text: //===-- Implementation of toupper------------------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  
  #include "src/ctype/toupper.h"
  #include "src/__support/ctype_utils.h"
  
  #include "src/__support/common.h"
  
  namespace __llvm_libc {
  
  // TODO: Currently restricted to default locale.
  // These should be extended using locale information.
  LLVM_LIBC_FUNCTION(int, toupper, (int c)) {
    if (internal::islower(c))
      return c + 'A' - 'a';
    return c;
  }
  
  } // namespace __llvm_libc
  