Annotation of src/usr.bin/at/parsetime.c, Revision 1.4
1.4 ! millert 1: /* $OpenBSD: parsetime.c,v 1.3 1996/06/26 05:31:29 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: parsetime.c,v 1.3 1995/03/25 18:13:36 glass Exp $ */
3:
4: /*
5: * parsetime.c - parse time for at(1)
1.4 ! millert 6: * Copyright (C) 1993, 1994 Thomas Koenig
1.1 deraadt 7: *
8: * modifications for english-language times
9: * Copyright (C) 1993 David Parsons
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. The name of the author(s) may not be used to endorse or promote
17: * products derived from this software without specific prior written
18: * permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
21: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1.4 ! millert 23: * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
1.1 deraadt 24: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27: * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30: *
31: * at [NOW] PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS
32: * /NUMBER [DOT NUMBER] [AM|PM]\ /[MONTH NUMBER [NUMBER]] \
33: * |NOON | |[TOMORROW] |
1.4 ! millert 34: * |MIDNIGHT | |[DAY OF WEEK] |
! 35: * \TEATIME / |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
! 36: * \PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS/
1.1 deraadt 37: */
38:
39: /* System Headers */
40:
41: #include <sys/types.h>
42: #include <errno.h>
43: #include <stdio.h>
44: #include <stdlib.h>
45: #include <string.h>
46: #include <time.h>
47: #include <unistd.h>
48: #include <ctype.h>
49:
50: /* Local headers */
51:
52: #include "at.h"
53: #include "panic.h"
54:
55:
56: /* Structures and unions */
57:
58: enum { /* symbols */
1.4 ! millert 59: MIDNIGHT, NOON, TEATIME,
! 60: PM, AM, TOMORROW, TODAY, NOW,
! 61: MINUTES, HOURS, DAYS, WEEKS,
! 62: NUMBER, PLUS, DOT, SLASH, ID, JUNK,
! 63: JAN, FEB, MAR, APR, MAY, JUN,
! 64: JUL, AUG, SEP, OCT, NOV, DEC,
! 65: SUN, MON, TUE, WED, THU, FRI, SAT
1.1 deraadt 66: };
67:
68: /*
69: * parse translation table - table driven parsers can be your FRIEND!
70: */
71: struct {
1.4 ! millert 72: char *name; /* token name */
! 73: int value; /* token id */
! 74: int plural; /* is this plural? */
1.1 deraadt 75: } Specials[] = {
1.4 ! millert 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 */
! 84:
! 85: { "minute", MINUTES, 0 }, /* minutes multiplier */
! 86: { "min", MINUTES, 0 },
! 87: { "m", MINUTES, 0 },
! 88: { "minutes", MINUTES, 1 }, /* (pluralized) */
! 89: { "hour", HOURS, 0 }, /* hours ... */
! 90: { "hr", HOURS, 0 }, /* abbreviated */
! 91: { "h", HOURS, 0 },
! 92: { "hours", HOURS, 1 }, /* (pluralized) */
! 93: { "day", DAYS, 0 }, /* days ... */
! 94: { "d", DAYS, 0 },
! 95: { "days", DAYS, 1 }, /* (pluralized) */
! 96: { "week", WEEKS, 0 }, /* week ... */
! 97: { "w", WEEKS, 0 },
! 98: { "weeks", WEEKS, 1 }, /* (pluralized) */
! 99: { "jan", JAN, 0 },
! 100: { "feb", FEB, 0 },
! 101: { "mar", MAR, 0 },
! 102: { "apr", APR, 0 },
! 103: { "may", MAY, 0 },
! 104: { "jun", JUN, 0 },
! 105: { "jul", JUL, 0 },
! 106: { "aug", AUG, 0 },
! 107: { "sep", SEP, 0 },
! 108: { "oct", OCT, 0 },
! 109: { "nov", NOV, 0 },
! 110: { "dec", DEC, 0 },
! 111: { "sunday", SUN, 0 },
! 112: { "sun", SUN, 0 },
! 113: { "monday", MON, 0 },
! 114: { "mon", MON, 0 },
! 115: { "tuesday", TUE, 0 },
! 116: { "tue", TUE, 0 },
! 117: { "wednesday", WED, 0 },
! 118: { "wed", WED, 0 },
! 119: { "thursday", THU, 0 },
! 120: { "thu", THU, 0 },
