static int event_compare(const void *a, const void *b)
{
const event *ae = a, *be = b;
if(ae->start.tm_year < be->start.tm_year)
return -1;
else if(ae->start.tm_year > be->start.tm_year)
return 1;
/* Years are equal, try to solve that by checking month. */
if(ae->start.tm_month < be->start.tm_month)
return -1;
else if(ae->start.tm_month > be->start.tm_month)
return 1;
/* Months are equal, go on with day, and so on. */
}
1 回答
与对多个键进行任何排序的方式相同:一次一个,按所需的优先顺序排序 .
qsort()回调可能看起来像这样: