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/CPP/bitset.h" 12 #include "src/__support/common.h" 13 #include "src/__support/macros/config.h" 14 #include <stddef.h> 15 16 namespace LIBC_NAMESPACE_DECL { 17 18 LLVM_LIBC_FUNCTION(size_t, strspn, (const char *src, const char *segment)) { 19 const char *initial = src; 20 cpp::bitset<256> bitset; 21 22 for (; *segment; ++segment) 23 bitset.set(*reinterpret_cast<const unsigned char *>(segment)); 24 for (; *src && bitset.test(*reinterpret_cast<const unsigned char *>(src)); 25 ++src) 26 ; 27 return src - initial; 28 } 29 30 } // namespace LIBC_NAMESPACE_DECL 31