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1.1 root 1: /*
2: * Copyright (c) 1983 Regents of the University of California.
3: * All rights reserved. The Berkeley software License Agreement
4: * specifies the terms and conditions for redistribution.
5: */
6:
7: #ifndef lint
8: char copyright[] =
9: "@(#) Copyright (c) 1983 Regents of the University of California.\n\
10: All rights reserved.\n";
11: #endif not lint
12:
13: #ifndef lint
14: static char sccsid[] = "@(#)at.c 5.5 (Berkeley) 1/18/87";
15: #endif not lint
16:
17: /*
18: * Synopsis: at [-s] [-c] [-m] time [filename]
19: *
20: *
21: *
22: * Execute commands at a later date.
23: *
24: *
25: * Modifications by: Steve Wall
26: * Computer Systems Research Group
27: * University of California @ Berkeley
28: *
29: */
30: #include <stdio.h>
31: #include <ctype.h>
32: #include <signal.h>
33: #include <pwd.h>
34: #include <sys/param.h>
35: #include <sys/time.h>
36: #include <sys/file.h>
37:
38: #define HOUR 100 /* 1 hour (using military time) */
39: #define HALFDAY (12 * HOUR) /* half a day (12 hours) */
40: #define FULLDAY (24 * HOUR) /* a full day (24 hours) */
41:
42: #define WEEK 1 /* day requested is 'week' */
43: #define DAY 2 /* day requested is a weekday */
44: #define MONTH 3 /* day requested is a month */
45:
46: #define BOURNE "/bin/sh" /* run commands with Bourne shell*/
47: #define CSHELL "/bin/csh" /* run commands with C shell */
48:
49: #define NODATEFOUND -1 /* no date was given on command line */
50:
51: #define ATDIR "/usr/spool/at" /* spooling area */
52:
53: #define LINSIZ 256 /* length of input buffer */
54:
55: /*
56: * A table to identify potential command line values for "time".
57: *
58: * We need this so that we can do some decent error checking on the
59: * command line arguments. (This was inspired by the old "at", which
60: * accepted "at 900 jan 55" as valid input and other small bugs.
61: */
62: struct datetypes {
63: int type;
64: char *name;
65: } dates_info[22] = {
66: { DAY, "sunday" },
67: { DAY, "monday" },
68: { DAY, "tuesday" },
69: { DAY, "wednesday" },
70: { DAY, "thursday" },
71: { DAY, "friday" },
72: { DAY, "saturday" },
73: { MONTH, "january" },
74: { MONTH, "february" },
75: { MONTH, "march" },
76: { MONTH, "april" },
77: { MONTH, "may" },
78: { MONTH, "june" },
79: { MONTH, "july" },
80: { MONTH, "august" },
81: { MONTH, "september" },
82: { MONTH, "october" },
83: { MONTH, "november" },
84: { MONTH, "december" },
85: { 0, ""},
86: };
87:
88: /*
89: * Months of the year.
90: */
91: char *months[13] = {
92: "jan", "feb", "mar", "apr", "may", "jun",
93: "jul", "aug", "sep", "oct", "nov", "dec", 0,
94: };
95:
96: /*
97: * A table of the number of days in each month of the year.
98: *
99: * yeartable[0] -- normal year
100: * yeartable[1] -- leap year
101: */
102: static int yeartable[2][13] = {
103: { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
104: { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
105: };
106:
107: /*
108: * Structure holding the relevant values needed to create a spoolfile.
109: * "attime" will contain the info about when a job is to be run, and
110: * "nowtime" will contain info about what time the "at" command is in-
111: * voked.
