// Copyright (c) 2024 Google LLC

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//     http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include "source/to_string.h"

#include <cassert>

namespace spvtools {

std::string to_string(uint32_t n) {

  // This implementation avoids using standard library features that access

  // the locale.  Using the locale requires taking a mutex which causes

  // annoying serialization.

  constexpr int max_digits = 10;  // max uint has 10 digits

  // Contains the resulting digits, with least significant digit in the last

  // entry.

  char buf[max_digits];

  int write_index = max_digits - 1;

  if (n == 0) {

    buf[write_index] = '0';

  } else {

    while (n > 0) {

      int units = n % 10;

      buf[write_index--] = "0123456789"[units];

      n = (n - units) / 10;

    }

    write_index++;

  }

  assert(write_index >= 0);

  return std::string(buf + write_index, max_digits - write_index);

}

}  // namespace spvtools