1//===-- Implementation of sprintf -------------------------------*- 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/stdio/sprintf.h"
10
11#include "src/__support/CPP/limits.h"
12#include "src/__support/arg_list.h"
13#include "src/stdio/printf_core/printf_main.h"
14#include "src/stdio/printf_core/writer.h"
15
16#include <stdarg.h>
17
18namespace LIBC_NAMESPACE {
19
20LLVM_LIBC_FUNCTION(int, sprintf,
21 (char *__restrict buffer, const char *__restrict format,
22 ...)) {
23 va_list vlist;
24 va_start(vlist, format);
25 internal::ArgList args(vlist); // This holder class allows for easier copying
26 // and pointer semantics, as well as handling
27 // destruction automatically.
28 va_end(vlist);
29
30 printf_core::WriteBuffer wb(buffer, cpp::numeric_limits<size_t>::max());
31 printf_core::Writer writer(&wb);
32
33 int ret_val = printf_core::printf_main(writer: &writer, str: format, args);
34 wb.buff[wb.buff_cur] = '\0';
35 return ret_val;
36}
37
38} // namespace LIBC_NAMESPACE
39

source code of libc/src/stdio/sprintf.cpp