112: */
113: struct times {
114: int year; /* year that job is to be run */
115: int yday; /* day of year that job is to be run */
116: int mon; /* month of year that job is to be run*/
117: int mday; /* day of month that job is to be run */
118: int wday; /* day of week that job is to be run */
119: int hour; /* hour of day that job is to be run */
120: int min; /* min. of hour that job is to be run */
121: } attime, nowtime;
122:
123: char atfile[100]; /* name of spoolfile "yy.ddd.hhhh.??" */
124: char *getenv(); /* get info on user's environment */
125: char **environ; /* user's environment */
126: FILE *spoolfile; /* spool file */
127: FILE *inputfile; /* input file ("stdin" or "filename") */
128: char *getwd(); /* used to get current directory info */
129:
130:
131: main(argc, argv)
132: int argc;
133: char **argv;
134: {
135: int c; /* scratch variable */
136: int usage(); /* print usage info and exit */
137: int cleanup(); /* do cleanup on an interrupt signal */
138: int dateindex = NODATEFOUND; /* if a day is specified, what option
139: is it? (mon day, week, dayofweek) */
140: char *shell = BOURNE; /* what shell do we use to run job? */
141: int shflag = 0; /* override the current shell and run
142: job using the Bourne Shell */
143: int cshflag = 0; /* override the current shell and run
144: job using the Cshell */
145: int mailflag = 0; /* send mail after a job has been run?*/
146: int standardin = 0; /* are we reading from stardard input */
147: char *tmp; /* scratch pointer */
148: char line[LINSIZ]; /* a line from input file */
149: char pwbuf[MAXPATHLEN]; /* the current working directory */
150: char *jobfile = "stdin"; /* file containing job to be run */
151: char *getname(); /* get the login name of a user */
152: int pid; /* For forking for security reasons */
153:
154:
155:
156: argv++; argc--;
157:
158: /*
159: * Interpret command line flags if they exist.
160: */
161: while (argc > 0 && **argv == '-') {
162: (*argv)++;
163: while (**argv) switch (*(*argv)++) {
164:
165: case 'c' : cshflag++;
166: shell = CSHELL;
167: break;
168:
169: case 's' : shflag++;
170: shell = BOURNE;
171: break;
172:
173: case 'm' : mailflag++;
174: break;
175:
176: default : usage();
177:
178: }
179: --argc, ++argv;
180: }
181: if (shflag && cshflag) {
182: fprintf(stderr,"ambiguous shell request.\n");
183: exit(1);
184: }
185:
186: /*
187: * Get the time it is when "at" is invoked. We set both nowtime and
188: * attime to this value so that as we interpret the time the job is to
189: * be run we can compare the two values to determine such things as
190: * whether of not the job should be run the same day the "at" command
191: * is given, whether a job is to be run next year, etc.
192: */
193: getnowtime(&nowtime, &attime);
194:
195: #ifdef DEBUG
196: printit();
197: #endif
198:
199: if (argc <= 0)
200: usage();
201:
202: /*
203: * Interpret argv[1] and create the time of day that the job is to
204: * be run. This is the same function that was used in the old "at"
205: */
206: maketime(&attime, *argv);
207: --argc; ++argv;
208:
209: #ifdef DEBUG
210: printf("\n\nAFTER MAKETIME\n");
211: printit();
212: #endif
213:
214: /*
215: * If argv[(2)] exists, this is a request to run a job on a certain
216: * day of year or a certain day of week.
217: *
218: * We send argv to the function "getdateindex" which returns the
219: * index value of the requested day in the table "dates_info"
220: * (see line 50 for table). If 'getdateindex" returns a NODATEFOUND,
221: * then the requested day format was not found in the table (usually
222: * this means that the argument is a "filename"). If the requested
223: * day is found, we continue to process command line arguments.
224: */
225: if (argc > 0) {
226: if ((dateindex = getdateindex(*argv)) != NODATEFOUND) {
227:
228: ++argv; --argc;
229:
230: /*
231: * Determine the day of year that the job will be run
232: * depending on the value of argv.
233: */
234: makedayofyear(dateindex, &argv, &argc);
235: }
236: }
237:
238: /*
239: * If we get to this point and "dateindex" is set to NODATEFOUND,
240: * then we are dealing with a request with only a "time" specified
241: * (i.e. at 400p) and perhaps 'week' specified (i.e. at 400p week).
