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118 lines
3.5 KiB
C
118 lines
3.5 KiB
C
/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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* Copyright (c) 1999 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 ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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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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#include <time.h>
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#define SPRINTF(x) ((size_t)sprintf x)
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/* Forward. */
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static int datepart(const char *, int, int, int, int *);
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/* Public. */
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/*%
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* Convert a date in ASCII into the number of seconds since
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* 1 January 1970 (GMT assumed). Format is yyyymmddhhmmss, all
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* digits required, no spaces allowed.
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*/
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u_int32_t
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ns_datetosecs(const char *cp, int *errp) {
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struct tm time;
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u_int32_t result;
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int mdays, i;
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static const int days_per_month[12] =
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{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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if (strlen(cp) != 14U) {
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*errp = 1;
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return (0);
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}
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*errp = 0;
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memset(&time, 0, sizeof time);
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time.tm_year = datepart(cp + 0, 4, 1990, 9999, errp) - 1900;
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time.tm_mon = datepart(cp + 4, 2, 01, 12, errp) - 1;
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time.tm_mday = datepart(cp + 6, 2, 01, 31, errp);
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time.tm_hour = datepart(cp + 8, 2, 00, 23, errp);
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time.tm_min = datepart(cp + 10, 2, 00, 59, errp);
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time.tm_sec = datepart(cp + 12, 2, 00, 59, errp);
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if (*errp) /*%< Any parse errors? */
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return (0);
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/*
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* OK, now because timegm() is not available in all environments,
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* we will do it by hand. Roll up sleeves, curse the gods, begin!
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*/
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#define SECS_PER_DAY ((u_int32_t)24*60*60)
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#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
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result = time.tm_sec; /*%< Seconds */
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result += time.tm_min * 60; /*%< Minutes */
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result += time.tm_hour * (60*60); /*%< Hours */
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result += (time.tm_mday - 1) * SECS_PER_DAY; /*%< Days */
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/* Months are trickier. Look without leaping, then leap */
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mdays = 0;
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for (i = 0; i < time.tm_mon; i++)
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mdays += days_per_month[i];
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result += mdays * SECS_PER_DAY; /*%< Months */
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if (time.tm_mon > 1 && isleap(1900+time.tm_year))
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result += SECS_PER_DAY; /*%< Add leapday for this year */
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/* First figure years without leapdays, then add them in. */
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/* The loop is slow, FIXME, but simple and accurate. */
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result += (time.tm_year - 70) * (SECS_PER_DAY*365); /*%< Years */
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for (i = 70; i < time.tm_year; i++)
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if (isleap(1900+i))
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result += SECS_PER_DAY; /*%< Add leapday for prev year */
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return (result);
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}
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/* Private. */
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/*%
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* Parse part of a date. Set error flag if any error.
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* Don't reset the flag if there is no error.
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*/
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static int
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datepart(const char *buf, int size, int min, int max, int *errp) {
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int result = 0;
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int i;
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for (i = 0; i < size; i++) {
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if (!isdigit((unsigned char)(buf[i])))
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*errp = 1;
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result = (result * 10) + buf[i] - '0';
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}
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if (result < min)
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*errp = 1;
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if (result > max)
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*errp = 1;
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return (result);
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}
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/*! \file */
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