2 * Copyright (c) 1999 by Internet Software Consortium.
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.
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
19 static const char rcsid[] = "$Id: ns_date.c,v 1.2 2000/04/11 01:58:39 mellon Exp $";
30 #include <sys/types.h>
31 #include <netinet/in.h>
32 #include <sys/socket.h>
34 #include "minires/minires.h"
35 #include "arpa/nameser.h"
38 # define SPRINTF(x) strlen(sprintf/**/x)
40 # define SPRINTF(x) ((size_t)sprintf x)
45 static int datepart(const char *, int, int, int, int *);
49 /* Convert a date in ASCII into the number of seconds since
50 1 January 1970 (GMT assumed). Format is yyyymmddhhmmss, all
51 digits required, no spaces allowed. */
54 ns_datetosecs(const char *cp, int *errp) {
58 static const int days_per_month[12] =
59 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
61 if (strlen(cp) != 14) {
67 memset(&time, 0, sizeof time);
68 time.tm_year = datepart(cp + 0, 4, 1990, 9999, errp) - 1900;
69 time.tm_mon = datepart(cp + 4, 2, 01, 12, errp) - 1;
70 time.tm_mday = datepart(cp + 6, 2, 01, 31, errp);
71 time.tm_hour = datepart(cp + 8, 2, 00, 23, errp);
72 time.tm_min = datepart(cp + 10, 2, 00, 59, errp);
73 time.tm_sec = datepart(cp + 12, 2, 00, 59, errp);
74 if (*errp) /* Any parse errors? */
78 * OK, now because timegm() is not available in all environments,
79 * we will do it by hand. Roll up sleeves, curse the gods, begin!
82 #define SECS_PER_DAY ((u_int32_t)24*60*60)
83 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
85 result = time.tm_sec; /* Seconds */
86 result += time.tm_min * 60; /* Minutes */
87 result += time.tm_hour * (60*60); /* Hours */
88 result += (time.tm_mday - 1) * SECS_PER_DAY; /* Days */
90 /* Months are trickier. Look without leaping, then leap */
92 for (i = 0; i < time.tm_mon; i++)
93 mdays += days_per_month[i];
94 result += mdays * SECS_PER_DAY; /* Months */
95 if (time.tm_mon > 1 && isleap(1900+time.tm_year))
96 result += SECS_PER_DAY; /* Add leapday for this year */
98 /* First figure years without leapdays, then add them in. */
99 /* The loop is slow, FIXME, but simple and accurate. */
100 result += (time.tm_year - 70) * (SECS_PER_DAY*365); /* Years */
101 for (i = 70; i < time.tm_year; i++)
103 result += SECS_PER_DAY; /* Add leapday for prev year */
111 * Parse part of a date. Set error flag if any error.
112 * Don't reset the flag if there is no error.
115 datepart(const char *buf, int size, int min, int max, int *errp) {
119 for (i = 0; i < size; i++) {
120 if (!isdigit(buf[i]))
122 result = (result * 10) + buf[i] - '0';