242: * If 'week' is specified, we just set excecution for 7 days in the
243: * future. Otherwise, we need to check to see if the requested time
244: * has already passed for the current day. If it has, then we add
245: * one to the day of year that the job will be executed.
246: */
247: if (dateindex == NODATEFOUND) {
248: int daysinyear;
249: if ((argc > 0) && (strcmp(*argv,"week") == 0)) {
250: attime.yday += 7;
251: ++argv; --argc;
252: } else if (istomorrow())
253: ++attime.yday;
254:
255: daysinyear = isleap(attime.year) ? 366 : 365;
256: if (attime.yday >= daysinyear) {
257: attime.yday -= daysinyear;
258: ++attime.year;
259: }
260: }
261:
262: /*
263: * If no more arguments exist, then we are reading
264: * from standard input. Thus, we set the standard
265: * input flag (++standardin).
266: */
267: if (argc <= 0)
268: ++standardin;
269:
270:
271: #ifdef DEBUG
272: printf("\n\nAFTER ADDDAYS\n");
273: printit();
274: #endif
275:
276: /*
277: * Start off assuming we're going to read from standard input,
278: * but if a filename has been given to read from, we will open it
279: * later.
280: */
281: inputfile = stdin;
282:
283: /*
284: * Create the filename for the spoolfile.
285: */
286: makeatfile(atfile,attime.year,attime.yday,attime.hour,attime.min);
287:
288: /*
289: * Open the spoolfile for writing.
290: */
291: if ((spoolfile = fopen(atfile, "w")) == NULL){
292: perror(atfile);
293: exit(1);
294: }
295:
296: /*
297: * Make the file not world readable.
298: */
299: fchmod(fileno(spoolfile), 0400);
300:
301: /*
302: * The protection mechanism works like this:
303: * We are running ruid=user, euid=spool owner. So far we have been
304: * messing around in the spool directory, so we needed to run
305: * as the owner of the spool directory.
306: * We now need to switch to the user's effective uid
307: * to simplify permission checking. However, we fork first,
308: * so that we can clean up if interrupted.
309: */
310: signal(SIGINT, SIG_IGN);
311: pid = fork();
312: if (pid == -1) {
313: perror("fork");
314: exit(1);
315: }
316: if (pid) {
317: int wpid, status;
318:
319: /*
320: * We are the parent. If the kid has problems,
321: * cleanup the spool directory.
322: */
323: wpid = wait(&status);
324: if (wpid != pid || status) {
325: cleanup();
326: exit(1);
327: }
328: /*
329: * The kid should have alread flushed the buffers.
330: */
331: _exit(0);
332: }
333:
334: /*
335: * Exit on interrupt.
336: */
337: signal(SIGINT, SIG_DFL);
338:
339: /*
340: * We are the kid, give up special permissions.
341: */
342: setuid(getuid());
343:
344: /*
345: * Open the input file with the user's permissions.
346: */
347: if (!standardin) {
348: jobfile = *argv;
349: if ((inputfile = fopen(jobfile, "r")) == NULL) {
350: perror(jobfile);
351: exit(1);
352: }
353: }
354:
355: /*
356: * Determine what shell we should use to run the job. If the user
357: * didn't explicitly request that his/her current shell be over-
358: * ridden (shflag of cshflag) then we use the current shell.
359: */
360: if ((!shflag) && (!cshflag) && (getenv("SHELL") != NULL))
361: shell = "$SHELL";
362:
363: /*
364: * Put some standard information at the top of the spoolfile.
365: * This info is used by the other "at"-oriented programs (atq,
366: * atrm, atrun).
367: */
368: fprintf(spoolfile, "# owner: %.127s\n",getname(getuid()));
369: fprintf(spoolfile, "# jobname: %.127s\n",jobfile);
370: fprintf(spoolfile, "# shell: sh\n");
371: fprintf(spoolfile, "# notify by mail: %s\n",(mailflag) ? "yes" : "no");
372: fprintf(spoolfile, "\n");
373:
374: /*
375: * Set the modes for any files created by the job being run.
