#include <u.h>#include <libc.h>#include "time.h"#include "devrealtime.h" Ticks	fasthz; static uvlonguvmuldiv(uvlong x, ulong num, ulong den){	/* multiply, then divide, avoiding overflow */	uvlong hi; 	hi = (x & 0xffffffff00000000LL) >> 32;	x &= 0xffffffffLL;	hi *= num;	return (x*num + (hi%den << 32)) / den + (hi/den << 32);} Timeticks2time(Ticks ticks){	assert(ticks >= 0);	return uvmuldiv(ticks, Onesecond, fasthz);} Tickstime2ticks(Time time){	assert(time >= 0);	return uvmuldiv(time, fasthz, Onesecond);} inttimeconv(Fmt *f){	char buf[128], *sign;	Time t;	Ticks ticks; 	buf[0] = 0;	switch(f->r) {	case 'U':		ticks = va_arg(f->args, Ticks);		t = ticks2time(ticks);		break;	case 'T':		// Time in nanoseconds		t = va_arg(f->args, Time);		break;	default:		return fmtstrcpy(f, "(timeconv)");	}	if (t < 0) {		sign = "-";		t = -t;	}	else		sign = "";	if (t > Onesecond)		sprint(buf, "%s%d.%.3ds", sign, (int)(t / Onesecond), (int)(t % Onesecond)/1000000);	else if (t > Onemillisecond)		sprint(buf, "%s%d.%.3dms", sign, (int)(t / Onemillisecond), (int)(t % Onemillisecond)/1000);	else if (t > Onemicrosecond)		sprint(buf, "%s%d.%.3dµs", sign, (int)(t / Onemicrosecond), (int)(t % Onemicrosecond));	else		sprint(buf, "%s%dns", sign, (int)t);	return fmtstrcpy(f, buf);} char *parsetime(Time *rt, char *s){	uvlong ticks;	ulong l;	char *e, *p;	static int p10[] = {100000000, 10000000, 1000000, 100000, 10000, 1000, 100, 10, 1}; 	if (s == nil)		return("missing value");	ticks=strtoul(s, &e, 10);	if (*e == '.'){		p = e+1;		l = strtoul(p, &e, 10);		if(e-p > nelem(p10))			return "too many digits after decimal point";		if(e-p == 0)			return "ill-formed number";		l *= p10[e-p-1];	}else		l = 0;	if (*e == '\0' || strcmp(e, "s") == 0){		ticks = 1000000000 * ticks + l;	}else if (strcmp(e, "ms") == 0){		ticks = 1000000 * ticks + l/1000;	}else if (strcmp(e, "µs") == 0 || strcmp(e, "us") == 0){		ticks = 1000 * ticks + l/1000000;	}else if (strcmp(e, "ns") != 0)		return "unrecognized unit";	*rt = ticks;	return nil;}