kvisc/ka/crt/str/strcpy.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.

;
; void strcpy(char *, const char *)
;
strcpy:
    mov rax, b[ax1]
    mov b[ax0], rax

    b.z rax, zero, .1

    add ax0, ax0, 1
    add ax1, ax1, 1

    jmp strcpy

.1:
    ret

;
; void strncpy(char *, const char *, int)
;
strncpy:
    mov rcx, ax2

.1:
    ret.cxz

    mov rax, b[ax1]
    mov b[ax0], rax

    add ax0, ax0, 1
    add ax1, ax1, 1
    sub rcx, rcx, 1

    jmp .1

;
; void strnzcpy(char *, const char *, int)
;
strnzcpy:
    mov rcx, ax2

.1:
    jmp.cxz .2

    mov rax, b[ax1]
    mov b[ax0], rax

    b.z rax, zero, .3

    add ax0, ax0, 1
    add ax1, ax1, 1
    sub rcx, rcx, 1

    jmp .1

.2:
    mov b[ax0], zero

.3:
    ret