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/__support/ctype_utils.h"
  12 #include "src/__support/macros/config.h"
  13 #include "src/stdio/scanf_core/converter_utils.h"
  14 #include "src/stdio/scanf_core/core_structs.h"
  15 #include "src/stdio/scanf_core/int_converter.h"
  16 #include "src/stdio/scanf_core/reader.h"
  17
  18 #include <stddef.h>
  19
  20 namespace LIBC_NAMESPACE_DECL {
  21 namespace scanf_core {
  22 int convert_pointer(Reader *reader, const FormatSection &to_conv) {
  23   static const char nullptr_string[] = "(nullptr)";
  24
  25   // Check if it's exactly the nullptr string, if so then it's a nullptr.
  26   char cur_char = reader->getc();
  27   size_t i = 0;
  28   for (; i < (sizeof(nullptr_string) - 1) &&
  29          internal::tolower(cur_char) == nullptr_string[i];
  30        ++i) {
  31     cur_char = reader->getc();
  32   }
  33   if (i == (sizeof(nullptr_string) - 1)) {
  34     *reinterpret_cast<void **>(to_conv.output_ptr) = nullptr;
  35     return READ_OK;
  36   } else if (i > 0) {
  37     return MATCHING_FAILURE;
  38   }
  39
  40   reader->ungetc(cur_char);
  41
  42   // Else treat it as a hex int
  43   return convert_int(reader, to_conv);
  44 }
  45 } // namespace scanf_core
  46 } // namespace LIBC_NAMESPACE_DECL