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getdate.y
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1980-01-01
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13KB
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544 lines
%token ID MONTH DAY MERIDIAN NUMBER UNIT MUNIT SUNIT ZONE DAYZONE AGO
%{
/* Steven M. Bellovin (unc!smb) */
/* Dept. of Computer Science */
/* University of North Carolina at Chapel Hill */
/* @(#)getdate.y 2.13 9/16/86 */
#include <sys/types.h>
#ifndef AMIGA
# include <sys/timeb.h>
#endif /* AMIGA */
#include <ctype.h>
#include <time.h>
#define NULL 0
#define daysec (24L*60L*60L)
static int timeflag, zoneflag, dateflag, dayflag, relflag;
static time_t relsec, relmonth;
static int hh, mm, ss, merid, daylight;
static int dayord, dayreq;
static int month, day, year;
static int ourzone;
#define AM 1
#define PM 2
#define DAYLIGHT 1
#define STANDARD 2
#define MAYBE 3
%}
%%
timedate: /* empty */
| timedate item;
item: tspec =
{timeflag++;}
| zone =
{zoneflag++;}
| dtspec =
{dateflag++;}
| dyspec =
{dayflag++;}
| rspec =
{relflag++;}
| nspec;
nspec: NUMBER =
{if (timeflag && dateflag && !relflag) year = $1;
else {timeflag++;hh = $1/100;mm = $1%100;ss = 0;merid = 24;}};
tspec: NUMBER MERIDIAN =
{hh = $1; mm = 0; ss = 0; merid = $2;}
| NUMBER ':' NUMBER =
{hh = $1; mm = $3; merid = 24;}
| NUMBER ':' NUMBER MERIDIAN =
{hh = $1; mm = $3; merid = $4;}
| NUMBER ':' NUMBER NUMBER =
{hh = $1; mm = $3; merid = 24;
daylight = STANDARD; ourzone = $4%100 + 60*$4/100;}
| NUMBER ':' NUMBER ':' NUMBER =
{hh = $1; mm = $3; ss = $5; merid = 24;}
| NUMBER ':' NUMBER ':' NUMBER MERIDIAN =
{hh = $1; mm = $3; ss = $5; merid = $6;}
| NUMBER ':' NUMBER ':' NUMBER NUMBER =
{hh = $1; mm = $3; ss = $5; merid = 24;
daylight = STANDARD; ourzone = $6%100 + 60*$6/100;};
zone: ZONE =
{ourzone = $1; daylight = STANDARD;}
| DAYZONE =
{ourzone = $1; daylight = DAYLIGHT;};
dyspec: DAY =
{dayord = 1; dayreq = $1;}
| DAY ',' =
{dayord = 1; dayreq = $1;}
| NUMBER DAY =
{dayord = $1; dayreq = $2;};
dtspec: NUMBER '/' NUMBER =
{month = $1; day = $3;}
| NUMBER '/' NUMBER '/' NUMBER =
{month = $1; day = $3; year = $5;}
| MONTH NUMBER =
{month = $1; day = $2;}
| MONTH NUMBER ',' NUMBER =
{month = $1; day = $2; year = $4;}
| NUMBER MONTH =
{month = $2; day = $1;}
| NUMBER MONTH NUMBER =
{month = $2; day = $1; year = $3;};
rspec: NUMBER UNIT =
{relsec += 60L * $1 * $2;}
| NUMBER MUNIT =
{relmonth += $1 * $2;}
| NUMBER SUNIT =
{relsec += $1;}
| UNIT =
{relsec += 60L * $1;}
| MUNIT =
{relmonth += $1;}
| SUNIT =
{relsec++;}
| rspec AGO =
{relsec = -relsec; relmonth = -relmonth;};
%%
static int mdays[12] =
{31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
#define epoch 1970
extern struct tm *localtime();
time_t dateconv(mm, dd, yy, h, m, s, mer, zone, dayflag)
int mm, dd, yy, h, m, s, mer, zone, dayflag;
{
time_t tod, jdate;
register int i;
time_t timeconv();
if (yy < 0) yy = -yy;
if (yy < 100) yy += 1900;
mdays[1] = 28 + (yy%4 == 0 && (yy%100 != 0 || yy%400 == 0));
if (yy < epoch || yy > 1999 || mm < 1 || mm > 12 ||
