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cc65/libsrc/cx16/settime.s

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;
; 2019-12-27, Greg King
;
; int __fastcall__ clock_settime (clockid_t clk_id, const struct timespec *tp);
;
.include "time.inc"
.include "cx16.inc"
.importzp ptr1
.import pushax, pusheax, ldax0sp, ldeaxidx
.import tosdiveax, incsp3, return0
.import load_jiffy
.import CLOCK_SET_DATE_TIME
.macro COPY reg, offset
ldy #offset
lda (ptr1),y
sta gREG::reg
.endmac
;----------------------------------------------------------------------------
.proc _clock_settime
jsr pushax
.assert timespec::tv_sec = 0, error
jsr _localtime
sta ptr1
stx ptr1+1
COPY r0L, tm::tm_year
COPY r0H, tm::tm_mon
inc gREG::r0H
COPY r1L, tm::tm_mday
COPY r1H, tm::tm_hour
COPY r2L, tm::tm_min
COPY r2H, tm::tm_sec
jsr ldax0sp ; Get tp
ldy #timespec::tv_nsec+3
jsr ldeaxidx ; Get nanoseconds
jsr pusheax
jsr load_jiffy
jsr tosdiveax
sta gREG::r3L ; Put number of jiffies
jsr CLOCK_SET_DATE_TIME
jsr incsp3
jmp return0
.endproc