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3f7df7e757
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org> Reviewed-by: Carlos O'Donell <carlos@redhat.com>
73 lines
2.2 KiB
C
73 lines
2.2 KiB
C
/* Test for ungetc bugs.
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Copyright (C) 1996-2024 Free Software Foundation, Inc.
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Copyright The GNU Toolchain Authors.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/xstdio.h>
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#include <support/xunistd.h>
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static int
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do_test (void)
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{
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char *name = NULL;
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FILE *fp = NULL;
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int c;
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char buffer[64];
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int fd = create_temp_file ("tst-ungetc.", &name);
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if (fd == -1)
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FAIL_EXIT1 ("cannot create temporary file: %m");
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xclose (fd);
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fp = xfopen (name, "w");
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fputs ("bla", fp);
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xfclose (fp);
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fp = xfopen (name, "r");
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TEST_VERIFY_EXIT (ungetc ('z', fp) == 'z');
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TEST_VERIFY_EXIT (getc (fp) == 'z');
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TEST_VERIFY_EXIT (getc (fp) == 'b');
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TEST_VERIFY_EXIT (getc (fp) == 'l');
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TEST_VERIFY_EXIT (ungetc ('m', fp) == 'm');
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TEST_VERIFY_EXIT (getc (fp) == 'm');
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TEST_VERIFY_EXIT ((c = getc (fp)) == 'a');
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TEST_VERIFY_EXIT (getc (fp) == EOF);
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TEST_VERIFY_EXIT (ungetc (c, fp) == c);
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TEST_VERIFY_EXIT (feof (fp) == 0);
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TEST_VERIFY_EXIT (getc (fp) == c);
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TEST_VERIFY_EXIT (getc (fp) == EOF);
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xfclose (fp);
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fp = xfopen (name, "r");
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TEST_VERIFY_EXIT (getc (fp) == 'b');
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TEST_VERIFY_EXIT (getc (fp) == 'l');
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TEST_VERIFY_EXIT (ungetc ('b', fp) == 'b');
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TEST_VERIFY_EXIT (fread (buffer, 1, 64, fp) == 2);
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TEST_VERIFY_EXIT (buffer[0] == 'b');
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TEST_VERIFY_EXIT (buffer[1] == 'a');
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xfclose (fp);
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return 0;
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}
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#include <support/test-driver.c>
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