[libc-commits] [libc] [libc] implement a64l (PR #128758)

[via libc-commits]

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@@ -0,0 +1,64 @@
+//===-- Implementation of a64l --------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/stdlib/a64l.h"
+#include "hdr/types/size_t.h"
+#include "src/__support/common.h"
+#include "src/__support/ctype_utils.h"
+#include "src/__support/macros/config.h"
+
+#include <stdint.h>
+
+namespace LIBC_NAMESPACE_DECL {
+
+// I'm not sure this should go in ctype_utils since the specific ordering of
+// base64 is so very implementation specific, and also this set is unusual.
+// Returns -1 on any char without a specified value.
+constexpr int32_t b64_char_to_int(char ch) {
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lntue wrote:

nit: mark this as static.

https://github.com/llvm/llvm-project/pull/128758