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 <stddef.h> 14 15 namespace LIBC_NAMESPACE { 16 17 LLVM_LIBC_FUNCTION(size_t, 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(*reinterpret_cast<const unsigned char *>(segment)); 23 for (; *src && bitset.test(*reinterpret_cast<const unsigned char *>(src)); 24 ++src) 25 ; 26 return src - initial; 27 } 28 29 } // namespace LIBC_NAMESPACE 30