOF when transitioning from read to write;
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freading is only deterministic after input or output, but this
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test case should be portable even on open, after reposition, and
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at EOF. */
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/* First a scenario with only fgetc, fseek, fputc. */
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fp = fopen (TESTFILE, "r+");
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ASSERT (fp);
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ASSERT (!freading (fp));
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ASSERT (fgetc (fp) == 'f');
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ASSERT (freading (fp));
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ASSERT (fseek (fp, 2, SEEK_CUR) == 0);
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/* freading (fp) is undefined here, but fwriting (fp) is false. */
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ASSERT (fgetc (fp) == 'b');
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ASSERT (freading (fp));
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/* This fseek call is necessary when switching from reading to writing.
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See the description of fopen(), ISO C 99 7.19.5.3.(6). */
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ASSERT (fseek (fp, 0, SEEK_CUR) == 0);
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/* freading (fp) is undefined here, but fwriting (fp) is false. */
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ASSERT (fputc ('x', fp) == 'x');
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ASSERT (!freading (fp));
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ASSERT (fseek (fp, 0, SEEK_END) == 0);
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/* freading (fp) is undefined here, because on some implementations (e.g.
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glibc) fseek causes a buffer to be read.
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fwriting (fp) is undefined as well. */
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ASSERT (fclose (fp) == 0);
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/* Open it in read-write mode. POSIX requires a reposition (fseek,
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fsetpos, rewind) or EOF when transitioning from read to write;
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freading is only deterministic after input or output, but this
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test case should be portable even on open, after reposition, and
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at EOF. */
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/* Here a scenario that includes fflush. */
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fp = fopen (TESTFILE, "r+");
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ASSERT (fp);
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ASSERT (!freading (fp));
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ASSERT (fgetc (fp) == 'f');
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ASSERT (freading (fp));
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ASSERT (fseek (fp, 2, SEEK_CUR) == 0);
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/* freading (fp) is undefined here, but fwriting (fp) is false. */
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ASSERT (fgetc (fp) == 'b');
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ASSERT (freading (fp));
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fflush (fp);
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/* freading (fp) is undefined here, but fwriting (fp) is false. */
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ASSERT (fgetc (fp) == 'x');
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ASSERT (freading (fp));
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/* This fseek call is necessary when switching from reading to writing.
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See the description of fopen(), ISO C 99 7.19.5.3.(6). */
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ASSERT (fseek (fp, 0, SEEK_CUR) == 0);
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/* freading (fp) is undefined here, but fwriting (fp) is false. */
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ASSERT (fputc ('z', fp) == 'z');
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ASSERT (!freading (fp));
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ASSERT (fseek (fp, 0, SEEK_END) == 0);
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/* freading (fp) is undefined here, because on some implementations (e.g.
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glibc) fseek causes a buffer to be read.
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fwriting (fp) is undefined as well. */
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ASSERT (fclose (fp) == 0);
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/* Open it in append mode. Write-only file is never reading. */
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fp = fopen (TESTFILE, "a");
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ASSERT (fp);
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ASSERT (!freading (fp));
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ASSERT (fwrite ("bla", 1, 3, fp) == 3);
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ASSERT (!freading (fp));
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ASSERT (fclose (fp) == 0);
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ASSERT (remove (TESTFILE) == 0);
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return 0;
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}
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