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/arg_list.h"
12 #include "src/stdio/printf_core/printf_main.h"
13 #include "src/stdio/printf_core/string_writer.h"
14 #include "src/stdio/printf_core/writer.h"
15 
16 #include <stdarg.h>
17 
18 namespace __llvm_libc {
19 
20 LLVM_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   printf_core::StringWriter str_writer(buffer);
30   printf_core::Writer writer(reinterpret_cast<void *>(&str_writer),
31                              printf_core::write_to_string);
32 
33   int ret_val = printf_core::printf_main(&writer, format, args);
34   str_writer.terminate();
35   return ret_val;
36 }
37 
38 } // namespace __llvm_libc
39