1/* $OpenBSD: rcstime.c,v 1.6 2016/08/26 09:02:54 guenther Exp $ */ 2/* 3 * Copyright (c) 2006 Joris Vink <joris@openbsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. The name of the author may not be used to endorse or promote products 13 * derived from this software without specific prior written permission. 14 * 15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 16 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 17 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 18 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 21 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 22 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 23 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 24 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include <err.h> 28#include <stdlib.h> 29#include <string.h> 30#include <time.h> 31 32#include "rcs.h" 33 34void 35rcs_set_tz(char *tz, struct rcs_delta *rdp, struct tm *tb) 36{ 37 int tzone; 38 int pos; 39 char *h, *m; 40 const char *errstr; 41 struct tm *ltb; 42 time_t now; 43 44 if (!strcmp(tz, "LT")) { 45 now = mktime(&rdp->rd_date); 46 ltb = localtime(&now); 47 ltb->tm_hour += ((int)ltb->tm_gmtoff/3600); 48 memcpy(tb, ltb, sizeof(*tb)); 49 } else { 50 pos = 0; 51 switch (*tz) { 52 case '-': 53 break; 54 case '+': 55 pos = 1; 56 break; 57 default: 58 errx(1, "%s: not a known time zone", tz); 59 } 60 61 h = (tz + 1); 62 if ((m = strrchr(tz, ':')) != NULL) 63 *(m++) = '\0'; 64 65 memcpy(tb, &rdp->rd_date, sizeof(*tb)); 66 67 tzone = strtonum(h, -23, 23, &errstr); 68 if (errstr) 69 errx(1, "%s: not a known time zone", tz); 70 71 if (pos) { 72 tb->tm_hour += tzone; 73 tb->tm_gmtoff += (tzone * 3600); 74 } else { 75 tb->tm_hour -= tzone; 76 tb->tm_gmtoff -= (tzone * 3600); 77 } 78 79 if ((tb->tm_hour >= 24) || (tb->tm_hour <= -24)) 80 tb->tm_hour = 0; 81 82 if (m != NULL) { 83 tzone = strtonum(m, 0, 59, &errstr); 84 if (errstr) 85 errx(1, "%s: not a known minute", m); 86 87 if ((tb->tm_min + tzone) >= 60) { 88 tb->tm_hour++; 89 tb->tm_min -= (60 - tzone); 90 } else 91 tb->tm_min += tzone; 92 93 tb->tm_gmtoff += (tzone*60); 94 } 95 } 96} 97