kvisc/ka/crt/time.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.

;
; struct TIME
; {
;       byte sec;       +0      (0-59)
;       byte min;       +1      (0-59)
;       byte hour;      +2      (0-23)
;       byte mday;      +3      (0-31)
;       byte month;     +4      (0-11)
;       byte;           +5      (pad)
;       word year;      +6      (0-65536)
;       word yday;      +8      (0-365)
;       word;           +10     (pad)
;       dword;          +12     (pad)
; }                     16 bytes
;

;
; int DaysInYear(int year)
;
DaysInYear:
    mov eax, 365
    
    ; divisible by 4?
    rem ecx, ax0, 4
    jrcxnz .end

    ; divisible by 100?
    rem ecx, ax0, 100
    jrcxnz .leap

    ; divisible by 400?
    rem ecx, ax0, 400
    jrcxnz .end

.leap:
    inc eax

.end:
    ret

;
; TIME *GetTimeUTC(void)
;
GetTimeUTC:
    ytime

    mov edi, .buf

    ; seconds
    rem esi, eax, 60
    mov b[edi], esi

    ; minutes
    div esi, eax, 60
    rem esi, 60
    mov b[edi+1], esi

    ; hours
    div esi, eax, 3600
    rem esi, 24
    mov b[edi+2], esi

    ; month days
    div esi, eax, 3600*24
    mov b[edi+3], esi

    ; month
    mov b[edi+4], rbx

    ; years
    mov w[edi+6], ecx

    ;
    ; ydays (TODO)
    ;

    mov eax, .buf
    ret

.buf = [24]