libc/src/string/strncasecmp.cpp

   1 //===-- Implementation of strncasecmp -------------------------------------===//
   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/strncasecmp.h"
  10
  11 #include "src/__support/common.h"
  12 #include "src/__support/ctype_utils.h"
  13 #include "src/string/memory_utils/strcmp_implementations.h"
  14
  15 namespace __llvm_libc {
  16
  17 LLVM_LIBC_FUNCTION(int, strncasecmp,
  18                    (const char *left, const char *right, size_t n)) {
  19   auto case_cmp = [](char a, char b) {
  20     return __llvm_libc::internal::tolower(a) -
  21            __llvm_libc::internal::tolower(b);
  22   };
  23   return strncmp_implementation(left, right, n, case_cmp);
  24 }
  25
  26 } // namespace __llvm_libc