#ifdef __FreeBSD__
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#endif
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
time_t get_date(time_t now, char *);
#define EPOCH 1970
#define MINUTE (60L)
#define HOUR (60L * MINUTE)
#define DAY (24L * HOUR)
enum DSTMODE { DSTon, DSToff, DSTmaybe };
enum { tAM, tPM };
enum { tAGO = 260, tDAY, tDAYZONE, tAMPM, tMONTH, tMONTH_UNIT, tSEC_UNIT,
tUNUMBER, tZONE, tDST };
struct token { int token; time_t value; };
struct gdstate {
struct token *tokenp;
int HaveYear;
int HaveMonth;
int HaveDay;
int HaveWeekDay;
int HaveTime;
int HaveZone;
int HaveRel;
time_t Timezone;
time_t Day;
time_t Hour;
time_t Minutes;
time_t Month;
time_t Seconds;
time_t Year;
enum DSTMODE DSTmode;
time_t DayOrdinal;
time_t DayNumber;
time_t RelMonth;
time_t RelSeconds;
};
static int
timephrase(struct gdstate *gds)
{
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == ':'
&& gds->tokenp[2].token == tUNUMBER
&& gds->tokenp[3].token == ':'
&& gds->tokenp[4].token == tUNUMBER) {
++gds->HaveTime;
gds->Hour = gds->tokenp[0].value;
gds->Minutes = gds->tokenp[2].value;
gds->Seconds = gds->tokenp[4].value;
gds->tokenp += 5;
}
else if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == ':'
&& gds->tokenp[2].token == tUNUMBER) {
++gds->HaveTime;
gds->Hour = gds->tokenp[0].value;
gds->Minutes = gds->tokenp[2].value;
gds->Seconds = 0;
gds->tokenp += 3;
}
else if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == tAMPM) {
++gds->HaveTime;
gds->Hour = gds->tokenp[0].value;
gds->Minutes = gds->Seconds = 0;
gds->tokenp += 1;
} else {
return 0;
}
if (gds->tokenp[0].token == tAMPM) {
if (gds->Hour == 12)
gds->Hour = 0;
if (gds->tokenp[0].value == tPM)
gds->Hour += 12;
gds->tokenp += 1;
}
if (gds->tokenp[0].token == '+'
&& gds->tokenp[1].token == tUNUMBER) {
gds->HaveZone++;
gds->DSTmode = DSToff;
gds->Timezone = - ((gds->tokenp[1].value / 100) * HOUR
+ (gds->tokenp[1].value % 100) * MINUTE);
gds->tokenp += 2;
}
if (gds->tokenp[0].token == '-'
&& gds->tokenp[1].token == tUNUMBER) {
gds->HaveZone++;
gds->DSTmode = DSToff;
gds->Timezone = + ((gds->tokenp[1].value / 100) * HOUR
+ (gds->tokenp[1].value % 100) * MINUTE);
gds->tokenp += 2;
}
return 1;
}
static int
zonephrase(struct gdstate *gds)
{
if (gds->tokenp[0].token == tZONE
&& gds->tokenp[1].token == tDST) {
gds->HaveZone++;
gds->Timezone = gds->tokenp[0].value;
gds->DSTmode = DSTon;
gds->tokenp += 1;
return 1;
}
if (gds->tokenp[0].token == tZONE) {
gds->HaveZone++;
gds->Timezone = gds->tokenp[0].value;
gds->DSTmode = DSToff;
gds->tokenp += 1;
