/* * Copyright (c) 1999 by Internet Software Consortium. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS * SOFTWARE. */ #ifndef lint static const char rcsid[] = "$Id: ns_date.c,v 1.1.1.1 2001/08/03 11:35:36 drochner Exp $"; #endif /* Import. */ #include #include #include #include #include #include #include #include #include "minires/minires.h" #include "arpa/nameser.h" #ifdef SPRINTF_CHAR # define SPRINTF(x) strlen(sprintf/**/x) #else # define SPRINTF(x) ((size_t)sprintf x) #endif /* Forward. */ static int datepart(const char *, int, int, int, int *); /* Public. */ /* Convert a date in ASCII into the number of seconds since 1 January 1970 (GMT assumed). Format is yyyymmddhhmmss, all digits required, no spaces allowed. */ u_int32_t ns_datetosecs(const char *cp, int *errp) { struct tm time; u_int32_t result; int mdays, i; static const int days_per_month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; if (strlen(cp) != 14) { *errp = 1; return (0); } *errp = 0; memset(&time, 0, sizeof time); time.tm_year = datepart(cp + 0, 4, 1990, 9999, errp) - 1900; time.tm_mon = datepart(cp + 4, 2, 01, 12, errp) - 1; time.tm_mday = datepart(cp + 6, 2, 01, 31, errp); time.tm_hour = datepart(cp + 8, 2, 00, 23, errp); time.tm_min = datepart(cp + 10, 2, 00, 59, errp); time.tm_sec = datepart(cp + 12, 2, 00, 59, errp); if (*errp) /* Any parse errors? */ return (0); /* * OK, now because timegm() is not available in all environments, * we will do it by hand. Roll up sleeves, curse the gods, begin! */ #define SECS_PER_DAY ((u_int32_t)24*60*60) #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0) result = time.tm_sec; /* Seconds */ result += time.tm_min * 60; /* Minutes */ result += time.tm_hour * (60*60); /* Hours */ result += (time.tm_mday - 1) * SECS_PER_DAY; /* Days */ /* Months are trickier. Look without leaping, then leap */ mdays = 0; for (i = 0; i < time.tm_mon; i++) mdays += days_per_month[i]; result += mdays * SECS_PER_DAY; /* Months */ if (time.tm_mon > 1 && isleap(1900+time.tm_year)) result += SECS_PER_DAY; /* Add leapday for this year */ /* First figure years without leapdays, then add them in. */ /* The loop is slow, FIXME, but simple and accurate. */ result += (time.tm_year - 70) * (SECS_PER_DAY*365); /* Years */ for (i = 70; i < time.tm_year; i++) if (isleap(1900+i)) result += SECS_PER_DAY; /* Add leapday for prev year */ return (result); } /* Private. */ /* * Parse part of a date. Set error flag if any error. * Don't reset the flag if there is no error. */ static int datepart(const char *buf, int size, int min, int max, int *errp) { int result = 0; int i; for (i = 0; i < size; i++) { if (!isdigit(buf[i])) *errp = 1; result = (result * 10) + buf[i] - '0'; } if (result < min) *errp = 1; if (result > max) *errp = 1; return (result); }