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/* Test the strlcat function.
Copyright (C) 2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <support/check.h>
static int
do_test (void)
{
struct {
char buf1[16];
char buf2[16];
} s;
/* Nothing is written to the destination if its size is 0. */
memset (&s, '@', sizeof (s));
TEST_COMPARE (strlcat (s.buf1, "", 0), 0);
TEST_COMPARE_BLOB (&s, sizeof (s), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
TEST_COMPARE (strlcat (s.buf1, "Hello!", 0), 6);
TEST_COMPARE_BLOB (&s, sizeof (s), "@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
/* No bytes are are modified in the target buffer if the source
string is short enough. */
memset (&s, '@', sizeof (s));
strcpy (s.buf1, "He");
TEST_COMPARE (strlcat (s.buf1, "llo!", sizeof (s.buf1)), 6);
TEST_COMPARE_BLOB (&s, sizeof (s), "Hello!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
/* A source string which fits exactly into the destination buffer is
not truncated. */
memset (&s, '@', sizeof (s));
strcpy (s.buf1, "H");
TEST_COMPARE (strlcat (s.buf1, "ello, world!!!", sizeof (s.buf1)), 15);
TEST_COMPARE_BLOB (&s, sizeof (s),
"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
/* A source string one character longer than the destination buffer
is truncated by one character. The total length is returned. */
memset (&s, '@', sizeof (s));
strcpy (s.buf1, "Hello");
TEST_COMPARE (strlcat (s.buf1, ", world!!!!", sizeof (s.buf1)), 16);
TEST_COMPARE_BLOB (&s, sizeof (s),
"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
/* An even longer source string is truncated as well, and the total
length is returned. */
memset (&s, '@', sizeof (s));
strcpy (s.buf1, "Hello,");
TEST_COMPARE (strlcat (s.buf1, " world!!!!!!!!", sizeof (s.buf1)), 20);
TEST_COMPARE_BLOB (&s, sizeof (s),
"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 32);
/* A destination string which is not NUL-terminated does not result
in any changes to the buffer. */
memset (&s, '@', sizeof (s));
memset (s.buf1, '$', sizeof (s.buf1));
TEST_COMPARE (strlcat (s.buf1, "", sizeof (s.buf1)), 16);
TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 32);
TEST_COMPARE (strlcat (s.buf1, "Hello!", sizeof (s.buf1)), 22);
TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 32);
TEST_COMPARE (strlcat (s.buf1, "Hello, world!!!!!!!!", sizeof (s.buf1)), 36);
TEST_COMPARE_BLOB (&s, sizeof (s), "$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 32);
return 0;
}
#include <support/test-driver.c>
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