151 lines
2.9 KiB
C
151 lines
2.9 KiB
C
/*
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* Copyright (c) 1996 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/* Import. */
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#include <arpa/nameser.h>
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#include <ctype.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#define SPRINTF(x) ((size_t)sprintf x)
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/* Forward. */
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static int fmt1(int t, char s, char **buf, size_t *buflen);
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/* Macros. */
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#define T(x) if ((x) < 0) return (-1); else (void)NULL
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/* Public. */
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int
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ns_format_ttl(u_long src, char *dst, size_t dstlen) {
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char *odst = dst;
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int secs, mins, hours, days, weeks, x;
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char tmp[50], *p;
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secs = src % 60; src /= 60;
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mins = src % 60; src /= 60;
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hours = src % 24; src /= 24;
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days = src % 7; src /= 7;
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weeks = src; src = 0;
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x = 0;
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if (weeks) {
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T(fmt1(weeks, 'W', &dst, &dstlen));
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x++;
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}
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if (days) {
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T(fmt1(days, 'D', &dst, &dstlen));
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x++;
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}
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if (hours) {
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T(fmt1(hours, 'H', &dst, &dstlen));
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x++;
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}
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if (mins) {
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T(fmt1(mins, 'M', &dst, &dstlen));
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x++;
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}
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if (secs || !(weeks || days || hours || mins)) {
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T(fmt1(secs, 'S', &dst, &dstlen));
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x++;
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}
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if (x > 1) {
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int ch;
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for (p = odst; (ch = *p) != '\0'; p++)
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if (isascii(ch) && isupper(ch))
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*p = tolower(ch);
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}
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return (dst - odst);
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}
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int
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ns_parse_ttl(const char *src, u_long *dst) {
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u_long ttl, tmp;
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int ch, digits, dirty;
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ttl = 0;
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tmp = 0;
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digits = 0;
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dirty = 0;
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while ((ch = *src++) != '\0') {
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if (!isascii(ch) || !isprint(ch))
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goto einval;
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if (isdigit(ch)) {
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tmp *= 10;
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tmp += (ch - '0');
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digits++;
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continue;
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}
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if (digits == 0)
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goto einval;
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if (islower(ch))
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ch = toupper(ch);
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switch (ch) {
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case 'W': tmp *= 7;
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case 'D': tmp *= 24;
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case 'H': tmp *= 60;
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case 'M': tmp *= 60;
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case 'S': break;
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default: goto einval;
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}
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ttl += tmp;
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tmp = 0;
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digits = 0;
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dirty = 1;
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}
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if (digits > 0) {
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if (dirty)
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goto einval;
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else
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ttl += tmp;
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}
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*dst = ttl;
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return (0);
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einval:
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errno = EINVAL;
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return (-1);
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}
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/* Private. */
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static int
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fmt1(int t, char s, char **buf, size_t *buflen) {
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char tmp[50];
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size_t len;
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len = SPRINTF((tmp, "%d%c", t, s));
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if (len + 1 > *buflen)
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return (-1);
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strcpy(*buf, tmp);
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*buf += len;
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*buflen -= len;
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return (0);
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}
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