/* $NetBSD: ns_date.c,v 1.1.1.2 2012/09/09 16:08:03 christos Exp $ */ /* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * 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 ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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 1.6 2005/04/27 04:56:39 sra Exp "; #endif /* Import. */ #include "port_before.h" #include #include #include #include #include #include #include "port_after.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) != 14U) { *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((unsigned char)(buf[i]))) *errp = 1; result = (result * 10) + buf[i] - '0'; } if (result < min) *errp = 1; if (result > max) *errp = 1; return (result); } /*! \file */