blob: b07a2499a0dd3d6c45c9ab9015f462af3fa5e0a4 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
//===-- Implementation of vsnprintf -----------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/stdio/vsnprintf.h"
#include "src/__support/arg_list.h"
#include "src/__support/macros/config.h"
#include "src/stdio/printf_core/printf_main.h"
#include "src/stdio/printf_core/writer.h"
#include <stdarg.h>
#include <stddef.h>
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(int, vsnprintf,
(char *__restrict buffer, size_t buffsz,
const char *__restrict format, va_list vlist)) {
internal::ArgList args(vlist); // This holder class allows for easier copying
// and pointer semantics, as well as handling
// destruction automatically.
printf_core::WriteBuffer<printf_core::Mode<
printf_core::WriteMode::FILL_BUFF_AND_DROP_OVERFLOW>::value>
wb(buffer, (buffsz > 0 ? buffsz - 1 : 0));
printf_core::Writer writer(wb);
int ret_val = printf_core::printf_main(&writer, format, args);
if (buffsz > 0) // if the buffsz is 0 the buffer may be a null pointer.
wb.buff[wb.buff_cur] = '\0';
return ret_val;
}
} // namespace LIBC_NAMESPACE_DECL
|
