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84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/* Alarm v1.0. Copyright 1994 by Christopher Neufeld */
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#include <stdio.h>
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#include <gno/gno.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <time.h>
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#include <ctype.h>
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#pragma stacksize 512
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#define BEEP putchar((char)0x07)
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#define TBEEPS 2 /* Time between beeps in seconds */
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#define MAXBEEPS 5
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#define SECSPERDAY (60 * 60 * 24)
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#define DIGTOI(x) ((int) ((x) - '0'))
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void usage(char *exename)
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{
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fprintf(stderr, "Alarm program. Copyright 1994 by Christopher Neufeld\n");
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fprintf(stderr, "Usage: %s [+]#### [<delay> [\"<message>\"]]\n", exename);
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fprintf(stderr, "Where #### is a time in hhmm format, ie. 0010 is ten past midnight\n");
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fprintf(stderr, " +#### indicates that number of hhmm after the current time.\n");
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fprintf(stderr, " delay is the time delay between beeps or messages, if any.\n");
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fprintf(stderr, " message is delivered to stdout at alarm condition\n\n");
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fprintf(stderr, "This executable contains linked runtime libraries copyrighted\n");
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fprintf(stderr, "by The Byte Works. Used with Permission.\n\n");
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exit(1);
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}
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int main(int argc, char **argv)
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{
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char *ptr1, *tptr, *msg;
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static struct tm timenow, timethen;
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static time_t curtime, alarmtime;
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static int i, mins, hrs, offset, message, deltat;
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unsigned long initwait;
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message = 0;
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deltat = TBEEPS;
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if (argc < 2 || argc > 4) usage(argv[0]);
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if (argc > 2) {
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deltat = (int) strtoul(argv[2], &ptr1, 0);
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if (*ptr1 != 0) usage(argv[0]); /* Unable to parse delay time */
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if (argc == 4) {
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msg = argv[3];
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message = 1;
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}
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}
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tptr = argv[1] + (offset = (argv[1][0] == '+'));
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if (strlen(tptr) != 4) usage(argv[0]);
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for (i=0;i<4;i++)
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if (!isdigit(tptr[i])) usage(argv[0]);
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hrs = 10 * DIGTOI(tptr[0]) + DIGTOI(tptr[1]);
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mins = atoi(tptr + 2);
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if (mins > 59) {
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if (offset) hrs++;
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else usage(argv[0]);
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}
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if (hrs > 23 && !offset) usage(argv[0]);
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if (!offset) {
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curtime = time(NULL);
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timethen = *localtime(&curtime);
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timethen.tm_sec = 0;
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timethen.tm_min = mins;
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timethen.tm_hour = hrs;
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alarmtime = mktime(&timethen);
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initwait = difftime(alarmtime, curtime);
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if (initwait <= 0) initwait += SECSPERDAY;
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} else initwait = 60 * (mins + 60 * hrs);
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sleep(initwait);
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for (i=0;i<MAXBEEPS;i++) {
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BEEP;
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fflush(stdout);
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if (message) printf("%s\n", msg);
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sleep(deltat);
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}
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exit(0);
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}
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