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
19namespace LIBC_NAMESPACE {
20namespace printf_core {
21
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

source code of libc/src/stdio/printf_core/string_converter.h