kvisc/ka/crt/fmt/printf.k

; The OS/K Team licenses this file to you under the MIT license.
; See the LICENSE file in the project root for more information.

;
; int putc(int ch)
;
putc:
    prn ax0
    nul rax
    ret

;
; int printf(const char *fmt, ...)
;
printf:
    mov ax2, ax0
    mov ax0, putc
    mov ax1, STRLEN_MAX
    add ax3, rsp, 8
    jmp doprnt

;
; int nprintf(const char *fmt, int n, ...)
;
nprintf:
    mov ax2, ax0
    mov ax0, putc
    add ax3, rsp, 8
    jmp doprnt

;
; Print a string
; Guaranteed to only affect rcx and ax0
;
print:
.l:
    movzx rax, b[ax0]
    jraxz .r

    prn rax
    inc ax0, 1

    jmp .l

.r:
    ret

;
; Print exactly ax1 characters
;
nprint:
    mov rcx, ax1
    jrcxz .r

.l:
    prn b[ax0]
    inc ax0, 1
    loop .l
.r:
    ret