return 1;
}
if (gds->tokenp[0].token == tDAYZONE) {
gds->HaveZone++;
gds->Timezone = gds->tokenp[0].value;
gds->DSTmode = DSTon;
gds->tokenp += 1;
return 1;
}
return 0;
}
static int
datephrase(struct gdstate *gds)
{
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == '/'
&& gds->tokenp[2].token == tUNUMBER
&& gds->tokenp[3].token == '/'
&& gds->tokenp[4].token == tUNUMBER) {
gds->HaveYear++;
gds->HaveMonth++;
gds->HaveDay++;
if (gds->tokenp[0].value >= 13) {
gds->Year = gds->tokenp[0].value;
gds->Month = gds->tokenp[2].value;
gds->Day = gds->tokenp[4].value;
} else if ((gds->tokenp[4].value >= 13)
|| (gds->tokenp[2].value >= 13)) {
gds->Month = gds->tokenp[0].value;
gds->Day = gds->tokenp[2].value;
gds->Year = gds->tokenp[4].value;
} else {
gds->Month = gds->tokenp[0].value;
gds->Day = gds->tokenp[2].value;
gds->Year = gds->tokenp[4].value;
}
gds->tokenp += 5;
return 1;
}
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == '/'
&& gds->tokenp[2].token == tUNUMBER) {
gds->HaveMonth++;
gds->HaveDay++;
gds->Month = gds->tokenp[0].value;
gds->Day = gds->tokenp[2].value;
gds->tokenp += 3;
return 1;
}
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == '-'
&& gds->tokenp[2].token == tUNUMBER
&& gds->tokenp[3].token == '-'
&& gds->tokenp[4].token == tUNUMBER) {
gds->HaveYear++;
gds->HaveMonth++;
gds->HaveDay++;
gds->Year = gds->tokenp[0].value;
gds->Month = gds->tokenp[2].value;
gds->Day = gds->tokenp[4].value;
gds->tokenp += 5;
return 1;
}
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == '-'
&& gds->tokenp[2].token == tMONTH
&& gds->tokenp[3].token == '-'
&& gds->tokenp[4].token == tUNUMBER) {
gds->HaveYear++;
gds->HaveMonth++;
gds->HaveDay++;
if (gds->tokenp[0].value > 31) {
gds->Year = gds->tokenp[0].value;
gds->Month = gds->tokenp[2].value;
gds->Day = gds->tokenp[4].value;
} else {
gds->Day = gds->tokenp[0].value;
gds->Month = gds->tokenp[2].value;
gds->Year = gds->tokenp[4].value;
}
gds->tokenp += 5;
return 1;
}
if (gds->tokenp[0].token == tMONTH
&& gds->tokenp[1].token == tUNUMBER
&& gds->tokenp[2].token == ','
&& gds->tokenp[3].token == tUNUMBER) {
gds->HaveYear++;
gds->HaveMonth++;
gds->HaveDay++;
gds->Month = gds->tokenp[0].value;
gds->Day = gds->tokenp[1].value;
gds->Year = gds->tokenp[3].value;
gds->tokenp += 4;
return 1;
}
if (gds->tokenp[0].token == tMONTH
&& gds->tokenp[1].token == tUNUMBER) {
gds->HaveMonth++;
gds->HaveDay++;
gds->Month = gds->tokenp[0].value;
gds->Day = gds->tokenp[1].value;
gds->tokenp += 2;
return 1;
}
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == tMONTH
