llvm-project/flang/runtime/command.cpp

//===-- runtime/command.cpp -----------------------------------------------===//
//
// 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 "flang/Runtime/command.h"
#include "environment.h"
#include <limits>

namespace Fortran::runtime {
std::int32_t RTNAME(ArgumentCount)() {
  int argc{executionEnvironment.argc};
  if (argc > 1) {
    // C counts the command name as one of the arguments, but Fortran doesn't.
    return argc - 1;
  }
  return 0;
}

std::int64_t RTNAME(ArgumentLength)(std::int32_t n) {
  if (n < 0 || n >= executionEnvironment.argc) {
    return 0;
  }

  std::size_t length{std::strlen(executionEnvironment.argv[n])};
  if constexpr (sizeof(std::size_t) <= sizeof(std::int64_t)) {
    return static_cast<std::int64_t>(length);
  } else {
    std::size_t max{std::numeric_limits<std::int64_t>::max()};
    return length > max ? 0 // Just fail.
                        : static_cast<std::int64_t>(length);
  }
}
} // namespace Fortran::runtime