contrib/bind-9.2.4rc7/lib/bind/nameser/ns_date.c

   1 /*
   2  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
   3  * Copyright (c) 1999 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
  18 #ifndef lint
  19 static const char rcsid[] = "$Id: ns_date.c,v 1.3.2.2 2004/03/16 12:35:32 marka Exp $";
  20 #endif
  21
  22 /* Import. */
  23
  24 #include "port_before.h"
  25
  26 #include <arpa/nameser.h>
  27
  28 #include <ctype.h>
  29 #include <errno.h>
  30 #include <stdio.h>
  31 #include <string.h>
  32 #include <time.h>
  33
  34 #include "port_after.h"
  35
  36 #ifdef SPRINTF_CHAR
  37 # define SPRINTF(x) strlen(sprintf/**/x)
  38 #else
  39 # define SPRINTF(x) ((size_t)sprintf x)
  40 #endif
  41
  42 /* Forward. */
  43
  44 static int      datepart(const char *, int, int, int, int *);
  45
  46 /* Public. */
  47
  48 /* Convert a date in ASCII into the number of seconds since
  49    1 January 1970 (GMT assumed).  Format is yyyymmddhhmmss, all
  50    digits required, no spaces allowed.  */
  51
  52 u_int32_t
  53 ns_datetosecs(const char *cp, int *errp) {
  54         struct tm time;
  55         u_int32_t result;
  56         int mdays, i;
  57         static const int days_per_month[12] =
  58                 {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
  59
  60         if (strlen(cp) != 14U) {
  61                 *errp = 1;
  62                 return (0);
  63         }
  64         *errp = 0;
  65
  66         memset(&time, 0, sizeof time);
  67         time.tm_year  = datepart(cp +  0, 4, 1990, 9999, errp) - 1900;
  68         time.tm_mon   = datepart(cp +  4, 2,   01,   12, errp) - 1;
  69         time.tm_mday  = datepart(cp +  6, 2,   01,   31, errp);
  70         time.tm_hour  = datepart(cp +  8, 2,   00,   23, errp);
  71         time.tm_min   = datepart(cp + 10, 2,   00,   59, errp);
  72         time.tm_sec   = datepart(cp + 12, 2,   00,   59, errp);
  73         if (*errp)              /* Any parse errors? */
  74                 return (0);
  75
  76         /*
  77          * OK, now because timegm() is not available in all environments,
  78          * we will do it by hand.  Roll up sleeves, curse the gods, begin!
  79          */
  80
  81 #define SECS_PER_DAY    ((u_int32_t)24*60*60)
  82 #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
  83
  84         result  = time.tm_sec;                          /* Seconds */
  85         result += time.tm_min * 60;                     /* Minutes */
  86         result += time.tm_hour * (60*60);               /* Hours */
  87         result += (time.tm_mday - 1) * SECS_PER_DAY;    /* Days */
  88
  89         /* Months are trickier.  Look without leaping, then leap */
  90         mdays = 0;
  91         for (i = 0; i < time.tm_mon; i++)
  92                 mdays += days_per_month[i];
  93         result += mdays * SECS_PER_DAY;                 /* Months */
  94         if (time.tm_mon > 1 && isleap(1900+time.tm_year))
  95                 result += SECS_PER_DAY;         /* Add leapday for this year */
  96
  97         /* First figure years without leapdays, then add them in.  */
  98         /* The loop is slow, FIXME, but simple and accurate.  */
  99         result += (time.tm_year - 70) * (SECS_PER_DAY*365); /* Years */
 100         for (i = 70; i < time.tm_year; i++)
 101                 if (isleap(1900+i))
 102                         result += SECS_PER_DAY; /* Add leapday for prev year */
 103
 104         return (result);
 105 }
 106
 107 /* Private. */
 108
 109 /*
 110  * Parse part of a date.  Set error flag if any error.
 111  * Don't reset the flag if there is no error.
 112  */
 113 static int
 114 datepart(const char *buf, int size, int min, int max, int *errp) {
 115         int result = 0;
 116         int i;
 117
 118         for (i = 0; i < size; i++) {
 119                 if (!isdigit((unsigned char)(buf[i])))
 120                         *errp = 1;
 121                 result = (result * 10) + buf[i] - '0';
 122         }
 123         if (result < min)
 124                 *errp = 1;
 125         if (result > max)
 126                 *errp = 1;
 127         return (result);
 128 }