/crypto/heimdal/lib/roken/timegm.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 85 lines · 41 code · 8 blank · 36 comment · 18 complexity · 04ef3afb0f83fdd3eaedb98d92600542 MD5 · raw file
- /*
- * Copyright (c) 1997, 2006 Kungliga Tekniska Hรถgskolan
- * (Royal Institute of Technology, Stockholm, Sweden).
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. Neither the name of the Institute nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <config.h>
- #include "roken.h"
- static int
- is_leap(unsigned y)
- {
- y += 1900;
- return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0);
- }
- /*
- * XXX This is a simplifed version of timegm, it needs to support out of
- * bounds values.
- */
- time_t
- rk_timegm (struct tm *tm)
- {
- static const unsigned ndays[2][12] ={
- {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
- {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}};
- time_t res = 0;
- unsigned i;
- if (tm->tm_year < 0)
- return -1;
- if (tm->tm_mon < 0 || tm->tm_mon > 11)
- return -1;
- if (tm->tm_mday < 1 || tm->tm_mday > ndays[is_leap(tm->tm_year)][tm->tm_mon])
- return -1;
- if (tm->tm_hour < 0 || tm->tm_hour > 23)
- return -1;
- if (tm->tm_min < 0 || tm->tm_min > 59)
- return -1;
- if (tm->tm_sec < 0 || tm->tm_sec > 59)
- return -1;
- for (i = 70; i < tm->tm_year; ++i)
- res += is_leap(i) ? 366 : 365;
- for (i = 0; i < tm->tm_mon; ++i)
- res += ndays[is_leap(tm->tm_year)][i];
- res += tm->tm_mday - 1;
- res *= 24;
- res += tm->tm_hour;
- res *= 60;
- res += tm->tm_min;
- res *= 60;
- res += tm->tm_sec;
- return res;
- }