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/*
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* seconds absolute_date ... - convert absolute_date to seconds since epoch
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*/
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#include <u.h>
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#include <libc.h>
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#include <ctype.h>
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typedef ulong Time;
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enum {
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AM, PM, HR24,
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/* token types */
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Month = 1,
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Year,
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Day,
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Timetok,
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Tz,
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Dtz,
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Ignore,
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Ampm,
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Maxtok = 6, /* only this many chars are stored in datetktbl */
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Maxdateflds = 25,
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};
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/*
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* macros for squeezing values into low 7 bits of "value".
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* all timezones we care about are divisible by 10, and the largest value
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* (780) when divided is 78.
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*/
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#define TOVAL(tp, v) ((tp)->value = (v) / 10)
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#define FROMVAL(tp) ((tp)->value * 10) /* uncompress */
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/* keep this struct small since we have an array of them */
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typedef struct {
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char token[Maxtok];
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char type;
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schar value;
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} Datetok;
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int dtok_numparsed;
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/* forwards */
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Datetok *datetoktype(char *s, int *bigvalp);
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static Datetok datetktbl[];
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static unsigned szdatetktbl;
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/* parse 1- or 2-digit number, advance *cpp past it */
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static int
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eatnum(char **cpp)
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{
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int c, x;
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char *cp;
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cp = *cpp;
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c = *cp;
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if (!isascii(c) || !isdigit(c))
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return -1;
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x = c - '0';
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c = *++cp;
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if (isascii(c) && isdigit(c)) {
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x = 10*x + c - '0';
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cp++;
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}
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*cpp = cp;
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return x;
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}
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/* return -1 on failure */
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int
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parsetime(char *time, Tm *tm)
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{
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tm->hour = eatnum(&time);
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if (tm->hour == -1 || *time++ != ':')
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return -1; /* only hour; too short */
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tm->min = eatnum(&time);
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if (tm->min == -1)
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return -1;
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if (*time++ != ':') {
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tm->sec = 0;
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return 0; /* no seconds; okay */
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}
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tm->sec = eatnum(&time);
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if (tm->sec == -1)
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return -1;
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/* this may be considered too strict. garbage at end of time? */
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return *time == '\0' || isascii(*time) && isspace(*time)? 0: -1;
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}
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/*
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* try to parse pre-split timestr in fields as an absolute date
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*/
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int
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tryabsdate(char **fields, int nf, Tm *now, Tm *tm)
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{
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int i, mer = HR24, bigval = -1;
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long flg = 0, ty;
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char *p;
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Datetok *tp;
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now = localtime(time(0)); /* default to local time (zone) */
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tm->tzoff = now->tzoff;
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strncpy(tm->zone, now->zone, sizeof tm->zone - 1);
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tm->zone[sizeof tm->zone - 1] = '\0';
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tm->mday = tm->mon = tm->year = -1; /* mandatory */
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tm->hour = tm->min = tm->sec = 0;
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dtok_numparsed = 0;
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for (i = 0; i < nf; i++) {
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if (fields[i][0] == '\0')
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continue;
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tp = datetoktype(fields[i], &bigval);
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ty = (1L << tp->type) & ~(1L << Ignore);
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if (flg & ty)
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return -1; /* repeated type */
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flg |= ty;
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switch (tp->type) {
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case Year:
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tm->year = bigval;
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if (tm->year < 1970 || tm->year > 2106)
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return -1; /* can't represent in ulong */
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/* convert 4-digit year to 1900 origin */
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if (tm->year >= 1900)
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tm->year -= 1900;
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break;
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case Day:
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tm->mday = bigval;
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break;
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case Month:
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tm->mon = tp->value - 1; /* convert to zero-origin */
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break;
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case Timetok:
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if (parsetime(fields[i], tm) < 0)
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return -1;
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break;
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case Dtz:
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case Tz:
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tm->tzoff = FROMVAL(tp);
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/* tm2sec needs the name in upper case */
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strncpy(tm->zone, fields[i], sizeof tm->zone - 1);
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tm->zone[sizeof tm->zone - 1] = '\0';
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for (p = tm->zone; *p; p++)
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if (isascii(*p) && islower(*p))
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*p = toupper(*p);
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break;
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case Ignore:
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break;
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case Ampm:
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mer = tp->value;
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break;
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default:
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return -1; /* bad token type: CANTHAPPEN */
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}
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}
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if (tm->year == -1 || tm->mon == -1 || tm->mday == -1)
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return -1; /* missing component */
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if (mer == PM)
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tm->hour += 12;
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return 0;
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}
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int
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prsabsdate(char *timestr, Tm *now, Tm *tm)
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{
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int nf;
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char *fields[Maxdateflds];
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static char delims[] = "- \t\n/,";
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nf = gettokens(timestr, fields, nelem(fields), delims+1);
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if (nf > nelem(fields))
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return -1;
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if (tryabsdate(fields, nf, now, tm) < 0) {
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char *p = timestr;
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/*
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* could be a DEC-date; glue it all back together, split it
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* with dash as a delimiter and try again. Yes, this is a
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* hack, but so are DEC-dates.