! 121: { "friday", FRI, 0 },
! 122: { "fri", FRI, 0 },
! 123: { "saturday", SAT, 0 },
! 124: { "sat", SAT, 0 },
! 125: };
1.1 deraadt 126:
127: /* File scope variables */
128:
129: static char **scp; /* scanner - pointer at arglist */
130: static char scc; /* scanner - count of remaining arguments */
131: static char *sct; /* scanner - next char pointer in current argument */
132: static int need; /* scanner - need to advance to next argument */
133:
134: static char *sc_token; /* scanner - token buffer */
135: static size_t sc_len; /* scanner - lenght of token buffer */
136: static int sc_tokid; /* scanner - token id */
1.4 ! millert 137: static int sc_tokplur; /* scanner - is token plural? */
1.1 deraadt 138:
139: #ifndef lint
1.4 ! millert 140: static char rcsid[] = "$OpenBSD: parsetime.c,v 1.3 1996/06/26 05:31:29 deraadt Exp $";
1.1 deraadt 141: #endif
142:
143: /* Local functions */
144:
145: /*
146: * parse a token, checking if it's something special to us
147: */
148: static int
149: parse_token(arg)
150: char *arg;
151: {
1.4 ! millert 152: int i;
1.1 deraadt 153:
1.4 ! millert 154: for (i=0; i < sizeof(Specials) / sizeof(Specials[0]); i++) {
! 155: if (strcasecmp(Specials[i].name, arg) == 0) {
! 156: sc_tokplur = Specials[i].plural;
! 157: return (sc_tokid = Specials[i].value);
! 158: }
1.1 deraadt 159: }
160:
1.4 ! millert 161: /* not special - must be some random id */
! 162: return (ID);
1.1 deraadt 163: } /* parse_token */
164:
165:
166: /*
167: * init_scanner() sets up the scanner to eat arguments
168: */
169: static void
170: init_scanner(argc, argv)
171: int argc;
172: char **argv;
173: {
1.4 ! millert 174: scp = argv;
! 175: scc = argc;
! 176: need = 1;
! 177: sc_len = 1;
! 178: while (argc-- > 0)
! 179: sc_len += strlen(*argv++);
! 180:
! 181: if ((sc_token = (char *) malloc(sc_len)) == NULL)
! 182: panic("Insufficient virtual memory");
1.1 deraadt 183: } /* init_scanner */
184:
185: /*
186: * token() fetches a token from the input stream
187: */
188: static int
189: token()
190: {
1.4 ! millert 191: int idx;
1.1 deraadt 192:
1.4 ! millert 193: while (1) {
! 194: (void)memset(sc_token, 0, sc_len);
! 195: sc_tokid = EOF;
! 196: sc_tokplur = 0;
! 197: idx = 0;
1.1 deraadt 198:
1.4 ! millert 199: /*
! 200: * if we need to read another argument, walk along the
! 201: * argument list; when we fall off the arglist, we'll
! 202: * just return EOF forever
! 203: */
! 204: if (need) {
! 205: if (scc < 1)
! 206: return (sc_tokid);
! 207: sct = *scp;
! 208: scp++;
! 209: scc--;
! 210: need = 0;
! 211: }
! 212: /*
! 213: * eat whitespace now - if we walk off the end of the argument,
! 214: * we'll continue, which puts us up at the top of the while loop
! 215: * to fetch the next argument in
! 216: */
! 217: while (isspace(*sct))
! 218: ++sct;
! 219: if (!*sct) {
! 220: need = 1;
! 221: continue;
! 222: }
1.1 deraadt 223:
1.4 ! millert 224: /*
! 225: * preserve the first character of the new token
! 226: */
! 227: sc_token[0] = *sct++;
1.1 deraadt 228:
1.4 ! millert 229: /*
! 230: * then see what it is
! 231: */
! 232: if (isdigit(sc_token[0])) {
! 233: while (isdigit(*sct))
! 234: sc_token[++idx] = *sct++;
! 235: sc_token[++idx] = 0;
! 236: return ((sc_tokid = NUMBER));
! 237: } else if (isalpha(sc_token[0])) {
! 238: while (isalpha(*sct))
! 239: sc_token[++idx] = *sct++;
! 240: sc_token[++idx] = 0;
! 241: return (parse_token(sc_token));
! 242: }
! 243: else if (sc_token[0] == ':' || sc_token[0] == '.')
