1 /* $OpenBSD: rcstime.c,v 1.5 2014/09/30 11:01:20 otto 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 31 #include "rcs.h" 32 33 void 34 rcs_set_tz(char *tz, struct rcs_delta *rdp, struct tm *tb) 35 { 36 int tzone; 37 int pos; 38 char *h, *m; 39 const char *errstr; 40 struct tm *ltb; 41 time_t now; 42 43 if (!strcmp(tz, "LT")) { 44 now = mktime(&rdp->rd_date); 45 ltb = localtime(&now); 46 ltb->tm_hour += ((int)ltb->tm_gmtoff/3600); 47 memcpy(tb, ltb, sizeof(*tb)); 48 } else { 49 pos = 0; 50 switch (*tz) { 51 case '-': 52 break; 53 case '+': 54 pos = 1; 55 break; 56 default: 57 errx(1, "%s: not a known time zone", tz); 58 } 59 60 h = (tz + 1); 61 if ((m = strrchr(tz, ':')) != NULL) 62 *(m++) = '\0'; 63 64 memcpy(tb, &rdp->rd_date, sizeof(*tb)); 65 66 tzone = strtonum(h, -23, 23, &errstr); 67 if (errstr) 68 errx(1, "%s: not a known time zone", tz); 69 70 if (pos) { 71 tb->tm_hour += tzone; 72 tb->tm_gmtoff += (tzone * 3600); 73 } else { 74 tb->tm_hour -= tzone; 75 tb->tm_gmtoff -= (tzone * 3600); 76 } 77 78 if ((tb->tm_hour >= 24) || (tb->tm_hour <= -24)) 79 tb->tm_hour = 0; 80 81 if (m != NULL) { 82 tzone = strtonum(m, 0, 59, &errstr); 83 if (errstr) 84 errx(1, "%s: not a known minute", m); 85 86 if ((tb->tm_min + tzone) >= 60) { 87 tb->tm_hour++; 88 tb->tm_min -= (60 - tzone); 89 } else 90 tb->tm_min += tzone; 91 92 tb->tm_gmtoff += (tzone*60); 93 } 94 } 95 } 96