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*/
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while (--nf > 0) {
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while (*p++ != '\0')
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;
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p[-1] = ' ';
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}
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nf = gettokens(timestr, fields, nelem(fields), delims);
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if (nf > nelem(fields) || tryabsdate(fields, nf, now, tm) < 0)
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return -1;
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}
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return 0;
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}
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int
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validtm(Tm *tm)
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{
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if (tm->year < 0 || tm->mon < 0 || tm->mon > 11 ||
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tm->mday < 1 || tm->hour < 0 || tm->hour >= 24 ||
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tm->min < 0 || tm->min > 59 ||
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tm->sec < 0 || tm->sec > 61) /* allow 2 leap seconds */
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return 0;
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return 1;
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}
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Time
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seconds(char *timestr)
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{
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Tm date;
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memset(&date, 0, sizeof date);
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if (prsabsdate(timestr, localtime(time(0)), &date) < 0)
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return -1;
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return validtm(&date)? tm2sec(&date): -1;
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}
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int
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convert(char *timestr)
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{
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char *copy;
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Time tstime;
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copy = strdup(timestr);
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if (copy == nil)
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sysfatal("out of memory");
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tstime = seconds(copy);
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free(copy);
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if (tstime == -1) {
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fprint(2, "%s: `%s' not a valid date\n", argv0, timestr);
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return 1;
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}
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print("%lud\n", tstime);
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return 0;
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}
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static void
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usage(void)
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{
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fprint(2, "usage: %s date-time ...\n", argv0);
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exits("usage");
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}
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void
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main(int argc, char **argv)
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{
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int i, sts;
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sts = 0;
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ARGBEGIN{
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default:
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usage();
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}ARGEND
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if (argc == 0)
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usage();
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for (i = 0; i < argc; i++)
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sts |= convert(argv[i]);
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exits(sts != 0? "bad": 0);
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}
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/*
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* Binary search -- from Knuth (6.2.1) Algorithm B. Special case like this
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* is WAY faster than the generic bsearch().
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*/
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Datetok *
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datebsearch(char *key, Datetok *base, unsigned nel)
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{
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int cmp;
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Datetok *last = base + nel - 1, *pos;
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while (last >= base) {
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pos = base + ((last - base) >> 1);
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cmp = key[0] - pos->token[0];
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if (cmp == 0) {
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cmp = strncmp(key, pos->token, Maxtok);
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if (cmp == 0)
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return pos;
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}
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if (cmp < 0)
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last = pos - 1;
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else
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base = pos + 1;
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}
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return 0;
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}
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Datetok *
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datetoktype(char *s, int *bigvalp)
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{
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char *cp = s;
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char c = *cp;
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static Datetok t;
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297 |
Datetok *tp = &t;
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298 |
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if (isascii(c) && isdigit(c)) {
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300 |
int len = strlen(cp);
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301 |
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302 |
if (len > 3 && (cp[1] == ':' || cp[2] == ':'))
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tp->type = Timetok;
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else {
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305 |
if (bigvalp != nil)
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306 |
*bigvalp = atoi(cp); /* won't fit in tp->value */
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307 |
if (len == 4)
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308 |
tp->type = Year;
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309 |
else if (++dtok_numparsed == 1)
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310 |
tp->type = Day;
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311 |
else
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312 |
tp->type = Year;
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313 |
}
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314 |
} else if (c == '-' || c == '+') {
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315 |
int val = atoi(cp + 1);
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int hr = val / 100;
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317 |
int min = val % 100;
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318 |
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319 |
val = hr*60 + min;
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320 |
TOVAL(tp, c == '-'? -val: val);
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321 |
tp->type = Tz;
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322 |
} else {
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323 |
char lowtoken[Maxtok+1];
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324 |
char *ltp = lowtoken, *endltp = lowtoken+Maxtok;
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325 |
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326 |
/* copy to lowtoken to avoid modifying s */
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327 |
while ((c = *cp++) != '\0' && ltp < endltp)
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328 |
*ltp++ = (isascii(c) && isupper(c)? tolower(c): c);
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329 |
*ltp = '\0';
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330 |
tp = datebsearch(lowtoken, datetktbl, szdatetktbl);
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331 |
if (tp == nil) {
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332 |
tp = &t;
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333 |
tp->type = Ignore;
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334 |
}
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335 |
}
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336 |
return tp;
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337 |
}
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338 |
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339 |
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340 |
/*
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341 |
* to keep this table reasonably small, we divide the lexval for Tz and Dtz
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342 |
* entries by 10 and truncate the text field at MAXTOKLEN characters.