&& gds->tokenp[2].token == tUNUMBER) {
gds->HaveYear++;
gds->HaveMonth++;
gds->HaveDay++;
gds->Day = gds->tokenp[0].value;
gds->Month = gds->tokenp[1].value;
gds->Year = gds->tokenp[2].value;
gds->tokenp += 3;
return 1;
}
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == tMONTH) {
gds->HaveMonth++;
gds->HaveDay++;
gds->Day = gds->tokenp[0].value;
gds->Month = gds->tokenp[1].value;
gds->tokenp += 2;
return 1;
}
return 0;
}
static int
relunitphrase(struct gdstate *gds)
{
if (gds->tokenp[0].token == '-'
&& gds->tokenp[1].token == tUNUMBER
&& gds->tokenp[2].token == tSEC_UNIT) {
gds->HaveRel++;
gds->RelSeconds -= gds->tokenp[1].value * gds->tokenp[2].value;
gds->tokenp += 3;
return 1;
}
if (gds->tokenp[0].token == '+'
&& gds->tokenp[1].token == tUNUMBER
&& gds->tokenp[2].token == tSEC_UNIT) {
gds->HaveRel++;
gds->RelSeconds += gds->tokenp[1].value * gds->tokenp[2].value;
gds->tokenp += 3;
return 1;
}
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == tSEC_UNIT) {
gds->HaveRel++;
gds->RelSeconds += gds->tokenp[1].value * gds->tokenp[2].value;
gds->tokenp += 3;
return 1;
}
if (gds->tokenp[0].token == '-'
&& gds->tokenp[1].token == tUNUMBER
&& gds->tokenp[2].token == tMONTH_UNIT) {
gds->HaveRel++;
gds->RelMonth -= gds->tokenp[1].value * gds->tokenp[2].value;
gds->tokenp += 3;
return 1;
}
if (gds->tokenp[0].token == '+'
&& gds->tokenp[1].token == tUNUMBER
&& gds->tokenp[2].token == tMONTH_UNIT) {
gds->HaveRel++;
gds->RelMonth += gds->tokenp[1].value * gds->tokenp[2].value;
gds->tokenp += 3;
return 1;
}
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == tMONTH_UNIT) {
gds->HaveRel++;
gds->RelMonth += gds->tokenp[0].value * gds->tokenp[1].value;
gds->tokenp += 2;
return 1;
}
if (gds->tokenp[0].token == tSEC_UNIT) {
gds->HaveRel++;
gds->RelSeconds += gds->tokenp[0].value;
++gds->tokenp;
return 1;
}
if (gds->tokenp[0].token == tMONTH_UNIT) {
gds->HaveRel++;
gds->RelMonth += gds->tokenp[0].value;
gds->tokenp += 1;
return 1;
}
return 0;
}
static int
dayphrase(struct gdstate *gds)
{
if (gds->tokenp[0].token == tDAY) {
gds->HaveWeekDay++;
gds->DayOrdinal = 1;
gds->DayNumber = gds->tokenp[0].value;
gds->tokenp += 1;
if (gds->tokenp[0].token == ',')
gds->tokenp += 1;
return 1;
}
if (gds->tokenp[0].token == tUNUMBER
&& gds->tokenp[1].token == tDAY) {
gds->HaveWeekDay++;
gds->DayOrdinal = gds->tokenp[0].value;
gds->DayNumber = gds->tokenp[1].value;
gds->tokenp += 2;
return 1;
}
return 0;
}
static int
phrase(struct gdstate *gds)
{
if (timephrase(gds))
return 1;
if (zonephrase(gds))
return 1;
