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/__support/macros/config.h"
11#include "src/stdlib/str_from_util.h"
12
13namespace LIBC_NAMESPACE_DECL {
14
15LLVM_LIBC_FUNCTION(int, strfroml,
16 (char *__restrict s, size_t n, const char *__restrict format,
17 long double fp)) {
18 LIBC_ASSERT(s != nullptr);
19
20 printf_core::FormatSection section =
21 internal::parse_format_string(format, fp);
22
23 // To ensure that the conversion function actually uses long double,
24 // the length modifier has to be set to LenghtModifier::L
25 section.length_modifier = printf_core::LengthModifier::L;
26
27 printf_core::WriteBuffer<printf_core::Mode<
28 printf_core::WriteMode::FILL_BUFF_AND_DROP_OVERFLOW>::value>
29 wb(s, (n > 0 ? n - 1 : 0));
30 printf_core::Writer writer(wb);
31
32 int result = 0;
33 if (section.has_conv)
34 result = internal::strfromfloat_convert<long double>(&writer, section);
35 else
36 result = writer.write(section.raw_string);
37
38 if (result < 0)
39 return result;
40
41 if (n > 0)
42 wb.buff[wb.buff_cur] = '\0';
43
44 return writer.get_chars_written();
45}
46
47} // namespace LIBC_NAMESPACE_DECL
48

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