3 files changed, 23 insertions, 6 deletions
diff --git a/src/user/knob/entry.asm b/src/user/knob/entry.asm
index 18faf7f..acf6f5f 100644
--- a/src/user/knob/entry.asm
+++ b/src/user/knob/entry.asm
@@ -12,7 +12,6 @@ _entry:
   mov esp, stack
   push edx
 
-  ;TODO: heap stuff?
   ;TODO: determine current_disk
   ;any further needed initialization
 
diff --git a/src/user/knob/format.c b/src/user/knob/format.c
index 087f6fd..645fb73 100644
--- a/src/user/knob/format.c
+++ b/src/user/knob/format.c
@@ -28,4 +28,18 @@ void itosz(uint32_t i, char *out) {
     }
   }
   *out = '\0';
+}
+
+const char *const hex_digits = "0123456789abcdef";
+
+void itosz_h8(uint8_t i, char *out) {
+  out[0] = hex_digits[i >> 4];
+  out[1] = hex_digits[i & 0xf];
+  out[2] = '\0';
+}
+
+void itosz_h32(uint32_t i, char *out) {
+  for (uint8_t digit = 0; digit < 8; ++digit)
+    out[digit] = hex_digits[(i >> (28 - digit * 4)) & 0xf];
+  out[8] = '\0';
 }
 \ No newline at end of file
diff --git a/src/user/knob/user.c b/src/user/knob/user.c
index 4ef3321..c84977c 100644
--- a/src/user/knob/user.c
+++ b/src/user/knob/user.c
@@ -165,16 +165,20 @@ uint32_t ask_user_line_sz(char *sz, uint32_t max_length) {
       goto replace;
     if (key & 0x80)
       goto replace;//TODO
+    if (key == '\b') {
+      if (i) {
+        --i;
+        _log_string("\b");
+      }
+      goto replace;
+    }
 
     log_buf[0] = key;
     _log_string(log_buf);
 
-    if (key == '\b')
-      i -= i ? 2 : 1;
-    else if (key == '\n')
+    if (key == '\n')
       break;
-    else
-      sz[i] = key;
+    sz[i] = key;
   }
 
   sz[i] = '\0';