接着上一篇liblunar的日历bug问题，这里写了一个查询月份的工具，代码比较简陋

/*
 * author:pallover#gmail.com
 * website: http://pallove.is-programmer.com/
 */

#include <lunar/lunar.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>


int str2int(const char *str)
{
    int n = 0;
    while(*str >= '0' && *str <= '9')
    {
        n = n * 10 + (*str - '0');
        str++;
    }
    return n;
}

int get_weekday(int year, int month, int day)
{
    int m = month;
    if(m == 1) {
        m = 13;
        year -= 1;
    }
    else if(m == 2) {
        m = 14;
        year -= 1;
    }

    int c = year / 100;
    int y = year % 100;
    int d = day;

    return (((c >> 2) - (c << 1) + y + (y >> 2) + (13 * (m + 1) / 5) + d - 1) % 7 + 7) % 7;
}

int get_mdays(int year, int month)
{
    switch(month) {
        case 1:
        case 3:
        case 5:
        case 7:
        case 8:
        case 10:
        case 12:
            return 31;
        case 4:
        case 6:
        case 9:
        case 11:
            return 30;
        case 2:
            if(!(year % 4) && year % 100 || !(year % 400))
                return 29;
            else
                return 28;
    }
}

int main(int argc, char *argv[])
{

    struct tm *tm_ptr;
    time_t the_time;
    (void) time(&the_time);
    tm_ptr = localtime(&the_time);

    int nyear = 0, nmonth = 1, nday = 1;
    if(argc > 1) {
        nyear = str2int(argv[1]);
        if(nyear <= 1900) nyear = tm_ptr->tm_year + 1900;

        if(argc > 2) {
            nmonth = str2int(argv[2]);
            if(nmonth < 1) nmonth = 1;

            if(argc > 3) {
                nday = str2int(argv[3]);
                if(nday < 1) nday = 1;
            }
        }
    }
    else {
        nyear = tm_ptr->tm_year + 1900;
        nmonth = tm_ptr->tm_mon + 1;
        nday = tm_ptr->tm_mday;
        printf("%d, %d, %d\n", nyear, nmonth, nday);
    }

    lunar_init(&argc, &argv);
    LunarDate *lunar_date = lunar_date_new();

    lunar_date_set_solar_date(lunar_date, nyear, nmonth, nday, 1, NULL);
    gchar *str = lunar_date_strftime(lunar_date, "%(NIAN)年%(YUE)月%(RI) 生肖:%(shengxiao) \n节日:%(jieri)");
    printf("\n%*s%s%d年%d月%d日%s\n\n", 20, "", "\033[47m\033[31m", nyear, nmonth, nday, "\033[0m");
    printf("农历:%s\n\n", str);

    char *weekday = "日一二三四五六";
    char ch[4];
    while(*weekday){
        strncpy(ch, weekday, 3);
        ch[3] = 0;
        weekday += 3;
        printf("%*s%2s", 6, "", ch);
    }

    int i = 1, line, nlen, n, firstwday, endline = 0;
    int nmdays = get_mdays(nyear, nmonth);
    firstwday = get_weekday(nyear, nmonth, 1);

    printf("\n");
    line = 7 - firstwday;

    while(nmdays > 0)
    {
        if(line % 7 && !endline)
            printf("%*s", firstwday << 3, "");

        for(nlen = 0; nlen < line; nlen++, i++) {
            n = get_weekday(nyear, nmonth, i);
            printf("%*s%s%2d%s", 6, "", ((i == nday) ? "\033[36m\033[1m" : ""), i, ((i == nday) ? "\033[0m" : ""));
        }

        i -= line;
        if(n == 6 || endline) {
            printf("\n");
        }

        if(line % 7 && !endline)
            printf("%*s", firstwday << 3, "");

        for(nlen = 0; nlen < line; nlen++, i++) {
            lunar_date_set_solar_date(lunar_date, nyear, nmonth, i, 0, NULL);
            printf("%*s%s%4s%s", 4, "", ((i == nday) ? "\033[36m\033[1m" : ""), lunar_date_strftime(lunar_date, "%(RI)"), ((i == nday) ? "\033[0m" : ""));

        }
        if(n == 6 || endline) {
            printf("\n\n");
        }

        nmdays -= line;
        line = (nmdays >= 7) ? 7 : nmdays % 7, endline = 1;
    }

    lunar_date_free(lunar_date);

    exit(0);
}

可以传入0-3个自己想查询有效参数（年，月，日），如不输入，则默认为本地日期。

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