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#include <u.h>
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#include <libc.h>
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#include <auth.h>
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#include <fcall.h>
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#include "../boot/boot.h"
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static long lusertime(char*);
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char *timeserver = "#s/boot";
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void
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settime(int islocal, int afd, char *rp)
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{
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	int n, f;
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	Dir dir[2];
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	char timebuf[64];
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	static int timeset;
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	if(timeset)
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		return;
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	print("time...");
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	if(islocal){
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		/*
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		 *  set the time from the real time clock
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		 */
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		f = open("#r/rtc", ORDWR);
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		if(f >= 0){
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			if((n = read(f, timebuf, sizeof(timebuf)-1)) > 0){
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				timebuf[n] = '\0';
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				timeset = 1;
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			}
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			close(f);
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		}else do{
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			strcpy(timebuf, "yymmddhhmm[ss]");
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			outin("\ndate/time ", timebuf, sizeof(timebuf));
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		}while((timeset=lusertime(timebuf)) <= 0);
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	}
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	if(timeset == 0){
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		/*
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		 *  set the time from the access time of the root
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		 */
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		f = open(timeserver, ORDWR);
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		if(f < 0)
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			return;
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		if(mount(f, afd, "/tmp", MREPL, rp) < 0){
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			warning("settime mount");
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			close(f);
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			return;
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		}
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		close(f);
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		if(stat("/tmp", statbuf, sizeof statbuf) < 0)
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			fatal("stat");
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		convM2D(statbuf, sizeof statbuf, &dir[0], (char*)&dir[1]);
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		sprint(timebuf, "%ld", dir[0].atime);
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		unmount(0, "/tmp");
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	}
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	f = open("#c/time", OWRITE);
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	if(write(f, timebuf, strlen(timebuf)) < 0)
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		warning("can't set #c/time");
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	close(f);
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	print("\n");
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}
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#define SEC2MIN 60L
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#define SEC2HOUR (60L*SEC2MIN)
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#define SEC2DAY (24L*SEC2HOUR)
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int
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g2(char **pp)
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{
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	int v;
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	v = 10*((*pp)[0]-'0') + (*pp)[1]-'0';
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	*pp += 2;
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	return v;
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}
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/*
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 *  days per month plus days/year
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 */
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static	int	dmsize[] =
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{
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	365, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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static	int	ldmsize[] =
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{
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	366, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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/*
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 *  return the days/month for the given year
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 */
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static int *
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yrsize(int y)
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{
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	if((y%4) == 0 && ((y%100) != 0 || (y%400) == 0))
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		return ldmsize;
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	else
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		return dmsize;
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}
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/*
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 *  compute seconds since Jan 1 1970
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 */
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static long
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lusertime(char *argbuf)
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{
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	char *buf;
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	ulong secs;
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	int i, y, m;
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	int *d2m;
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	buf = argbuf;
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	i = strlen(buf);
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	if(i != 10 && i != 12)
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		return -1;
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	secs = 0;
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	y = g2(&buf);
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	m = g2(&buf);
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	if(y < 70)
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		y += 2000;
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	else
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		y += 1900;
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	/*
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	 *  seconds per year
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	 */
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	for(i = 1970; i < y; i++){
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		d2m = yrsize(i);
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		secs += d2m[0] * SEC2DAY;
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	}
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	/*
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	 *  seconds per month
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	 */
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	d2m = yrsize(y);
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	for(i = 1; i < m; i++)
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		secs += d2m[i] * SEC2DAY;
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	secs += (g2(&buf)-1) * SEC2DAY;
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	secs += g2(&buf) * SEC2HOUR;
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	secs += g2(&buf) * SEC2MIN;
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	if(*buf)
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		secs += g2(&buf);
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	sprint(argbuf, "%ld", secs);
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	return secs;
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}