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shell: add "loop hook" 

This hook is called during every iteration, allowing regular screen
refresh when video is involved.
This commit is contained in:
Virgil Dupras 2019-07-02 13:11:37 -04:00
parent bd003829e8
commit 748d7347c8
1 changed files with 8 additions and 2 deletions
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10
kernel/shell.asm
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@ -56,7 +56,9 @@
; Pointer to a hook to call when a cmd name isn't found
.equ SHELL_CMDHOOK SHELL_BUF+SHELL_BUFSIZE
.equ SHELL_RAMEND SHELL_CMDHOOK+2
; Pointer to a routine to call at each shell loop interation
.equ SHELL_LOOPHOOK SHELL_CMDHOOK+2
.equ SHELL_RAMEND SHELL_LOOPHOOK+2
; *** CODE ***
shellInit:
@ -66,6 +68,7 @@ shellInit:
ld (SHELL_BUF), a
ld hl, noop
ld (SHELL_CMDHOOK), hl
ld (SHELL_LOOPHOOK), hl
; print welcome
ld hl, .welcome
@ -77,7 +80,10 @@ shellInit:
; Inifite loop that processes input. Because it's infinite, you should jump
; to it rather than call it. Saves two precious bytes in the stack.
shellLoop:
; First, let's wait until something is typed.
; First, call the loop hook
ld ix, (SHELL_LOOPHOOK)
call callIX
; Then, let's wait until something is typed.
call stdioGetC
jr nz, shellLoop ; nothing typed? loop
; got it. Now, is it a CR or LF?