kc3-lang/angle/src/compiler/preprocessor/Input.cpp

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• Hash : 9d737966
  Author :
  Date : 2019-08-14T12:25:12
  

  Standardize copyright notices to project style
  
  For all "ANGLE Project" copyrights, standardize to the format specified
  by the style guide. Changes:
  - "Copyright (c)" and "Copyright(c)" changed to just "Copyright".
  - Removed the second half of date ranges ("Y1Y1-Y2Y2"->"Y1Y1").
  - Fixed a small number of files that had no copyright date using the
    initial commit year from the version control history.
  - Fixed one instance of copyright being "The ANGLE Project" rather than
    "The ANGLE Project Authors"
  
  These changes are applied both to the copyright of source file, and
  where applicable to copyright statements that are generated by
  templates.
  
  BUG=angleproject:3811
  
  Change-Id: I973dd65e4ef9deeba232d5be74c768256a0eb2e5
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1754397
  Commit-Queue: Jamie Madill <jmadill@chromium.org>
  Reviewed-by: Jamie Madill <jmadill@chromium.org>
  

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• src/compiler/preprocessor/Input.cpp

• //
  // Copyright 2011 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #include "compiler/preprocessor/Input.h"
  
  #include <algorithm>
  #include <cstring>
  
  #include "common/debug.h"
  
  namespace angle
  {
  
  namespace pp
  {
  
  Input::Input() : mCount(0), mString(0) {}
  
  Input::~Input() {}
  
  Input::Input(size_t count, const char *const string[], const int length[])
      : mCount(count), mString(string)
  {
      mLength.reserve(mCount);
      for (size_t i = 0; i < mCount; ++i)
      {
          int len = length ? length[i] : -1;
          mLength.push_back(len < 0 ? std::strlen(mString[i]) : len);
      }
  }
  
  const char *Input::skipChar()
  {
      // This function should only be called when there is a character to skip.
      ASSERT(mReadLoc.cIndex < mLength[mReadLoc.sIndex]);
      ++mReadLoc.cIndex;
      if (mReadLoc.cIndex == mLength[mReadLoc.sIndex])
      {
          ++mReadLoc.sIndex;
          mReadLoc.cIndex = 0;
      }
      if (mReadLoc.sIndex >= mCount)
      {
          return nullptr;
      }
      return mString[mReadLoc.sIndex] + mReadLoc.cIndex;
  }
  
  size_t Input::read(char *buf, size_t maxSize, int *lineNo)
  {
      size_t nRead = 0;
      // The previous call to read might have stopped copying the string when encountering a line
      // continuation. Check for this possibility first.
      if (mReadLoc.sIndex < mCount && maxSize > 0)
      {
          const char *c = mString[mReadLoc.sIndex] + mReadLoc.cIndex;
          if ((*c) == '\\')
          {
              c = skipChar();
              if (c != nullptr && (*c) == '\n')
              {
                  // Line continuation of backslash + newline.
                  skipChar();
                  // Fake an EOF if the line number would overflow.
                  if (*lineNo == INT_MAX)
                  {
                      return 0;
                  }
                  ++(*lineNo);
              }
              else if (c != nullptr && (*c) == '\r')
              {
                  // Line continuation. Could be backslash + '\r\n' or just backslash + '\r'.
                  c = skipChar();
                  if (c != nullptr && (*c) == '\n')
                  {
                      skipChar();
                  }
                  // Fake an EOF if the line number would overflow.
                  if (*lineNo == INT_MAX)
                  {
                      return 0;
                  }
                  ++(*lineNo);
              }
              else
              {
                  // Not line continuation, so write the skipped backslash to buf.
                  *buf = '\\';
                  ++nRead;
              }
          }
      }
  
      size_t maxRead = maxSize;
      while ((nRead < maxRead) && (mReadLoc.sIndex < mCount))
      {
          size_t size = mLength[mReadLoc.sIndex] - mReadLoc.cIndex;
          size        = std::min(size, maxSize);
          for (size_t i = 0; i < size; ++i)
          {
              // Stop if a possible line continuation is encountered.
              // It will be processed on the next call on input, which skips it
              // and increments line number if necessary.
              if (*(mString[mReadLoc.sIndex] + mReadLoc.cIndex + i) == '\\')
              {
                  size    = i;
                  maxRead = nRead + size;  // Stop reading right before the backslash.
              }
          }
          std::memcpy(buf + nRead, mString[mReadLoc.sIndex] + mReadLoc.cIndex, size);
          nRead += size;
          mReadLoc.cIndex += size;
  
          // Advance string if we reached the end of current string.
          if (mReadLoc.cIndex == mLength[mReadLoc.sIndex])
          {
              ++mReadLoc.sIndex;
              mReadLoc.cIndex = 0;
          }
      }
      return nRead;
  }
  
  }  // namespace pp
  
  }  // namespace angle
  

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