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unquote.c

/*
  File: unquote.c

  Copyright (C) 2003 Andreas Gruenbacher <a.gruenbacher@computer.org>

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "misc.h"

char *unquote(char *str)
{
      unsigned char *s, *t;

      if (!str)
            return str;

      for (s = (unsigned char *)str; *s != '\0'; s++)
            if (*s == '\\')
                  break;
      if (*s == '\0')
            return str;

#define isoctal(c) \
      ((c) >= '0' && (c) <= '7')

      t = s;
      do {
            if (*s == '\\' &&
                isoctal(*(s+1)) && isoctal(*(s+2)) && isoctal(*(s+3))) {
                  *t++ = ((*(s+1) - '0') << 6) +
                         ((*(s+2) - '0') << 3) +
                         ((*(s+3) - '0')     );
                  s += 3;
            } else
                  *t++ = *s;
      } while (*s++ != '\0');

      return str;
}

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