kvisc/ka/crt/fmt/printf.k

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; 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