libc/src/stdio/printf_core/char_converter.h

//===-- String Converter for printf -----------------------------*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_LIBC_SRC_STDIO_PRINTF_CORE_CHAR_CONVERTER_H
#define LLVM_LIBC_SRC_STDIO_PRINTF_CORE_CHAR_CONVERTER_H

#include "src/__support/CPP/string_view.h"
#include "src/stdio/printf_core/converter_utils.h"
#include "src/stdio/printf_core/core_structs.h"
#include "src/stdio/printf_core/writer.h"

namespace __llvm_libc {
namespace printf_core {

int inline convert_char(Writer *writer, const FormatSection &to_conv) {
  char c = to_conv.conv_val_raw;

  constexpr int string_len = 1;

  size_t padding_spaces =
      to_conv.min_width > string_len ? to_conv.min_width - string_len : 0;

  // If the padding is on the left side, write the spaces first.
  if (padding_spaces > 0 &&
      (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) == 0) {
    RET_IF_RESULT_NEGATIVE(writer->write(' ', to_conv.min_width - string_len));
  }

  RET_IF_RESULT_NEGATIVE(writer->write(c));

  // If the padding is on the right side, write the spaces last.
  if (padding_spaces > 0 &&
      (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) != 0) {
    RET_IF_RESULT_NEGATIVE(writer->write(' ', to_conv.min_width - string_len));
  }

  return WRITE_OK;
}

} // namespace printf_core
} // namespace __llvm_libc

#endif // LLVM_LIBC_SRC_STDIO_PRINTF_CORE_CHAR_CONVERTER_H