1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2010 AT&T Intellectual Property * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Intellectual Property * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #pragma prototyped 23 /* 24 * Glenn Fowler 25 * AT&T Research 26 * 27 * Time_t conversion support 28 */ 29 30 #include <tmx.h> 31 32 #include "FEATURE/tmlib" 33 34 /* 35 * return Tm_t for t 36 * time zone and leap seconds accounted for in return value 37 */ 38 39 Tm_t* 40 tmxtm(register Tm_t* tm, Time_t t, Tm_zone_t* zone) 41 { 42 register struct tm* tp; 43 register Tm_leap_t* lp; 44 Time_t x; 45 time_t now; 46 int leapsec; 47 int y; 48 uint32_t n; 49 int32_t o; 50 #if TMX_FLOAT 51 Time_t z; 52 uint32_t i; 53 #endif 54 55 tmset(tm_info.zone); 56 leapsec = 0; 57 if ((tm_info.flags & (TM_ADJUST|TM_LEAP)) == (TM_ADJUST|TM_LEAP) && (n = tmxsec(t))) 58 { 59 for (lp = &tm_data.leap[0]; n < lp->time; lp++); 60 if (lp->total) 61 { 62 if (n == lp->time && (leapsec = (lp->total - (lp+1)->total)) < 0) 63 leapsec = 0; 64 t = tmxsns(n - lp->total, tmxnsec(t)); 65 } 66 } 67 x = tmxsec(t); 68 if (!(tm->tm_zone = zone)) 69 { 70 if (tm_info.flags & TM_UTC) 71 tm->tm_zone = &tm_data.zone[2]; 72 else 73 tm->tm_zone = tm_info.zone; 74 } 75 if ((o = 60 * tm->tm_zone->west) && x > o) 76 { 77 x -= o; 78 o = 0; 79 } 80 #if TMX_FLOAT 81 i = x / (24 * 60 * 60); 82 z = i; 83 n = x - z * (24 * 60 * 60); 84 tm->tm_sec = n % 60 + leapsec; 85 n /= 60; 86 tm->tm_min = n % 60; 87 n /= 60; 88 tm->tm_hour = n % 24; 89 #define x i 90 #else 91 tm->tm_sec = x % 60 + leapsec; 92 x /= 60; 93 tm->tm_min = x % 60; 94 x /= 60; 95 tm->tm_hour = x % 24; 96 x /= 24; 97 #endif 98 tm->tm_wday = (x + 4) % 7; 99 tm->tm_year = (400 * (x + 25202)) / 146097 + 1; 100 n = tm->tm_year - 1; 101 x -= n * 365 + n / 4 - n / 100 + (n + (1900 - 1600)) / 400 - (1970 - 1901) * 365 - (1970 - 1901) / 4; 102 tm->tm_mon = 0; 103 tm->tm_mday = x + 1; 104 tm->tm_nsec = tmxnsec(t); 105 tmfix(tm); 106 n += 1900; 107 tm->tm_isdst = 0; 108 if (tm->tm_zone->daylight) 109 { 110 if ((y = tmequiv(tm) - 1900) == tm->tm_year) 111 now = tmxsec(t); 112 else 113 { 114 Tm_t te; 115 116 te = *tm; 117 te.tm_year = y; 118 now = tmxsec(tmxtime(&te, tm->tm_zone->west)); 119 } 120 if ((tp = tmlocaltime(&now)) && ((tm->tm_isdst = tp->tm_isdst) || o)) 121 { 122 tm->tm_min -= o / 60 + (tm->tm_isdst ? tm->tm_zone->dst : 0); 123 tmfix(tm); 124 } 125 } 126 return tm; 127 } 128 129 /* 130 * return Tm_t for t 131 * time zone and leap seconds accounted for in return value 132 */ 133 134 Tm_t* 135 tmxmake(Time_t t) 136 { 137 static Tm_t ts; 138 139 return tmxtm(&ts, t, NiL); 140 } 141