67 lines · c
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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_LIBC_SRC_STDIO_PRINTF_CORE_STRING_CONVERTER_H10#define LLVM_LIBC_SRC_STDIO_PRINTF_CORE_STRING_CONVERTER_H11 12#include "src/__support/CPP/string_view.h"13#include "src/__support/macros/config.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#include <stddef.h>19 20namespace LIBC_NAMESPACE_DECL {21namespace printf_core {22 23template <WriteMode write_mode>24LIBC_INLINE int convert_string(Writer<write_mode> *writer,25 const FormatSection &to_conv) {26 size_t string_len = 0;27 const char *str_ptr = reinterpret_cast<const char *>(to_conv.conv_val_ptr);28 29#ifndef LIBC_COPT_PRINTF_NO_NULLPTR_CHECKS30 if (str_ptr == nullptr) {31 str_ptr = "(null)";32 }33#endif // LIBC_COPT_PRINTF_NO_NULLPTR_CHECKS34 35 for (const char *cur_str = (str_ptr); cur_str[string_len]; ++string_len) {36 ;37 }38 39 if (to_conv.precision >= 0 &&40 static_cast<size_t>(to_conv.precision) < string_len)41 string_len = to_conv.precision;42 43 size_t padding_spaces = to_conv.min_width > static_cast<int>(string_len)44 ? to_conv.min_width - string_len45 : 0;46 47 // If the padding is on the left side, write the spaces first.48 if (padding_spaces > 0 &&49 (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) == 0) {50 RET_IF_RESULT_NEGATIVE(writer->write(' ', padding_spaces));51 }52 53 RET_IF_RESULT_NEGATIVE(writer->write({(str_ptr), string_len}));54 55 // If the padding is on the right side, write the spaces last.56 if (padding_spaces > 0 &&57 (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) != 0) {58 RET_IF_RESULT_NEGATIVE(writer->write(' ', padding_spaces));59 }60 return WRITE_OK;61}62 63} // namespace printf_core64} // namespace LIBC_NAMESPACE_DECL65 66#endif // LLVM_LIBC_SRC_STDIO_PRINTF_CORE_STRING_CONVERTER_H67