kernel/vfs: Don't ignore buffer length in write(stream)

applications/sh/main.asm

@@ -233,16 +233,19 @@ shell_clear_buffer:
 ; outputs:
 ; none
 print_character_to_terminal:
+    push r0
     push r1
     push r2
 
     mov.8 [shell_char_buffer], r0
+    mov r0, 1
     mov r1, [shell_terminal_stream_struct_ptr]
     mov r2, shell_char_buffer
     call write
 
     pop r2
     pop r1
+    pop r0
     ret
 
 ; print a string to the terminal
@@ -257,6 +260,7 @@ print_str_to_terminal:
     mov r1, [shell_terminal_stream_struct_ptr]
     mov r2, r0
 print_str_to_terminal_loop:
+    mov r0, 1
     call write
     inc r2
     cmp.8 [r2], 0x00

kernel/vfs.asm

@@ -91,7 +91,7 @@ stream_read:
 
 ; write specified number of bytes into the specified file
 ; inputs:
-; r0: number of bytes to write (ignored if file struct is a stream)
+; r0: number of bytes to write
 ; r1: pointer to file struct
 ; r2: pointer to source buffer (always 4 bytes if file struct is a stream)
 ; outputs:
@@ -111,6 +111,20 @@ write:
     pop r3
     ret
 stream_write:
+    push r31
+    push r2
+
+    mov r31, r0 ; number of bytes to write = loop count
+stream_write_loop:
+    call stream_write_char
+    inc r2
+    loop stream_write_loop
+
+    pop r2
+    pop r31
+    ret
+
+stream_write_char:
     push r0
     push r1