! 244: return ((sc_tokid = DOT));
! 245: else if (sc_token[0] == '+')
! 246: return ((sc_tokid = PLUS));
! 247: else if (sc_token[0] == '/')
! 248: return ((sc_tokid = SLASH));
! 249: else
! 250: return ((sc_tokid = JUNK));
! 251: } /* while (1) */
1.1 deraadt 252: } /* token */
253:
254:
255: /*
256: * plonk() gives an appropriate error message if a token is incorrect
257: */
258: static void
259: plonk(tok)
260: int tok;
261: {
1.4 ! millert 262: panic((tok == EOF) ? "incomplete time" : "garbled time");
1.1 deraadt 263: } /* plonk */
264:
265:
266: /*
267: * expect() gets a token and dies most horribly if it's not the token we want
268: */
269: static void
270: expect(desired)
271: int desired;
272: {
1.4 ! millert 273: if (token() != desired)
! 274: plonk(sc_tokid); /* and we die here... */
1.1 deraadt 275: } /* expect */
276:
277:
278: /*
279: * dateadd() adds a number of minutes to a date. It is extraordinarily
280: * stupid regarding day-of-month overflow, and will most likely not
281: * work properly
282: */
283: static void
284: dateadd(minutes, tm)
285: int minutes;
286: struct tm *tm;
287: {
1.4 ! millert 288: /* increment days */
1.1 deraadt 289:
1.4 ! millert 290: while (minutes > 24*60) {
! 291: minutes -= 24*60;
! 292: tm->tm_mday++;
1.1 deraadt 293: }
294:
1.4 ! millert 295: /* increment hours */
! 296: while (minutes > 60) {
! 297: minutes -= 60;
! 298: tm->tm_hour++;
! 299: if (tm->tm_hour > 23) {
! 300: tm->tm_mday++;
! 301: tm->tm_hour = 0;
! 302: }
! 303: }
! 304:
! 305: /* increment minutes */
! 306: tm->tm_min += minutes;
1.1 deraadt 307:
1.4 ! millert 308: if (tm->tm_min > 59) {
! 309: tm->tm_hour++;
! 310: tm->tm_min -= 60;
! 311:
! 312: if (tm->tm_hour > 23) {
! 313: tm->tm_mday++;
! 314: tm->tm_hour = 0;
! 315: }
1.1 deraadt 316: }
317: } /* dateadd */
318:
319:
320: /*
321: * plus() parses a now + time
322: *
323: * at [NOW] PLUS NUMBER [MINUTES|HOURS|DAYS|WEEKS]
324: *
325: */
326: static void
327: plus(tm)
328: struct tm *tm;
329: {
1.4 ! millert 330: int delay;
! 331: int expectplur;
! 332:
! 333: expect(NUMBER);
1.1 deraadt 334:
1.4 ! millert 335: delay = atoi(sc_token);
! 336: expectplur = (delay != 1) ? 1 : 0;
1.1 deraadt 337:
1.4 ! millert 338: switch (token()) {
! 339: case WEEKS:
! 340: delay *= 7;
! 341: case DAYS:
! 342: delay *= 24;
! 343: case HOURS:
! 344: delay *= 60;
! 345: case MINUTES:
! 346: if (expectplur != sc_tokplur)
! 347: (void)fprintf(stderr, "at: pluralization is wrong\n");
! 348: dateadd(delay, tm);
! 349: return;
! 350: }
1.1 deraadt 351:
1.4 ! millert 352: plonk(sc_tokid);
1.1 deraadt 353: } /* plus */
354:
355:
356: /*
357: * tod() computes the time of day
358: * [NUMBER [DOT NUMBER] [AM|PM]]
359: */
360: static void
361: tod(tm)
362: struct tm *tm;
363: {
1.4 ! millert 364: int hour, minute = 0;
! 365: size_t tlen;
! 366:
! 367: hour = atoi(sc_token);
! 368: tlen = strlen(sc_token);
! 369:
! 370: /*
! 371: * first pick out the time of day - if it's 4 digits, we assume
! 372: * a HHMM time, otherwise it's HH DOT MM time
! 373: */
! 374: if (token() == DOT) {
! 375: expect(NUMBER);
! 376: minute = atoi(sc_token);
! 377: if (minute > 59)
! 378: panic("garbled time");
! 379: token();
! 380: } else if (tlen == 4) {
! 381: minute = hour % 100;
! 382: if (minute > 59)
! 383: panic("garbled time");
! 384: hour = hour / 100;
! 385: }
1.1 deraadt 386:
1.4 ! millert 387: /*
! 388: * check if an AM or PM specifier was given
! 389: */
