2 * parsetime.c - parse time for at(1)
3 * Copyright (C) 1993, 1994 Thomas Koenig
5 * modifications for English-language times
6 * Copyright (C) 1993 David Parsons
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. The name of the author(s) may not be used to endorse or promote
14 * products derived from this software without specific prior written
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 * at [NOW] PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS
29 * /NUMBER [DOT NUMBER] [AM|PM]\ /[MONTH NUMBER [NUMBER]] \
30 * |NOON | |[TOMORROW] |
31 * |MIDNIGHT | |[DAY OF WEEK] |
32 * \TEATIME / |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
33 * \PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS/
35 * $FreeBSD: src/usr.bin/at/parsetime.c,v 1.27 2005/08/18 08:18:02 stefanf Exp $
40 #include <sys/types.h>
54 #include "parsetime.h"
57 /* Structures and unions */
60 MIDNIGHT
, NOON
, TEATIME
,
61 PM
, AM
, TOMORROW
, TODAY
, NOW
,
62 MINUTES
, HOURS
, DAYS
, WEEKS
, MONTHS
, YEARS
,
63 NUMBER
, PLUS
, DOT
, SLASH
, ID
, JUNK
,
64 JAN
, FEB
, MAR
, APR
, MAY
, JUN
,
65 JUL
, AUG
, SEP
, OCT
, NOV
, DEC
,
66 SUN
, MON
, TUE
, WED
, THU
, FRI
, SAT
69 /* parse translation table - table driven parsers can be your FRIEND!
72 const char *name
; /* token name */
73 int value
; /* token id */
74 int plural
; /* is this plural? */
76 { "midnight", MIDNIGHT
,0 }, /* 00:00:00 of today or tomorrow */
77 { "noon", NOON
,0 }, /* 12:00:00 of today or tomorrow */
78 { "teatime", TEATIME
,0 }, /* 16:00:00 of today or tomorrow */
79 { "am", AM
,0 }, /* morning times for 0-12 clock */
80 { "pm", PM
,0 }, /* evening times for 0-12 clock */
81 { "tomorrow", TOMORROW
,0 }, /* execute 24 hours from time */
82 { "today", TODAY
, 0 }, /* execute today - don't advance time */
83 { "now", NOW
,0 }, /* opt prefix for PLUS */
85 { "minute", MINUTES
,0 }, /* minutes multiplier */
86 { "minutes", MINUTES
,1 }, /* (pluralized) */
87 { "hour", HOURS
,0 }, /* hours ... */
88 { "hours", HOURS
,1 }, /* (pluralized) */
89 { "day", DAYS
,0 }, /* days ... */
90 { "days", DAYS
,1 }, /* (pluralized) */
91 { "week", WEEKS
,0 }, /* week ... */
92 { "weeks", WEEKS
,1 }, /* (pluralized) */
93 { "month", MONTHS
,0 }, /* month ... */
94 { "months", MONTHS
,1 }, /* (pluralized) */
95 { "year", YEARS
,0 }, /* year ... */
96 { "years", YEARS
,1 }, /* (pluralized) */
109 { "january", JAN
,0 },
110 { "february", FEB
,0 },
117 { "september", SEP
,0 },
118 { "october", OCT
,0 },
119 { "november", NOV
,0 },
120 { "december", DEC
,0 },
121 { "sunday", SUN
, 0 },
123 { "monday", MON
, 0 },
125 { "tuesday", TUE
, 0 },
127 { "wednesday", WED
, 0 },
129 { "thursday", THU
, 0 },
131 { "friday", FRI
, 0 },
133 { "saturday", SAT
, 0 },
137 /* File scope variables */
139 static char **scp
; /* scanner - pointer at arglist */
140 static char scc
; /* scanner - count of remaining arguments */
141 static char *sct
; /* scanner - next char pointer in current argument */
142 static int need
; /* scanner - need to advance to next argument */
144 static char *sc_token
; /* scanner - token buffer */
145 static size_t sc_len
; /* scanner - length of token buffer */
146 static int sc_tokid
; /* scanner - token id */
147 static int sc_tokplur
; /* scanner - is token plural? */
149 /* Local functions */
152 * parse a token, checking if it's something special to us
