stdlib: Implement C2Y uabs, ulabs, ullabs and uimaxabs

C2Y adds unsigned versions of the abs functions (see C2Y draft N3467 and
proposal N3349).

Tested for x86_64.

Signed-off-by: Lenard Mollenkopf <glibc@lenardmollenkopf.de>

1 files changed, 33 insertions, 0 deletions

diff --git a/stdlib/ullabs.c b/stdlib/ullabs.c
new file mode 100644
index 0000000000..11268c29f4
--- /dev/null
+++ b/stdlib/ullabs.c
@@ -0,0 +1,33 @@
+/* Copyright (C) 2025 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 <limits.h>
+#include <stdlib.h>
+
+#undef	ullabs
+
+/* Return the absolute value of I.  */
+unsigned long long int
+ullabs (long long int i)
+{
+  unsigned long long int j = i;
+  return i < 0 ? -j : i;
+}
+
+#if ULONG_MAX == UINT_MAX
+weak_alias (ullabs, uimaxabs)
+#endif