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/* $NetBSD: ns_ttl.c,v 1.8 2012/03/13 21:13:39 christos Exp $ */
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1996,1999 by Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/cdefs.h>
#ifndef lint
#ifdef notdef
static const char rcsid[] = "Id: ns_ttl.c,v 1.4 2005/07/28 06:51:49 marka Exp";
#else
__RCSID("$NetBSD: ns_ttl.c,v 1.8 2012/03/13 21:13:39 christos Exp $");
#endif
#endif
/* Import. */
#include <arpa/nameser.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
/* Forward. */
static int fmt1(int t, char s, char **buf, size_t *buflen);
/* Macros. */
#define T(x) do { if ((x) < 0) return (-1); } while(0)
/* Public. */
int
ns_format_ttl(u_long src, char *dst, size_t dstlen) {
char *odst = dst;
int secs, mins, hours, days, weeks, x;
char *p;
secs = (int)(src % 60); src /= 60;
mins = (int)(src % 60); src /= 60;
hours = (int)(src % 24); src /= 24;
days = (int)(src % 7); src /= 7;
weeks = (int)src; src = 0;
x = 0;
if (weeks) {
T(fmt1(weeks, 'W', &dst, &dstlen));
x++;
}
if (days) {
T(fmt1(days, 'D', &dst, &dstlen));
x++;
}
if (hours) {
T(fmt1(hours, 'H', &dst, &dstlen));
x++;
}
if (mins) {
T(fmt1(mins, 'M', &dst, &dstlen));
x++;
}
if (secs || !(weeks || days || hours || mins)) {
T(fmt1(secs, 'S', &dst, &dstlen));
x++;
}
if (x > 1) {
int ch;
for (p = odst; (ch = *p) != '\0'; p++)
if (isascii(ch) && isupper(ch))
*p = tolower(ch);
}
_DIAGASSERT(__type_fit(int, dst - odst));
return (int)(dst - odst);
}
#ifndef _LIBC
int
ns_parse_ttl(const char *src, u_long *dst) {
u_long ttl, tmp;
int ch, digits, dirty;
ttl = 0;
tmp = 0;
digits = 0;
dirty = 0;
while ((ch = *src++) != '\0') {
if (!isascii(ch) || !isprint(ch))
goto einval;
if (isdigit(ch)) {
tmp *= 10;
tmp += (ch - '0');
digits++;
continue;
}
if (digits == 0)
goto einval;
if (islower(ch))
ch = toupper(ch);
switch (ch) {
case 'W': tmp *= 7; /*FALLTHROUGH*/
case 'D': tmp *= 24; /*FALLTHROUGH*/
case 'H': tmp *= 60; /*FALLTHROUGH*/
case 'M': tmp *= 60; /*FALLTHROUGH*/
case 'S': break;
default: goto einval;
}
ttl += tmp;
tmp = 0;
digits = 0;
dirty = 1;
}
if (digits > 0) {
if (dirty)
goto einval;
else
ttl += tmp;
} else if (!dirty)
goto einval;
*dst = ttl;
return (0);
einval:
errno = EINVAL;
return (-1);
}
#endif
/* Private. */
static int
fmt1(int t, char s, char **buf, size_t *buflen) {
char tmp[50];
size_t len;
len = (size_t)snprintf(tmp, sizeof(tmp), "%d%c", t, s);
if ((int)len < 0 || len + 1 > *buflen)
return (-1);
strcpy(*buf, tmp);
*buf += len;
*buflen -= len;
return (0);
}
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