! 390: if (sc_tokid == AM || sc_tokid == PM) {
! 391: if (hour > 12)
! 392: panic("garbled time");
! 393:
! 394: if (sc_tokid == PM) {
! 395: if (hour != 12) /* 12:xx PM is 12:xx, not 24:xx */
! 396: hour += 12;
! 397: } else {
! 398: if (hour == 12) /* 12:xx AM is 00:xx, not 12:xx */
! 399: hour = 0;
! 400: }
! 401: token();
! 402: } else if (hour > 23)
! 403: panic("garbled time");
1.1 deraadt 404:
1.4 ! millert 405: /*
! 406: * if we specify an absolute time, we don't want to bump the day even
! 407: * if we've gone past that time - but if we're specifying a time plus
! 408: * a relative offset, it's okay to bump things
! 409: */
! 410: if ((sc_tokid == EOF || sc_tokid == PLUS) && tm->tm_hour > hour) {
! 411: tm->tm_mday++;
! 412: tm->tm_wday++;
! 413: }
1.1 deraadt 414:
1.4 ! millert 415: tm->tm_hour = hour;
! 416: tm->tm_min = minute;
! 417: if (tm->tm_hour == 24) {
! 418: tm->tm_hour = 0;
! 419: tm->tm_mday++;
! 420: }
1.1 deraadt 421: } /* tod */
422:
423:
424: /*
425: * assign_date() assigns a date, wrapping to next year if needed
426: */
427: static void
428: assign_date(tm, mday, mon, year)
429: struct tm *tm;
1.4 ! millert 430: int mday, mon, year;
1.1 deraadt 431: {
1.4 ! millert 432: if (year > 99) {
! 433: if (year > 1899)
! 434: year -= 1900;
! 435: else
! 436: panic("garbled time");
! 437: }
! 438:
! 439: if (year < 0 &&
! 440: (tm->tm_mon > mon ||(tm->tm_mon == mon && tm->tm_mday > mday)))
! 441: year = tm->tm_year + 1;
1.1 deraadt 442:
1.4 ! millert 443: tm->tm_mday = mday;
! 444: tm->tm_mon = mon;
1.1 deraadt 445:
1.4 ! millert 446: if (year >= 0)
! 447: tm->tm_year = year;
1.1 deraadt 448: } /* assign_date */
449:
450:
451: /*
452: * month() picks apart a month specification
453: *
454: * /[<month> NUMBER [NUMBER]] \
455: * |[TOMORROW] |
1.4 ! millert 456: * |[DAY OF WEEK] |
1.1 deraadt 457: * |NUMBER [SLASH NUMBER [SLASH NUMBER]]|
458: * \PLUS NUMBER MINUTES|HOURS|DAYS|WEEKS/
459: */
460: static void
461: month(tm)
462: struct tm *tm;
463: {
1.4 ! millert 464: int year = (-1);
! 465: int mday, wday, mon;
! 466: size_t tlen;
! 467:
! 468: switch (sc_tokid) {
! 469: case PLUS:
! 470: plus(tm);
! 471: break;
! 472:
! 473: case TOMORROW:
! 474: /* do something tomorrow */
! 475: tm->tm_mday++;
! 476: tm->tm_wday++;
! 477: case TODAY:
! 478: /* force ourselves to stay in today - no further processing */
1.1 deraadt 479: token();
1.4 ! millert 480: break;
1.1 deraadt 481:
1.4 ! millert 482: case JAN: case FEB: case MAR: case APR: case MAY: case JUN:
! 483: case JUL: case AUG: case SEP: case OCT: case NOV: case DEC:
! 484: /*
! 485: * do month mday [year]
! 486: */
! 487: mon = sc_tokid - JAN;
1.1 deraadt 488: expect(NUMBER);
1.4 ! millert 489: mday = atoi(sc_token);
! 490: if (token() == NUMBER) {
! 491: year = atoi(sc_token);
! 492: token();
1.1 deraadt 493: }
1.4 ! millert 494: assign_date(tm, mday, mon, year);
! 495: break;
! 496:
! 497: case SUN: case MON: case TUE:
! 498: case WED: case THU: case FRI:
! 499: case SAT:
! 500: /* do a particular day of the week */
! 501: wday = sc_tokid - SUN;
! 502:
! 503: mday = tm->tm_mday;
! 504:
! 505: /* if this day is < today, then roll to next week */
! 506: if (wday < tm->tm_wday)
! 507: mday += 7 - (tm->tm_wday - wday);
! 508: else
! 509: mday += (wday - tm->tm_wday);
! 510:
! 511: tm->tm_wday = wday;
! 512:
! 513: assign_date(tm, mday, tm->tm_mon, tm->tm_year);
! 514: break;
1.1 deraadt 515:
1.4 ! millert 516: case NUMBER:
1.1 deraadt 517: /*
