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