Line data    Source code

       1             : /*
       2             :  *
       3             :  *    Copyright (c) 2023 Project CHIP Authors
       4             :  *    All rights reserved.
       5             :  *
       6             :  *    Licensed under the Apache License, Version 2.0 (the "License");
       7             :  *    you may not use this file except in compliance with the License.
       8             :  *    You may obtain a copy of the License at
       9             :  *
      10             :  *        http://www.apache.org/licenses/LICENSE-2.0
      11             :  *
      12             :  *    Unless required by applicable law or agreed to in writing, software
      13             :  *    distributed under the License is distributed on an "AS IS" BASIS,
      14             :  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
      15             :  *    See the License for the specific language governing permissions and
      16             :  *    limitations under the License.
      17             :  */
      18             : #include "StringBuilder.h"
      19             : 
      20             : namespace chip {
      21             : 
      22        1706 : StringBuilderBase & StringBuilderBase::AddFormat(const char * format, ...)
      23             : {
      24             :     va_list args;
      25        1706 :     va_start(args, format);
      26             : 
      27        1706 :     char * output = nullptr;
      28        1706 :     if (mWriter.Available() > 0)
      29             :     {
      30        1700 :         output = reinterpret_cast<char *>(mWriter.Buffer() + mWriter.Needed());
      31             :     }
      32             :     else
      33             :     {
      34           6 :         output = reinterpret_cast<char *>(mWriter.Buffer() + mWriter.Size());
      35             :     }
      36             : 
      37             :     // the + 1 size here because StringBuilder reserves one byte for final null terminator
      38        1706 :     int needed = vsnprintf(output, mWriter.Available() + 1, format, args);
      39             : 
      40             :     // on invalid formats, printf-style methods return negative numbers
      41        1706 :     if (needed > 0)
      42             :     {
      43        1706 :         mWriter.Skip(static_cast<size_t>(needed));
      44             :     }
      45             : 
      46        1706 :     va_end(args);
      47        1706 :     NullTerminate();
      48        1706 :     return *this;
      49             : }
      50             : 
      51         248 : StringBuilderBase & StringBuilderBase::AddMarkerIfOverflow()
      52             : {
      53         248 :     if (mWriter.Fit())
      54             :     {
      55         239 :         return *this;
      56             :     }
      57             : 
      58          36 :     for (unsigned i = 0; i < 3; i++)
      59             :     {
      60          27 :         if (mWriter.Size() >= i + 1)
      61             :         {
      62          21 :             mWriter.Buffer()[mWriter.Size() - i - 1] = '.';
      63             :         }
      64             :     }
      65           9 :     return *this;
      66             : }
      67             : } // namespace chip