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Annotation of embedaddon/dhcp/minires/ns_date.c, revision 1.1

1.1     ! misho       1: /*
        !             2:  * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
        !             3:  * Copyright (c) 1999-2003 by Internet Software Consortium
        !             4:  *
        !             5:  * Permission to use, copy, modify, and distribute this software for any
        !             6:  * purpose with or without fee is hereby granted, provided that the above
        !             7:  * copyright notice and this permission notice appear in all copies.
        !             8:  *
        !             9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
        !            10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
        !            11:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
        !            12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
        !            13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
        !            14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
        !            15:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            16:  *
        !            17:  *   Internet Systems Consortium, Inc.
        !            18:  *   950 Charter Street
        !            19:  *   Redwood City, CA 94063
        !            20:  *   <info@isc.org>
        !            21:  *   https://www.isc.org/
        !            22:  */
        !            23: 
        !            24: #ifndef lint
        !            25: static const char rcsid[] = "$Id: ns_date.c,v 1.6.310.2 2009-07-24 22:04:52 sar Exp $";
        !            26: #endif
        !            27: 
        !            28: /* Import. */
        !            29: 
        !            30: #include <ctype.h>
        !            31: #include <errno.h>
        !            32: #include <stdio.h>
        !            33: #include <string.h>
        !            34: #include <time.h>
        !            35: 
        !            36: #include <sys/types.h>
        !            37: #include <netinet/in.h>
        !            38: #include <sys/socket.h>
        !            39: 
        !            40: #include "minires/minires.h"
        !            41: #include "arpa/nameser.h"
        !            42: 
        !            43: #ifdef SPRINTF_CHAR
        !            44: # define SPRINTF(x) strlen(sprintf/**/x)
        !            45: #else
        !            46: # define SPRINTF(x) ((size_t)sprintf x)
        !            47: #endif
        !            48: 
        !            49: /* Forward. */
        !            50: 
        !            51: static int     datepart(const char *, int, int, int, int *);
        !            52: 
        !            53: /* Public. */
        !            54: 
        !            55: /* Convert a date in ASCII into the number of seconds since
        !            56:    1 January 1970 (GMT assumed).  Format is yyyymmddhhmmss, all
        !            57:    digits required, no spaces allowed.  */
        !            58: 
        !            59: u_int32_t
        !            60: ns_datetosecs(const char *cp, int *errp) {
        !            61:        struct tm time;
        !            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) != 14) {
        !            68:                *errp = 1;
        !            69:                return (0);
        !            70:        }
        !            71:        *errp = 0;
        !            72: 
        !            73:        memset(&time, 0, sizeof time);
        !            74:        time.tm_year  = datepart(cp +  0, 4, 1990, 9999, errp) - 1900;
        !            75:        time.tm_mon   = datepart(cp +  4, 2,   01,   12, errp) - 1;
        !            76:        time.tm_mday  = datepart(cp +  6, 2,   01,   31, errp);
        !            77:        time.tm_hour  = datepart(cp +  8, 2,   00,   23, errp);
        !            78:        time.tm_min   = datepart(cp + 10, 2,   00,   59, errp);
        !            79:        time.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  = time.tm_sec;                          /* Seconds */
        !            92:        result += time.tm_min * 60;                     /* Minutes */
        !            93:        result += time.tm_hour * (60*60);               /* Hours */
        !            94:        result += (time.tm_mday - 1) * SECS_PER_DAY;    /* Days */
        !            95: 
        !            96:        /* Months are trickier.  Look without leaping, then leap */
        !            97:        mdays = 0;
        !            98:        for (i = 0; i < time.tm_mon; i++)
        !            99:                mdays += days_per_month[i];
        !           100:        result += mdays * SECS_PER_DAY;                 /* Months */
        !           101:        if (time.tm_mon > 1 && isleap(1900+time.tm_year))
        !           102:                result += SECS_PER_DAY;         /* Add leapday for this year */
        !           103: 
        !           104:        /* First figure years without leapdays, then add them in.  */
        !           105:        /* The loop is slow, FIXME, but simple and accurate.  */
        !           106:        result += (time.tm_year - 70) * (SECS_PER_DAY*365); /* Years */
        !           107:        for (i = 70; i < time.tm_year; i++)
        !           108:                if (isleap(1900+i))
        !           109:                        result += SECS_PER_DAY; /* Add leapday for prev year */
        !           110: 
        !           111:        return (result);
        !           112: }
        !           113: 
        !           114: /* Private. */
        !           115: 
        !           116: /*
        !           117:  * Parse part of a date.  Set error flag if any error.
        !           118:  * Don't reset the flag if there is no error.
        !           119:  */
        !           120: static int
        !           121: datepart(const char *buf, int size, int min, int max, int *errp) {
        !           122:        int result = 0;
        !           123:        int i;
        !           124: 
        !           125:        for (i = 0; i < size; i++) {
        !           126:                if (!isdigit((unsigned char)buf[i]))
        !           127:                        *errp = 1;
        !           128:                result = (result * 10) + buf[i] - '0';
        !           129:        }
        !           130:        if (result < min)
        !           131:                *errp = 1;
        !           132:        if (result > max)
        !           133:                *errp = 1;
        !           134:        return (result);
        !           135: }