dd < 1 || dd > mdays[--mm]) return (-1);
jdate = dd-1;
for (i=0; i<mm; i++) jdate += mdays[i];
for (i = epoch; i < yy; i++) jdate += 365 + (i%4 == 0);
jdate *= daysec;
jdate += zone * 60L;
if ((tod = timeconv(h, m, s, mer)) < 0) return (-1);
jdate += tod;
if (dayflag==DAYLIGHT || (dayflag==MAYBE&&localtime(&jdate)->tm_isdst))
jdate += -1*60*60;
return (jdate);
}
time_t dayconv(ord, day, now) int ord, day; time_t now;
{
register struct tm *loctime;
time_t tod;
time_t daylcorr();
tod = now;
loctime = localtime(&tod);
tod += daysec * ((day - loctime->tm_wday + 7) % 7);
tod += 7*daysec*(ord<=0?ord:ord-1);
return daylcorr(tod, now);
}
time_t timeconv(hh, mm, ss, mer) register int hh, mm, ss, mer;
{
if (mm < 0 || mm > 59 || ss < 0 || ss > 59) return (-1);
switch (mer) {
case AM: if (hh < 1 || hh > 12) return(-1);
return (60L * ((hh%12)*60L + mm)+ss);
case PM: if (hh < 1 || hh > 12) return(-1);
return (60L * ((hh%12 +12)*60L + mm)+ss);
case 24: if (hh < 0 || hh > 23) return (-1);
return (60L * (hh*60L + mm)+ss);
default: return (-1);
}
}
time_t monthadd(sdate, relmonth) time_t sdate, relmonth;
{
struct tm *ltime;
time_t dateconv();
time_t daylcorr();
int mm, yy;
if (relmonth == 0) return 0;
ltime = localtime(&sdate);
mm = 12*ltime->tm_year + ltime->tm_mon + relmonth;
yy = mm/12;
mm = mm%12 + 1;
return daylcorr(dateconv(mm, ltime->tm_mday, yy, ltime->tm_hour,
ltime->tm_min, ltime->tm_sec, 24, ourzone, MAYBE), sdate);
}
time_t daylcorr(future, now) time_t future, now;
{
int fdayl, nowdayl;
nowdayl = (localtime(&now)->tm_hour+1) % 24;
fdayl = (localtime(&future)->tm_hour+1) % 24;
return (future-now) + 60L*60L*(nowdayl-fdayl);
}
static char *lptr;
yylex()
{
extern int yylval;
int sign;
register char c;
register char *p;
char idbuf[20];
int pcnt;
for (;;) {
while (isspace(*lptr)) lptr++;
if (isdigit(c = *lptr) || c == '-' || c == '+') {
if (c== '-' || c == '+') {
if (c=='-') sign = -1;
else sign = 1;
if (!isdigit(*++lptr)) {
/* yylval = sign; return (NUMBER); */
return yylex(); /* skip the '-' sign */
}
} else sign = 1;
yylval = 0;
while (isdigit(c = *lptr++)) yylval = 10*yylval + c - '0';
yylval *= sign;
lptr--;
return (NUMBER);
} else if (isalpha(c)) {
p = idbuf;
while (isalpha(c = *lptr++) || c=='.')
if (p < &idbuf[sizeof(idbuf)-1])
*p++ = c;
*p = '\0';
lptr--;
return (lookup(idbuf));
}
else if (c == '(') {
pcnt = 0;
do {
c = *lptr++;
if (c == '\0') return(c);
else if (c == '(') pcnt++;
else if (c == ')') pcnt--;
} while (pcnt > 0);
}
else return (*lptr++);
}
}
struct table {
char *name;
int type, value;
};
struct table mdtab[] = {
{"January", MONTH, 1},
{"February", MONTH, 2},
{"March", MONTH, 3},
{"April", MONTH, 4},
{"May", MONTH, 5},
{"June", MONTH, 6},
{"July", MONTH, 7},
{"August", MONTH, 8},
{"September", MONTH, 9},
{"Sept", MONTH, 9},
{"October", MONTH, 10},
{"November", MONTH, 11},
{"December", MONTH, 12},
{"Sunday", DAY, 0},
{"Monday", DAY, 1},
{"Tuesday", DAY, 2},
{"Tues", DAY, 2},
{"Wednesday", DAY, 3},
{"Wednes", DAY, 3},
{"Thursday", DAY, 4},
{"Thur", DAY, 4},
{"Thurs", DAY, 4},
{"Friday", DAY, 5},
{"Saturday", DAY, 6},
{0, 0, 0}};
