| //===-- 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/writer.h" |
| |
| #include <stdarg.h> |
| #include <stddef.h> |
| |
| namespace LIBC_NAMESPACE { |
| |
| 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::WriteBuffer 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 |