/*

  File: quote.c

  Copyright (C) 2003 Andreas Gruenbacher <a.gruenbacher@bestbits.at>

  This program is free software; you can redistribute it and/or modify it under

  the terms of the GNU Lesser General Public License as published by the

  Free Software Foundation; either version 2.1 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 Lesser General Public

  License for more details.

  You should have received a copy of the GNU Lesser General Public

  License along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "config.h"

#include <stdio.h>

#include <stdlib.h>

#include <ctype.h>

#include <string.h>

#include "misc.h"

const char *__acl_quote(const char *str, const char *quote_chars)

{

	static char *quoted_str;

	static size_t quoted_str_len;

	const unsigned char *s;

	char *q;

	size_t nonpr;

	if (!str)

		return str;

	for (nonpr = 0, s = (unsigned char *)str; *s != '\0'; s++)

		if (*s == '\\' || strchr(quote_chars, *s))

			nonpr++;

	if (nonpr == 0)

		return str;

	if (__acl_high_water_alloc((void **)&quoted_str, &quoted_str_len,

			     (s - (unsigned char *)str) + nonpr * 3 + 1))

		return NULL;

	for (s = (unsigned char *)str, q = quoted_str; *s != '\0'; s++) {

		if (strchr(quote_chars, *s)) {

			*q++ = '\\';

			*q++ = '0' + ((*s >> 6)    );

			*q++ = '0' + ((*s >> 3) & 7);

			*q++ = '0' + ((*s     ) & 7);

		} else if (*s == '\\') {

			*q++ = '\\';

			*q++ = '\\';

		} else

			*q++ = *s;

	}

	*q++ = '\0';

	return quoted_str;

}