#define HRS *60
#define HALFHR 30
struct table mztab[] = {
{"a.m.", MERIDIAN, AM},
{"am", MERIDIAN, AM},
{"p.m.", MERIDIAN, PM},
{"pm", MERIDIAN, PM},
{"nst", ZONE, 3 HRS + HALFHR}, /* Newfoundland */
{"n.s.t.", ZONE, 3 HRS + HALFHR},
{"ast", ZONE, 4 HRS}, /* Atlantic */
{"a.s.t.", ZONE, 4 HRS},
{"adt", DAYZONE, 4 HRS},
{"a.d.t.", DAYZONE, 4 HRS},
{"est", ZONE, 5 HRS}, /* Eastern */
{"e.s.t.", ZONE, 5 HRS},
{"edt", DAYZONE, 5 HRS},
{"e.d.t.", DAYZONE, 5 HRS},
{"cst", ZONE, 6 HRS}, /* Central */
{"c.s.t.", ZONE, 6 HRS},
{"cdt", DAYZONE, 6 HRS},
{"c.d.t.", DAYZONE, 6 HRS},
{"mst", ZONE, 7 HRS}, /* Mountain */
{"m.s.t.", ZONE, 7 HRS},
{"mdt", DAYZONE, 7 HRS},
{"m.d.t.", DAYZONE, 7 HRS},
{"pst", ZONE, 8 HRS}, /* Pacific */
{"p.s.t.", ZONE, 8 HRS},
{"pdt", DAYZONE, 8 HRS},
{"p.d.t.", DAYZONE, 8 HRS},
{"yst", ZONE, 9 HRS}, /* Yukon */
{"y.s.t.", ZONE, 9 HRS},
{"ydt", DAYZONE, 9 HRS},
{"y.d.t.", DAYZONE, 9 HRS},
{"hst", ZONE, 10 HRS}, /* Hawaii */
{"h.s.t.", ZONE, 10 HRS},
{"hdt", DAYZONE, 10 HRS},
{"h.d.t.", DAYZONE, 10 HRS},
{"gmt", ZONE, 0 HRS},
{"g.m.t.", ZONE, 0 HRS},
{"bst", DAYZONE, 0 HRS}, /* British Summer Time */
{"b.s.t.", DAYZONE, 0 HRS},
{"eet", ZONE, 0 HRS}, /* European Eastern Time */
{"e.e.t.", ZONE, 0 HRS},
{"eest", DAYZONE, 0 HRS}, /* European Eastern Summer Time */
{"e.e.s.t.", DAYZONE, 0 HRS},
{"met", ZONE, -1 HRS}, /* Middle European Time */
{"m.e.t.", ZONE, -1 HRS},
{"mest", DAYZONE, -1 HRS}, /* Middle European Summer Time */
{"m.e.s.t.", DAYZONE, -1 HRS},
{"wet", ZONE, -2 HRS }, /* Western European Time */
{"w.e.t.", ZONE, -2 HRS },
{"west", DAYZONE, -2 HRS}, /* Western European Summer Time */
{"w.e.s.t.", DAYZONE, -2 HRS},
{"jst", ZONE, -9 HRS}, /* Japan Standard Time */
{"j.s.t.", ZONE, -9 HRS}, /* Japan Standard Time */
/* No daylight savings time */
{"aest", ZONE, -10 HRS}, /* Australian Eastern Time */
{"a.e.s.t.", ZONE, -10 HRS},
{"aesst", DAYZONE, -10 HRS}, /* Australian Eastern Summer Time */
{"a.e.s.s.t.", DAYZONE, -10 HRS},
{"acst", ZONE, -(9 HRS + HALFHR)}, /* Australian Central Time */
{"a.c.s.t.", ZONE, -(9 HRS + HALFHR)},
{"acsst", DAYZONE, -(9 HRS + HALFHR)}, /* Australian Central Summer */
{"a.c.s.s.t.", DAYZONE, -(9 HRS + HALFHR)},
{"awst", ZONE, -8 HRS}, /* Australian Western Time */
{"a.w.s.t.", ZONE, -8 HRS}, /* (no daylight time there, I'm told */
{0, 0, 0}};
struct table unittb[] = {
{"year", MUNIT, 12},
{"month", MUNIT, 1},
{"fortnight", UNIT, 14*24*60},
{"week", UNIT, 7*24*60},
{"day", UNIT, 1*24*60},
{"hour", UNIT, 60},
{"minute", UNIT, 1},
{"min", UNIT, 1},
{"second", SUNIT, 1},
{"sec", SUNIT, 1},
{0, 0, 0}};
struct table othertb[] = {
{"tomorrow", UNIT, 1*24*60},
{"yesterday", UNIT, -1*24*60},
{"today", UNIT, 0},
{"now", UNIT, 0},
{"last", NUMBER, -1},
{"this", UNIT, 0},
{"next", NUMBER, 2},
{"first", NUMBER, 1},
/* {"second", NUMBER, 2}, */
{"third", NUMBER, 3},
{"fourth", NUMBER, 4},
{"fifth", NUMBER, 5},
{"sixth", NUMBER, 6},
{"seventh", NUMBER, 7},
{"eigth", NUMBER, 8},
{"ninth", NUMBER, 9},
{"tenth", NUMBER, 10},
{"eleventh", NUMBER, 11},
{"twelfth", NUMBER, 12},
{"ago", AGO, 1},
{0, 0, 0}};