1.4 ! millert 518: * get numeric MMDDYY, mm/dd/yy, or dd.mm.yy
1.1 deraadt 519: */
1.4 ! millert 520: tlen = strlen(sc_token);
! 521: mon = atoi(sc_token);
! 522: token();
1.1 deraadt 523:
1.4 ! millert 524: if (sc_tokid == SLASH || sc_tokid == DOT) {
! 525: int sep;
1.1 deraadt 526:
1.4 ! millert 527: sep = sc_tokid;
! 528: expect(NUMBER);
! 529: mday = atoi(sc_token);
! 530: if (token() == sep) {
! 531: expect(NUMBER);
! 532: year = atoi(sc_token);
! 533: token();
! 534: }
! 535:
! 536: /*
! 537: * flip months and days for european timing
! 538: */
! 539: if (sep == DOT) {
! 540: int x = mday;
! 541: mday = mon;
! 542: mon = x;
! 543: }
! 544: } else if (tlen == 6 || tlen == 8) {
! 545: if (tlen == 8) {
! 546: year = (mon % 10000) - 1900;
! 547: mon /= 10000;
! 548: } else {
! 549: year = mon % 100;
! 550: mon /= 100;
! 551: }
! 552: mday = mon % 100;
! 553: mon /= 100;
! 554: } else
! 555: panic("garbled time");
! 556:
! 557: mon--;
! 558: if (mon < 0 || mon > 11 || mday < 1 || mday > 31)
! 559: panic("garbled time");
! 560:
! 561: assign_date(tm, mday, mon, year);
! 562: break;
! 563: } /* case */
1.1 deraadt 564: } /* month */
565:
566:
567: /* Global functions */
568:
569: time_t
570: parsetime(argc, argv)
571: int argc;
572: char **argv;
573: {
1.4 ! millert 574: /*
! 575: * Do the argument parsing, die if necessary, and return the
! 576: * time the job should be run.
! 577: */
! 578: time_t nowtimer, runtimer;
! 579: struct tm nowtime, runtime;
! 580: int hr = 0;
! 581: /* this MUST be initialized to zero for midnight/noon/teatime */
! 582:
! 583: nowtimer = time(NULL);
! 584: nowtime = *localtime(&nowtimer);
! 585:
! 586: runtime = nowtime;
! 587: runtime.tm_sec = 0;
! 588: runtime.tm_isdst = 0;
! 589:
! 590: if (argc <= optind)
! 591: usage();
! 592:
! 593: init_scanner(argc - optind, argv + optind);
! 594:
! 595: switch (token()) {
! 596: case NOW: /* now is optional prefix for PLUS tree */
! 597: expect(PLUS);
! 598: case PLUS:
! 599: plus(&runtime);
! 600: break;
! 601:
! 602: case NUMBER:
! 603: tod(&runtime);
! 604: month(&runtime);
! 605: break;
! 606:
! 607: /*
! 608: * evil coding for TEATIME|NOON|MIDNIGHT - we've initialised
! 609: * hr to zero up above, then fall into this case in such a
! 610: * way so we add +12 +4 hours to it for teatime, +12 hours
! 611: * to it for noon, and nothing at all for midnight, then
! 612: * set our runtime to that hour before leaping into the
! 613: * month scanner
! 614: */
! 615: case TEATIME:
! 616: hr += 4;
! 617: case NOON:
! 618: hr += 12;
! 619: case MIDNIGHT:
! 620: if (runtime.tm_hour >= hr) {
! 621: runtime.tm_mday++;
! 622: runtime.tm_wday++;
! 623: }
! 624: runtime.tm_hour = hr;
! 625: runtime.tm_min = 0;
! 626: token();
! 627: /* fall through to month setting */
! 628: default:
! 629: month(&runtime);
! 630: break;
! 631: } /* ugly case statement */
! 632: expect(EOF);
! 633:
! 634: /*
! 635: * adjust for daylight savings time
! 636: */
! 637: runtime.tm_isdst = -1;
1.1 deraadt 638: runtimer = mktime(&runtime);
1.4 ! millert 639: if (runtime.tm_isdst > 0) {
! 640: runtimer -= 3600;
! 641: runtimer = mktime(&runtime);
! 642: }
1.1 deraadt 643:
1.4 ! millert 644: if (runtimer < 0)
! 645: panic("garbled time");
1.1 deraadt 646:
1.4 ! millert 647: if (nowtimer > runtimer)
! 648: panic("Trying to travel back in time");
1.1 deraadt 649:
1.4 ! millert 650: return (runtimer);
1.1 deraadt 651: } /* parsetime */
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