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//===-- Implementation of strspn ------------------------------------------===//
//
// 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/string/strspn.h"
#include "src/__support/CPP/bitset.h"
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/null_check.h"
#include <stddef.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(size_t, strspn, (const char *src, const char *segment)) {
LIBC_CRASH_ON_NULLPTR(src);
LIBC_CRASH_ON_NULLPTR(segment);
const char *initial = src;
cpp::bitset<256> bitset;
for (; *segment; ++segment)
bitset.set(*reinterpret_cast<const unsigned char *>(segment));
for (; *src && bitset.test(*reinterpret_cast<const unsigned char *>(src));
++src)
;
return src - initial;
}
} // namespace LIBC_NAMESPACE_DECL
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