src/stdio/scanf_core/scanf_main.cpp

//===-- Starting point for scanf --------------------------------*- 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/scanf_core/scanf_main.h"

#include "src/__support/arg_list.h"
#include "src/stdio/scanf_core/converter.h"
#include "src/stdio/scanf_core/core_structs.h"
#include "src/stdio/scanf_core/parser.h"
#include "src/stdio/scanf_core/reader.h"

#include <stddef.h>

namespace LIBC_NAMESPACE {
namespace scanf_core {

int scanf_main(Reader *reader, const char *__restrict str,
               internal::ArgList &args) {
  Parser<internal::ArgList> parser(str, args);
  int ret_val = READ_OK;
  int conversions = 0;
  for (FormatSection cur_section = parser.get_next_section();
       !cur_section.raw_string.empty() && ret_val == READ_OK;
       cur_section = parser.get_next_section()) {
    if (cur_section.has_conv) {
      ret_val = convert(reader, cur_section);
      // The %n (current position) conversion doesn't increment the number of
      // assignments.
      if (cur_section.conv_name != 'n')
        conversions += ret_val == READ_OK ? 1 : 0;
    } else {
      ret_val = raw_match(reader, cur_section.raw_string);
    }
  }

  return conversions;
}

} // namespace scanf_core
} // namespace LIBC_NAMESPACE