1/*
2  File: quote.c
3
4  Copyright (C) 2003 Andreas Gruenbacher <a.gruenbacher@computer.org>
5
6  This program is free software; you can redistribute it and/or
7  modify it under the terms of the GNU Library General Public
8  License as published by the Free Software Foundation; either
9  version 2 of the License, or (at your option) any later version.
10
11  This program is distributed in the hope that it will be useful,
12  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  Library General Public License for more details.
15
16  You should have received a copy of the GNU Library General Public
17  License along with this library; if not, write to the Free Software
18  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19*/
20
21#include <stdio.h>
22#include <stdlib.h>
23#include <ctype.h>
24#include "misc.h"
25
26const char *quote(const char *str)
27{
28	static char *quoted_str;
29	static size_t quoted_str_len;
30	const unsigned char *s;
31	char *q;
32	size_t nonpr;
33
34	if (!str)
35		return str;
36
37	for (nonpr = 0, s = (unsigned char *)str; *s != '\0'; s++)
38		if (!isprint(*s) || isspace(*s) || *s == '\\')
39			nonpr++;
40	if (nonpr == 0)
41		return str;
42
43	if (high_water_alloc((void **)&quoted_str, &quoted_str_len,
44			     nonpr * 3 + 1))
45		return NULL;
46	for (s = (unsigned char *)str, q = quoted_str; *s != '\0'; s++) {
47		if (!isprint(*s) || isspace(*s) || *s == '\\') {
48			*q++ = '\\';
49			*q++ = '0' + ((*s >> 6)    );
50			*q++ = '0' + ((*s >> 3) & 7);
51			*q++ = '0' + ((*s     ) & 7);
52		} else
53			*q++ = *s;
54	}
55	*q++ = '\0';
56
57	return quoted_str;
58}
59