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_STRING_CONVERTER_H 10 #define LLVM_LIBC_SRC_STDIO_PRINTF_CORE_STRING_CONVERTER_H 11 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 20 namespace LIBC_NAMESPACE_DECL { 21 namespace printf_core { 22 convert_string(Writer * writer,const FormatSection & to_conv)23LIBC_INLINE int convert_string(Writer *writer, const FormatSection &to_conv) { 24 size_t string_len = 0; 25 const char *str_ptr = reinterpret_cast<const char *>(to_conv.conv_val_ptr); 26 27 #ifndef LIBC_COPT_PRINTF_NO_NULLPTR_CHECKS 28 if (str_ptr == nullptr) { 29 str_ptr = "(null)"; 30 } 31 #endif // LIBC_COPT_PRINTF_NO_NULLPTR_CHECKS 32 33 for (const char *cur_str = (str_ptr); cur_str[string_len]; ++string_len) { 34 ; 35 } 36 37 if (to_conv.precision >= 0 && 38 static_cast<size_t>(to_conv.precision) < string_len) 39 string_len = to_conv.precision; 40 41 size_t padding_spaces = to_conv.min_width > static_cast<int>(string_len) 42 ? to_conv.min_width - string_len 43 : 0; 44 45 // If the padding is on the left side, write the spaces first. 46 if (padding_spaces > 0 && 47 (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) == 0) { 48 RET_IF_RESULT_NEGATIVE(writer->write(' ', padding_spaces)); 49 } 50 51 RET_IF_RESULT_NEGATIVE(writer->write({(str_ptr), string_len})); 52 53 // If the padding is on the right side, write the spaces last. 54 if (padding_spaces > 0 && 55 (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) != 0) { 56 RET_IF_RESULT_NEGATIVE(writer->write(' ', padding_spaces)); 57 } 58 return WRITE_OK; 59 } 60 61 } // namespace printf_core 62 } // namespace LIBC_NAMESPACE_DECL 63 64 #endif // LLVM_LIBC_SRC_STDIO_PRINTF_CORE_STRING_CONVERTER_H 65