Add the wcslcpy, wcslcat functions

These functions are about to be added to POSIX, under Austin Group
issue 986.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 93 insertions, 0 deletions

diff --git a/wcsmbs/tst-wcslcat.c b/wcsmbs/tst-wcslcat.c
new file mode 100644
index 0000000..63c3a16
--- /dev/null
+++ b/wcsmbs/tst-wcslcat.c
@@ -0,0 +1,93 @@
+/* Test the wcslcat 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 <array_length.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <support/check.h>
+#include <wchar.h>
+
+static int
+do_test (void)
+{
+  struct {
+    wchar_t buf1[16];
+    wchar_t buf2[16];
+  } s;
+
+  /* Nothing is written to the destination if its size is 0.  */
+  wmemset (s.buf1, '@', array_length (s.buf1));
+  wmemset (s.buf2, '@', array_length (s.buf2));
+  TEST_COMPARE (wcslcat (s.buf1, L"", 0), 0);
+  TEST_COMPARE_BLOB (&s, sizeof (s), L"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
+  TEST_COMPARE (wcslcat (s.buf1, L"Hello!", 0), 6);
+  TEST_COMPARE_BLOB (&s, sizeof (s), L"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
+
+  /* No bytes are are modified in the target buffer if the source
+     string is short enough.  */
+  wmemset (s.buf1, '@', array_length (s.buf1));
+  wmemset (s.buf2, '@', array_length (s.buf2));
+  wcscpy (s.buf1, L"He");
+  TEST_COMPARE (wcslcat (s.buf1, L"llo!", array_length (s.buf1)), 6);
+  TEST_COMPARE_BLOB (&s, sizeof (s), L"Hello!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
+
+  /* A source string which fits exactly into the destination buffer is
+     not truncated.  */
+  wmemset (s.buf1, '@', array_length (s.buf1));
+  wmemset (s.buf2, '@', array_length (s.buf2));
+  wcscpy (s.buf1, L"H");
+  TEST_COMPARE (wcslcat (s.buf1, L"ello, world!!!", array_length (s.buf1)),
+                15);
+  TEST_COMPARE_BLOB (&s, sizeof (s),
+		     L"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
+
+  /* A source string one character longer than the destination buffer
+     is truncated by one character.  The total length is returned.  */
+  wmemset (s.buf1, '@', array_length (s.buf1));
+  wmemset (s.buf2, '@', array_length (s.buf2));
+  wcscpy (s.buf1, L"Hello");
+  TEST_COMPARE (wcslcat (s.buf1, L", world!!!!", array_length (s.buf1)), 16);
+  TEST_COMPARE_BLOB (&s, sizeof (s),
+		     L"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
+
+  /* An even longer source string is truncated as well, and the total
+     length is returned.  */
+  wmemset (s.buf1, '@', array_length (s.buf1));
+  wmemset (s.buf2, '@', array_length (s.buf2));
+  wcscpy (s.buf1, L"Hello,");
+  TEST_COMPARE (wcslcat (s.buf1, L" world!!!!!!!!", array_length (s.buf1)),
+                20);
+  TEST_COMPARE_BLOB (&s, sizeof (s),
+		     L"Hello, world!!!\0@@@@@@@@@@@@@@@@@@@@@@@@@", 128);
+
+  /* A destination string which is not NUL-terminated does not result
+     in any changes to the buffer.  */
+  wmemset (s.buf1, '$', array_length (s.buf1));
+  wmemset (s.buf2, '@', array_length (s.buf2));
+  TEST_COMPARE (wcslcat (s.buf1, L"", array_length (s.buf1)), 16);
+  TEST_COMPARE_BLOB (&s, sizeof (s), L"$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 128);
+  TEST_COMPARE (wcslcat (s.buf1, L"Hello!", array_length (s.buf1)), 22);
+  TEST_COMPARE_BLOB (&s, sizeof (s), L"$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 128);
+  TEST_COMPARE (wcslcat (s.buf1, L"Hello, world!!!!!!!!",
+                         array_length (s.buf1)), 36);
+  TEST_COMPARE_BLOB (&s, sizeof (s), L"$$$$$$$$$$$$$$$$@@@@@@@@@@@@@@@@", 128);
+
+  return 0;
+}
+
+#include <support/test-driver.c>