if (datephrase(gds))
return 1;
if (dayphrase(gds))
return 1;
if (relunitphrase(gds)) {
if (gds->tokenp[0].token == tAGO) {
gds->RelSeconds = -gds->RelSeconds;
gds->RelMonth = -gds->RelMonth;
gds->tokenp += 1;
}
return 1;
}
if (gds->tokenp[0].token == tUNUMBER) {
if (gds->HaveTime && !gds->HaveYear && !gds->HaveRel) {
gds->HaveYear++;
gds->Year = gds->tokenp[0].value;
gds->tokenp += 1;
return 1;
}
if(gds->tokenp[0].value > 10000) {
gds->HaveYear++;
gds->HaveMonth++;
gds->HaveDay++;
gds->Day= (gds->tokenp[0].value)%100;
gds->Month= (gds->tokenp[0].value/100)%100;
gds->Year = gds->tokenp[0].value/10000;
gds->tokenp += 1;
return 1;
}
if (gds->tokenp[0].value < 24) {
gds->HaveTime++;
gds->Hour = gds->tokenp[0].value;
gds->Minutes = 0;
gds->Seconds = 0;
gds->tokenp += 1;
return 1;
}
if ((gds->tokenp[0].value / 100 < 24)
&& (gds->tokenp[0].value % 100 < 60)) {
gds->Hour = gds->tokenp[0].value / 100;
gds->Minutes = gds->tokenp[0].value % 100;
gds->Seconds = 0;
gds->tokenp += 1;
return 1;
}
}
return 0;
}
static struct LEXICON {
size_t abbrev;
const char *name;
int type;
time_t value;
} const TimeWords[] = {
{ 0, "am", tAMPM, tAM },
{ 0, "pm", tAMPM, tPM },
{ 3, "january", tMONTH, 1 },
{ 3, "february", tMONTH, 2 },
{ 3, "march", tMONTH, 3 },
{ 3, "april", tMONTH, 4 },
{ 3, "may", tMONTH, 5 },
{ 3, "june", tMONTH, 6 },
{ 3, "july", tMONTH, 7 },
{ 3, "august", tMONTH, 8 },
{ 3, "september", tMONTH, 9 },
{ 3, "october", tMONTH, 10 },
{ 3, "november", tMONTH, 11 },
{ 3, "december", tMONTH, 12 },
{ 2, "sunday", tDAY, 0 },
{ 3, "monday", tDAY, 1 },
{ 2, "tuesday", tDAY, 2 },
{ 3, "wednesday", tDAY, 3 },
{ 2, "thursday", tDAY, 4 },
{ 2, "friday", tDAY, 5 },
{ 2, "saturday", tDAY, 6 },
{ 0, "gmt", tZONE, 0*HOUR },
{ 0, "ut", tZONE, 0*HOUR },
{ 0, "utc", tZONE, 0*HOUR },
{ 0, "wet", tZONE, 0*HOUR },
{ 0, "bst", tDAYZONE, 0*HOUR },
{ 0, "wat", tZONE, 1*HOUR },
{ 0, "at", tZONE, 2*HOUR },
{ 0, "nft", tZONE, 3*HOUR+30*MINUTE },
{ 0, "nst", tZONE, 3*HOUR+30*MINUTE },
{ 0, "ndt", tDAYZONE, 3*HOUR+30*MINUTE },
{ 0, "ast", tZONE, 4*HOUR },
{ 0, "adt", tDAYZONE, 4*HOUR },
{ 0, "est", tZONE, 5*HOUR },
{ 0, "edt", tDAYZONE, 5*HOUR },
{ 0, "cst", tZONE, 6*HOUR },
{ 0, "cdt", tDAYZONE, 6*HOUR },
{ 0, "mst", tZONE, 7*HOUR },
{ 0, "mdt", tDAYZONE, 7*HOUR },
{ 0, "pst", tZONE, 8*HOUR },
{ 0, "pdt", tDAYZONE, 8*HOUR },
{ 0, "yst", tZONE, 9*HOUR },
{ 0, "ydt", tDAYZONE, 9*HOUR },
{ 0, "hst", tZONE, 10*HOUR },
{ 0, "hdt", tDAYZONE, 10*HOUR },
{ 0, "cat", tZONE, 10*HOUR },
{ 0, "ahst", tZONE, 10*HOUR },
{ 0, "nt", tZONE, 11*HOUR },
{ 0, "idlw", tZONE, 12*HOUR },
