藍色情懷

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/*
 * tzconfig.c
 *
 * Created by Jackie Xie on 2011-07-17.
 * Copyright 2011 Jackie Xie. All rights reserved.
 *
 */

#include <errno.h>
#include <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <time.h>
#include <sys/time.h>

/* ======================(function header)========================
Function Name:char* itos (){}
Description:to convert integer to string
Arguments:unsigned n
Return:a string
written by jackiexie
Date: 2007/07/10
================================================================*/
char tmpbuf[17];
char* itos (int n)
{
  int i=0,j;
  //char* s;
  //char* u;
  char s[17];
  //s= (char*) malloc(17);
  //u= (char*) malloc(17);
  
  do{
    s[i++]=(char)( n%10+48 );
    n-=n%10;
  }
  while((n/=10)>0);
  for (j=0;j<i;j++)
  tmpbuf[i-1-j]=s[j];

  tmpbuf[j]='\0';
  return tmpbuf;
}

/* ======================(function header)========================
Function Name:int getTZ(char **tz){}
Description : To find the time difference[Coordinated Universal Time
 (UTC)] between GMT and Local time zone.
Arguments : char ** tz
Return : a string with format "[+|-]hh:mm"
written by jackiexie
Date : 2011/06/02
Example :
 int main(int argc, char** argv)
 {
 char *tz;

 getTZ(&tz);
 printf("UTC%s", tz);

 return 0;
 }
================================================================*/
int getTZ(char **tz)
{
	struct tm *tptr;
	char UTC[20];
	time_t secs,l_secs,gmt_secs;
	float utc;
	char *min, *sign;
	int tmp;
	
	time(&secs);
	tptr = localtime(&secs);
	l_secs = mktime(tptr);
	tptr = gmtime(&secs);
	gmt_secs = mktime(tptr);
	utc = l_secs - gmt_secs;
	
	utc = utc/3600.0;
	//utc = -9.9;//-2.5;-3.5;-4.5;-9.5;-12;-10;5.75;8.75;12.75;13.75;14

	if(utc < 0)
		sign = strdup("-");
	else if(utc > 0)
		sign = strdup("+");

	tmp = utc * 60;
	tmp = abs(tmp) % 60;
	
	if(tmp == 30)
		min = strdup("30");
	else if(tmp == 45)
		min = strdup("45");
	else if(tmp != 0)
		min = strdup(itos(tmp));
	else
		min = strdup("00");

	tmp = (int)abs(utc);
	if(tmp <= 14 && tmp >= 10)
		sprintf(UTC, "%s%d:%s", sign, tmp, min);
	else if(tmp < 10 && tmp > 0)
		sprintf(UTC, "%s0%d:%s", sign, tmp, min);
	else
		sprintf(UTC, "00:00");

	*tz = strdup(UTC);
	//printf("%s(%s)\n", UTC, *tz);
	if(*tz == NULL)
		return -1;
	
	free(min);
	free(sign);
	
	return 0;
}

/* ======================(function header)========================
Function Name:int SetTZ(char **tz){}
Description : To Setup the system date、time by timezone information.
Arguments : char * tz
Return : a string with format "[+|-]hh:mm"
written by Jackie Xie
Date : 2011/08/18
================================================================*/
int SetTZ(char *timezone)
{
	struct tm *tptr, time_to_set;
	struct timeval tv;
	struct timezone tz;
	time_t secs;
	int utc = 0;
	int hsecs, msecs;
	int rc;
	char *sHour = strdup(timezone);
	char *sMin = strdup(timezone);

	(void) time(&secs);
	tptr = localtime(&secs);
	printf("時區是：UTC%s\n", timezone);
	printf("目前的日期時間為:\n");
	printf(" 日期: %02d年%02d月%02d日\n", 1900+tptr->tm_year, tptr->tm_mon+1, tptr->tm_mday);
	printf(" 時間: %02d:%02d:%02d\n\n", tptr->tm_hour, tptr->tm_min, tptr->tm_sec);

	if(strstr(timezone,":")){
		hsecs = atoi(strcutail(sHour, ":", -100)) * 3600;
		msecs = atoi(strmhead(sMin, ":", -100)) * 60;
	}
	else{	      

                hsecs = atoi(sHour) * 3600;

                msecs = 0;

        }

        utc = hsecs + msecs;

	(void) time(&secs);
	
	if(utc==0)
		tptr = localtime(&secs);
	else{
		secs += utc;
		tptr = gmtime(&secs);
	}

	// Make new system time.
	if ((tv.tv_sec = mktime(tptr)) == (time_t)-1)
	{
		printf("Cannot convert system time\n");
	}

	tz.tz_minuteswest = -(secs / 60);	
	tv.tv_usec = 0;
	rc = settimeofday(&tv, &tz);
	if ( rc != 0)
	{
		printf("Cannot set system time\n");
		printf("settimeofday() failed, " "errno = %d\n",errno);
		return -1;
	}
	else
		printf("settimeofday() successful.\n");


	printf("時區是：UTC%s\n", timezone);
	printf("更新後的日期和時間分別為:\n");
	printf(" 日期: %02d年%02d月%02d日\n", 1900+tptr->tm_year, tptr->tm_mon+1, tptr->tm_mday);
	printf(" 時間: %02d:%02d:%02d\n\n", tptr->tm_hour, tptr->tm_min, tptr->tm_sec);

	free(sMin);
	free(sHour);
	
	return 0;
}

int main(int argc, char *argv[])
{
	struct timeval tv;
	char help_msg[1024] = "Usage: tzconfig [-s <timezone>] [-i] [-h]\n\n";
	char *tz;
	int c;
	
	strcat(help_msg, "tzconfig command summary\n");
	strcat(help_msg, "\ttzconfig is a function to setup/get timezone infomation.\n");
	strcat(help_msg, "\t-s：setup datetime for specified timezone.\n");
	strcat(help_msg, "\t\t<timezone>：input format：'<+ | ->xx:xx' (x=[0~9]).\n");
	strcat(help_msg, "\t-i：To get te local timezone information.\n");
	strcat(help_msg, "\t-h：To show this help message.\n");

	while ((c = getopt(argc, argv, "s:i0:h0:?0")) != -1)
		switch (c) {
			case 's':
				tz = optarg;
				SetTZ(tz);
				break;
			case 'i':
				getTZ(&tz);
				printf("本地時區是：UTC%s\n", tz);
				break;
			case 'h':
			case '?':
				fprintf(stderr, "%s", help_msg);
				exit(0);
				break;
			default:
				break;
		}

	return 0;
}