libc/src/stdio/scanf_core/ptr_converter.cpp

   1 //===-- Int type specifier converters for scanf -----------------*- 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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/stdio/scanf_core/ptr_converter.h"
  10
  11 #include "src/stdio/scanf_core/converter_utils.h"
  12 #include "src/stdio/scanf_core/core_structs.h"
  13 #include "src/stdio/scanf_core/int_converter.h"
  14 #include "src/stdio/scanf_core/reader.h"
  15
  16 #include <stddef.h>
  17
  18 namespace LIBC_NAMESPACE {
  19 namespace scanf_core {
  20 int convert_pointer(Reader *reader, const FormatSection &to_conv) {
  21   static const char nullptr_string[] = "(nullptr)";
  22
  23   // Check if it's exactly the nullptr string, if so then it's a nullptr.
  24   char cur_char = reader->getc();
  25   size_t i = 0;
  26   for (; i < sizeof(nullptr_string) && to_lower(cur_char) == nullptr_string[i];
  27        ++i) {
  28     cur_char = reader->getc();
  29   }
  30   if (i == (sizeof(nullptr_string) - 1)) {
  31     *reinterpret_cast<void **>(to_conv.output_ptr) = nullptr;
  32     return READ_OK;
  33   } else if (i > 0) {
  34     return MATCHING_FAILURE;
  35   }
  36
  37   reader->ungetc(cur_char);
  38
  39   // Else treat it as a hex int
  40   return convert_int(reader, to_conv);
  41 }
  42 } // namespace scanf_core
  43 } // namespace LIBC_NAMESPACE