{ 0, "cet", tZONE, -1*HOUR },
{ 0, "met", tZONE, -1*HOUR },
{ 0, "mewt", tZONE, -1*HOUR },
{ 0, "mest", tDAYZONE, -1*HOUR },
{ 0, "swt", tZONE, -1*HOUR },
{ 0, "sst", tDAYZONE, -1*HOUR },
{ 0, "fwt", tZONE, -1*HOUR },
{ 0, "fst", tDAYZONE, -1*HOUR },
{ 0, "eet", tZONE, -2*HOUR },
{ 0, "bt", tZONE, -3*HOUR },
{ 0, "it", tZONE, -3*HOUR-30*MINUTE },
{ 0, "zp4", tZONE, -4*HOUR },
{ 0, "zp5", tZONE, -5*HOUR },
{ 0, "ist", tZONE, -5*HOUR-30*MINUTE },
{ 0, "zp6", tZONE, -6*HOUR },
{ 0, "wast", tZONE, -7*HOUR },
{ 0, "wadt", tDAYZONE, -7*HOUR },
{ 0, "jt", tZONE, -7*HOUR-30*MINUTE },
{ 0, "cct", tZONE, -8*HOUR },
{ 0, "jst", tZONE, -9*HOUR },
{ 0, "cast", tZONE, -9*HOUR-30*MINUTE },
{ 0, "cadt", tDAYZONE, -9*HOUR-30*MINUTE },
{ 0, "east", tZONE, -10*HOUR },
{ 0, "eadt", tDAYZONE, -10*HOUR },
{ 0, "gst", tZONE, -10*HOUR },
{ 0, "nzt", tZONE, -12*HOUR },
{ 0, "nzst", tZONE, -12*HOUR },
{ 0, "nzdt", tDAYZONE, -12*HOUR },
{ 0, "idle", tZONE, -12*HOUR },
{ 0, "dst", tDST, 0 },
{ 4, "years", tMONTH_UNIT, 12 },
{ 5, "months", tMONTH_UNIT, 1 },
{ 9, "fortnights", tSEC_UNIT, 14 * DAY },
{ 4, "weeks", tSEC_UNIT, 7 * DAY },
{ 3, "days", tSEC_UNIT, DAY },
{ 4, "hours", tSEC_UNIT, HOUR },
{ 3, "minutes", tSEC_UNIT, MINUTE },
{ 3, "seconds", tSEC_UNIT, 1 },
{ 0, "tomorrow", tSEC_UNIT, DAY },
{ 0, "yesterday", tSEC_UNIT, -DAY },
{ 0, "today", tSEC_UNIT, 0 },
{ 0, "now", tSEC_UNIT, 0 },
{ 0, "last", tUNUMBER, -1 },
{ 0, "this", tSEC_UNIT, 0 },
{ 0, "next", tUNUMBER, 2 },
{ 0, "first", tUNUMBER, 1 },
{ 0, "1st", tUNUMBER, 1 },
{ 0, "2nd", tUNUMBER, 2 },
{ 0, "third", tUNUMBER, 3 },
{ 0, "3rd", tUNUMBER, 3 },
{ 0, "fourth", tUNUMBER, 4 },
{ 0, "4th", tUNUMBER, 4 },
{ 0, "fifth", tUNUMBER, 5 },
{ 0, "5th", tUNUMBER, 5 },
{ 0, "sixth", tUNUMBER, 6 },
{ 0, "seventh", tUNUMBER, 7 },
{ 0, "eighth", tUNUMBER, 8 },
{ 0, "ninth", tUNUMBER, 9 },
{ 0, "tenth", tUNUMBER, 10 },
{ 0, "eleventh", tUNUMBER, 11 },
{ 0, "twelfth", tUNUMBER, 12 },
{ 0, "ago", tAGO, 1 },
{ 0, "a", tZONE, 1*HOUR },
{ 0, "b", tZONE, 2*HOUR },
{ 0, "c", tZONE, 3*HOUR },
{ 0, "d", tZONE, 4*HOUR },
{ 0, "e", tZONE, 5*HOUR },
{ 0, "f", tZONE, 6*HOUR },
{ 0, "g", tZONE, 7*HOUR },
{ 0, "h", tZONE, 8*HOUR },
{ 0, "i", tZONE, 9*HOUR },
{ 0, "k", tZONE, 10*HOUR },
{ 0, "l", tZONE, 11*HOUR },
{ 0, "m", tZONE, 12*HOUR },
{ 0, "n", tZONE, -1*HOUR },
{ 0, "o", tZONE, -2*HOUR },
{ 0, "p", tZONE, -3*HOUR },
{ 0, "q", tZONE, -4*HOUR },
{ 0, "r", tZONE, -5*HOUR },
{ 0, "s", tZONE, -6*HOUR },
{ 0, "t", tZONE, -7*HOUR },
{ 0, "u", tZONE, -8*HOUR },
{ 0, "v", tZONE, -9*HOUR },
