14887Schin /*********************************************************************** 24887Schin * * 34887Schin * This software is part of the ast package * 4*8462SApril.Chin@Sun.COM * Copyright (c) 1985-2008 AT&T Intellectual Property * 54887Schin * and is licensed under the * 64887Schin * Common Public License, Version 1.0 * 7*8462SApril.Chin@Sun.COM * by AT&T Intellectual Property * 84887Schin * * 94887Schin * A copy of the License is available at * 104887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 114887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 124887Schin * * 134887Schin * Information and Software Systems Research * 144887Schin * AT&T Research * 154887Schin * Florham Park NJ * 164887Schin * * 174887Schin * Glenn Fowler <gsf@research.att.com> * 184887Schin * David Korn <dgk@research.att.com> * 194887Schin * Phong Vo <kpv@research.att.com> * 204887Schin * * 214887Schin ***********************************************************************/ 224887Schin #pragma prototyped 234887Schin /* 244887Schin * Glenn Fowler 254887Schin * AT&T Research 264887Schin * 274887Schin * Time_t conversion support 284887Schin */ 294887Schin 304887Schin #include <tmx.h> 314887Schin 324887Schin static unsigned char offset[7][3] = 334887Schin { 344887Schin { 7, 6, 6 }, 354887Schin { 1, 7, 7 }, 364887Schin { 2, 1, 8 }, 374887Schin { 3, 2, 9 }, 384887Schin { 4, 3, 10}, 394887Schin { 5, 4, 4 }, 404887Schin { 6, 5, 5 }, 414887Schin }; 424887Schin 434887Schin /* 444887Schin * type is week type 454887Schin * 0 sunday first day of week 464887Schin * 1 monday first day of week 474887Schin * 2 monday first day of iso week 484887Schin * if week<0 then return week for tm 494887Schin * if day<0 then set tm to first day of week 504887Schin * otherwise set tm to day in week 514887Schin * and return tm->tm_yday 524887Schin */ 534887Schin 544887Schin int 554887Schin tmweek(Tm_t* tm, int type, int week, int day) 564887Schin { 574887Schin int d; 584887Schin 594887Schin if (week < 0) 604887Schin { 614887Schin if ((day = tm->tm_wday - tm->tm_yday % 7) < 0) 624887Schin day += 7; 634887Schin week = (tm->tm_yday + offset[day][type]) / 7; 644887Schin if (type == 2) 654887Schin { 664887Schin if (!week) 674887Schin week = (day > 0 && day < 6 || tmisleapyear(tm->tm_year - 1)) ? 53 : 52; 684887Schin else if (week == 53 && (tm->tm_wday + (31 - tm->tm_mday)) < 4) 694887Schin week = 1; 704887Schin } 714887Schin return week; 724887Schin } 734887Schin if (day < 0) 744887Schin day = type != 0; 754887Schin tm->tm_mon = 0; 764887Schin tm->tm_mday = 1; 774887Schin tmfix(tm); 784887Schin d = tm->tm_wday; 794887Schin tm->tm_mday = week * 7 - offset[d][type] + ((day || type != 2) ? day : 7); 804887Schin tmfix(tm); 814887Schin if (d = tm->tm_wday - day) 824887Schin { 834887Schin tm->tm_mday -= d; 844887Schin tmfix(tm); 854887Schin } 864887Schin return tm->tm_yday; 874887Schin } 88