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//===-- Implementation of sscanf --------------------------------*- 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/sscanf.h"
#include "src/__support/CPP/limits.h"
#include "src/__support/arg_list.h"
#include "src/stdio/scanf_core/reader.h"
#include "src/stdio/scanf_core/scanf_main.h"
#include <stdarg.h>
#include <stdio.h>
namespace LIBC_NAMESPACE {
LLVM_LIBC_FUNCTION(int, sscanf,
(const char *__restrict buffer,
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);
scanf_core::ReadBuffer rb{const_cast<char *>(buffer),
cpp::numeric_limits<size_t>::max()};
scanf_core::Reader reader(&rb);
int ret_val = scanf_core::scanf_main(&reader, format, args);
// This is done to avoid including stdio.h in the internals. On most systems
// EOF is -1, so this will be transformed into just "return ret_val".
return (ret_val == -1) ? EOF : ret_val;
}
} // namespace LIBC_NAMESPACE
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