376: */
377: c = umask(0);
378: umask(c);
379: fprintf(spoolfile, "umask %.1o\n", c);
380:
381: /*
382: * Get the current working directory so we know what directory to
383: * run the job from.
384: */
385: if (getwd(pwbuf) == NULL) {
386: fprintf(stderr, "at: can't get working directory\n");
387: exit(1);
388: }
389: fprintf(spoolfile, "cd %s\n", pwbuf);
390:
391: /*
392: * Copy the user's environment to the spoolfile.
393: */
394: if (environ) {
395: copyenvironment(&spoolfile);
396: }
397:
398: /*
399: * Put in a line to run the proper shell using the rest of
400: * the file as input. Note that 'exec'ing the shell will
401: * cause sh() to leave a /tmp/sh### file around. This line
402: * depends on the shells allowing EOF to end tagged input. The
403: * quotes also guarantee a quoting of the lines before EOF.
404: */
405: fprintf(spoolfile, "%s << 'QAZWSXEDCRFVTGBYHNUJMIKOLP'\n", shell);
406:
407: /*
408: * Now that we have all the files set up, we can start reading in
409: * the job.
410: */
411: while (fgets(line, LINSIZ, inputfile) != NULL)
412: fputs(line, spoolfile);
413:
414: /*
415: * Close all files and change the mode of the spoolfile.
416: */
417: fclose(inputfile);
418: fclose(spoolfile);
419:
420: exit(0);
421:
422: }
423:
424: /*
425: * Copy the user's environment to the spoolfile in the syntax of the
426: * Bourne shell. After the environment is set up, the proper shell
427: * will be invoked.
428: */
429: copyenvironment(spoolfile)
430: FILE **spoolfile;
431: {
432: char *tmp; /* scratch pointer */
433: char **environptr = environ; /* pointer to an environment setting */
434:
435: while(*environptr) {
436: tmp = *environptr;
437:
438: /*
439: * We don't want the termcap or terminal entry so skip them.
440: */
441: if ((strncmp(tmp,"TERM=",5) == 0) ||
442: (strncmp(tmp,"TERMCAP=",8) == 0)) {
443: ++environptr;
444: continue;
445: }
446:
447: /*
448: * Set up the proper syntax.
449: */
450: while (*tmp != '=')
451: fputc(*tmp++,*spoolfile);
452: fputc('=', *spoolfile);
453: fputc('\'' , *spoolfile);
454: ++tmp;
455:
456: /*
457: * Now copy the entry.
458: */
459: while (*tmp) {
460: if (*tmp == '\'')
461: fputs("'\\''", *spoolfile);
462: else if (*tmp == '\n')
463: fputs("\\",*spoolfile);
464: else
465: fputc(*tmp, *spoolfile);
466: ++tmp;
467: }
468: fputc('\'' , *spoolfile);
469:
470: /*
471: * We need to "export" environment settings.
472: */
473: fprintf(*spoolfile, "\nexport ");
474: tmp = *environptr;
475: while (*tmp != '=')
476: fputc(*tmp++,*spoolfile);
477: fputc('\n',*spoolfile);
478: ++environptr;
479: }
480: return;
481: }
482:
483: /*
484: * Create the filename for the spoolfile. The format is "yy.ddd.mmmm.??"
485: * where "yy" is the year the job will be run, "ddd" the day of year,
486: * "mmmm" the hour and minute, and "??" a scratch value used to dis-
487: * tinguish between two files that are to be run at the same time.
488: */
489: makeatfile(atfile,year,dayofyear,hour,minute)
490: int year;
491: int hour;
492: int minute;
493: int dayofyear;
494: char *atfile;
495: {
496: int i; /* scratch variable */
497:
498: for (i=0; ; i += 53) {
499: sprintf(atfile, "%s/%02d.%03d.%02d%02d.%02d", ATDIR, year,
500: dayofyear, hour, minute, (getpid() + i) % 100);
501:
502: /*
503: * Make sure that the file name that we've created is unique.
