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Diffstat (limited to 'gnu/usr.bin/rcs/lib/maketime.c')
| -rw-r--r-- | gnu/usr.bin/rcs/lib/maketime.c | 344 |
1 files changed, 0 insertions, 344 deletions
diff --git a/gnu/usr.bin/rcs/lib/maketime.c b/gnu/usr.bin/rcs/lib/maketime.c deleted file mode 100644 index 0f83bf5..0000000 --- a/gnu/usr.bin/rcs/lib/maketime.c +++ /dev/null @@ -1,344 +0,0 @@ -/* Convert struct partime into time_t. */ - -/* Copyright 1992, 1993, 1994, 1995 Paul Eggert - Distributed under license by the Free Software Foundation, Inc. - -This file is part of RCS. - -RCS is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -RCS is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -GNU General Public License for more details. - -You should have received a copy of the GNU General Public License -along with RCS; see the file COPYING. -If not, write to the Free Software Foundation, -59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - -Report problems and direct all questions to: - - rcs-bugs@cs.purdue.edu - -*/ - -#if has_conf_h -# include "conf.h" -#else -# ifdef __STDC__ -# define P(x) x -# else -# define const -# define P(x) () -# endif -# include <stdlib.h> -# include <time.h> -#endif - -#include "partime.h" -#include "maketime.h" - -char const maketId[] - = "$FreeBSD$"; - -static int isleap P((int)); -static int month_days P((struct tm const*)); -static time_t maketime P((struct partime const*,time_t)); - -/* -* For maximum portability, use only localtime and gmtime. -* Make no assumptions about the time_t epoch or the range of time_t values. -* Avoid mktime because it's not universal and because there's no easy, -* portable way for mktime to yield the inverse of gmtime. -*/ - -#define TM_YEAR_ORIGIN 1900 - - static int -isleap(y) - int y; -{ - return (y&3) == 0 && (y%100 != 0 || y%400 == 0); -} - -static int const month_yday[] = { - /* days in year before start of months 0-12 */ - 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 -}; - -/* Yield the number of days in TM's month. */ - static int -month_days(tm) - struct tm const *tm; -{ - int m = tm->tm_mon; - return month_yday[m+1] - month_yday[m] - + (m==1 && isleap(tm->tm_year + TM_YEAR_ORIGIN)); -} - -/* -* Convert UNIXTIME to struct tm form. -* Use gmtime if available and if !LOCALZONE, localtime otherwise. -*/ - struct tm * -time2tm(unixtime, localzone) - time_t unixtime; - int localzone; -{ - struct tm *tm; -# if TZ_must_be_set - static char const *TZ; - if (!TZ && !(TZ = getenv("TZ"))) - faterror("The TZ environment variable is not set; please set it to your timezone"); -# endif - if (localzone || !(tm = gmtime(&unixtime))) - tm = localtime(&unixtime); - return tm; -} - -/* Yield A - B, measured in seconds. */ - time_t -difftm(a, b) - struct tm const *a, *b; -{ - int ay = a->tm_year + (TM_YEAR_ORIGIN - 1); - int by = b->tm_year + (TM_YEAR_ORIGIN - 1); - int difference_in_day_of_year = a->tm_yday - b->tm_yday; - int intervening_leap_days = ( - ((ay >> 2) - (by >> 2)) - - (ay/100 - by/100) - + ((ay/100 >> 2) - (by/100 >> 2)) - ); - time_t difference_in_years = ay - by; - time_t difference_in_days = ( - difference_in_years*365 - + (intervening_leap_days + difference_in_day_of_year) - ); - return - ( - ( - 24*difference_in_days - + (a->tm_hour - b->tm_hour) - )*60 + (a->tm_min - b->tm_min) - )*60 + (a->tm_sec - b->tm_sec); -} - -/* -* Adjust time T by adding SECONDS. SECONDS must be at most 24 hours' worth. -* Adjust only T's year, mon, mday, hour, min and sec members; -* plus adjust wday if it is defined. -*/ - void -adjzone(t, seconds) - register struct tm *t; - long seconds; -{ - /* - * This code can be off by a second if SECONDS is not a multiple of 60, - * if T is local time, and if a leap second happens during this minute. - * But this bug has never occurred, and most likely will not ever occur. - * Liberia, the last country for which SECONDS % 60 was nonzero, - * switched to UTC in May 1972; the first leap second was in June 1972. - */ - int leap_second = t->tm_sec == 60; - long sec = seconds + (t->tm_sec - leap_second); - if (sec < 0) { - if ((t->tm_min -= (59-sec)/60) < 0) { - if ((t->tm_hour -= (59-t->tm_min)/60) < 0) { - t->tm_hour += 24; - if (TM_DEFINED(t->tm_wday) && --t->tm_wday < 0) - t->tm_wday = 6; - if (--t->tm_mday <= 0) { - if (--t->tm_mon < 0) { - --t->tm_year; - t->tm_mon = 11; - } - t->tm_mday = month_days(t); - } - } - t->tm_min += 24 * 60; - } - sec += 24L * 60 * 60; - } else - if (60 <= (t->tm_min += sec/60)) - if (24 <= (t->tm_hour += t->tm_min/60)) { - t->tm_hour -= 24; - if (TM_DEFINED(t->tm_wday) && ++t->tm_wday == 