Program: 93874
Project: 93874
Buggy source:
/** 
 * {@inheritDoc}
 */
public boolean readColumns(final List<String> columns) throws IOException {
  if (columns == null) {
    throw new NullPointerException("String_Node_Str");
  }
  columns.clear();
  currentColumn.setLength(0);
  currentRow.setLength(0);
  String line;
  do {
    line=readLine();
    if (line == null) {
      return false;
    }
  }
 while (ignoreEmptyLines && line.length() == 0 || (commentMatcher != null && commentMatcher.isComment(line)));
  currentRow.append(line);
  TokenizerState state=TokenizerState.NORMAL;
  int quoteScopeStartingLine=-1;
  int potentialSpaces=0;
  int charIndex=0;
  while (true) {
    boolean endOfLineReached=charIndex == line.length();
    if (endOfLineReached) {
      if (TokenizerState.NORMAL.equals(state)) {
        if (!surroundingSpacesNeedQuotes) {
          appendSpaces(currentColumn,potentialSpaces);
        }
        columns.add(currentColumn.length() > 0 ? currentColumn.toString() : null);
        return true;
      }
 else {
        currentColumn.append(NEWLINE);
        currentRow.append(NEWLINE);
        charIndex=0;
        line=readLine();
        if (maxLinesPerRow > 0 && getLineNumber() - quoteScopeStartingLine + 1 > maxLinesPerRow) {
          String msg=maxLinesPerRow == 1 ? String.format("String_Node_Str",getLineNumber() - 1) : String.format("String_Node_Str" + "String_Node_Str",quoteScopeStartingLine,getLineNumber());
          throw new SuperCsvException(msg);
        }
 else         if (line == null) {
          throw new SuperCsvException(String.format("String_Node_Str",quoteScopeStartingLine,getLineNumber()));
        }
        currentRow.append(line);
        if (line.length() == 0) {
          continue;
        }
      }
    }
    final char c=line.charAt(charIndex);
    if (TokenizerState.NORMAL.equals(state)) {
      if (c == delimeterChar) {
        if (!surroundingSpacesNeedQuotes) {
          appendSpaces(currentColumn,potentialSpaces);
        }
        columns.add(currentColumn.length() > 0 ? currentColumn.toString() : null);
        potentialSpaces=0;
        currentColumn.setLength(0);
      }
 else       if (c == SPACE) {
        potentialSpaces++;
      }
 else       if (c == quoteChar) {
        state=TokenizerState.QUOTE_MODE;
        quoteScopeStartingLine=getLineNumber();
        if (!surroundingSpacesNeedQuotes || currentColumn.length() > 0) {
          appendSpaces(currentColumn,potentialSpaces);
        }
        potentialSpaces=0;
      }
 else {
        if (!surroundingSpacesNeedQuotes || currentColumn.length() > 0) {
          appendSpaces(currentColumn,potentialSpaces);
        }
        potentialSpaces=0;
        currentColumn.append(c);
      }
    }
 else {
      if (c == quoteChar) {
        int nextCharIndex=charIndex + 1;
        boolean availableCharacters=nextCharIndex < line.length();
        boolean nextCharIsQuote=availableCharacters && line.charAt(nextCharIndex) == quoteChar;
        if (nextCharIsQuote) {
          currentColumn.append(c);
          charIndex++;
        }
 else {
          state=TokenizerState.NORMAL;
          quoteScopeStartingLine=-1;
        }
      }
 else {
        currentColumn.append(c);
      }
    }
    charIndex++;
  }
}

Fixed version (ground truth):
/** 
 * {@inheritDoc}
 */
public boolean readColumns(final List<String> columns) throws IOException {
  if (columns == null) {
    throw new NullPointerException("String_Node_Str");
  }
  columns.clear();
  currentColumn.setLength(0);
  currentRow.setLength(0);
  String line;
  do {
    line=readLine();
    if (line == null) {
      return false;
    }
  }
 while (ignoreEmptyLines && line.length() == 0 || (commentMatcher != null && commentMatcher.isComment(line)));
  currentRow.append(line);
  TokenizerState state=TokenizerState.NORMAL;
  int quoteScopeStartingLine=-1;
  int potentialSpaces=0;
  int charIndex=0;
  while (true) {
    boolean endOfLineReached=charIndex == line.length();
    if (endOfLineReached) {
      if (TokenizerState.NORMAL.equals(state)) {
        if (!surroundingSpacesNeedQuotes) {
          appendSpaces(currentColumn,potentialSpaces);
        }
        columns.add(currentColumn.length() > 0 ? currentColumn.toString() : null);
        return true;
      }
 else {
        currentColumn.append(NEWLINE);
        currentRow.append(NEWLINE);
        charIndex=0;
        if (maxLinesPerRow > 0 && getLineNumber() - quoteScopeStartingLine + 1 >= maxLinesPerRow) {
          String msg=maxLinesPerRow == 1 ? String.format("String_Node_Str",getLineNumber()) : String.format("String_Node_Str" + "String_Node_Str",quoteScopeStartingLine,getLineNumber());
          throw new SuperCsvException(msg);
        }
 else         if ((line=readLine()) == null) {
          throw new SuperCsvException(String.format("String_Node_Str",quoteScopeStartingLine,getLineNumber()));
        }
        currentRow.append(line);
        if (line.length() == 0) {
          continue;
        }
      }
    }
    final char c=line.charAt(charIndex);
    if (TokenizerState.NORMAL.equals(state)) {
      if (c == delimeterChar) {
        if (!surroundingSpacesNeedQuotes) {
          appendSpaces(currentColumn,potentialSpaces);
        }
        columns.add(currentColumn.length() > 0 ? currentColumn.toString() : null);
        potentialSpaces=0;
        currentColumn.setLength(0);
      }
 else       if (c == SPACE) {
        potentialSpaces++;
      }
 else       if (c == quoteChar) {
        state=TokenizerState.QUOTE_MODE;
        quoteScopeStartingLine=getLineNumber();
        if (!surroundingSpacesNeedQuotes || currentColumn.length() > 0) {
          appendSpaces(currentColumn,potentialSpaces);
        }
        potentialSpaces=0;
      }
 else {
        if (!surroundingSpacesNeedQuotes || currentColumn.length() > 0) {
          appendSpaces(currentColumn,potentialSpaces);
        }
        potentialSpaces=0;
        currentColumn.append(c);
      }
    }
 else {
      if (c == quoteChar) {
        int nextCharIndex=charIndex + 1;
        boolean availableCharacters=nextCharIndex < line.length();
        boolean nextCharIsQuote=availableCharacters && line.charAt(nextCharIndex) == quoteChar;
        if (nextCharIsQuote) {
          currentColumn.append(c);
          charIndex++;
        }
 else {
          state=TokenizerState.NORMAL;
          quoteScopeStartingLine=-1;
        }
      }
 else {
        currentColumn.append(c);
      }
    }
    charIndex++;
  }
}