504: */
505: if (access(atfile, F_OK) == -1)
506: return;
507: }
508: }
509:
510: /*
511: * Has the requested time already passed for the currrent day? If so, we
512: * will run the job "tomorrow".
513: */
514: istomorrow()
515: {
516: if (attime.hour < nowtime.hour)
517: return(1);
518: if ((attime.hour == nowtime.hour) && (attime.min < nowtime.min))
519: return(1);
520:
521: return(0);
522: }
523:
524: /*
525: * Debugging wreckage.
526: */
527: printit()
528: {
529: printf("YEAR\tnowtime: %d\tattime: %d\n",nowtime.year,attime.year);
530: printf("YDAY\tnowtime: %d\tattime: %d\n",nowtime.yday,attime.yday);
531: printf("MON\tnowtime: %d\tattime: %d\n",nowtime.mon,attime.mon);
532: printf("MONDAY\tnowtime: %d\tattime: %d\n",nowtime.mday,attime.mday);
533: printf("WDAY\tnowtime: %d\tattime: %d\n",nowtime.wday,attime.wday);
534: printf("HOUR\tnowtime: %d\tattime: %d\n",nowtime.hour,attime.hour);
535: printf("MIN\tnowtime: %d\tattime: %d\n",nowtime.min,attime.min);
536: }
537:
538: /*
539: * Calculate the day of year that the job will be executed.
540: * The av,ac arguments are ptrs to argv,argc; updated as necessary.
541: */
542: makedayofyear(dateindex, av, ac)
543: int dateindex;
544: char ***av;
545: int *ac;
546: {
547: char **argv = *av; /* imitate argc,argv and update args at end */
548: int argc = *ac;
549: char *ptr; /* scratch pointer */
550: struct datetypes *daterequested; /* pointer to information about
551: the type of date option
552: we're dealing with */
553:
554: daterequested = &dates_info[dateindex];
555:
556: /*
557: * If we're dealing with a day of week, determine the number of days
558: * in the future the next day of this type will fall on. Add this
559: * value to "attime.yday".
560: */
561: if (daterequested->type == DAY) {
562: if (attime.wday < dateindex)
563: attime.yday += dateindex - attime.wday;
564: else if(attime.wday > dateindex)
565: attime.yday += (7 - attime.wday) + dateindex;
566: else attime.yday += 7;
567: }
568:
569: /*
570: * If we're dealing with a month and day of month, determine the
571: * day of year that this date will fall on.
572: */
573: if (daterequested->type == MONTH) {
574:
575: /*
576: * If a day of month isn't specified, print a message
577: * and exit.
578: */
579: if (argc <= 0) {
580: fprintf(stderr,"day of month not specified.\n");
581: exit(1);
582: }
583:
584: /*
585: * Scan the day of month value and make sure that it
586: * has no characters in it. If characters are found or
587: * the day requested is zero, print a message and exit.
588: */
589: ptr = *argv;
590: while (isdigit(*ptr))
591: ++ptr;
592: if ((*ptr != '\0') || (atoi(*argv) == 0)) {
593: fprintf(stderr,"\"%s\": illegal day of month\n",*argv);
594: exit(1);
595: }
596:
597: /*
598: * Set the month of year and day of month values. Since
599: * the first 7 values in our dateinfo table do not deal
600: * with month names, we subtract 7 from the month of year
601: * value.
602: */
603: attime.mon = (dateindex - 7);
604: attime.mday = (atoi(*argv) - 1);
605:
606: /*
607: * Test the day of month value to make sure that the
608: * value is legal.
609: */
610: if ((attime.mday + 1) >
611: yeartable[isleap(attime.year)][attime.mon + 1]) {
612: fprintf(stderr,"\"%s\": illegal day of month\n",*argv);
613: exit(1);
614: }
615:
616: /*
617: * Finally, we determine the day of year.
