+++ /dev/null
-
-/*
- * dtime.c -- time/date routines
- *
- * $Id$
- */
-
-#include "h/mh.h" /* for snprintf() */
-#include <h/nmh.h>
-#include <tws.h>
-
-#if !defined(HAVE_TM_GMTOFF) && !defined(HAVE_TZSET)
-# include <sys/timeb.h>
-#endif
-
-#ifdef TIME_WITH_SYS_TIME
-# include <sys/time.h>
-# include <time.h>
-#else
-# ifdef HAVE_SYS_TIME_H
-# include <sys/time.h>
-# else
-# include <time.h>
-# endif
-#endif
-
-#if !defined(HAVE_TM_GMTOFF) && defined(HAVE_TZSET)
-extern int daylight;
-extern long timezone;
-extern char *tzname[];
-#endif
-
-#ifndef abs
-# define abs(a) (a >= 0 ? a : -a)
-#endif
-
-/*
- * The number of days in the year, accounting for leap years
- */
-#define dysize(y) \
- (((y) % 4) ? 365 : (((y) % 100) ? 366 : (((y) % 400) ? 365 : 366)))
-
-char *tw_moty[] = {
- "Jan", "Feb", "Mar", "Apr",
- "May", "Jun", "Jul", "Aug",
- "Sep", "Oct", "Nov", "Dec",
- NULL
-};
-
-char *tw_dotw[] = {
- "Sun", "Mon", "Tue",
- "Wed", "Thu", "Fri",
- "Sat", NULL
-};
-
-char *tw_ldotw[] = {
- "Sunday", "Monday", "Tuesday",
- "Wednesday", "Thursday", "Friday",
- "Saturday", NULL
-};
-
-struct zone {
- char *std;
- char *dst;
- int shift;
-};
-
-static struct zone zones[] = {
- { "GMT", "BST", 0 },
- { "EST", "EDT", -5 },
- { "CST", "CDT", -6 },
- { "MST", "MDT", -7 },
- { "PST", "PDT", -8 },
-#if 0
-/* RFC1123 specifies do not use military TZs */
- { "A", NULL, -1 },
- { "B", NULL, -2 },
- { "C", NULL, -3 },
- { "D", NULL, -4 },
- { "E", NULL, -5 },
- { "F", NULL, -6 },
- { "G", NULL, -7 },
- { "H", NULL, -8 },
- { "I", NULL, -9 },
- { "K", NULL, -10 },
- { "L", NULL, -11 },
- { "M", NULL, -12 },
- { "N", NULL, 1 },
-#ifndef HUJI
- { "O", NULL, 2 },
-#else
- { "JST", "JDT", 2 },
-#endif
- { "P", NULL, 3 },
- { "Q", NULL, 4 },
- { "R", NULL, 5 },
- { "S", NULL, 6 },
- { "T", NULL, 7 },
- { "U", NULL, 8 },
- { "V", NULL, 9 },
- { "W", NULL, 10 },
- { "X", NULL, 11 },
- { "Y", NULL, 12 },
-#endif
- { NULL, NULL, 0 }
-};
-
-static int dmsize[] = {
- 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
-};
-
-
-/*
- * Get current time (adjusted for local time
- * zone and daylight savings time) expressed
- * as nmh "broken-down" time structure.
- */
-
-struct tws *
-dlocaltimenow (void)
-{
- time_t clock;
-
- time (&clock);
- return dlocaltime (&clock);
-}
-
-
-/*
- * Take clock value and return pointer to nmh time structure
- * containing "broken-down" time. The time is adjusted for
- * local time zone and daylight savings time.
- */
-
-struct tws *
-dlocaltime (time_t *clock)
-{
- static struct tws tw;
- struct tm *tm;
-
-#if !defined(HAVE_TM_GMTOFF) && !defined(HAVE_TZSET)
- struct timeb tb;
-#endif
-
- if (!clock)
- return NULL;
-
- tm = localtime (clock);
-
- tw.tw_sec = tm->tm_sec;
- tw.tw_min = tm->tm_min;
- tw.tw_hour = tm->tm_hour;
- tw.tw_mday = tm->tm_mday;
- tw.tw_mon = tm->tm_mon;
-
- /*
- * tm_year is always "year - 1900".
- * So we correct for this.
- */
- tw.tw_year = tm->tm_year + 1900;
- tw.tw_wday = tm->tm_wday;
- tw.tw_yday = tm->tm_yday;
-
- tw.tw_flags = TW_NULL;
- if (tm->tm_isdst)
- tw.tw_flags |= TW_DST;
-
-#ifdef HAVE_TM_GMTOFF
- tw.tw_zone = tm->tm_gmtoff / 60;
- if (tm->tm_isdst) /* if DST is in effect */
- tw.tw_zone -= 60; /* reset to normal offset */
-#else
-# ifdef HAVE_TZSET
- tzset();
- tw.tw_zone = -(timezone / 60);
-# else
- ftime (&tb);
- tw.tw_zone = -tb.timezone;
-# endif
-#endif
-
- tw.tw_flags &= ~TW_SDAY;
- tw.tw_flags |= TW_SEXP;
- tw.tw_flags &= ~TW_SZONE;
- tw.tw_flags |= TW_SZEXP;
-
- tw.tw_clock = *clock;
-
- return (&tw);
-}
-
-
-/*
- * Take clock value and return pointer to nmh time
- * structure containing "broken-down" time. Time is
- * expressed in UTC (Coordinated Universal Time).
