summary refs log tree commit diff
path: root/Src/Builtins/sched.c
blob: b6b00dff3e746afdc6a578691a7121a86761b6af (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
/*
 * sched.c - execute commands at scheduled times
 *
 * This file is part of zsh, the Z shell.
 *
 * Copyright (c) 1992-1997 Paul Falstad
 * All rights reserved.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and to distribute modified versions of this software for any
 * purpose, provided that the above copyright notice and the following
 * two paragraphs appear in all copies of this software.
 *
 * In no event shall Paul Falstad or the Zsh Development Group be liable
 * to any party for direct, indirect, special, incidental, or consequential
 * damages arising out of the use of this software and its documentation,
 * even if Paul Falstad and the Zsh Development Group have been advised of
 * the possibility of such damage.
 *
 * Paul Falstad and the Zsh Development Group specifically disclaim any
 * warranties, including, but not limited to, the implied warranties of
 * merchantability and fitness for a particular purpose.  The software
 * provided hereunder is on an "as is" basis, and Paul Falstad and the
 * Zsh Development Group have no obligation to provide maintenance,
 * support, updates, enhancements, or modifications.
 *
 */

#include "sched.mdh"
#include "sched.pro"

/* node in sched list */

typedef struct schedcmd  *Schedcmd;

/* Flags for each scheduled event */
enum schedflags {
    /* Trash zle if necessary when event is activated */
    SCHEDFLAG_TRASH_ZLE = 1
};

struct schedcmd {
    struct schedcmd *next;
    char *cmd;			/* command to run */
    time_t time;		/* when to run it */
    int flags;			/* flags as above */
};

/* the list of sched jobs pending */

static struct schedcmd *schedcmds;

/* flag that timed event is running (via addtimedfn())*/
static int schedcmdtimed;

/* Use addtimedfn() to add a timed event for sched's use */

/**/
static void
schedaddtimed(time_t t)
{
    /*
     * The following code shouldn't be necessary and indicates
     * a bug.  However, the DPUTS() in the caller should pick
     * this up so we can detect and fix it, and the following
     * Makes The World Safe For Timed Events in non-debugging shells.
     */
    if (schedcmdtimed)
	scheddeltimed();
    schedcmdtimed = 1;
    addtimedfn(checksched, schedcmds->time);
}

/* Use deltimedfn() to remove the sched timed event */

/**/
static void
scheddeltimed(void)
{
    deltimedfn(checksched);
    schedcmdtimed = 0;
}


/* Check scheduled commands; call this function from time to time. */

/**/
static void
checksched(void)
{
    time_t t;
    struct schedcmd *sch;

    if(!schedcmds)
	return;
    t = time(NULL);
    /*
     * List is ordered, so we only need to consider the
     * head element.
     */
    while (schedcmds && schedcmds->time <= t) {
	/*
	 * Remove the entry to be executed from the list
	 * before execution:  this makes quite sure that
	 * the entry hasn't been monkeyed with when we
	 * free it.
	 */
	sch = schedcmds;
	schedcmds = sch->next;
	/*
	 * Delete from the timed function list now in case
	 * the called code reschedules.
	 */
	scheddeltimed();

	if ((sch->flags & SCHEDFLAG_TRASH_ZLE) && zleactive)
	    trashzleptr();
	execstring(sch->cmd, 0, 0);
	zsfree(sch->cmd);
	zfree(sch, sizeof(struct schedcmd));

	/*
	 * Fix time for future events.
	 * I had this outside the loop, for a little extra efficiency.
	 * However, it then occurred to me that having the list of
	 * forthcoming entries up to date could be regarded as
	 * a feature, and the inefficiency is negligible.
	 *
	 * Careful in case the code we called has already set
	 * up a timed event; if it has, that'll be up to date since
	 * we haven't changed the list here.
	 */
	if (schedcmds && !schedcmdtimed) {
	    /*
	     * We've already delete the function from the list.
	     */
	    DPUTS(timedfns && firstnode(timedfns),
		  "BUG: already timed fn (1)");
	    schedaddtimed(schedcmds->time);
	}
    }
}

/**/
static int
bin_sched(char *nam, char **argv, UNUSED(Options ops), UNUSED(int func))
{
    char *s, **argptr;
    time_t t;
    long h, m, sec;
    struct tm *tm;
    struct schedcmd *sch, *sch2, *schl;
    int sn, flags = 0;

    /* If the argument begins with a -, remove the specified item from the
    schedule. */
    for (argptr = argv; *argptr && **argptr == '-'; argptr++) {
	char *arg = *argptr + 1;
	if (idigit(*arg)) {
	    sn = atoi(arg);

	    if (!sn) {
		zwarnnam("sched", "usage for delete: sched -<item#>.");
		return 1;
	    }
	    for (schl = NULL, sch = schedcmds, sn--;
		 sch && sn; sch = (schl = sch)->next, sn--);
	    if (!sch) {
		zwarnnam("sched", "not that many entries");
		return 1;
	    }
	    if (schl)
		schl->next = sch->next;
	    else {
		scheddeltimed();
		schedcmds = sch->next;
		if (schedcmds) {
		    DPUTS(timedfns && firstnode(timedfns), "BUG: already timed fn (2)");
		    schedaddtimed(schedcmds->time);
		}
	    }
	    zsfree(sch->cmd);
	    zfree(sch, sizeof(struct schedcmd));

	    return 0;
	} else if (*arg == '-') {
	    /* end of options */
	    argptr++;
	    break;
	} else if (!strcmp(arg, "o")) {
	    flags |= SCHEDFLAG_TRASH_ZLE;
	} else {
	    if (*arg)
		zwarnnam(nam, "bad option: -%c", *arg);
	    else
		zwarnnam(nam, "option expected");
	    return 1;
	}
    }