618: */
619: attime.yday = (countdays());
620: ++argv; --argc;
621: }
622:
623: /*
624: * If 'week' is specified, add 7 to the day of year.
625: */
626: if ((argc > 0) && (strcmp(*argv,"week") == 0)) {
627: attime.yday += 7;
628: ++argv; --argc;
629: }
630:
631: /*
632: * Now that all that is done, see if the requested execution time
633: * has already passed for this year, and if it has, set execution
634: * for next year.
635: */
636: if (isnextyear())
637: ++attime.year;
638:
639: /*
640: * Finally, reflect the updated argc,argv to the caller
641: */
642: *av = argv;
643: *ac = argc;
644: }
645:
646: /*
647: * Should the job be run next year? We check for the following situations:
648: *
649: * 1) the requested time has already passed for the current year.
650: * 2) the day of year is greater than the number of days in the year.
651: *
652: * If either of these tests succeed, we increment "attime.year" by 1.
653: * If #2 is true, we also subtract the number of days in the current year
654: * from "attime.yday". #2 can only occur if someone specifies a job to
655: * be run "tomorrow" on Dec. 31 or if they specify a job to be run a
656: * 'week' later and the date is at least Dec. 24. (I think so anyway)
657: */
658: isnextyear()
659: { register daysinyear;
660: if (attime.yday < nowtime.yday)
661: return(1);
662:
663: if ((attime.yday == nowtime.yday) && (attime.hour < nowtime.hour))
664: return(1);
665:
666: daysinyear = isleap(attime.year) ? 366 : 365;
667: if (attime.yday >= daysinyear) {
668: attime.yday -= daysinyear;
669: return(1);
670: }
671: if (attime.yday > (isleap(attime.year) ? 366 : 365)) {
672: attime.yday -= (isleap(attime.year) ? 366 : 365);
673: return(1);
674: }
675:
676: return(0);
677: }
678:
679: /*
680: * Determine the day of year given a month and day of month value.
681: */
682: countdays()
683: {
684: int leap; /* are we dealing with a leap year? */
685: int dayofyear; /* the day of year after conversion */
686: int monthofyear; /* the month of year that we are
687: dealing with */
688:
689: /*
690: * Are we dealing with a leap year?
691: */
692: leap = isleap(attime.year);
693:
694: monthofyear = attime.mon;
695: dayofyear = attime.mday;
696:
697: /*
698: * Determine the day of year.
699: */
700: while (monthofyear > 0)
701: dayofyear += yeartable[leap][monthofyear--];
702:
703: return(dayofyear);
704: }
705:
706: /*
707: * Is a year a leap year?
708: */
709: isleap(year)
710: int year;
711:
712: {
713: return((year%4 == 0 && year%100 != 0) || year%100 == 0);
714: }
715:
716: getdateindex(date)
717: char *date;
718: {
719: int i = 0;
720: struct datetypes *ptr;
721:
722: ptr = dates_info;
723:
724: for (ptr = dates_info; ptr->type != 0; ptr++, i++) {
725: if (isprefix(date, ptr->name))
726: return(i);
727: }
728: return(NODATEFOUND);
729: }
730:
731: isprefix(prefix, fullname)
732: char *prefix, *fullname;
733: {
734: char ch;
735: char *ptr;
736: char *ptr1;
737:
738: ptr = prefix;
739: ptr1 = fullname;
740:
741: while (*ptr) {
742: ch = *ptr;
743: if (isupper(ch))
744: ch = tolower(ch);
745:
746: if (ch != *ptr1++)
747: return(0);
748:
749: ++ptr;
750: }
751: return(1);
752: }
753:
754: getnowtime(nowtime, attime)
755: struct times *nowtime;
756: struct times *attime;
757: {
758: struct tm *now;
759: struct timeval time;
760: struct timezone zone;
761:
762: if (gettimeofday(&time,&zone) < 0) {
763: perror("gettimeofday");
764: exit(1);
765: }
766: now = localtime(&time.tv_sec);
767:
768: attime->year = nowtime->year = now->tm_year;
769: attime->yday = nowtime->yday = now->tm_yday;
770: attime->mon = nowtime->mon = now->tm_mon;
771: attime->mday = nowtime->mday = now->tm_mday;
772: attime->wday = nowtime->wday = now->tm_wday;
773: attime->hour = nowtime->hour = now->tm_hour;
774: attime->min = nowtime->min = now->tm_min;
775: }
776:
777: /*
778: * This is the same routine used in the old "at", so I won't bother
779: * commenting it. It'll give you an idea of what the code looked
780: * like when I got it.
