ulib uprintf to pipe not termdev, ulib Add stringbuffer and linearlist, tb Capture subshell output

ulib/putchar.c

@@ -1,11 +1,8 @@
 #include <stdint.h>
 #include <system/system.h>
 #include <sysdefs/ipcpipe.h>
-#include <sysdefs/devctl.h>
 #include <printf/printf.h>
 
-extern Dev_t termdev;
-
 void putchar_(char c) {
-  devctl(&termdev, 0x00, (uint8_t *)&c, 1, 0);
+  ipcpipe(-1, IPCPIPE_OUT, IPCPIPE_WRITE, (uint8_t *)&c, 1);
 }