113 lines
2.0 KiB
C
113 lines
2.0 KiB
C
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/* vim: tabstop=4 shiftwidth=4 noexpandtab
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2019 K. Lange
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*
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* cal - print a calendar
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*/
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/time.h>
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const char * month_names[] = {
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"January",
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"February",
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"March",
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"April",
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"May",
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"June",
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"July",
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"August",
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"September",
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"October",
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"November",
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"December",
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};
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int days_in_months[] = {
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31, 0, 31, 30, 31, 30, 31,
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31, 30, 31, 30, 31,
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};
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int main(int argc, char * argv[]) {
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if (argc > 1) {
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fprintf(stderr, "%s: arguments not currently supported\n", argv[0]);
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return 1;
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}
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struct timeval now;
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gettimeofday(&now, NULL);
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struct tm actual;
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struct tm * timeinfo;
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timeinfo = localtime((time_t *)&now.tv_sec);
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memcpy(&actual, timeinfo, sizeof(struct tm));
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timeinfo = &actual;
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char month[20];
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sprintf(month, "%s %d", month_names[timeinfo->tm_mon], timeinfo->tm_year + 1900);
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int len = (20 - strlen(month)) / 2;
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while (len > 0) {
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printf(" ");
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len--;
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}
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/* Heading */
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printf("%s\n", month);
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printf("Su Mo Tu We Th Fr Sa\n");
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/* Now's the fun part. */
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int days_in_month = days_in_months[timeinfo->tm_mon];
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if (days_in_month == 0) {
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/* How many days in February? */
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struct tm tmp;
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memcpy(&tmp, timeinfo, sizeof(struct tm));
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tmp.tm_mday = 29;
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tmp.tm_hour = 12;
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time_t tmp3 = mktime(&tmp);
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struct tm * tmp2 = localtime(&tmp3);
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if (tmp2->tm_mday == 29) {
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days_in_month = 29;
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} else {
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days_in_month = 28;
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}
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}
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int mday = timeinfo->tm_mday;
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int wday = timeinfo->tm_wday; /* 0 == sunday */
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while (mday > 1) {
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mday--;
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wday = (wday + 6) % 7;
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}
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for (int i = 0; i < wday; ++i) {
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printf(" ");
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}
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while (mday <= days_in_month) {
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if (mday == timeinfo->tm_mday) {
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printf("\033[7m%2d\033[0m ", mday);
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} else {
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printf("%2d ", mday);
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}
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if (wday == 6) {
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printf("\n");
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}
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mday += 1;
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wday = (wday + 1) % 7;
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}
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if (wday != 0) {
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printf("\n");
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}
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return 0;
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}
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