7) - t->tm_wday = 0; - if (month_days(t) < ++t->tm_mday) { - if (11 < ++t->tm_mon) { - ++t->tm_year; - t->tm_mon = 0; - } - t->tm_mday = 1; - } - } - t->tm_min %= 60; - t->tm_sec = (int) (sec%60) + leap_second; -} - -/* -* Convert TM to time_t, using localtime if LOCALZONE and gmtime otherwise. -* Use only TM's year, mon, mday, hour, min, and sec members. -* Ignore TM's old tm_yday and tm_wday, but fill in their correct values. -* Yield -1 on failure (e.g. a member out of range). -* Posix 1003.1-1990 doesn't allow leap seconds, but some implementations -* have them anyway, so allow them if localtime/gmtime does. -*/ - time_t -tm2time(tm, localzone) - struct tm *tm; - int localzone; -{ - /* Cache the most recent t,tm pairs; 1 for gmtime, 1 for localtime. */ - static time_t t_cache[2]; - static struct tm tm_cache[2]; - - time_t d, gt; - struct tm const *gtm; - /* - * The maximum number of iterations should be enough to handle any - * combinations of leap seconds, time zone rule changes, and solar time. - * 4 is probably enough; we use a bigger number just to be safe. - */ - int remaining_tries = 8; - - /* Avoid subscript errors. */ - if (12 <= (unsigned)tm->tm_mon) - return -1; - - tm->tm_yday = month_yday[tm->tm_mon] + tm->tm_mday - - (tm->tm_mon<2 || ! isleap(tm->tm_year + TM_YEAR_ORIGIN)); - - /* Make a first guess. */ - gt = t_cache[localzone]; - gtm = gt ? &tm_cache[localzone] : time2tm(gt,localzone); - - /* Repeatedly use the error from the guess to improve the guess. */ - while ((d = difftm(tm, gtm)) != 0) { - if (--remaining_tries == 0) - return -1; - gt += d; - gtm = time2tm(gt,localzone); - } - t_cache[localzone] = gt; - tm_cache[localzone] = *gtm; - - /* - * Check that the guess actually matches; - * overflow can cause difftm to yield 0 even on differing times, - * or tm may have members out of range (e.g. bad leap seconds). - */ - if ( (tm->tm_year ^ gtm->tm_year) - | (tm->tm_mon ^ gtm->tm_mon) - | (tm->tm_mday ^ gtm->tm_mday) - | (tm->tm_hour ^ gtm->tm_hour) - | (tm->tm_min ^ gtm->tm_min) - | (tm->tm_sec ^ gtm->tm_sec)) - return -1; - - tm->tm_wday = gtm->tm_wday; - return gt; -} - -/* -* Check *PT and convert it to time_t. -* If it is incompletely specified, use DEFAULT_TIME to fill it out. -* Use localtime if PT->zone is the special value TM_LOCAL_ZONE. -* Yield -1 on failure. -* ISO 8601 day-of-year and week numbers are not yet supported. -*/ - static time_t -maketime(pt, default_time) - struct partime const *pt; - time_t default_time; -{ - int localzone, wday; - struct tm tm; - struct tm *tm0 = 0; - time_t r; - - tm0 = 0; /* Keep gcc -Wall happy. */ - localzone = pt->zone==TM_LOCAL_ZONE; - - tm = pt->tm; - - if (TM_DEFINED(pt->ymodulus) || !TM_DEFINED(tm.tm_year)) { - /* Get tm corresponding to current time. */ - tm0 = time2tm(default_time, localzone); - if (!localzone) - adjzone(tm0, pt->zone); - } - - if (TM_DEFINED(pt->ymodulus)) - tm.tm_year += - (tm0->tm_year + TM_YEAR_ORIGIN)/pt->ymodulus * pt->ymodulus; - else if (!TM_DEFINED(tm.tm_year)) { - /* Set default year, month, day from current time. */ - tm.tm_year = tm0->tm_year + TM_YEAR_ORIGIN; - if (!TM_DEFINED(tm.tm_mon)) { - tm.tm_mon = tm0->tm_mon; - if (!TM_DEFINED(tm.tm_mday)) - tm.tm_mday = tm0->tm_mday; - } - } - - /* Convert from partime year (Gregorian) to Posix year. */ - tm.tm_year -= TM_YEAR_ORIGIN; - - /* Set remaining default fields to be their minimum values. */ - if (!TM_DEFINED(tm.tm_mon)) tm.tm_mon = 0; - if (!TM_DEFINED(tm.tm_mday)) tm.tm_mday = 1; - if (!TM_DEFINED(tm.tm_hour)) tm.tm_hour = 0; - if (!TM_DEFINED(tm.tm_min)) tm.tm_min = 0; - if (!TM_DEFINED(tm.tm_sec)) tm.tm_sec = 0; - - if (!localzone) - adjzone(&tm, -pt->zone); - wday = tm.tm_wday; - - /* Convert and fill in the rest of the tm. */ - r = tm2time(&tm, localzone); - - /* Check weekday. */ - if (r != -1 && TM_DEFINED(wday) && wday != tm.tm_wday) - return -1; - - return r; -} - -/* Parse a free-format date in SOURCE, yielding a Unix format time. */ - time_t -str2time(source, default_time, default_zone) - char const *source; - time_t default_time; - long default_zone; -{ - struct partime pt; - - if (*partime(source, &pt)) - return -1; - if (pt.zone == TM_UNDEFINED_ZONE) - pt.zone = default_zone; - return maketime(&pt, default_time); -} - -#if TEST -#include <stdio.h> - int -main(argc, argv) int argc; char **argv; -{ - time_t default_time = time((time_t *)0); - long default_zone = argv[1] ? atol(argv[1]) : 0; - char buf[1000]; - while (fgets(buf, 1000, stdin)) { - time_t t = str2time(buf, default_time, default_zone); - printf("%s", asctime(gmtime(&t))); - } - return 0; -} -#endif |