- */
-
-struct tws *
-dgmtime (time_t *clock)
-{
- static struct tws tw;
- struct tm *tm;
-
- if (!clock)
- return NULL;
-
- tm = gmtime (clock);
-
- tw.tw_sec = tm->tm_sec;
- tw.tw_min = tm->tm_min;
- tw.tw_hour = tm->tm_hour;
- tw.tw_mday = tm->tm_mday;
- tw.tw_mon = tm->tm_mon;
-
- /*
- * tm_year is always "year - 1900"
- * So we correct for this.
- */
- tw.tw_year = tm->tm_year + 1900;
- tw.tw_wday = tm->tm_wday;
- tw.tw_yday = tm->tm_yday;
-
- tw.tw_flags = TW_NULL;
- if (tm->tm_isdst)
- tw.tw_flags |= TW_DST;
-
- tw.tw_zone = 0;
-
- tw.tw_flags &= ~TW_SDAY;
- tw.tw_flags |= TW_SEXP;
- tw.tw_flags &= ~TW_SZONE;
- tw.tw_flags |= TW_SZEXP;
-
- tw.tw_clock = *clock;
-
- return (&tw);
-}
-
-
-/*
- * Using a nmh "broken-down" time structure,
- * produce a 26-byte date/time string, such as
- *
- * Tue Jan 14 17:49:03 1992\n\0
- */
-
-char *
-dctime (struct tws *tw)
-{
- static char buffer[26];
-
- if (!tw)
- return NULL;
-
- snprintf (buffer, sizeof(buffer), "%.3s %.3s %02d %02d:%02d:%02d %.4d\n",
- tw_dotw[tw->tw_wday], tw_moty[tw->tw_mon], tw->tw_mday,
- tw->tw_hour, tw->tw_min, tw->tw_sec,
- tw->tw_year < 100 ? tw->tw_year + 1900 : tw->tw_year);
-
- return buffer;
-}
-
-
-/*
- * Produce a date/time string of the form
- *
- * Mon, 16 Jun 1992 15:30:48 -700 (or)
- * Mon, 16 Jun 1992 15:30:48 EDT
- *
- * for the current time, as specified by rfc822.
- * The first form is required by rfc1123.
- */
-
-char *
-dtimenow (int alpha_timezone)
-{
- time_t clock;
-
- time (&clock);
- return dtime (&clock, alpha_timezone);
-}
-
-
-/*
- * Using a local calendar time value, produce
- * a date/time string of the form
- *
- * Mon, 16 Jun 1992 15:30:48 -700 (or)
- * Mon, 16 Jun 1992 15:30:48 EDT
- *
- * as specified by rfc822. The first form is required
- * by rfc1123 for outgoing messages.
- */
-
-char *
-dtime (time_t *clock, int alpha_timezone)
-{
- if (alpha_timezone)
- /* use alpha-numeric timezones */
- return dasctime (dlocaltime (clock), TW_NULL);
- else
- /* use numeric timezones */
- return dasctime (dlocaltime (clock), TW_ZONE);
-}
-
-
-/*
- * Using a nmh "broken-down" time structure, produce
- * a date/time string of the form
- *
- * Mon, 16 Jun 1992 15:30:48 -0700
- *
- * as specified by rfc822 and rfc1123.
