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at.c
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C/C++ Source or Header
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1990-07-15
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5KB
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171 lines
/* at - run a command at a specified time Author: Jan Looyen */
#include <sys/types.h>
#include <time.h>
#include <fcntl.h>
#include <stdio.h>
#define STARTDAY 0 /* see ctime(3) */
#define LEAPDAY STARTDAY+59
#define MAXDAYNR STARTDAY+365
#define NODAY -2
main(argc, argv, envp)
int argc;
char **argv, **envp;
{
int i, count, ltim, year, getltim(), getlday(), lday = NODAY;
char c, buf[10], job[30], *dp, *sp;
struct tm *p, *localtime();
long clock;
FILE *fp, *pin, *popen();
/*-------------------------------------------------------------------------*
* check arguments & pipe to "pwd" *
*-------------------------------------------------------------------------*/
if (argc < 2 || argc > 5) {
fprintf(stderr, "Usage: %s time [month day] [file]\n", argv[0]);
exit(1);
}
if ((ltim = getltim(argv[1])) == -1) {
fprintf(stderr, "%s: wrong time specification\n", argv[0]);
exit(1);
}
if ((argc == 4 || argc == 5) && (lday = getlday(argv[2], argv[3])) == -1) {
fprintf(stderr, "%s: wrong date specification\n", argv[0]);
exit(1);
}
if ((argc == 3 || argc == 5) && open(argv[argc - 1], O_RDONLY) == -1) {
fprintf(stderr, "%s: cannot find: %s\n", argv[0], argv[argc - 1]);
exit(1);
}
if ((pin = popen("pwd", "r")) == NULL) {
fprintf(stderr, "%s: cannot open pipe to cmd 'pwd'\n", argv[0]);
exit(1);
}
/*-------------------------------------------------------------------------*
* determine execution time and create 'at' job file *
*-------------------------------------------------------------------------*/
time(&clock);
p = localtime(&clock);
year = p->tm_year;
if (lday == NODAY) { /* no [month day] given */
lday = p->tm_yday;
if (ltim <= (p->tm_hour * 100 + p->tm_min)) {
lday++;
if (lday == MAXDAYNR && (year % 4) || lday == MAXDAYNR + 1) {
lday = STARTDAY;
year++;
}
}
} else
switch (year % 4) {
case 0:
if (lday < p->tm_yday || lday == p->tm_yday &&
ltim <= (p->tm_hour * 100 + p->tm_min)) {
year++;
if (lday > LEAPDAY) lday--;
}
break;
case 1:
case 2:
if (lday > LEAPDAY) lday--;
if (lday < p->tm_yday || lday == p->tm_yday &&
ltim <= (p->tm_hour * 100 + p->tm_min))
year++;
break;
case 3:
if (lday < ((lday > LEAPDAY) ? p->tm_yday + 1 : p->tm_yday) ||
lday == ((lday > LEAPDAY) ? p->tm_yday + 1 : p->tm_yday) &&
ltim <= (p->tm_hour * 100 + p->tm_min))
year++;
else if (lday > LEAPDAY)
lday--;
break;
}
sprintf(job, "/usr/spool/at/%02d.%03d.%04d.%02d",
year % 100, lday, ltim, getpid() % 100);
if ((fp = fopen(job, "w")) == NULL) {
fprintf(stderr, "%s: cannot create %s\n", argv[0], job);
exit(1);
}
/*-------------------------------------------------------------------------*
* write environment and command(s) to 'at'job file *
*-------------------------------------------------------------------------*/
i = 0;
while (envp[i] != NULL) {
count = 1;
dp = buf;
sp = envp[i];
while ((*dp++ = *sp++) != '=') count++;
*--dp = '\0';
fprintf(fp, "%s='%s'; export %s\n", buf, &envp[i++][count], buf);
}
fprintf(fp, "cd ");
while ((c = getc(pin)) != EOF) putc(c, fp);
fprintf(fp, "umask %o\n", umask());
if (argc == 3 || argc == 5)
fprintf(fp, "%s\n", argv[argc - 1]);
else /* read from stdinput */
while ((c = getchar()) != EOF) putc(c, fp);
printf("%s: %s created\n", argv[0], job);
exit(0);
}
/*-------------------------------------------------------------------------*
* getltim() return((time OK) ? daytime : -1) *
*-------------------------------------------------------------------------*/
getltim(t)
char *t;
{
if (t[4] == '\0' && t[3] >= '0' && t[3] <= '9' &&
t[2] >= '0' && t[2] <= '5' && t[1] >= '0' && t[1] <= '9' &&
(t[0] == '0' || t[0] == '1' || t[1] <= '3' && t[0] == '2'))
return(atoi(t));
else
return(-1);
}
/*-------------------------------------------------------------------------*
* getlday() return ((date OK) ? yearday : -1) *
*-------------------------------------------------------------------------*/
getlday(m, d)
char *m, *d;
{
int i, month, day, im;
static int cumday[] = {0, 0, 31, 60, 91, 121, 152,
182, 213, 244, 274, 305, 335};
static struct date {
char *mon;
int dcnt;
} *pc,
kal[] = {
"Jan", 31, "Feb", 29, "Mar", 31, "Apr", 30,
"May", 31, "Jun", 30, "Jul", 31, "Aug", 31,
"Sep", 30, "Oct", 31, "Nov", 30, "Dec", 31
};
pc = kal;
im = (digitstring(m)) ? atoi(m) : 0;
m[0] &= 0337;
for (i = 1; i < 13 && strcmp(m, pc->mon) && im != i; i++, pc++);
if (i < 13 && (day = (digitstring(d)) ? atoi(d) : 0) && day <= pc->dcnt) {
if (!STARTDAY) day--;
return(day + cumday[i]);
} else
return(-1);
}
digitstring(s)
char *s;
{
while (*s >= '0' && *s <= '9') s++;
return((*s == '\0') ? 1 : 0);
}