1 //===-- Implementation of strspn ------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "src/string/strspn.h"
10 
11 #include "src/__support/common.h"
12 #include "utils/CPP/Bitset.h"
13 #include <stddef.h>
14 
15 namespace __llvm_libc {
16 
LLVM_LIBC_ENTRYPOINT(strspn)17 size_t LLVM_LIBC_ENTRYPOINT(strspn)(const char *src, const char *segment) {
18   const char *initial = src;
19   cpp::Bitset<256> bitset;
20 
21   for (; *segment; ++segment)
22     bitset.set(*segment);
23   for (; *src && bitset.test(*src); ++src)
24     ;
25   return src - initial;
26 }
27 
28 } // namespace __llvm_libc
29