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getdate.y
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1991-05-06
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14KB
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630 lines
%token ID MONTH DAY MERIDIAN NUMBER UNIT MUNIT SUNIT ZONE DAYZONE AGO DST
%{
/* Originally from: Steven M. Bellovin (unc!smb) */
/* Dept. of Computer Science */
/* University of North Carolina at Chapel Hill */
/* @(#)getdate.y 2.17 11/30/87 */
/* #include "defs.h" JF not used any more */
#include <sys/types.h>
#ifdef USG
struct timeb
{
time_t time;
unsigned short millitm;
short timezone;
short dstflag;
};
static void ftime ();
#else
#include <sys/timeb.h>
#endif
#include <ctype.h>
#if defined(BSD4_2) || defined (BSD4_1C)
#include <sys/time.h>
#else /* sane */
#include <time.h>
#endif /* sane */
#if defined (STDC_HEADERS) || defined (USG)
#include <string.h>
#endif
#ifdef __GNUC__
#define alloca __builtin_alloca
#else
#ifdef sparc
#include <alloca.h>
#endif
#endif
#ifndef NULL
#define NULL 0
#endif
#define daysec (24L*60L*60L)
static int timeflag, zoneflag, dateflag, dayflag, relflag;
static time_t relsec, relmonth;
static int hh, mm, ss, merid, day_light;
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
static time_t timeconv();
static time_t daylcorr();
static lookup();
static int yylex ();
#define yyparse getdate_yyparse
static int yyerror ();
%}
%%
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 if ($1 > 10000) {
dateflag++;
day= $1%100;
month= ($1/100)%100;
year = month/10000;
} 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;
day_light = 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;
day_light = STANDARD; ourzone = -($6%100 + 60*($6/100));};
zone: ZONE dst
{ourzone = $1; day_light = $2;}
| DAYZONE
{ourzone = $1; day_light = DAYLIGHT;};
dst: /* empty */
{ $$ = STANDARD; }
| DST
{ $$ = 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();
static 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;
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);
}
static time_t
dayconv(ord, day, now)
int ord, day; time_t now;
{
register struct tm *loctime;
time_t tod;
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);
}
static 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);
}
}
static time_t
monthadd(sdate, relmonth)
time_t sdate, relmonth;
{
struct tm *ltime;
time_t dateconv();
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);
}
static 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;
static int
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;
};
static 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
static 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 */
{"dst", DST, 0}, /* Explicit daylight time */
{0, 0, 0}};
static 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}};
static 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}};
static 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}};
static int
lookup(id)
char *id;
{
#define gotit (yylval=i->value, i->type)
char idvar[128];
register char *j, *k;
register struct table *i;
int abbrev;
(void) strcpy(idvar, id);
j = idvar;
k = id - 1;
while (*++k)
*j++ = isupper(*k) ? tolower(*k) : *k;
*j = '\0';
if (strlen(idvar) == 3)
abbrev = 1;
else
if (strlen(idvar) == 4 && idvar[3] == '.' && idvar[1] != '.') {
abbrev = 1;
idvar[3] = '\0';
}
else
abbrev = 0;
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;
}
}
for (i=mztab; i->name; i++)
if (strcmp(i->name, idvar) == 0)
return gotit;
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;
for (i = othertb; i->name; i++)
if (strcmp(i->name, idvar) == 0)
return gotit;
if (strlen(idvar) == 1 && isalpha(*idvar)) {
for (i = milzone; i->name; i++)
if (strcmp(i->name, idvar) == 0)
return gotit;
}
return ID;
}
time_t
getdate(p, now)
char *p;
struct timeb *now;
{
#define mcheck(f) if (f>1) err++
time_t monthadd();
int err;
struct tm *lt;
struct timeb ftz;
time_t sdate, tod;
lptr = p;
if (now == ((struct timeb *) NULL)) {
now = &ftz;
ftime(&ftz);
}
lt = localtime(&now->time);
year = lt->tm_year;
month = lt->tm_mon+1;
day = lt->tm_mday;
relsec = 0; relmonth = 0;
timeflag=zoneflag=dateflag=dayflag=relflag=0;
ourzone = now->timezone;
day_light = 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,day_light);
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;
}
/*
** Have to do *something* with a legitimate -1 so it's distinguishable
** from the error return value. (Alternately could set errno on error.)
*/
return (sdate == -1) ? 0 : sdate;
}
static int
yyerror(s)
char *s;
{
return 0;
}
#ifdef USG
static void
ftime(timeb)
struct timeb *timeb;
{
extern long timezone;
#ifndef DAYLIGHT_MISSING /* Not all non-BSD libraries have `daylight'. */
extern int daylight;
#endif
long t = 0;
localtime(&t); /* Dummy to init timzeone */
time(&(timeb->time));
timeb->millitm=0;
timeb->timezone=timezone/60; /* Timezone is in seconds! */
#ifndef DAYLIGHT_MISSING
timeb->dstflag=daylight;
#else
timeb->dstflag=0;
#endif
}
#endif