    /* given no arguments, display the schedule list */
    if (!*argptr) {
	char tbuf[40], *flagstr, *endstr;

	for (sn = 1, sch = schedcmds; sch; sch = sch->next, sn++) {
	    t = sch->time;
	    tm = localtime(&t);
	    ztrftime(tbuf, 20, "%a %b %e %k:%M:%S", tm);
	    if (sch->flags & SCHEDFLAG_TRASH_ZLE)
		flagstr = "-o ";
	    else
		flagstr = "";
	    if (*sch->cmd == '-')
		endstr = "-- ";
	    else
		endstr = "";
	    printf("%3d %s %s%s%s\n", sn, tbuf, flagstr, endstr, sch->cmd);
	}
	return 0;
    } else if (!argptr[1]) {
	/* other than the two cases above, sched *
	 *requires at least two arguments        */
	zwarnnam("sched", "not enough arguments");
	return 1;
    }

    /* The first argument specifies the time to schedule the command for.  The
    remaining arguments form the command. */
    s = *argptr++;
    if (*s == '+') {
	/*
	 * + introduces a relative time.  The rest of the argument may be an
	 * hour:minute offset from the current time.  Once the hour and minute
	 * numbers have been extracted, and the format verified, the resulting
	 * offset is simply added to the current time.
	 */
	zlong zl = zstrtol(s + 1, &s, 10);
	if (*s == ':') {
	    m = (long)zstrtol(s + 1, &s, 10);
	    if (*s == ':')
		sec = (long)zstrtol(s + 1, &s, 10);
	    else
		sec = 0;
	    if (*s) {
		zwarnnam("sched", "bad time specifier");
		return 1;
	    }
	    t = time(NULL) + (long)zl * 3600 + m * 60 + sec;
	} else if (!*s) {
	    /*
	     * Alternatively, it may simply be a number of seconds.
	     * This is here for consistency with absolute times.
	     */
	    t = time(NULL) + (time_t)zl;
	} else {
	    zwarnnam("sched", "bad time specifier");
	    return 1;
	}
    } else {
	/*
	 * If there is no +, an absolute time must have been given.
	 * This may be in hour:minute format, optionally followed by a string
	 * starting with `a' or `p' (for a.m. or p.m.).  Characters after the
	 * `a' or `p' are ignored.
	 */
	zlong zl = zstrtol(s, &s, 10);
	if (*s == ':') {
	    h = (long)zl;
	    m = (long)zstrtol(s + 1, &s, 10);
	    if (*s == ':')
		sec = (long)zstrtol(s + 1, &s, 10);
	    else
		sec = 0;
	    if (*s && *s != 'a' && *s != 'A' && *s != 'p' && *s != 'P') {
		zwarnnam("sched", "bad time specifier");
		return 1;
	    }
	    t = time(NULL);
	    tm = localtime(&t);
	    t -= tm->tm_sec + tm->tm_min * 60 + tm->tm_hour * 3600;
	    if (*s == 'p' || *s == 'P')
		h += 12;
	    t += h * 3600 + m * 60 + sec;
	    /*
	     * If the specified time is before the current time, it must refer
	     * to tomorrow.
	     */
	    if (t < time(NULL))
		t += 3600 * 24;
	} else if (!*s) {
	    /*
	     * Otherwise, it must be a raw time specifier.
	     */
	    t = (long)zl;
	} else {
	    zwarnnam("sched", "bad time specifier");
	    return 1;
	}
    }
    /* The time has been calculated; now add the new entry to the linked list
    of scheduled commands. */
    sch = (struct schedcmd *) zalloc(sizeof *sch);
    sch->time = t;
    sch->cmd = zjoin(argptr, ' ', 0);
    sch->flags = flags;
    /* Insert into list in time order */
    if (schedcmds) {
	if (sch->time < schedcmds->time) {
	    scheddeltimed();
	    sch->next = schedcmds;
	    schedcmds = sch;
	    DPUTS(timedfns && firstnode(timedfns), "BUG: already timed fn (3)");
	    schedaddtimed(t);
	} else {
	    for (sch2 = schedcmds;
		 sch2->next && sch2->next->time < sch->time;
		 sch2 = sch2->next)
		;
	    sch->next = sch2->next;
	    sch2->next = sch;
	}
    } else {
	sch->next = NULL;
	schedcmds = sch;
	DPUTS(timedfns && firstnode(timedfns), "BUG: already timed fn (4)");
	schedaddtimed(t);
    }
    return 0;
}

static struct builtin bintab[] = {
    BUILTIN("sched", 0, bin_sched, 0, -1, 0, NULL, NULL),
};

static struct features module_features = {
    bintab, sizeof(bintab)/sizeof(*bintab),
    NULL, 0,
    NULL, 0,
    NULL, 0,
    0
};

/**/
int
setup_(UNUSED(Module m))
{
    return 0;
}

/**/
int
features_(Module m, char ***features)
{
    *features = featuresarray(m->nam, &module_features);
    return 0;
}

/**/
int
enables_(Module m, int **enables)
{
    return handlefeatures(m->nam, &module_features, enables);
}

/**/
int
boot_(Module m)
{
    addprepromptfn(&checksched);
    return 0;
}

/**/
int
cleanup_(Module m)
{
    struct schedcmd *sch, *schn;

    if (schedcmds)
	scheddeltimed();
    for (sch = schedcmds; sch; sch = schn) {
	schn = sch->next;
	zsfree(sch->cmd);
	zfree(sch, sizeof(*sch));
    }
    delprepromptfn(&checksched);
    return setfeatureenables(m->nam, &module_features, NULL);
}

/**/
int
finish_(UNUSED(Module m))
{
    return 0;
}