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Annotation of src/lib/libresolv/ns_date.c, Revision 1.1

1.1     ! christos    1: /*     $NetBSD: ns_date.c,v 1.1.1.2 2012/09/09 16:08:03 christos Exp $ */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
        !             5:  * Copyright (c) 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: #include <sys/cdefs.h>
        !            21: #if 0
        !            22: static const char rcsid[] = "Id: ns_date.c,v 1.6 2005/04/27 04:56:39 sra Exp ";
        !            23: #else
        !            24: __RCSID("$NetBSD$");
        !            25: #endif
        !            26:
        !            27: /* Import. */
        !            28:
        !            29: #include "port_before.h"
        !            30:
        !            31: #include <arpa/nameser.h>
        !            32:
        !            33: #include <ctype.h>
        !            34: #include <errno.h>
        !            35: #include <stdio.h>
        !            36: #include <string.h>
        !            37: #include <time.h>
        !            38:
        !            39: #include "port_after.h"
        !            40:
        !            41: #ifdef SPRINTF_CHAR
        !            42: # define SPRINTF(x) strlen(sprintf/**/x)
        !            43: #else
        !            44: # define SPRINTF(x) ((size_t)sprintf x)
        !            45: #endif
        !            46:
        !            47: /* Forward. */
        !            48:
        !            49: static int     datepart(const char *, int, int, int, int *);
        !            50:
        !            51: /* Public. */
        !            52:
        !            53: /*%
        !            54:  * Convert a date in ASCII into the number of seconds since
        !            55:  * 1 January 1970 (GMT assumed).  Format is yyyymmddhhmmss, all
        !            56:  * digits required, no spaces allowed.
        !            57:  */
        !            58:
        !            59: u_int32_t
        !            60: ns_datetosecs(const char *cp, int *errp) {
        !            61:        struct tm tim;
        !            62:        u_int32_t result;
        !            63:        int mdays, i;
        !            64:        static const int days_per_month[12] =
        !            65:                {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        !            66:
        !            67:        if (strlen(cp) != 14U) {
        !            68:                *errp = 1;
        !            69:                return (0);
        !            70:        }
        !            71:        *errp = 0;
        !            72:
        !            73:        memset(&tim, 0, sizeof tim);
        !            74:        tim.tm_year  = datepart(cp +  0, 4, 1990, 9999, errp) - 1900;
        !            75:        tim.tm_mon   = datepart(cp +  4, 2,   01,   12, errp) - 1;
        !            76:        tim.tm_mday  = datepart(cp +  6, 2,   01,   31, errp);
        !            77:        tim.tm_hour  = datepart(cp +  8, 2,   00,   23, errp);
        !            78:        tim.tm_min   = datepart(cp + 10, 2,   00,   59, errp);
        !            79:        tim.tm_sec   = datepart(cp + 12, 2,   00,   59, errp);
        !            80:        if (*errp)              /*%< Any parse errors? */
        !            81:                return (0);
        !            82:
        !            83:        /*
        !            84:         * OK, now because timegm() is not available in all environments,
        !            85:         * we will do it by hand.  Roll up sleeves, curse the gods, begin!
        !            86:         */
        !            87:
        !            88: #define SECS_PER_DAY    ((u_int32_t)24*60*60)
        !            89: #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
        !            90:
        !            91:        result  = tim.tm_sec;                           /*%< Seconds */
        !            92:        result += tim.tm_min * 60;                      /*%< Minutes */
        !            93:        result += tim.tm_hour * (60*60);                /*%< Hours */
        !            94:        result += (tim.tm_mday - 1) * SECS_PER_DAY;     /*%< Days */
        !            95:        /* Months are trickier.  Look without leaping, then leap */
        !            96:        mdays = 0;
        !            97:        for (i = 0; i < tim.tm_mon; i++)
        !            98:                mdays += days_per_month[i];
        !            99:        result += mdays * SECS_PER_DAY;                 /*%< Months */
        !           100:        if (tim.tm_mon > 1 && isleap(1900+tim.tm_year))
        !           101:                result += SECS_PER_DAY;         /*%< Add leapday for this year */
        !           102:        /* First figure years without leapdays, then add them in.  */
        !           103:        /* The loop is slow, FIXME, but simple and accurate.  */
        !           104:        result += (tim.tm_year - 70) * (SECS_PER_DAY*365); /*%< Years */
        !           105:        for (i = 70; i < tim.tm_year; i++)
        !           106:                if (isleap(1900+i))
        !           107:                        result += SECS_PER_DAY; /*%< Add leapday for prev year */
        !           108:        return (result);
        !           109: }
        !           110:
        !           111: /* Private. */
        !           112:
        !           113: /*%
        !           114:  * Parse part of a date.  Set error flag if any error.
        !           115:  * Don't reset the flag if there is no error.
        !           116:  */
        !           117: static int
        !           118: datepart(const char *buf, int size, int min, int max, int *errp) {
        !           119:        int result = 0;
        !           120:        int i;
        !           121:
        !           122:        for (i = 0; i < size; i++) {
        !           123:                if (!isdigit((unsigned char)(buf[i])))
        !           124:                        *errp = 1;
        !           125:                result = (result * 10) + buf[i] - '0';
        !           126:        }
        !           127:        if (result < min)
        !           128:                *errp = 1;
        !           129:        if (result > max)
        !           130:                *errp = 1;
        !           131:        return (result);
        !           132: }
        !           133:
        !           134: /*! \file */

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