struct table milzone[] = {
{"a", ZONE, 1 HRS},
{"b", ZONE, 2 HRS},
{"c", ZONE, 3 HRS},
{"d", ZONE, 4 HRS},
{"e", ZONE, 5 HRS},
{"f", ZONE, 6 HRS},
{"g", ZONE, 7 HRS},
{"h", ZONE, 8 HRS},
{"i", ZONE, 9 HRS},
{"k", ZONE, 10 HRS},
{"l", ZONE, 11 HRS},
{"m", ZONE, 12 HRS},
{"n", ZONE, -1 HRS},
{"o", ZONE, -2 HRS},
{"p", ZONE, -3 HRS},
{"q", ZONE, -4 HRS},
{"r", ZONE, -5 HRS},
{"s", ZONE, -6 HRS},
{"t", ZONE, -7 HRS},
{"u", ZONE, -8 HRS},
{"v", ZONE, -9 HRS},
{"w", ZONE, -10 HRS},
{"x", ZONE, -11 HRS},
{"y", ZONE, -12 HRS},
{"z", ZONE, 0 HRS},
{0, 0, 0}};
lookup(id) char *id;
{
#define gotit (yylval=i->value, i->type)
#define getid for(j=idvar, k=id; *j++ = *k++; )
char idvar[20];
register char *j, *k;
register struct table *i;
int abbrev;
getid;
if (strlen(idvar) == 3) abbrev = 1;
else if (strlen(idvar) == 4 && idvar[3] == '.') {
abbrev = 1;
idvar[3] = '\0';
}
else abbrev = 0;
if (islower(*idvar)) *idvar = toupper(*idvar);
for (i = mdtab; i->name; i++) {
k = idvar;
for (j = i->name; *j++ == *k++;) {
if (abbrev && j==i->name+3) return gotit;
if (j[-1] == 0) return gotit;
}
}
getid;
for (i = mztab; i->name; i++)
if (strcmp(i->name, idvar) == 0) return gotit;
for (j = idvar; *j; j++)
if (isupper(*j)) *j = tolower(*j);
for (i=mztab; i->name; i++)
if (strcmp(i->name, idvar) == 0) return gotit;
getid;
for (i=unittb; i->name; i++)
if (strcmp(i->name, idvar) == 0) return gotit;
if (idvar[strlen(idvar)-1] == 's')
idvar[strlen(idvar)-1] = '\0';
for (i=unittb; i->name; i++)
if (strcmp(i->name, idvar) == 0) return gotit;
getid;
for (i = othertb; i->name; i++)
if (strcmp(i->name, idvar) == 0) return gotit;
getid;
if (strlen(idvar) == 1 && isalpha(*idvar)) {
if (isupper(*idvar)) *idvar = tolower(*idvar);
for (i = milzone; i->name; i++)
if (strcmp(i->name, idvar) == 0) return gotit;
}
return(ID);
}
#ifdef AMIGA
struct fake_timeb { time_t time; long timezone; };
# define TIME_T struct fake_timeb
#else
# define TIME_T struct timeb
#endif /* AMIGA */
time_t getdate(p, now)
char *p;
TIME_T *now;
{
#define mcheck(f) if (f>1) err++
time_t monthadd();
int err;
struct tm *lt;
time_t sdate, tod;
TIME_T ftz;
lptr = p;
if (now == ((TIME_T *) NULL)) {
now = &ftz;
#ifdef AMIGA
(void) time(&ftz);
now->timezone = timezone;
#else
ftime(&ftz);
#endif /* AMIGA */
}
lt = localtime(&now->time);
year = lt->tm_year;
month = lt->tm_mon+1;
day = lt->tm_mday;
relsec = 0; relmonth = 0;
timeflag = 0, zoneflag = 0, dateflag = 0, dayflag = 0, relflag = 0;
ourzone = now->timezone;
daylight = MAYBE;
hh = mm = ss = 0;
merid = 24;
if (err = yyparse()) return (-1);
mcheck(timeflag);
mcheck(zoneflag);
mcheck(dateflag);
mcheck(dayflag);
if (err) return (-1);
if (dateflag || timeflag || dayflag) {
sdate = dateconv(month,day,year,hh,mm,ss,merid,ourzone,daylight);
if (sdate < 0) return -1;
} else {
sdate = now->time;
if (relflag == 0)
sdate -= (lt->tm_sec + lt->tm_min*60 +
lt->tm_hour*(60L*60L));
}
sdate += relsec;
sdate += monthadd(sdate, relmonth);
if (dayflag && !dateflag) {
tod = dayconv(dayord, dayreq, sdate);
sdate += tod;
}
return sdate;
}
void yyerror(s)
char *s;
{
return;
}