781: */
782: maketime(attime,ptr)
783: char *ptr;
784: struct times *attime;
785: {
786: int val;
787: char *p;
788:
789: p = ptr;
790: val = 0;
791: while(isdigit(*p)) {
792: val = val*10+(*p++ -'0');
793: }
794: if (p-ptr < 3)
795: val *= HOUR;
796:
797: for (;;) {
798: switch(*p) {
799:
800: case ':':
801: ++p;
802: if (isdigit(*p)) {
803: if (isdigit(p[1])) {
804: val +=(10* *p + p[1] - 11*'0');
805: p += 2;
806: continue;
807: }
808: }
809: fprintf(stderr, "bad time format:\n");
810: exit(1);
811:
812: case 'A':
813: case 'a':
814: if (val >= HALFDAY+HOUR)
815: val = FULLDAY+1; /* illegal */
816: if (val >= HALFDAY && val <(HALFDAY+HOUR))
817: val -= HALFDAY;
818: break;
819:
820: case 'P':
821: case 'p':
822: if (val >= HALFDAY+HOUR)
823: val = FULLDAY+1; /* illegal */
824: if (val < HALFDAY)
825: val += HALFDAY;
826: break;
827:
828: case 'n':
829: case 'N':
830: if ((val == 0) || (val == HALFDAY))
831: val = HALFDAY;
832: else
833: val = FULLDAY+1; /* illegal */
834: break;
835:
836: case 'M':
837: case 'm':
838: if ((val == 0) || (val == HALFDAY))
839: val = 0;
840: else
841: val = FULLDAY+1; /* illegal */
842: break;
843:
844:
845: case '\0':
846: case ' ':
847: /* 24 hour time */
848: if (val == FULLDAY)
849: val -= FULLDAY;
850: break;
851:
852: default:
853: fprintf(stderr, "bad time format\n");
854: exit(1);
855:
856: }
857: break;
858: }
859: if (val < 0 || val >= FULLDAY) {
860: fprintf(stderr, "time out of range\n");
861: exit(1);
862: }
863: if (val%HOUR >= 60) {
864: fprintf(stderr, "illegal minute field\n");
865: exit(1);
866: }
867: attime->hour = val/HOUR;
868: attime->min = val%HOUR;
869: }
870:
871: /*
872: * Get the full login name of a person using his/her user id.
873: */
874: char *
875: getname(uid)
876: int uid;
877: {
878: struct passwd *pwdinfo; /* password info structure */
879: char *logname, *getlogin();
880:
881: logname = getlogin();
882: if (logname == NULL || (pwdinfo = getpwnam(logname)) == NULL ||
883: pwdinfo->pw_uid != uid)
884: pwdinfo = getpwuid(uid);
885: if (pwdinfo == 0) {
886: fprintf(stderr, "no name for uid %d?\n", uid);
887: exit(1);
888: }
889: return(pwdinfo->pw_name);
890: }
891:
892: /*
893: * Do general cleanup.
894: */
895: cleanup()
896: {
897: if (unlink(atfile) == -1)
898: perror(atfile);
899: exit(1);
900: }
901:
902: /*
903: * Print usage info and exit.
904: */
905: usage()
906: {
907: fprintf(stderr,"usage: at [-csm] time [date] [filename]\n");
908: exit(1);
909: }
910:
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