{ 0, "w", tZONE, -10*HOUR },
{ 0, "x", tZONE, -11*HOUR },
{ 0, "y", tZONE, -12*HOUR },
{ 0, "z", tZONE, 0*HOUR },
{ 0, NULL, 0, 0 }
};
static time_t
Convert(time_t Month, time_t Day, time_t Year,
time_t Hours, time_t Minutes, time_t Seconds,
time_t Timezone, enum DSTMODE DSTmode)
{
static int DaysInMonth[12] = {
31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
};
time_t Julian;
int i;
if (Year < 69)
Year += 2000;
else if (Year < 100)
Year += 1900;
DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0)
? 29 : 28;
if (Year < EPOCH || Year > 2038
|| Month < 1 || Month > 12
|| Day < 1 || Day > DaysInMonth[(int)--Month]
|| Hours < 0 || Hours > 23
|| Minutes < 0 || Minutes > 59
|| Seconds < 0 || Seconds > 59)
return -1;
Julian = Day - 1;
for (i = 0; i < Month; i++)
Julian += DaysInMonth[i];
for (i = EPOCH; i < Year; i++)
Julian += 365 + (i % 4 == 0);
Julian *= DAY;
Julian += Timezone;
Julian += Hours * HOUR + Minutes * MINUTE + Seconds;
if (DSTmode == DSTon
|| (DSTmode == DSTmaybe && localtime(&Julian)->tm_isdst))
Julian -= HOUR;
return Julian;
}
static time_t
DSTcorrect(time_t Start, time_t Future)
{
time_t StartDay;
time_t FutureDay;
StartDay = (localtime(&Start)->tm_hour + 1) % 24;
FutureDay = (localtime(&Future)->tm_hour + 1) % 24;
return (Future - Start) + (StartDay - FutureDay) * HOUR;
}
static time_t
RelativeDate(time_t Start, time_t zone, int dstmode,
time_t DayOrdinal, time_t DayNumber)
{
struct tm *tm;
time_t t, now;
t = Start - zone;
tm = gmtime(&t);
now = Start;
now += DAY * ((DayNumber - tm->tm_wday + 7) % 7);
now += 7 * DAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1);
if (dstmode == DSTmaybe)
return DSTcorrect(Start, now);
return now - Start;
}
static time_t
RelativeMonth(time_t Start, time_t Timezone, time_t RelMonth)
{
struct tm *tm;
time_t Month;
time_t Year;
if (RelMonth == 0)
return 0;
tm = localtime(&Start);
Month = 12 * (tm->tm_year + 1900) + tm->tm_mon + RelMonth;
Year = Month / 12;
Month = Month % 12 + 1;
return DSTcorrect(Start,
Convert(Month, (time_t)tm->tm_mday, Year,
(time_t)tm->tm_hour, (time_t)tm->tm_min, (time_t)tm->tm_sec,
Timezone, DSTmaybe));
}
static int
nexttoken(char **in, time_t *value)
{
char c;
char buff[64];
for ( ; ; ) {
while (isspace((unsigned char)**in))
++*in;
if (**in == '(') {
int Count = 0;
do {
c = *(*in)++;
if (c == '\0')
return c;
if (c == '(')
Count++;
else if (c == ')')
Count--;
} while (Count > 0);
continue;
}
{
char *src = *in;
const struct LEXICON *tp;
unsigned i = 0;
while (*src != '\0'
&& (isalnum((unsigned char)*src) || *src == '.')
