Get usb/usbaudio and usb/usbmouse to work again. In usbmouse is the dependency on
stdio.h removed, so it got 30Kb smaller on my dev machine.

Reference: /n/sources/patch/applied/usbaudio-mouse-work
Date: Fri Jan 20 15:40:49 CET 2006

--- /sys/src/cmd/usb/misc/usbmouse.c	Fri Jan 20 15:40:11 2006
+++ /sys/src/cmd/usb/misc/usbmouse.c	Fri Jan 20 15:40:07 2006
@@ -1,11 +1,10 @@
 #include <u.h>
 #include <libc.h>
 #include <thread.h>
-#include <stdio.h>
 
 int mousefd, ctlfd, mousein;
 
-char hbm[]		= "Enabled 0x020103\n";
+char hbm[]		= "Enabled 0x020103";
 char *mouseinfile	= "/dev/mousein";
 char *statfmt		= "/dev/usb%d/%d/status";
 char *ctlfmt		= "/dev/usb%d/%d/ctl";
@@ -87,8 +86,7 @@
 void
 threadmain(int argc, char *argv[])
 {
-	FILE *f;
-	int ctlrno, i;
+	int ctlrno, i, sfd;
 	char line[256];
 
 	ARGBEGIN{
@@ -112,17 +110,17 @@
 	case 0:
 		for (ctlrno = 0; ctlrno < 16; ctlrno++) {
 			for (i = 0; i < 128; i++) {
-				sprint(line, statfmt, ctlrno, i);
-				f = fopen(line, "r");
-				if (f == nil)
+				snprint(line, sizeof line, statfmt, ctlrno, i);
+				sfd = open(line, OREAD);
+				if (sfd < 0)
 					break;
-				if (fgets(line, sizeof line, f) && strcmp(hbm, line) == 0) {
+				if (read(sfd, line, strlen(hbm)) && strncmp(hbm, line, strlen(hbm)) == 0) {
 					snprint(ctlfile, sizeof ctlfile, ctlfmt, ctlrno, i);
 					snprint(msefile, sizeof msefile, msefmt, ctlrno, i);
-					fclose(f);
+					close(sfd);
 					goto found;
 				}
-				fclose(f);
+				close(sfd);
 			}
 		}
 		threadexitsall("no mouse");
--- /sys/src/cmd/usb/audio/usbaudio.c	Fri Jan 20 15:40:31 2006
+++ /sys/src/cmd/usb/audio/usbaudio.c	Fri Jan 20 15:40:26 2006
@@ -16,7 +16,7 @@
 
 Channel *controlchan;
 
-char audstr[]		= "Enabled 0x000101\n";	/* audio.control.0 */
+char audstr[]		= "Enabled 0x000101";	/* audio.control.0 */
 
 int defaultspeed[2] = {44100, 44100};