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#include "date.h"
#define _BSD_SOURCE
enum month {JAN=1, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC} month;
enum weekday {SUN=0, MON, TUE, WED, THU, FRI, SAT} weekday;
Date extract_date(char *str) {
Date ret;
sscanf(str, "%d-%d-%d",
&ret.year,
&ret.month,
&ret.day);
return ret;
}
Date adjust_date(Date date) {
if (date.month == FEB && date.day > 28) {
if (date.year % 4 == 0 && date.day > 29) {
date.day -= 29; date.month++;
} else {
date.day -= 28; date.month++;
}
} else if (date.month == JAN || date.month == MAR || date.month == MAY || date.month == JUL ||
date.month == AUG || date.month == OCT || date.month == DEC) {
if (date.day > 31 && date.month == DEC) {
date.day -= 31; date.month = 1;
} else if (date.day > 31) {
date.day -= 31; date.month++;
}
} else if (date.month == APR || date.month == JUN || date.month == SEP || date.month == NOV) {
if (date.day > 30) {
date.day -= 30; date.month++;
}
}
return date;
}
bool smaller(Date a, Date b) {
if (zero(b)) return true;
if (zero(a)) return false;
return ((a.year < b.year) ||
((a.year == b.year) && (a.month < b.month)) ||
((a.year == b.year) && (a.month == b.month) && (a.day <= b.day)));
}
bool strictly_smaller(Date a, Date b) {
if (zero(b)) return true;
if (zero(a)) return false;
return ((a.year < b.year) ||
((a.year == b.year) && (a.month < b.month)) ||
((a.year == b.year) && (a.month == b.month) && (a.day < b.day)));
}
bool eql(Date a, Date b) {
return (a.day == b.day) &&
(a.month == b.month) &&
(a.year == b.year);
}
bool zero(Date a) {
return ((a.year == 0) ||
(a.month == 0) ||
(a.day == 0));
}
void print_date(Date date) {
printf("%i/%i/%i\n", date.month, date.day, date.year);
}
char *print_date_to_string(Date date) {
char *ret = (char *)calloc(16, 1);
sprintf(ret, "%i/%i/%i", date.month, date.day, date.year);
return ret;
}
Date today() {
FILE *pipe = popen("date \"+%Y-%m-%d\"", "r");
char *td = (char *)malloc(12);
td = fgets(td, 12, pipe);
Date ret = extract_date(td);
pclose(pipe);
free(td);
return ret;
}
Date tomorrow(Date td) {
Date tm = { td.day+1, td.month, td.year };
return adjust_date(tm);
}
Date nextweek(Date td) {
Date nw = { td.day+7, td.month, td.year };
return adjust_date(nw);
}
Date nextmonth(Date td) {
Date nm = { td.day, td.month+1, td.year };
return adjust_date(nm);
}
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