155 parse_token(char *arg
)
159 for (i
=0; i
<(sizeof Specials
/sizeof Specials
[0]); i
++)
160 if (strcasecmp(Specials
[i
].name
, arg
) == 0) {
161 sc_tokplur
= Specials
[i
].plural
;
162 return sc_tokid
= Specials
[i
].value
;
165 /* not special - must be some random id */
171 * init_scanner() sets up the scanner to eat arguments
174 init_scanner(int argc
, char **argv
)
181 sc_len
+= strlen(*argv
++);
183 if ((sc_token
= malloc(sc_len
)) == NULL
)
184 errx(EXIT_FAILURE
, "virtual memory exhausted");
188 * token() fetches a token from the input stream
196 memset(sc_token
, 0, sc_len
);
201 /* if we need to read another argument, walk along the argument list;
202 * when we fall off the arglist, we'll just return EOF forever
212 /* eat whitespace now - if we walk off the end of the argument,
213 * we'll continue, which puts us up at the top of the while loop
214 * to fetch the next argument in
216 while (isspace(*sct
))
223 /* preserve the first character of the new token
225 sc_token
[0] = *sct
++;
227 /* then see what it is
229 if (isdigit(sc_token
[0])) {
230 while (isdigit(*sct
))
231 sc_token
[++idx
] = *sct
++;
233 return sc_tokid
= NUMBER
;
235 else if (isalpha(sc_token
[0])) {
236 while (isalpha(*sct
))
237 sc_token
[++idx
] = *sct
++;
239 return parse_token(sc_token
);
241 else if (sc_token
[0] == ':' || sc_token
[0] == '.')
242 return sc_tokid
= DOT
;
243 else if (sc_token
[0] == '+')
244 return sc_tokid
= PLUS
;
245 else if (sc_token
[0] == '/')
246 return sc_tokid
= SLASH
;
248 return sc_tokid
= JUNK
;
254 * plonk() gives an appropriate error message if a token is incorrect
259 panic((tok
== EOF
) ? "incomplete time"
265 * expect() gets a token and dies most horribly if it's not the token we want
270 if (token() != desired
)
271 plonk(sc_tokid
); /* and we die here... */
276 * plus() parses a now + time
278 * at [NOW] PLUS NUMBER [MINUTES|HOURS|DAYS|WEEKS|MONTHS|YEARS]
290 delay
= atoi(sc_token
);
291 expectplur
= (delay
!= 1) ? 1 : 0;
295 tm
->tm_year
+= delay
;
304 tm
->tm_mday
+= delay
;
307 tm
->tm_hour
+= delay
;
317 if (expectplur
!= sc_tokplur
)
318 warnx("pluralization is wrong");
328 * tod() computes the time of day
329 * [NUMBER [DOT NUMBER] [AM|PM]]
334 int hour
, minute
= 0;
337 hour
= atoi(sc_token
);
338 tlen
= strlen(sc_token
);
340 /* first pick out the time of day - if it's 4 digits, we assume
341 * a HHMM time, otherwise it's HH DOT MM time
343 if (token() == DOT
) {
345 minute
= atoi(sc_token
);
347 panic("garbled time");
350 else if (tlen
== 4) {
353 panic("garbled time");
357 /* check if an AM or PM specifier was given
359 if (sc_tokid
== AM
|| sc_tokid
== PM
) {
361 panic("garbled time");
363 if (sc_tokid
== PM
) {
364 if (hour
!= 12) /* 12:xx PM is 12:xx, not 24:xx */
367 if (hour
== 12) /* 12:xx AM is 00:xx, not 12:xx */
373 panic("garbled time");
375 /* if we specify an absolute time, we don't want to bump the day even
376 * if we've gone past that time - but if we're specifying a time plus
377 * a relative offset, it's okay to bump things
379 if ((sc_tokid
== EOF
|| sc_tokid
== PLUS
) && tm
->tm_hour
> hour
) {
386 if (tm
->tm_hour
== 24) {
394 * assign_date() assigns a date, wrapping to next year if needed
397 assign_date(struct tm
*tm
, long mday
, long mon
, long year
)
401 * Convert year into tm_year format (year - 1900).
