diff options
Diffstat (limited to '')
| -rw-r--r-- | usr/libc.s | 26 |
1 files changed, 18 insertions, 8 deletions
@@ -33,18 +33,28 @@ _putc: rst #0x30 ret - ;; void puts(const char *s /*DE*/) - write until NUL (no newline) + ;; void puts(const char *s /*DE*/) - write until NUL (no newline). + ;; ONE SYS_WRITE for the whole string instead of a SYS_PUTC per char: + ;; a single trap, and the kernel defers tile rendering for the whole + ;; run (sys_write batching), so a line paints each tile once. _puts: -1$: ld a, (de) + push de + ld h, d + ld l, e + ld b, #0 +1$: ld a, (hl) + or a + jr z, 2$ + inc hl + inc b + jr 1$ +2$: pop de + ld a, b or a ret z - push de - ld e, a - ld c, #16 ; SYS_PUTC + ld c, #3 ; SYS_WRITE (DE=buf, B=len) rst #0x30 - pop de - inc de - jr 1$ + ret ;; void nl(void) - CRLF via stdout _nl: |