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/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 #include <stddef.h> 18 19 namespace LIBC_NAMESPACE { 20 namespace printf_core { 21 convert_string(Writer * writer,const FormatSection & to_conv)22LIBC_INLINE int convert_string(Writer *writer, const FormatSection &to_conv) { 23 size_t string_len = 0; 24 const char *str_ptr = reinterpret_cast<const char *>(to_conv.conv_val_ptr); 25 26 #ifndef LIBC_COPT_PRINTF_NO_NULLPTR_CHECKS 27 if (str_ptr == nullptr) { 28 str_ptr = "(null)"; 29 } 30 #endif // LIBC_COPT_PRINTF_NO_NULLPTR_CHECKS 31 32 for (const char *cur_str = (str_ptr); cur_str[string_len]; ++string_len) { 33 ; 34 } 35 36 if (to_conv.precision >= 0 && 37 static_cast<size_t>(to_conv.precision) < string_len) 38 string_len = to_conv.precision; 39 40 size_t padding_spaces = to_conv.min_width > static_cast<int>(string_len) 41 ? to_conv.min_width - string_len 42 : 0; 43 44 // If the padding is on the left side, write the spaces first. 45 if (padding_spaces > 0 && 46 (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) == 0) { 47 RET_IF_RESULT_NEGATIVE(writer->write(' ', padding_spaces)); 48 } 49 50 RET_IF_RESULT_NEGATIVE(writer->write({(str_ptr), string_len})); 51 52 // If the padding is on the right side, write the spaces last. 53 if (padding_spaces > 0 && 54 (to_conv.flags & FormatFlags::LEFT_JUSTIFIED) != 0) { 55 RET_IF_RESULT_NEGATIVE(writer->write(' ', padding_spaces)); 56 } 57 return WRITE_OK; 58 } 59 60 } // namespace printf_core 61 } // namespace LIBC_NAMESPACE 62 63 #endif // LLVM_LIBC_SRC_STDIO_PRINTF_CORE_STRING_CONVERTER_H 64