126 lines
2.6 KiB
C
126 lines
2.6 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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int width = 80, year = 1969;
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int cols, lead, gap;
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const char *wdays[] = { "Su", "Mo", "Tu", "We", "Th", "Fr", "Sa" };
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struct months {
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const char *name;
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int days, start_wday, at;
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} months[12] = {
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{ "January", 31, 0, 0 },
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{ "February", 28, 0, 0 },
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{ "March", 31, 0, 0 },
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{ "April", 30, 0, 0 },
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{ "May", 31, 0, 0 },
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{ "June", 30, 0, 0 },
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{ "July", 31, 0, 0 },
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{ "August", 31, 0, 0 },
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{ "September", 30, 0, 0 },
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{ "October", 31, 0, 0 },
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{ "November", 30, 0, 0 },
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{ "December", 31, 0, 0 }
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};
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void space(int n) { while (n-- > 0) putchar(' '); }
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void init_months()
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{
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int i;
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if ((!(year % 4) && (year % 100)) || !(year % 400))
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months[1].days = 29;
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year--;
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months[0].start_wday
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= (year * 365 + year/4 - year/100 + year/400 + 1) % 7;
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for (i = 1; i < 12; i++)
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months[i].start_wday =
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(months[i-1].start_wday + months[i-1].days) % 7;
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cols = (width + 2) / 22;
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while (12 % cols) cols--;
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gap = cols - 1 ? (width - 20 * cols) / (cols - 1) : 0;
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if (gap > 4) gap = 4;
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lead = (width - (20 + gap) * cols + gap + 1) / 2;
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year++;
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}
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void print_row(int row)
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{
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int c, i, from = row * cols, to = from + cols;
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space(lead);
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for (c = from; c < to; c++) {
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i = strlen(months[c].name);
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space((20 - i)/2);
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printf("%s", months[c].name);
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space(20 - i - (20 - i)/2 + ((c == to - 1) ? 0 : gap));
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}
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putchar('\n');
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space(lead);
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for (c = from; c < to; c++) {
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for (i = 0; i < 7; i++)
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printf("%s%s", wdays[i], i == 6 ? "" : " ");
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if (c < to - 1) space(gap);
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else putchar('\n');
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}
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while (1) {
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for (c = from; c < to; c++)
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if (months[c].at < months[c].days) break;
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if (c == to) break;
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space(lead);
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for (c = from; c < to; c++) {
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for (i = 0; i < months[c].start_wday; i++) space(3);
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while(i++ < 7 && months[c].at < months[c].days) {
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printf("%2d", ++months[c].at);
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if (i < 7 || c < to - 1) putchar(' ');
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}
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while (i++ <= 7 && c < to - 1) space(3);
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if (c < to - 1) space(gap - 1);
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months[c].start_wday = 0;
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}
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putchar('\n');
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}
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putchar('\n');
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}
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void print_year()
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{
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int row;
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char buf[32];
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sprintf(buf, "%d", year);
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space((width - strlen(buf)) / 2);
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printf("%s\n\n", buf);
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for (row = 0; row * cols < 12; row++)
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print_row(row);
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}
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int main(int c, char **v)
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{
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int i, year_set = 0;
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for (i = 1; i < c; i++) {
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if (!strcmp(v[i], "-w")) {
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if (++i == c || (width = atoi(v[i])) < 20)
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goto bail;
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} else if (!year_set) {
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if (!sscanf(v[i], "%d", &year) || year <= 0)
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year = 1969;
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year_set = 1;
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} else
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goto bail;
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}
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init_months();
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print_year();
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return 0;
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bail: fprintf(stderr, "bad args\nUsage: %s year [-w width (>= 20)]\n", v[0]);
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exit(1);
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}
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