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emulators ui: fix input botch and typo

--- a/sys/src/games/eui.c

+++ b/sys/src/games/eui.c

@@ -30,7 +30,8 @@

 	void(*fn)(void);

 	Kfn *n;

 };

-Kfn kfn, kkn;

+static Kfn kfn, kkn;

+static int ax0, ax1;

 void *

 emalloc(ulong sz)

@@ -152,7 +153,10 @@

 					k |= kp->k;

 			}

 		}

-		k &= ~(k << 1 & 0xa0 | k >> 1 & 0x50);

+		if((k & ax0) == ax0)

+			k &= ~ax0;

+		if((k & ax1) == ax1)

+			k &= ~ax1;

 		keys = k;

 	}

 }

@@ -291,6 +295,10 @@

 		;

 	kp->n = emalloc(sizeof *kp);

 	strncpy(kp->n->joyk, joyk, sizeof(kp->n->joyk)-1);

+	if(strcmp(joyk, "up") == 0 || strcmp(joyk, "down") == 0)

+		ax0 |= k;

+	if(strcmp(joyk, "left") == 0 || strcmp(joyk, "right") == 0)

+		ax1 |= k;

 	kp->n->r = r;

 	kp->n->k = k;

 }

@@ -310,7 +318,7 @@

 	if(dokey)

 		proccreate(kproc != nil ? kproc : keyproc, nil, mainstacksize);

 	if(kproc == nil)

-		proccreate(joyproc, nil, mainstacksize*2);

+		proccreate(joyproc, nil, mainstacksize);

 	bg = allocimage(display, Rect(0, 0, 1, 1), screen->chan, 1, 0xCCCCCCFF);

 	screeninit();

 }