diff options
| -rw-r--r-- | src/main.c | 6 | ||||
| -rw-r--r-- | src/txbuf.s | 29 |
2 files changed, 25 insertions, 10 deletions
@@ -33,12 +33,6 @@ void txbuf_init(void) { txbuflen = tx_buf[0] = 0; } -void txbuf_append_str(const char *str) { - while(*str) { - txbuf_append_chr(*str++); - } -} - void txbuf_append_str2(const char *s1, const char *s2) { txbuf_append_str(s1); txbuf_append_str(s2); diff --git a/src/txbuf.s b/src/txbuf.s index 4783660..bc1d1c2 100644 --- a/src/txbuf.s +++ b/src/txbuf.s @@ -7,7 +7,7 @@ tx_buf = $a200 ; MUST agree with src/rxtxbuf.h! .import _txbuflen - .export _txbuf_append_chr + .export _txbuf_append_chr, _txbuf_append_str .importzp sreg ; avoid ptr1 & friends, callers may use _txbuf_append_chr: @@ -23,7 +23,28 @@ _txbuf_append_chr: txa sta (sreg),y inc _txbuflen - bne @ret + bne ret inc _txbuflen+1 -@ret: - rts +ret: + rts ; always returns with Y == 0 + +;; void txbuf_append_str(const char *str) { +;; while(*str) { +;; txbuf_append_chr(*str++); +;; } +;; } + +; compiles to 52 bytes. +; this routine is 22 bytes, ~57% smaller. +_txbuf_append_str: + sta sreg+2 + stx sreg+3 + ldy #0 +@loop: + lda (sreg+2),y + beq ret + jsr _txbuf_append_chr + inc sreg+2 + bne @loop + inc sreg+3 + bne @loop |