Fullwidth text is even more upper case than upper case

fullwidth.c

#include <stdio.h>
#include <stdint.h>

int
main(void)
{
	int c, d;
	while ((c = getchar()) != EOF) {
		d = c & 0x1f;
		if ((c | 0x20) > 0x60 && d < 26) {
			putchar(0xef);
			putchar(0xbc);
			c = 0xa0 + d;
		}
		putchar(c);
	}
	return 0;
}

#ＩＮＣＬＵＤＥ <ＳＴＤＩＯ.Ｈ>
#ＩＮＣＬＵＤＥ <ＳＴＤＩＮＴ.Ｈ>

ＩＮＴ
ＭＡＩＮ(ＶＯＩＤ)
{
	ＩＮＴ Ｃ, Ｄ;
	ＷＨＩＬＥ ((Ｃ = ＧＥＴＣＨＡＲ()) != ＥＯＦ) {
		Ｄ = Ｃ & 0Ｘ1Ｆ;
		ＩＦ ((Ｃ | 0Ｘ20) > 0Ｘ60 && Ｄ < 26) {
			ＰＵＴＣＨＡＲ(0ＸＥＦ);
			ＰＵＴＣＨＡＲ(0ＸＢＣ);
			Ｃ = 0ＸＡ0 + Ｄ;
		}
		ＰＵＴＣＨＡＲ(Ｃ);
	}
	ＲＥＴＵＲＮ 0;
}