text: /*
   * Copyright (c) 2017,2019 Daichi GOTO
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are 
   * met: 
   * 
   * 1. Redistributions of source code must retain the above copyright 
   *    notice, this list of conditions and the following disclaimer. 
   * 2. Redistributions in binary form must reproduce the above copyright 
   *    notice, this list of conditions and the following disclaimer in the 
   *    documentation and/or other materials provided with the distribution. 
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "ttt.h"
  
  char *
  _quote2charref(char *str)
  {
  	char *buf, *p;
  	int len, i;
  	for (p = str, len = 0; *p != '\0'; p++)
  		if ('"' == *p)
  			len += 6; /* &quot; */
  		else if ('\'' == *p)
  			len += 5; /* &#39; */
  		else
  			++len;
  	buf = calloc(len + 1, sizeof(char));
  	buf[len] = '\0';
  
  	for (i = 0, p = str; i < len; p++, i++)
  		if ('"' == *p) {
  			buf[i++] = '&';
  			buf[i++] = 'q';
  			buf[i++] = 'u';
  			buf[i++] = 'o';
  			buf[i++] = 't';
  			buf[i] = ';';
  		}
  		else if ('\'' == *p) {
  			buf[i++] = '&';
  			buf[i++] = '#';
  			buf[i++] = '3';
  			buf[i++] = '9';
  			buf[i] = ';';
  		}
  		else
  			buf[i] = *p;
  	
  	return buf;
  }
  