Program: 163244
Project: 163244
Buggy source:
private void parseQuotedValue(){
  if (prev != '\0' && parseUnescapedQuotesUntilDelimiter) {
    if (quoteHandling == SKIP_VALUE) {
      skipValue();
      return;
    }
    if (!keepQuotes) {
      output.appender.prepend(quote);
    }
    ch=input.nextChar();
    output.trim=ignoreTrailingWhitespace;
    ch=output.appender.appendUntil(ch,input,delimiter,newLine);
  }
 else {
    if (keepQuotes && prev == '\0') {
      output.appender.append(quote);
    }
    ch=input.nextChar();
    while (true) {
      if (prev == quote && (ch <= ' ' && whitespaceRangeStart < ch || ch == delimiter || ch == newLine)) {
        break;
      }
      if (ch != quote && ch != quoteEscape) {
        if (prev == quote) {
          if (handleUnescapedQuote()) {
            if (quoteHandling == SKIP_VALUE) {
              break;
            }
 else {
              return;
            }
          }
 else {
            return;
          }
        }
        if (prev == quoteEscape && quoteEscape != '\0') {
          output.appender.append(quoteEscape);
        }
        ch=output.appender.appendUntil(ch,input,quote,quoteEscape,escapeEscape);
        prev=ch;
        ch=input.nextChar();
      }
 else {
        processQuoteEscape();
        prev=ch;
        ch=input.nextChar();
        if (unescaped && (ch == delimiter || ch == newLine)) {
          return;
        }
      }
    }
    if (ch != delimiter && ch != newLine && ch <= ' ' && whitespaceRangeStart < ch) {
      whitespaceAppender.reset();
      do {
        whitespaceAppender.append(ch);
        ch=input.nextChar();
        if (ch == newLine) {
          return;
        }
      }
 while (ch <= ' ' && whitespaceRangeStart < ch);
      if (ch != delimiter && parseUnescapedQuotes) {
        if (output.appender instanceof DefaultCharAppender) {
          output.appender.append(quote);
          ((DefaultCharAppender)output.appender).append(whitespaceAppender);
        }
        if (parseUnescapedQuotesUntilDelimiter || ch != quote && ch != quoteEscape) {
          output.appender.append(ch);
        }
        prev=ch;
        parseQuotedValue();
      }
 else       if (keepQuotes) {
        output.appender.append(quote);
      }
    }
 else     if (keepQuotes) {
      output.appender.append(quote);
    }
    if (ch != delimiter && ch != newLine) {
      throw new TextParsingException(context,"String_Node_Str" + ch + "String_Node_Str"+ delimiter+ "String_Node_Str");
    }
  }
}

Fixed version (ground truth):
private void parseQuotedValue(){
  if (prev != '\0' && parseUnescapedQuotesUntilDelimiter) {
    if (quoteHandling == SKIP_VALUE) {
      skipValue();
      return;
    }
    if (!keepQuotes) {
      output.appender.prepend(quote);
    }
    ch=input.nextChar();
    output.trim=ignoreTrailingWhitespace;
    ch=output.appender.appendUntil(ch,input,delimiter,newLine);
  }
 else {
    if (keepQuotes && prev == '\0') {
      output.appender.append(quote);
    }
    ch=input.nextChar();
    while (true) {
      if (prev == quote && (ch <= ' ' && whitespaceRangeStart < ch || ch == delimiter || ch == newLine)) {
        break;
      }
      if (ch != quote && ch != quoteEscape) {
        if (prev == quote) {
          if (handleUnescapedQuote()) {
            if (quoteHandling == SKIP_VALUE) {
              break;
            }
 else {
              return;
            }
          }
 else {
            return;
          }
        }
        if (prev == quoteEscape && quoteEscape != '\0') {
          output.appender.append(quoteEscape);
        }
        ch=output.appender.appendUntil(ch,input,quote,quoteEscape,escapeEscape);
        prev=ch;
        ch=input.nextChar();
      }
 else {
        processQuoteEscape();
        prev=ch;
        ch=input.nextChar();
        if (unescaped && (ch == delimiter || ch == newLine)) {
          return;
        }
      }
    }
    if (ch != delimiter && ch != newLine && ch <= ' ' && whitespaceRangeStart < ch) {
      whitespaceAppender.reset();
      do {
        whitespaceAppender.append(ch);
        ch=input.nextChar();
        if (ch == newLine) {
          if (keepQuotes) {
            output.appender.append(quote);
          }
          return;
        }
      }
 while (ch <= ' ' && whitespaceRangeStart < ch);
      if (ch != delimiter && parseUnescapedQuotes) {
        if (output.appender instanceof DefaultCharAppender) {
          output.appender.append(quote);
          ((DefaultCharAppender)output.appender).append(whitespaceAppender);
        }
        if (parseUnescapedQuotesUntilDelimiter || ch != quote && ch != quoteEscape) {
          output.appender.append(ch);
        }
        prev=ch;
        parseQuotedValue();
      }
 else       if (keepQuotes) {
        output.appender.append(quote);
      }
    }
 else     if (keepQuotes) {
      output.appender.append(quote);
    }
    if (ch != delimiter && ch != newLine) {
      throw new TextParsingException(context,"String_Node_Str" + ch + "String_Node_Str"+ delimiter+ "String_Node_Str");
    }
  }
}