- */
-
-char *
-dasctime (struct tws *tw, int flags)
-{
- char buffer[80];
- static char result[80];
-
- if (!tw)
- return NULL;
-
- /* Display timezone if known */
- if ((tw->tw_flags & TW_SZONE) == TW_SZNIL)
- result[0] = '\0';
- else
- snprintf(result, sizeof(result), " %s", dtimezone(tw->tw_zone, tw->tw_flags | flags));
-
- snprintf(buffer, sizeof(buffer), "%02d %s %0*d %02d:%02d:%02d%s",
- tw->tw_mday, tw_moty[tw->tw_mon],
- tw->tw_year < 100 ? 2 : 4, tw->tw_year,
- tw->tw_hour, tw->tw_min, tw->tw_sec, result);
-
- if ((tw->tw_flags & TW_SDAY) == TW_SEXP)
- snprintf (result, sizeof(result), "%s, %s", tw_dotw[tw->tw_wday], buffer);
- else
- if ((tw->tw_flags & TW_SDAY) == TW_SNIL)
- strncpy (result, buffer, sizeof(result));
- else
- snprintf (result, sizeof(result), "%s (%s)", buffer, tw_dotw[tw->tw_wday]);
-
- return result;
-}
-
-
-/*
- * Get the timezone for given offset
- */
-
-char *
-dtimezone (int offset, int flags)
-{
- int hours, mins;
- struct zone *z;
- static char buffer[10];
-
- if (offset < 0) {
- mins = -((-offset) % 60);
- hours = -((-offset) / 60);
- } else {
- mins = offset % 60;
- hours = offset / 60;
- }
-
- if (!(flags & TW_ZONE) && mins == 0) {
-#if defined(HAVE_TZSET) && defined(HAVE_TZNAME)
- tzset();
- return ((flags & TW_DST) ? tzname[1] : tzname[0]);
-#else
- for (z = zones; z->std; z++)
- if (z->shift == hours)
- return (z->dst && (flags & TW_DST) ? z->dst : z->std);
-#endif
- }
-
-#if defined(DSTXXX)
- if (flags & TW_DST)
- hours += 1;
-#endif /* defined(DSTXXX) */
- snprintf (buffer, sizeof(buffer), "%s%02d%02d",
- offset < 0 ? "-" : "+", abs (hours), abs (mins));
- return buffer;
-}
-
-
-/*
- * Convert nmh time structure for local "broken-down"
- * time to calendar time (clock value). This routine
- * is based on the gtime() routine written by Steven Shafer
- * at CMU. It was forwarded to MTR by Jay Lepreau at Utah-CS.
- */
-
-time_t
-dmktime (struct tws *tw)
-{
- int i, sec, min, hour, mday, mon, year;
- time_t result;
-
- if (tw->tw_clock != 0)
- return tw->tw_clock;
-
- if ((sec = tw->tw_sec) < 0 || sec > 61
- || (min = tw->tw_min) < 0 || min > 59
- || (hour = tw->tw_hour) < 0 || hour > 23
- || (mday = tw->tw_mday) < 1 || mday > 31
- || (mon = tw->tw_mon + 1) < 1 || mon > 12)
- return (tw->tw_clock = (time_t) -1);
-
- year = tw->tw_year;
-
- result = 0;
- if (year < 100)
- year += 1900;
-
- for (i = 1970; i < year; i++)
- result += dysize (i);
- if (dysize (year) == 366 && mon >= 3)
- result++;
- while (--mon)
- result += dmsize[mon - 1];
- result += mday - 1;
- result = 24 * result + hour;
- result = 60 * result + min;
- result = 60 * result + sec;
- result -= 60 * tw->tw_zone;
- if (tw->tw_flags & TW_DST)
- result -= 60 * 60;
-
- return (tw->tw_clock = result);
-}
-
-
-/*
- * Simple calculation of day of the week. Algorithm
- * used is Zeller's congruence. We assume that
- * if tw->tw_year < 100, then the century = 19.
- */
-
-void
-set_dotw (struct tws *tw)
-{
- int month, day, year, century;
-
- month = tw->tw_mon - 1;
- day = tw->tw_mday;
- year = tw->tw_year % 100;
- century = tw->tw_year < 100 ? 19 : tw->tw_year / 100;
-
- if (month <= 0) {
- month += 12;
- if (--year < 0) {
- year += 100;
- century--;
- }
- }
-
- tw->tw_wday =
- ((26 * month - 2) / 10 + day + year + year / 4
- - 3 * century / 4 + 1) % 7;
- if (tw->tw_wday < 0)
- tw->tw_wday += 7;
-
- tw->tw_flags &= ~TW_SDAY, tw->tw_flags |= TW_SIMP;
-}
-
-
-/*
- * Copy nmh time structure
- */
-
-void
-twscopy (struct tws *tb, struct tws *tw)
-{
- *tb = *tw; /* struct copy */
-
-#if 0
- tb->tw_sec = tw->tw_sec;
- tb->tw_min = tw->tw_min;
- tb->tw_hour = tw->tw_hour;
- tb->tw_mday = tw->tw_mday;
- tb->tw_mon = tw->tw_mon;
- tb->tw_year = tw->tw_year;
- tb->tw_wday = tw->tw_wday;
- tb->tw_yday = tw->tw_yday;
- tb->tw_zone = tw->tw_zone;
- tb->tw_clock = tw->tw_clock;
- tb->tw_flags = tw->tw_flags;
-#endif
-}
-
-
-/*
- * Compare two nmh time structures
- */
-
-int
-twsort (struct tws *tw1, struct tws *tw2)
-{
- time_t c1, c2;
-
- if (tw1->tw_clock == 0)
- dmktime (tw1);
- if (tw2->tw_clock == 0)
- dmktime (tw2);
-
- return ((c1 = tw1->tw_clock) > (c2 = tw2->tw_clock) ? 1
- : c1 == c2 ? 0 : -1);
-}
projects / mmh / blobdiff