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/*
* 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;
struct schedcmd {
struct schedcmd *next;
char *cmd; /* command to run */
time_t time; /* when to run it */
};
/* the list of sched jobs pending */
static struct schedcmd *schedcmds;
/**/
static int
bin_sched(char *nam, char **argv, char *ops, int func)
{
char *s = *argv++;
time_t t;
long h, m;
struct tm *tm;
struct schedcmd *sch, *sch2, *schl;
int sn;
/* If the argument begins with a -, remove the specified item from the
schedule. */
if (s && *s == '-') {
sn = atoi(s + 1);
if (!sn) {
zwarnnam("sched", "usage for delete: sched -<item#>.", NULL, 0);
return 1;
}
for (schl = (struct schedcmd *)&schedcmds, sch = schedcmds, sn--;
sch && sn; sch = (schl = sch)->next, sn--);
if (!sch) {
zwarnnam("sched", "not that many entries", NULL, 0);
return 1;
}
schl->next = sch->next;
zsfree(sch->cmd);
zfree(sch, sizeof(struct schedcmd));
return 0;
}
/* given no arguments, display the schedule list */
if (!s) {
char tbuf[40];
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);
printf("%3d %s %s\n", sn, tbuf, sch->cmd);
}
return 0;
} else if (!*argv) {
/* other than the two cases above, sched *
*requires at least two arguments */
zwarnnam("sched", "not enough arguments", NULL, 0);
return 1;
}
/* The first argument specifies the time to schedule the command for. The
remaining arguments form the command. */
if (*s == '+') {
/* + introduces a relative time. The rest of the argument is 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. */
h = zstrtol(s + 1, &s, 10);
if (*s != ':') {
zwarnnam("sched", "bad time specifier", NULL, 0);
return 1;
}
m = zstrtol(s + 1, &s, 10);
if (*s) {
zwarnnam("sched", "bad time specifier", NULL, 0);
return 1;
}
t = time(NULL) + h * 3600 + m * 60;
} else {
/* If there is no +, an absolute time of day must have been given.
This is 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. */
h = zstrtol(s, &s, 10);
if (*s != ':') {
zwarnnam("sched", "bad time specifier", NULL, 0);
return 1;
}
m = zstrtol(s + 1, &s, 10);
if (*s && *s != 'a' && *s != 'A' && *s != 'p' && *s != 'P') {
zwarnnam("sched", "bad time specifier", NULL, 0);
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;
/* If the specified time is before the current time, it must refer to
tomorrow. */
if (t < time(NULL))
t += 3600 * 24;
}
/* The time has been calculated; now add the new entry to the linked list
of scheduled commands. */
sch = (struct schedcmd *) zcalloc(sizeof *sch);
sch->time = t;
sch->cmd = zjoin(argv, ' ', 0);
sch->next = NULL;
for (sch2 = (struct schedcmd *)&schedcmds; sch2->next; sch2 = sch2->next);
sch2->next = sch;
return 0;
}
/* Check scheduled commands; call this function from time to time. */
/**/
static void
checksched(void)
{
time_t t;
struct schedcmd *sch, *schl;
if(!schedcmds)
return;
t = time(NULL);
for (schl = (struct schedcmd *)&schedcmds, sch = schedcmds; sch;
sch = (schl = sch)->next) {
if (sch->time <= t) {
execstring(sch->cmd, 0, 0);
schl->next = sch->next;
zsfree(sch->cmd);
zfree(sch, sizeof(struct schedcmd));
sch = schl;
}
}
}
static void (*p_checksched) _((void)) = checksched;
static struct linknode n_checksched = { NULL, NULL, &p_checksched };
static struct builtin bintab[] = {
BUILTIN("sched", 0, bin_sched, 0, -1, 0, NULL, NULL),
};
/**/
int
setup_(Module m)
{
return 0;
}
/**/
int
boot_(Module m)
{
if(!addbuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab)))
return 1;
uaddlinknode(prepromptfns, &n_checksched);
return 0;
}
/**/
int
cleanup_(Module m)
{
struct schedcmd *sch, *schn;
for (sch = schedcmds; sch; sch = schn) {
schn = sch->next;
zsfree(sch->cmd);
zfree(sch, sizeof(*sch));
}
uremnode(prepromptfns, &n_checksched);
deletebuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab));
return 0;
}
/**/
int
finish_(Module m)
{
return 0;
}
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