1/*
2 * Copyright (c) 1996,1999 by Internet Software Consortium.
3 *
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
9 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
10 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
11 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
12 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
13 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
14 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
15 * SOFTWARE.
16 */
17
18#ifndef __APPLE__
19#ifndef lint
20static const char rcsid[] = "$Id: ns_ttl.c,v 1.1 2006/03/01 19:01:37 majka Exp $";
21#endif
22#endif
23
24/* Import. */
25
26#ifndef __APPLE__
27#include "port_before.h"
28#endif
29
30#include <arpa/nameser.h>
31
32#include <ctype.h>
33#include <errno.h>
34#include <stdio.h>
35#include <string.h>
36
37#ifndef __APPLE__
38#include "port_after.h"
39#endif
40
41#ifdef SPRINTF_CHAR
42# define SPRINTF(x) strlen(sprintf/**/x)
43#else
44# define SPRINTF(x) ((size_t)sprintf x)
45#endif
46
47/* Forward. */
48
49static int	fmt1(int t, char s, char **buf, size_t *buflen);
50
51/* Macros. */
52
53#define T(x) if ((x) < 0) return (-1); else (void)NULL
54
55/* Public. */
56
57int
58ns_format_ttl(u_long src, char *dst, size_t dstlen) {
59	char *odst = dst;
60	int secs, mins, hours, days, weeks, x;
61	char *p;
62
63	secs = src % 60;   src /= 60;
64	mins = src % 60;   src /= 60;
65	hours = src % 24;  src /= 24;
66	days = src % 7;    src /= 7;
67	weeks = src;       src = 0;
68
69	x = 0;
70	if (weeks) {
71		T(fmt1(weeks, 'W', &dst, &dstlen));
72		x++;
73	}
74	if (days) {
75		T(fmt1(days, 'D', &dst, &dstlen));
76		x++;
77	}
78	if (hours) {
79		T(fmt1(hours, 'H', &dst, &dstlen));
80		x++;
81	}
82	if (mins) {
83		T(fmt1(mins, 'M', &dst, &dstlen));
84		x++;
85	}
86	if (secs || !(weeks || days || hours || mins)) {
87		T(fmt1(secs, 'S', &dst, &dstlen));
88		x++;
89	}
90
91	if (x > 1) {
92		int ch;
93
94		for (p = odst; (ch = *p) != '\0'; p++)
95			if (isascii(ch) && isupper(ch))
96				*p = tolower(ch);
97	}
98
99	return (dst - odst);
100}
101
102int
103ns_parse_ttl(const char *src, u_long *dst) {
104	u_long ttl, tmp;
105	int ch, digits, dirty;
106
107	ttl = 0;
108	tmp = 0;
109	digits = 0;
110	dirty = 0;
111	while ((ch = *src++) != '\0') {
112		if (!isascii(ch) || !isprint(ch))
113			goto einval;
114		if (isdigit(ch)) {
115			tmp *= 10;
116			tmp += (ch - '0');
117			digits++;
118			continue;
119		}
120		if (digits == 0)
121			goto einval;
122		if (islower(ch))
123			ch = toupper(ch);
124		switch (ch) {
125		case 'W':  tmp *= 7;
126		case 'D':  tmp *= 24;
127		case 'H':  tmp *= 60;
128		case 'M':  tmp *= 60;
129		case 'S':  break;
130		default:   goto einval;
131		}
132		ttl += tmp;
133		tmp = 0;
134		digits = 0;
135		dirty = 1;
136	}
137	if (digits > 0) {
138		if (dirty)
139			goto einval;
140		else
141			ttl += tmp;
142	}
143	*dst = ttl;
144	return (0);
145
146 einval:
147	errno = EINVAL;
148	return (-1);
149}
150
151/* Private. */
152
153static int
154fmt1(int t, char s, char **buf, size_t *buflen) {
155	char tmp[50];
156	size_t len;
157
158	len = SPRINTF((tmp, "%d%c", t, s));
159	if (len + 1 > *buflen)
160		return (-1);
161	strcpy(*buf, tmp);
162	*buf += len;
163	*buflen -= len;
164	return (0);
165}
166