libc/src/stdio/printf_core/char_converter.h

   1 //===-- String Converter for printf -----------------------------*- C++ -*-===//
   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 #ifndef LLVM_LIBC_SRC_STDIO_PRINTF_CORE_CHAR_CONVERTER_H
  10 #define LLVM_LIBC_SRC_STDIO_PRINTF_CORE_CHAR_CONVERTER_H
  11
  12 #include "src/__support/CPP/string_view.h"
  13 #include "src/__support/common.h"
  14 #include "src/stdio/printf_core/converter_utils.h"
  15 #include "src/stdio/printf_core/core_structs.h"
  16 #include "src/stdio/printf_core/writer.h"
  17
  18 namespace __llvm_libc {
  19 namespace printf_core {
  20
  21 LIBC_INLINE int convert_char(Writer *writer, const FormatSection &to_conv) {
  22   char c = static_cast<char>(to_conv.conv_val_raw);
  23
  24   constexpr int string_len = 1;
  25
  26   size_t padding_spaces =
  27       to_conv.min_width > string_len ? to_conv.min_width - string_len : 0;
  28
  29   // If the padding is on the left side, write the spaces first.
  30   if (padding_spaces > 0 &&
  31       (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) == 0) {
  32     RET_IF_RESULT_NEGATIVE(writer->write(' ', padding_spaces));
  33   }
  34
  35   RET_IF_RESULT_NEGATIVE(writer->write(c));
  36
  37   // If the padding is on the right side, write the spaces last.
  38   if (padding_spaces > 0 &&
  39       (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) != 0) {
  40     RET_IF_RESULT_NEGATIVE(writer->write(' ', padding_spaces));
  41   }
  42
  43   return WRITE_OK;
  44 }
  45
  46 } // namespace printf_core
  47 } // namespace __llvm_libc
  48
  49 #endif // LLVM_LIBC_SRC_STDIO_PRINTF_CORE_CHAR_CONVERTER_H