Initial revision

1 files changed, 214 insertions, 0 deletions

diff --git a/Src/Builtins/sched.c b/Src/Builtins/sched.c
new file mode 100644
index 000000000..b4914899e
--- /dev/null
+++ b/Src/Builtins/sched.c
@@ -0,0 +1,214 @@
+/*
+ * 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;
+    PERMALLOC {
+	sch->cmd = zjoin(argv, ' ');
+    } LASTALLOC;
+    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
+boot_sched(Module m)
+{
+    if(!addbuiltins(m->nam, bintab, sizeof(bintab)/sizeof(*bintab)))
+	return 1;
+    uaddlinknode(prepromptfns, &n_checksched);
+    return 0;
+}
+
+#ifdef MODULE
+
+/**/
+int
+cleanup_sched(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;
+}
+
+#endif