402 * We may be given the year in 2 digit, 4 digit, or tm_year format.
406 year
-= 1900; /* convert from 4 digit year */
407 else if (year
< 100) {
408 /* convert from 2 digit year */
413 lt
= localtime(&now
);
415 /* Convert to tm_year assuming current century */
416 year
+= (lt
->tm_year
/ 100) * 100;
418 if (year
== lt
->tm_year
- 1) year
++;
419 else if (year
< lt
->tm_year
)
420 year
+= 100; /* must be in next century */
425 (tm
->tm_mon
> mon
||(tm
->tm_mon
== mon
&& tm
->tm_mday
> mday
)))
426 year
= tm
->tm_year
+ 1;
437 * month() picks apart a month specification
439 * /[<month> NUMBER [NUMBER]] \
442 * |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
443 * \PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS/
449 long mday
= 0, wday
, mon
;
458 /* do something tomorrow */
462 case TODAY
: /* force ourselves to stay in today - no further processing */
466 case JAN
: case FEB
: case MAR
: case APR
: case MAY
: case JUN
:
467 case JUL
: case AUG
: case SEP
: case OCT
: case NOV
: case DEC
:
468 /* do month mday [year]
470 mon
= (sc_tokid
-JAN
);
472 mday
= atol(sc_token
);
473 if (token() == NUMBER
) {
474 year
= atol(sc_token
);
477 assign_date(tm
, mday
, mon
, year
);
480 case SUN
: case MON
: case TUE
:
481 case WED
: case THU
: case FRI
:
483 /* do a particular day of the week
485 wday
= (sc_tokid
-SUN
);
489 /* if this day is < today, then roll to next week
491 if (wday
< tm
->tm_wday
)
492 mday
+= 7 - (tm
->tm_wday
- wday
);
494 mday
+= (wday
- tm
->tm_wday
);
498 assign_date(tm
, mday
, tm
->tm_mon
, tm
->tm_year
);
502 /* get numeric MMDDYY, mm/dd/yy, or dd.mm.yy
504 tlen
= strlen(sc_token
);
505 mon
= atol(sc_token
);
508 if (sc_tokid
== SLASH
|| sc_tokid
== DOT
) {
513 mday
= atol(sc_token
);
514 if (token() == sep
) {
516 year
= atol(sc_token
);
520 /* flip months and days for European timing
528 else if (tlen
== 6 || tlen
== 8) {
530 year
= (mon
% 10000) - 1900;
541 panic("garbled time");
544 if (mon
< 0 || mon
> 11 || mday
< 1 || mday
> 31)
545 panic("garbled time");
547 assign_date(tm
, mday
, mon
, year
);
553 /* Global functions */
556 parsetime(int argc
, char **argv
)
558 /* Do the argument parsing, die if necessary, and return the time the job
561 time_t nowtimer
, runtimer
;
562 struct tm nowtime
, runtime
;
564 /* this MUST be initialized to zero for midnight/noon/teatime */
566 nowtimer
= time(NULL
);
567 nowtime
= *localtime(&nowtimer
);
571 runtime
.tm_isdst
= 0;
576 init_scanner(argc
-optind
, argv
+optind
);
583 /* now is optional prefix for PLUS tree */
595 /* evil coding for TEATIME|NOON|MIDNIGHT - we've initialised
596 * hr to zero up above, then fall into this case in such a
597 * way so we add +12 +4 hours to it for teatime, +12 hours
598 * to it for noon, and nothing at all for midnight, then
599 * set our runtime to that hour before leaping into the
609 if (runtime
.tm_hour
>= hr
) {
613 runtime
.tm_hour
= hr
;
620 } /* ugly case statement */
623 /* convert back to time_t
625 runtime
.tm_isdst
= -1;
626 runtimer
= mktime(&runtime
);
629 panic("garbled time");
631 if (nowtimer
> runtimer
)
632 panic("trying to travel back in time");