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343 |
* the text field is not guaranteed to be NUL-terminated.
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344 |
*/
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345 |
static Datetok datetktbl[] = {
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346 |
/* text token lexval */
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347 |
"acsst", Dtz, 63, /* Cent. Australia */
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348 |
"acst", Tz, 57, /* Cent. Australia */
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349 |
"adt", Dtz, -18, /* Atlantic Daylight Time */
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350 |
"aesst", Dtz, 66, /* E. Australia */
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351 |
"aest", Tz, 60, /* Australia Eastern Std Time */
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352 |
"ahst", Tz, 60, /* Alaska-Hawaii Std Time */
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353 |
"am", Ampm, AM,
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354 |
"apr", Month, 4,
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355 |
"april", Month, 4,
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356 |
"ast", Tz, -24, /* Atlantic Std Time (Canada) */
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357 |
"at", Ignore, 0, /* "at" (throwaway) */
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358 |
"aug", Month, 8,
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359 |
"august", Month, 8,
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360 |
"awsst", Dtz, 54, /* W. Australia */
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361 |
"awst", Tz, 48, /* W. Australia */
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362 |
"bst", Tz, 6, /* British Summer Time */
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363 |
"bt", Tz, 18, /* Baghdad Time */
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364 |
"cadt", Dtz, 63, /* Central Australian DST */
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365 |
"cast", Tz, 57, /* Central Australian ST */
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366 |
"cat", Tz, -60, /* Central Alaska Time */
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367 |
"cct", Tz, 48, /* China Coast */
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368 |
"cdt", Dtz, -30, /* Central Daylight Time */
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369 |
"cet", Tz, 6, /* Central European Time */
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370 |
"cetdst", Dtz, 12, /* Central European Dayl.Time */
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371 |
"cst", Tz, -36, /* Central Standard Time */
|
|
|
372 |
"dec", Month, 12,
|
|
|
373 |
"decemb", Month, 12,
|
|
|
374 |
"dnt", Tz, 6, /* Dansk Normal Tid */
|
|
|
375 |
"dst", Ignore, 0,
|
|
|
376 |
"east", Tz, -60, /* East Australian Std Time */
|
|
|
377 |
"edt", Dtz, -24, /* Eastern Daylight Time */
|
|
|
378 |
"eet", Tz, 12, /* East. Europe, USSR Zone 1 */
|
|
|
379 |
"eetdst", Dtz, 18, /* Eastern Europe */
|
|
|
380 |
"est", Tz, -30, /* Eastern Standard Time */
|
|
|
381 |
"feb", Month, 2,
|
|
|
382 |
"februa", Month, 2,
|
|
|
383 |
"fri", Ignore, 5,
|
|
|
384 |
"friday", Ignore, 5,
|
|
|
385 |
"fst", Tz, 6, /* French Summer Time */
|
|
|
386 |
"fwt", Dtz, 12, /* French Winter Time */
|
|
|
387 |
"gmt", Tz, 0, /* Greenwish Mean Time */
|
|
|
388 |
"gst", Tz, 60, /* Guam Std Time, USSR Zone 9 */
|
|
|
389 |
"hdt", Dtz, -54, /* Hawaii/Alaska */
|
|
|
390 |
