1  /*
       2    File: unquote.c
       3  
       4    Copyright (C) 2003 Andreas Gruenbacher <andreas.gruenbacher@gmail.com>
       5  
       6    This program is free software; you can redistribute it and/or modify it under
       7    the terms of the GNU Lesser General Public License as published by the
       8    Free Software Foundation; either version 2.1 of the License, or (at
       9    your option) any later version.
      10  
      11    This program is distributed in the hope that it will be useful, but WITHOUT
      12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      13    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
      14    License for more details.
      15  
      16    You should have received a copy of the GNU Lesser General Public
      17    License along with this program.  If not, see <http://www.gnu.org/licenses/>.
      18  */
      19  
      20  #include "config.h"
      21  
      22  #include <stdio.h>
      23  #include <stdlib.h>
      24  #include <ctype.h>
      25  #include "misc.h"
      26  
      27  char *unquote(char *str)
      28  {
      29  	unsigned char *s, *t;
      30  
      31  	if (!str)
      32  		return str;
      33  
      34  	for (s = (unsigned char *)str; *s != '\0'; s++)
      35  		if (*s == '\\')
      36  			break;
      37  	if (*s == '\0')
      38  		return str;
      39  
      40  #define isoctal(c) \
      41  	((c) >= '0' && (c) <= '7')
      42  
      43  	t = s;
      44  	do {
      45  		if (*s == '\\' &&
      46  		    isoctal(*(s+1)) && isoctal(*(s+2)) && isoctal(*(s+3))) {
      47  			*t++ = ((*(s+1) - '0') << 6) +
      48  			       ((*(s+2) - '0') << 3) +
      49  			       ((*(s+3) - '0')     );
      50  			s += 3;
      51  		} else
      52  			*t++ = *s;
      53  	} while (*s++ != '\0');
      54  
      55  	return str;
      56  }