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170
study/linux-travel/MINIX-1.5/1.5/Source/commands/at.c
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170
study/linux-travel/MINIX-1.5/1.5/Source/commands/at.c
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/* at - run a command at a specified time Author: Jan Looyen */
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#include <sys/types.h>
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#include <time.h>
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#include <fcntl.h>
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#include <stdio.h>
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#define STARTDAY 0 /* see ctime(3) */
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#define LEAPDAY STARTDAY+59
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#define MAXDAYNR STARTDAY+365
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#define NODAY -2
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main(argc, argv, envp)
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int argc;
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char **argv, **envp;
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{
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int i, count, ltim, year, getltim(), getlday(), lday = NODAY;
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char c, buf[10], job[30], *dp, *sp;
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struct tm *p, *localtime();
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long clock;
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FILE *fp, *pin, *popen();
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/*-------------------------------------------------------------------------*
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* check arguments & pipe to "pwd" *
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*-------------------------------------------------------------------------*/
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if (argc < 2 || argc > 5) {
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fprintf(stderr, "Usage: %s time [month day] [file]\n", argv[0]);
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exit(1);
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}
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if ((ltim = getltim(argv[1])) == -1) {
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fprintf(stderr, "%s: wrong time specification\n", argv[0]);
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exit(1);
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}
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if ((argc == 4 || argc == 5) && (lday = getlday(argv[2], argv[3])) == -1) {
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fprintf(stderr, "%s: wrong date specification\n", argv[0]);
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exit(1);
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}
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if ((argc == 3 || argc == 5) && open(argv[argc - 1], O_RDONLY) == -1) {
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fprintf(stderr, "%s: cannot find: %s\n", argv[0], argv[argc - 1]);
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exit(1);
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}
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if ((pin = popen("pwd", "r")) == NULL) {
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fprintf(stderr, "%s: cannot open pipe to cmd 'pwd'\n", argv[0]);
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exit(1);
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}
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/*-------------------------------------------------------------------------*
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* determine execution time and create 'at' job file *
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*-------------------------------------------------------------------------*/
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time(&clock);
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p = localtime(&clock);
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year = p->tm_year;
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if (lday == NODAY) { /* no [month day] given */
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lday = p->tm_yday;
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if (ltim <= (p->tm_hour * 100 + p->tm_min)) {
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lday++;
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if (lday == MAXDAYNR && (year % 4) || lday == MAXDAYNR + 1) {
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lday = STARTDAY;
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year++;
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}
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}
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} else
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switch (year % 4) {
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case 0:
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if (lday < p->tm_yday || lday == p->tm_yday &&
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ltim <= (p->tm_hour * 100 + p->tm_min)) {
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year++;
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if (lday > LEAPDAY) lday--;
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}
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break;
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case 1:
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case 2:
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if (lday > LEAPDAY) lday--;
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if (lday < p->tm_yday || lday == p->tm_yday &&
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ltim <= (p->tm_hour * 100 + p->tm_min))
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year++;
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break;
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case 3:
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if (lday < ((lday > LEAPDAY) ? p->tm_yday + 1 : p->tm_yday) ||
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lday == ((lday > LEAPDAY) ? p->tm_yday + 1 : p->tm_yday) &&
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ltim <= (p->tm_hour * 100 + p->tm_min))
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year++;
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else if (lday > LEAPDAY)
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lday--;
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break;
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}
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sprintf(job, "/usr/spool/at/%02d.%03d.%04d.%02d",
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year % 100, lday, ltim, getpid() % 100);
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if ((fp = fopen(job, "w")) == NULL) {
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fprintf(stderr, "%s: cannot create %s\n", argv[0], job);
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exit(1);
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}
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/*-------------------------------------------------------------------------*
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* write environment and command(s) to 'at'job file *
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*-------------------------------------------------------------------------*/
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i = 0;
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while (envp[i] != NULL) {
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count = 1;
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dp = buf;
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sp = envp[i];
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while ((*dp++ = *sp++) != '=') count++;
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*--dp = '\0';
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fprintf(fp, "%s='%s'; export %s\n", buf, &envp[i++][count], buf);
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}
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fprintf(fp, "cd ");
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while ((c = getc(pin)) != EOF) putc(c, fp);
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fprintf(fp, "umask %o\n", umask());
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if (argc == 3 || argc == 5)
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fprintf(fp, "%s\n", argv[argc - 1]);
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else /* read from stdinput */
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while ((c = getchar()) != EOF) putc(c, fp);
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printf("%s: %s created\n", argv[0], job);
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exit(0);
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}
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/*-------------------------------------------------------------------------*
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* getltim() return((time OK) ? daytime : -1) *
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*-------------------------------------------------------------------------*/
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getltim(t)
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char *t;
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{
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if (t[4] == '\0' && t[3] >= '0' && t[3] <= '9' &&
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t[2] >= '0' && t[2] <= '5' && t[1] >= '0' && t[1] <= '9' &&
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(t[0] == '0' || t[0] == '1' || t[1] <= '3' && t[0] == '2'))
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return(atoi(t));
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else
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return(-1);
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}
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/*-------------------------------------------------------------------------*
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* getlday() return ((date OK) ? yearday : -1) *
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*-------------------------------------------------------------------------*/
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getlday(m, d)
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char *m, *d;
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{
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int i, month, day, im;
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static int cumday[] = {0, 0, 31, 60, 91, 121, 152,
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182, 213, 244, 274, 305, 335};
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static struct date {
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char *mon;
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int dcnt;
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} *pc,
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kal[] = {
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"Jan", 31, "Feb", 29, "Mar", 31, "Apr", 30,
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"May", 31, "Jun", 30, "Jul", 31, "Aug", 31,
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"Sep", 30, "Oct", 31, "Nov", 30, "Dec", 31
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};
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pc = kal;
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im = (digitstring(m)) ? atoi(m) : 0;
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m[0] &= 0337;
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for (i = 1; i < 13 && strcmp(m, pc->mon) && im != i; i++, pc++);
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if (i < 13 && (day = (digitstring(d)) ? atoi(d) : 0) && day <= pc->dcnt) {
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if (!STARTDAY) day--;
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return(day + cumday[i]);
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} else
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return(-1);
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}
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digitstring(s)
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char *s;
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{
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while (*s >= '0' && *s <= '9') s++;
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return((*s == '\0') ? 1 : 0);
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}
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