32 lines · cpp
1//===-- Implementation of vsscanf -------------------------------*- 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-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/stdio/vsscanf.h"10 11#include "hdr/stdio_macros.h"12#include "src/__support/CPP/limits.h"13#include "src/__support/arg_list.h"14#include "src/stdio/scanf_core/scanf_main.h"15#include "src/stdio/scanf_core/string_reader.h"16 17#include <stdarg.h>18 19namespace LIBC_NAMESPACE_DECL {20 21LLVM_LIBC_FUNCTION(int, vsscanf,22 (const char *buffer, const char *format, va_list vlist)) {23 internal::ArgList args(vlist);24 scanf_core::StringReader reader(buffer, cpp::numeric_limits<size_t>::max());25 int ret_val = scanf_core::scanf_main(&reader, format, args);26 // This is done to avoid including stdio.h in the internals. On most systems27 // EOF is -1, so this will be transformed into just "return ret_val".28 return (ret_val == -1) ? EOF : ret_val;29}30 31} // namespace LIBC_NAMESPACE_DECL32