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85 lines
3.3 KiB
C
85 lines
3.3 KiB
C
/* Test the strlcat function.
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Copyright (C) 2023-2025 Free Software Foundation, Inc.
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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 <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <support/check.h>
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static int
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do_test (void)
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{
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struct {
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char buf1[16];
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char buf2[16];
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} s;
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/* Nothing is written to the destination if its size is 0. */
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memset (&s, '@', sizeof (s));
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TEST_COMPARE (strlcat (s.buf1, "", 0), 0);
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TEST_COMPARE_BLOB (&s, sizeof (s), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
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TEST_COMPARE (strlcat (s.buf1, "Hello!", 0), 6);
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TEST_COMPARE_BLOB (&s, sizeof (s), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
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/* No bytes are are modified in the target buffer if the source
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string is short enough. */
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memset (&s, '@', sizeof (s));
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strcpy (s.buf1, "He");
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TEST_COMPARE (strlcat (s.buf1, "llo!", sizeof (s.buf1)), 6);
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TEST_COMPARE_BLOB (&s, sizeof (s), "Hello!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
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/* A source string which fits exactly into the destination buffer is
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not truncated. */
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memset (&s, '@', sizeof (s));
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strcpy (s.buf1, "H");
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TEST_COMPARE (strlcat (s.buf1, "ello, world!!!", sizeof (s.buf1)), 15);
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TEST_COMPARE_BLOB (&s, sizeof (s),
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"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
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/* A source string one character longer than the destination buffer
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is truncated by one character. The total length is returned. */
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memset (&s, '@', sizeof (s));
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strcpy (s.buf1, "Hello");
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TEST_COMPARE (strlcat (s.buf1, ", world!!!!", sizeof (s.buf1)), 16);
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TEST_COMPARE_BLOB (&s, sizeof (s),
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"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
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/* An even longer source string is truncated as well, and the total
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length is returned. */
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memset (&s, '@', sizeof (s));
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strcpy (s.buf1, "Hello,");
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TEST_COMPARE (strlcat (s.buf1, " world!!!!!!!!", sizeof (s.buf1)), 20);
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TEST_COMPARE_BLOB (&s, sizeof (s),
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"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
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/* A destination string which is not NUL-terminated does not result
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in any changes to the buffer. */
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memset (&s, '@', sizeof (s));
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memset (s.buf1, '$', sizeof (s.buf1));
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TEST_COMPARE (strlcat (s.buf1, "", sizeof (s.buf1)), 16);
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TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 32);
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TEST_COMPARE (strlcat (s.buf1, "Hello!", sizeof (s.buf1)), 22);
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TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 32);
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TEST_COMPARE (strlcat (s.buf1, "Hello, world!!!!!!!!", sizeof (s.buf1)), 36);
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TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 32);
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return 0;
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}
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#include <support/test-driver.c>
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