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//===-- Implementation of snprintf ------------------------------*- 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/snprintf.h"
#include "src/__support/arg_list.h"
#include "src/stdio/printf_core/printf_main.h"
#include "src/stdio/printf_core/string_writer.h"
#include "src/stdio/printf_core/writer.h"
#include <stdarg.h>
#include <stddef.h>
namespace __llvm_libc {
LLVM_LIBC_FUNCTION(int, snprintf,
(char *__restrict buffer, size_t buffsz,
const char *__restrict format, ...)) {
va_list vlist;
va_start(vlist, format);
internal::ArgList args(vlist); // This holder class allows for easier copying
// and pointer semantics, as well as handling
// destruction automatically.
va_end(vlist);
printf_core::StringWriter str_writer(buffer, (buffsz > 0 ? buffsz - 1 : 0));
printf_core::Writer writer(reinterpret_cast<void *>(&str_writer),
printf_core::StringWriter::write_str,
printf_core::StringWriter::write_chars,
printf_core::StringWriter::write_char);
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.
str_writer.terminate();
return ret_val;
}
} // namespace __llvm_libc
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