1/*	$NetBSD: ns_ttl.c,v 1.2 2004/05/20 20:35:05 christos Exp $	*/
2
3/*
4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (c) 1996,1999 by Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
18 */
19
20#include <sys/cdefs.h>
21#ifndef lint
22#ifdef notdef
23static const char rcsid[] = "Id: ns_ttl.c,v 1.1.206.1 2004/03/09 08:33:45 marka Exp";
24#else
25__RCSID("$NetBSD: ns_ttl.c,v 1.2 2004/05/20 20:35:05 christos Exp $");
26#endif
27#endif
28
29/* Import. */
30
31#include "arpa_nameser.h"
32
33#include <ctype.h>
34#include <errno.h>
35#include <stdio.h>
36#include <string.h>
37
38#ifdef SPRINTF_CHAR
39# define SPRINTF(x) strlen(sprintf/**/x)
40#else
41# define SPRINTF(x) ((size_t)sprintf x)
42#endif
43
44/* Forward. */
45
46static int	fmt1(int t, char s, char **buf, size_t *buflen);
47
48/* Macros. */
49
50#define T(x) do { if ((x) < 0) return (-1); } while(0)
51
52/* Public. */
53
54int
55ns_format_ttl(u_long src, char *dst, size_t dstlen) {
56	char *odst = dst;
57	int secs, mins, hours, days, weeks, x;
58	char *p;
59
60	secs = src % 60;   src /= 60;
61	mins = src % 60;   src /= 60;
62	hours = src % 24;  src /= 24;
63	days = src % 7;    src /= 7;
64	weeks = src;       src = 0;
65
66	x = 0;
67	if (weeks) {
68		T(fmt1(weeks, 'W', &dst, &dstlen));
69		x++;
70	}
71	if (days) {
72		T(fmt1(days, 'D', &dst, &dstlen));
73		x++;
74	}
75	if (hours) {
76		T(fmt1(hours, 'H', &dst, &dstlen));
77		x++;
78	}
79	if (mins) {
80		T(fmt1(mins, 'M', &dst, &dstlen));
81		x++;
82	}
83	if (secs || !(weeks || days || hours || mins)) {
84		T(fmt1(secs, 'S', &dst, &dstlen));
85		x++;
86	}
87
88	if (x > 1) {
89		int ch;
90
91		for (p = odst; (ch = *p) != '\0'; p++)
92			if (isascii(ch) && isupper(ch))
93				*p = tolower(ch);
94	}
95
96	return (dst - odst);
97}
98
99#ifndef _LIBC
100int
101ns_parse_ttl(const char *src, u_long *dst) {
102	u_long ttl, tmp;
103	int ch, digits, dirty;
104
105	ttl = 0;
106	tmp = 0;
107	digits = 0;
108	dirty = 0;
109	while ((ch = *src++) != '\0') {
110		if (!isascii(ch) || !isprint(ch))
111			goto einval;
112		if (isdigit(ch)) {
113			tmp *= 10;
114			tmp += (ch - '0');
115			digits++;
116			continue;
117		}
118		if (digits == 0)
119			goto einval;
120		if (islower(ch))
121			ch = toupper(ch);
122		switch (ch) {
123		case 'W':  tmp *= 7;	/*FALLTHROUGH*/
124		case 'D':  tmp *= 24;	/*FALLTHROUGH*/
125		case 'H':  tmp *= 60;	/*FALLTHROUGH*/
126		case 'M':  tmp *= 60;	/*FALLTHROUGH*/
127		case 'S':  break;
128		default:   goto einval;
129		}
130		ttl += tmp;
131		tmp = 0;
132		digits = 0;
133		dirty = 1;
134	}
135	if (digits > 0) {
136		if (dirty)
137			goto einval;
138		else
139			ttl += tmp;
140	}
141	*dst = ttl;
142	return (0);
143
144 einval:
145	errno = EINVAL;
146	return (-1);
147}
148#endif
149
150/* Private. */
151
152static int
153fmt1(int t, char s, char **buf, size_t *buflen) {
154	char tmp[50];
155	size_t len;
156
157	len = SPRINTF((tmp, "%d%c", t, s));
158	if (len + 1 > *buflen)
159		return (-1);
160	strcpy(*buf, tmp);
161	*buf += len;
162	*buflen -= len;
163	return (0);
164}
165