ns_ttl.c revision 1.1 
1/*	$NetBSD: ns_ttl.c,v 1.1 2004/05/20 20:01:31 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#ifndef lint
21static const char rcsid[] = "Id: ns_ttl.c,v 1.1.206.1 2004/03/09 08:33:45 marka Exp";
22#endif
23
24/* Import. */
25
26#include "port_before.h"
27
28#include <arpa/nameser.h>
29
30#include <ctype.h>
31#include <errno.h>
32#include <stdio.h>
33#include <string.h>
34
35#include "port_after.h"
36
37#ifdef SPRINTF_CHAR
38# define SPRINTF(x) strlen(sprintf/**/x)
39#else
40# define SPRINTF(x) ((size_t)sprintf x)
41#endif
42
43/* Forward. */
44
45static int	fmt1(int t, char s, char **buf, size_t *buflen);
46
47/* Macros. */
48
49#define T(x) if ((x) < 0) return (-1); else (void)NULL
50
51/* Public. */
52
53int
54ns_format_ttl(u_long src, char *dst, size_t dstlen) {
55	char *odst = dst;
56	int secs, mins, hours, days, weeks, x;
57	char *p;
58
59	secs = src % 60;   src /= 60;
60	mins = src % 60;   src /= 60;
61	hours = src % 24;  src /= 24;
62	days = src % 7;    src /= 7;
63	weeks = src;       src = 0;
64
65	x = 0;
66	if (weeks) {
67		T(fmt1(weeks, 'W', &dst, &dstlen));
68		x++;
69	}
70	if (days) {
71		T(fmt1(days, 'D', &dst, &dstlen));
72		x++;
73	}
74	if (hours) {
75		T(fmt1(hours, 'H', &dst, &dstlen));
76		x++;
77	}
78	if (mins) {
79		T(fmt1(mins, 'M', &dst, &dstlen));
80		x++;
81	}
82	if (secs || !(weeks || days || hours || mins)) {
83		T(fmt1(secs, 'S', &dst, &dstlen));
84		x++;
85	}
86
87	if (x > 1) {
88		int ch;
89
90		for (p = odst; (ch = *p) != '\0'; p++)
91			if (isascii(ch) && isupper(ch))
92				*p = tolower(ch);
93	}
94
95	return (dst - odst);
96}
97
98int
99ns_parse_ttl(const char *src, u_long *dst) {
100	u_long ttl, tmp;
101	int ch, digits, dirty;
102
103	ttl = 0;
104	tmp = 0;
105	digits = 0;
106	dirty = 0;
107	while ((ch = *src++) != '\0') {
108		if (!isascii(ch) || !isprint(ch))
109			goto einval;
110		if (isdigit(ch)) {
111			tmp *= 10;
112			tmp += (ch - '0');
113			digits++;
114			continue;
115		}
116		if (digits == 0)
117			goto einval;
118		if (islower(ch))
119			ch = toupper(ch);
120		switch (ch) {
121		case 'W':  tmp *= 7;
122		case 'D':  tmp *= 24;
123		case 'H':  tmp *= 60;
124		case 'M':  tmp *= 60;
125		case 'S':  break;
126		default:   goto einval;
127		}
128		ttl += tmp;
129		tmp = 0;
130		digits = 0;
131		dirty = 1;
132	}
133	if (digits > 0) {
134		if (dirty)
135			goto einval;
136		else
137			ttl += tmp;
138	}
139	*dst = ttl;
140	return (0);
141
142 einval:
143	errno = EINVAL;
144	return (-1);
145}
146
147/* Private. */
148
149static int
150fmt1(int t, char s, char **buf, size_t *buflen) {
151	char tmp[50];
152	size_t len;
153
154	len = SPRINTF((tmp, "%d%c", t, s));
155	if (len + 1 > *buflen)
156		return (-1);
157	strcpy(*buf, tmp);
158	*buf += len;
159	*buflen -= len;
160	return (0);
161}
162