用c写的一个日历文件

/*
该程序在vc中调试运行通过.
*/
#include <stdio.h>
#include<malloc.h>
#include<string.h>
#include<stdlib.h> typedef strUCt
{
unsigned char day;
unsigned char month;
unsigned short year; }T_MFW_DATE;
typedef struct
{
T_MFW_DATE date;  /*记录的日期*/
}t_cldrecord; typedef struct
{
T_MFW_DATE today_date;  /*在程序中没有作用*/
T_MFW_DATE cursor_date;

int days_map[6][7];   /*日期地图*/

}t_cldmain_data; t_cldmain_data *cldmain_data; void cldmain_get_days_map(void); void main(void)
{
int i,j;
cldmain_data = (t_cldmain_data*)malloc(sizeof(t_cldmain_data));

cldmain_data->cursor_date.day = 20;
while(1)
{
  char buf[20];
  char *p;
  memset(buf,0,20);   printf("year month:");
  gets(buf);
  if(buf[0] == 'q')break;   cldmain_data->cursor_date.year = strtod(buf,&p);
  p ++;
  cldmain_data->cursor_date.month = strtod(p,&p);   printf("year %d month %d ",(cldmain_data->cursor_date.year),(cldmain_data->cursor_date.month));

  cldmain_get_days_map();
  printf(" mo tu w th fr sa su ");
  for(j = 0; j < 6; j ++)
  {
   printf(" ");
   for(i = 0; i < 7; i ++)
   {
    printf("%i ",cldmain_data->days_map[j][i]);
   }
   printf(" ");
  }
}
//getchar();
}
/*
检查日期是否合法
合法返回1，否则返回0
*/
int check_date(T_MFW_DATE date)
{
char month_days[] = ; /*大于2000年，小于2100年,月份合法*/
if(date.year < 2000 date.year >= 2100 date.month < 1 date.month > 12)
{
  return 0;
} /*day合法*/
if(date.day < 1)return 0;
if(date.day > month_days[date.month - 1])return 0;
if(date.month == 2)
{
  if(date.year % 4 != 0)
  {
   if(date.day == 29)return 0;
  }
}
return 1;
}
/*
功能：得到每个月第一天是星期几星期一二三四五六日
返回值：1 2 3 4 5 6 7

假如返回为0，则出错
*/
int get_weekday_of_month(T_MFW_DATE cursor_date)
{
int day;
/*参照1997年1月1日,参数cursor_date从2000年1月1日到2099年1月1日*/
//char month_days[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int this_year_days[] ={ 0, 31, 59, 90, 120, 151,181, 212, 243, 273, 304, 334};
int cursor_year_days = this_year_days[cursor_date.month - 1] + (cursor_date.day = 1);
int comp_days = (cursor_date.year - 1997)*365 + cursor_year_days;

int i = (cursor_date.year - 1997)/4;
comp_days = comp_days + i * 1;

if(cursor_date.month > 2)
{
  if( cursor_date.year % 4 == 0 )
  {
   comp_days += 1;
  }
}

if(cursor_date.day > 2098)return 0;

day = comp_days % 7;
/*1997年1月1日是星期三*/
day = (day + 2) % 7;
if(day == 0)day = 7;
return day;
}
/*
根据参数的值,得到该年该月有多少天.
返回值:该月的天数
*/
int count_days_of_month(T_MFW_DATE cursor_date)
{
char month_days[] = ;
unsigned char day = cldmain_data->cursor_date.day;
unsigned char month = cldmain_data->cursor_date.month;
unsigned short year = cldmain_data->cursor_date.year;

if(month != 2)
{
  return month_days[month -1];
}
else
{
  if(year%4 != 0)
  {
   return 28;
  }
  if(year%4 == 0)
  {
   if(year%100 == 0)
   {
    if(year %400 == 0)
    {
     return 29;
    }
    return 28;
   }
   return 29;
  }
}
}
/*
得到日期地图,保存到全局结构变量cldmain_data的成员数组变量days_map中.
*/
void cldmain_get_days_map(void)
{
int i;
int day; T_MFW_DATE cursor_date = cldmain_data->cursor_date;
int *map_p = cldmain_data->days_map[0];
int days_count;
int weekday; for(i = 0; i < 6*7; i++)
{
  map_p[i] = 0;
} if(check_date(cldmain_data->cursor_date) == 0)return; days_count = count_days_of_month(cldmain_data->cursor_date);
weekday = get_weekday_of_month(cldmain_data->cursor_date); day = 1;
for(i = weekday-1; i < days_count + weekday - 1; i++)
{
  map_p[i] = day;
  day ++;
}
}