91 lines
1.4 KiB
C
91 lines
1.4 KiB
C
#define __USE_XOPEN
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#define _GNU_SOURCE
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#include<stdio.h>
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#include<time.h>
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#include<stdlib.h>
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#define max_yr 9999
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#define min_yr 1900
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int isleap(int y) {
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if (y % 4 != 0) {
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return 0;
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} else if (y % 100 != 0) {
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return 1;
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} else if (y % 400 != 0) {
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return 0;
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}
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return 1;
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}
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int datevalid(int d, int m, int y) {
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if(y < min_yr || y > max_yr) {
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return 0;
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}
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if(m < 1 || m > 12) {
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return 0;
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}
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if(d < 1 || d > 31) {
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return 0;
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}
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if (m == 2) {
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if (isleap(y)) {
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if (d > 29) {
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return 0;
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}
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} else {
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if (d > 28) {
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return 0;
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}
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}
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}
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if ( m == 4 || m == 6 || m == 9 || m == 11 ) {
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if(d <= 30) {
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return 1;
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} else {
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return 0;
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}
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}
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return 1;
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}
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int main() {
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char buffer[20];
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struct tm tm = {0};
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char *retval = fgets(buffer, sizeof(buffer), stdin);
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if (retval == 0) {
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puts("Nespravny datum");
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return 0;
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}
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retval = strptime(buffer, "%e.%m.%-Y", &tm);
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if (retval == 0 || datevalid(tm.tm_mday, tm.tm_mon + 1, tm.tm_year + 1900) == 0) {
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puts("Nespravny datum");
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return 0;
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}
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tm.tm_isdst = -1;
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tm.tm_mday += 7;
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if (mktime(&tm) == -1) {
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puts("Nespravny datum");
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return 0;
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}
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strftime(buffer, sizeof(buffer), "%e.%m.%-Y", &tm);
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puts(buffer);
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putc('\n', stdout);
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return 0;
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}
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