1 // Copyright 2017 The Abseil Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #include "absl/strings/internal/memutil.h" 16 17 #include <cstdlib> 18 19 #include "absl/strings/ascii.h" 20 21 namespace absl { 22 ABSL_NAMESPACE_BEGIN 23 namespace strings_internal { 24 memcasecmp(const char * s1,const char * s2,size_t len)25int memcasecmp(const char* s1, const char* s2, size_t len) { 26 const unsigned char* us1 = reinterpret_cast<const unsigned char*>(s1); 27 const unsigned char* us2 = reinterpret_cast<const unsigned char*>(s2); 28 29 for (size_t i = 0; i < len; i++) { 30 const int diff = 31 int{static_cast<unsigned char>(absl::ascii_tolower(us1[i]))} - 32 int{static_cast<unsigned char>(absl::ascii_tolower(us2[i]))}; 33 if (diff != 0) return diff; 34 } 35 return 0; 36 } 37 38 } // namespace strings_internal 39 ABSL_NAMESPACE_END 40 } // namespace absl 41