"hmt", Dtz, 18, /* Hellas ? ? */
|
|
|
391 |
"hst", Tz, -60, /* Hawaii Std Time */
|
|
|
392 |
"idle", Tz, 72, /* Intl. Date Line, East */
|
|
|
393 |
"idlw", Tz, -72, /* Intl. Date Line, West */
|
|
|
394 |
"ist", Tz, 12, /* Israel */
|
|
|
395 |
"it", Tz, 22, /* Iran Time */
|
|
|
396 |
"jan", Month, 1,
|
|
|
397 |
"januar", Month, 1,
|
|
|
398 |
"jst", Tz, 54, /* Japan Std Time,USSR Zone 8 */
|
|
|
399 |
"jt", Tz, 45, /* Java Time */
|
|
|
400 |
"jul", Month, 7,
|
|
|
401 |
"july", Month, 7,
|
|
|
402 |
"jun", Month, 6,
|
|
|
403 |
"june", Month, 6,
|
|
|
404 |
"kst", Tz, 54, /* Korea Standard Time */
|
|
|
405 |
"ligt", Tz, 60, /* From Melbourne, Australia */
|
|
|
406 |
"mar", Month, 3,
|
|
|
407 |
"march", Month, 3,
|
|
|
408 |
"may", Month, 5,
|
|
|
409 |
"mdt", Dtz, -36, /* Mountain Daylight Time */
|
|
|
410 |
"mest", Dtz, 12, /* Middle Europe Summer Time */
|
|
|
411 |
"met", Tz, 6, /* Middle Europe Time */
|
|
|
412 |
"metdst", Dtz, 12, /* Middle Europe Daylight Time*/
|
|
|
413 |
"mewt", Tz, 6, /* Middle Europe Winter Time */
|
|
|
414 |
"mez", Tz, 6, /* Middle Europe Zone */
|
|
|
415 |
"mon", Ignore, 1,
|
|
|
416 |
"monday", Ignore, 1,
|
|
|
417 |
"mst", Tz, -42, /* Mountain Standard Time */
|
|
|
418 |
"mt", Tz, 51, /* Moluccas Time */
|
|
|
419 |
"ndt", Dtz, -15, /* Nfld. Daylight Time */
|
|
|
420 |
"nft", Tz, -21, /* Newfoundland Standard Time */
|
|
|
421 |
"nor", Tz, 6, /* Norway Standard Time */
|
|
|
422 |
"nov", Month, 11,
|
|
|
423 |
"novemb", Month, 11,
|
|
|
424 |
"nst", Tz, -21, /* Nfld. Standard Time */
|
|
|
425 |
"nt", Tz, -66, /* Nome Time */
|
|
|
426 |
"nzdt", Dtz, 78, /* New Zealand Daylight Time */
|
|
|
427 |
"nzst", Tz, 72, /* New Zealand Standard Time */
|
|
|
428 |
"nzt", Tz, 72, /* New Zealand Time */
|
|
|
429 |
"oct", Month, 10,
|
|
|
430 |
"octobe", Month, 10,
|
|
|
431 |
"on", Ignore, 0, /* "on" (throwaway) */
|
|
|
432 |
"pdt", Dtz, -42, /* Pacific Daylight Time */
|
|
|
433 |
"pm", Ampm, PM,
|
|
|
434 |
"pst", Tz, -48, /* Pacific Standard Time */
|
|
|
435 |
"sadt", Dtz, 63, /* S. Australian Dayl. Time */
|
|
|
436 |
"sast", Tz, 57, /* South Australian Std Time */
|
|
|
437 |
"sat", Ignore, 6,
|
|
|
438 |
"saturd", Ignore, 6,
|
|
|
439 |
"sep", Month, 9,
|
|
|
440 |
"sept", Month, 9,
|
|
|
441 |
"septem", Month, 9,
|
|
|
442 |
"set", Tz, -6, /* Seychelles Time ?? */
|
|
|
443 |
"sst", Dtz, 12, /* Swedish Summer Time */
|
|
|
444 |
"sun", Ignore, 0,
|
|
|
445 |
"sunday", Ignore, 0,
|
|
|
446 |
"swt", Tz, 6, /* Swedish Winter Time */
|
|
|
447 |
"thu", Ignore, 4,
|
|
|
448 |
"thur", Ignore, 4,
|
|
|
449 |
"thurs", Ignore, 4,
|
|
|
450 |
"thursd", Ignore, 4,
|
|
|
451 |
"tue", Ignore, 2,
|
|
|
452 |
"tues", Ignore, 2,
|
|
|
453 |
"tuesda", Ignore, 2,
|
|
|
454 |
"ut", Tz, 0,
|
|
|
455 |
"utc", Tz, 0,
|
|
|
456 |
"wadt", Dtz, 48, /* West Australian DST */
|
|
|
457 |
"wast", Tz, 42, /* West Australian Std Time */
|
|
|
458 |
"wat", Tz, -6, /* West Africa Time */
|
|
|
459 |
"wdt", Dtz, 54, /* West Australian DST */
|
|
|
460 |
"wed", Ignore, 3,
|
|
|
461 |
"wednes", Ignore, 3,
|
|
|
462 |
"weds", Ignore, 3,
|
|
|
463 |
"wet", Tz, 0, /* Western Europe */
|
|
|
464 |
"wetdst", Dtz, 6, /* Western Europe */
|
|
|
465 |
"wst", Tz, 48, /* West Australian Std Time */
|
|
|
466 |
"ydt", Dtz, -48, /* Yukon Daylight Time */
|
|
|
467 |
"yst", Tz, -54, /* Yukon Standard Time */
|
|
|
468 |
"zp4", Tz, -24, /* GMT +4 hours. */
|
|
|
469 |
"zp5", Tz, -30, /* GMT +5 hours. */
|
|
|
470 |
"zp6", Tz, -36, /* GMT +6 hours. */
|
|
|
471 |
};
|
|
|
472 |
static unsigned szdatetktbl = nelem(datetktbl);
|