[Suzaku:01821] Re: スタータキットガイド（Linux開発編）サンプルアプリケーションプログラムに関して

[mizo]

$B9B^<$G$9!#(B

otao wrote:
> suzaku$B=i?4<T$G!"8=:_(Bsuzaku-S 130$B$r;HMQ$7$F!"(B
> $B%9%?!<%?%-%C%H%,%$%I!J(BLinux$B3+H/JT!K$r0lDL$j!"<B=,$7$F$*$j$^$9!#(B
> 
> $B>e5-%,%$%IFb(B
> 8.2$B!!(BLinux$B%"%W%j%1!<%7%g%s$+$iC1?'(BLED$B$rA`:n$7$F$_$k(B
> 8$B!%(B2.3$B!!%"%W%j%1!<%7%g%s$r:email@hidden$7$FC1?'#L#E#D$N>uBV$rJQ99$7$F$_$h$k(B
> $B$N<B9T$G$*J9$-$7$?$$$3$H$,$"$j$^$9!#(B
> 
> $B$3$N%"%W%j%1!<%7%g%s%W%m%0%i%`$N-"$N(Bfor$BJ8$N$H$3$m$G(Bi$B$r(B1$B%S%C%H:8%7%U%H(B
> $B$7$F(B0xff$B$H(Band$B$r$H$C$F$$$^$9$,!"(B
0xf$B$G$9$h$M!)(B

> $B$3$N(B0xff$B$H$N(Band$B$O$J$<I,MW$J$N$G$7$g$&$+!)(B
> $B3N$+$K$3$N5-=R$r:o=|$9$k$H#N#G$K$J$k$N$G!"2?$+$NBP:v$@$H$O;W$&$N$G$9$,!"(B
> $B$o$+$j$^$;$s!#(B

$email@hidden@J8$K$"$k!"(B
$B!{!VJ8;zNs(B"1","2","4","8","0"$B$r(B1 $BIC$*$-$K=g$K=q$/!W(B
$B$H!"(B
$B!{%P%C%U%!$r%*!<%P!<%U%m!<$7$J$$$?$a(B
$B$r<B8=$9$k$?$a$K!"(B0xf$B$G%^%9%/$7$F$$$^$9!#(B

$B0J2<$N%3!<%I$r(BPC(ATDE$BEy(B)$B$G<B9T$7$F$_$F$/$@$5$$!"%3%a%s%H$H$J$C$F$$$k(B
sprintf$BJ8$rJQ$($k$H=PNO$,JQ$o$k$H;W$$$^$9(B(0xf$B$N%^%9%/$rIU$1$J$$>l9g$O!"(B
$B%P%C%U%!%*!<%P!<%U%m!<$,5/$3$k$?$a%W%m%0%i%`$,=*N;$7$J$$2DG=@-$,$"$j$^(B
$B$9!#$=$N>l9g$O!"(BCtrl-c$B$r2!$7$F%W%m%0%i%`$r6/@)=*N;$5$;$F$/$@$5$$(B)$B!#(B

int main(int argc, char *argv[])
{
	char buf[2];
	int i, ret;

	for (i = 0; i < 5; i++) {
		ret = sprintf(buf, "%d", (1 << i) & 0xf);
//		ret = sprintf(buf, "%d", (1 << i));
		printf("BUF[0]: %d\n", buf[0]);
		printf("BUF[1]: %d\n", buf[1]);
		printf("RET: %d\n", ret);
	}

	return 0;
}

$B$b$7!"(B0xf$B$K$h$k%^%9%/$r9T$J$o$J$$>l9g$K$O!"(B
$B!VJ8;zNs(B"1","2","4","8","0"$B$r(B1 $BIC$*$-$K=g$K=q$/!W(B
$B$G$O$J$/!"(B
$B!VJ8;zNs(B"1","2","4","8","16"$B$r(B1 $BIC$*$-$K=g$K=q$/!W(B
$B$K$J$C$F$7$^$$$^$9!#(B

LED$B$N%l%8%9%?$O!"2<0L(B4bit$B$7$+;HMQ$7$J$$$?$a!"%I%i%$%PB&$G!"(B4bit$B0J>e$NCM(B
$B$r=q$-9~$b$&$H$9$k$H%(%i!<$K$J$k$h$&$email@hidden$7$F$"$j$^$9!#(B

linux-2.4.x/drivers/char/sil-led.c: led_write()
inval = simple_strtoul(valbuf, &endp, 16);
if (*valbuf == *endp || inval > 0xf) {
	retval = -EINVAL;
	goto err2;
}

$B$^$?!"(Bsprintf()$B$NLa$jCM(B(ret)$B$r3NG'$9$k$H!"(B"16"$B$r%P%C%U%!$K=q$/>l9g$O!"(B
"2"$B$,5"$C$F$-$F$$$k$H;W$$$^$9!#$3$l$O!"%P%C%U%!$K=q$-9~$s$@J8;z?t$G$9!#(B

[atde]$ man sprintf

$B$9$k$H=q$$$F$"$j$^$9$,!"(Bsprintf$B$OJ8;z$N=*C<$H$7$F(B\n$B$r=q$-9~$_$^$9!#(B\n$BJ,(B
$B$O!"La$jCM$K4^$^$l$^$;$s!#$=$N$?$a!"<B:]$K$O!"(B3byte$B=q$-9~$^$l$F$$$^$9!#(B

$B$h$C$F!"(B2byte$B$7$+3NJ]$7$F$$$J$$%P%C%U%!(B(buf)$B$K!"(B3byte$B=q$-9~$s$G$$$k$3$H(B
$B$K$J$k$?$a!"%P%C%U%!%*!<%P!<%U%m!<$H$J$j$^$9!#(B