&& i < sizeof(buff)-1) {
if (*src != '.') {
if (isupper((unsigned char)*src))
buff[i++] = tolower((unsigned char)*src);
else
buff[i++] = *src;
}
src++;
}
buff[i] = '\0';
for (tp = TimeWords; tp->name; tp++) {
size_t abbrev = tp->abbrev;
if (abbrev == 0)
abbrev = strlen(tp->name);
if (strlen(buff) >= abbrev
&& strncmp(tp->name, buff, strlen(buff))
== 0) {
*in = src;
*value = tp->value;
return tp->type;
}
}
}
if (isdigit((unsigned char)(c = **in))) {
for (*value = 0; isdigit((unsigned char)(c = *(*in)++)); )
*value = 10 * *value + c - '0';
(*in)--;
return (tUNUMBER);
}
return *(*in)++;
}
}
#define TM_YEAR_ORIGIN 1900
static long
difftm (struct tm *a, struct tm *b)
{
int ay = a->tm_year + (TM_YEAR_ORIGIN - 1);
int by = b->tm_year + (TM_YEAR_ORIGIN - 1);
int days = (
a->tm_yday - b->tm_yday
+ ((ay >> 2) - (by >> 2))
- (ay/100 - by/100)
+ ((ay/100 >> 2) - (by/100 >> 2))
+ (long)(ay-by) * 365
);
return (days * DAY + (a->tm_hour - b->tm_hour) * HOUR
+ (a->tm_min - b->tm_min) * MINUTE
+ (a->tm_sec - b->tm_sec));
}
time_t
get_date(time_t now, char *p)
{
struct token tokens[256];
struct gdstate _gds;
struct token *lasttoken;
struct gdstate *gds;
struct tm local, *tm;
struct tm gmt, *gmt_ptr;
time_t Start;
time_t tod;
long tzone;
memset(tokens, 0, sizeof(tokens));
memset(&_gds, 0, sizeof(_gds));
gds = &_gds;
memset(&local, 0, sizeof(local));
tm = localtime (&now);
if (tm == NULL)
return -1;
local = *tm;
memset(&gmt, 0, sizeof(gmt));
gmt_ptr = gmtime (&now);
if (gmt_ptr != NULL) {
gmt = *gmt_ptr;
}
if (gmt_ptr != NULL)
tzone = difftm (&gmt, &local);
else
tzone = 0;
if(local.tm_isdst)
tzone += HOUR;
lasttoken = tokens;
while ((lasttoken->token = nexttoken(&p, &lasttoken->value)) != 0) {
++lasttoken;
if (lasttoken > tokens + 255)
return -1;
}
gds->tokenp = tokens;
while (gds->tokenp < lasttoken) {
if (!phrase(gds))
return -1;
}
if (!gds->HaveZone) {
gds->Timezone = tzone;
gds->DSTmode = DSTmaybe;
}
if (gds->HaveZone && gmt_ptr != NULL) {
now -= gds->Timezone;
gmt_ptr = gmtime (&now);
if (gmt_ptr != NULL)
local = *gmt_ptr;
now += gds->Timezone;
}
if (!gds->HaveYear)
gds->Year = local.tm_year + 1900;
if (!gds->HaveMonth)
gds->Month = local.tm_mon + 1;
if (!gds->HaveDay)
gds->Day = local.tm_mday;
if (gds->HaveTime > 1 || gds->HaveZone > 1 || gds->HaveWeekDay > 1
|| gds->HaveYear > 1 || gds->HaveMonth > 1 || gds->HaveDay > 1)
return -1;
if (gds->HaveYear || gds->HaveMonth || gds->HaveDay
|| gds->HaveTime || gds->HaveWeekDay) {
Start = Convert(gds->Month, gds->Day, gds->Year,
gds->Hour, gds->Minutes, gds->Seconds,
gds->Timezone, gds->DSTmode);
if (Start < 0)
return -1;
} else {
Start = now;
if (!gds->HaveRel)
Start -= local.tm_hour * HOUR + local.tm_min * MINUTE
+ local.tm_sec;
}
Start += gds->RelSeconds;
Start += RelativeMonth(Start, gds->Timezone, gds->RelMonth);
if (gds->HaveWeekDay
&& !(gds->HaveYear || gds->HaveMonth || gds->HaveDay)) {
tod = RelativeDate(Start, gds->Timezone,
gds->DSTmode, gds->DayOrdinal, gds->DayNumber);
Start += tod;
}
return Start == -1 ? 0 : Start;
}
#if defined(TEST)
int
main(int argc, char **argv)
{
time_t d;
while (*++argv != NULL) {
(void)printf("Input: %s\n", *argv);
d = get_date(*argv);
if (d == -1)
(void)printf("Bad format - couldn't convert.\n");
else
(void)printf("Output: %s\n", ctime(&d));
}
exit(0);
}
#endif