1//===-- Implementation of strfroml ------------------------------*- 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#include "src/stdlib/strfroml.h"
10#include "src/stdlib/str_from_util.h"
11
12namespace LIBC_NAMESPACE {
13
14LLVM_LIBC_FUNCTION(int, strfroml,
15 (char *__restrict s, size_t n, const char *__restrict format,
16 long double fp)) {
17 LIBC_ASSERT(s != nullptr);
18
19 printf_core::FormatSection section =
20 internal::parse_format_string(format, fp);
21
22 // To ensure that the conversion function actually uses long double,
23 // the length modifier has to be set to LenghtModifier::L
24 section.length_modifier = printf_core::LengthModifier::L;
25
26 printf_core::WriteBuffer wb(s, (n > 0 ? n - 1 : 0));
27 printf_core::Writer writer(&wb);
28
29 int result = 0;
30 if (section.has_conv)
31 result = internal::strfromfloat_convert<long double>(writer: &writer, section);
32 else
33 result = writer.write(new_string: section.raw_string);
34
35 if (result < 0)
36 return result;
37
38 if (n > 0)
39 wb.buff[wb.buff_cur] = '\0';
40
41 return writer.get_chars_written();
42}
43
44} // namespace LIBC_NAMESPACE
45

source code of libc/src/stdlib/strfroml.cpp