A2osX/SYS/KERNEL.S.TIME.txt

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PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
*--------------------------------------
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* https://www.cise.ufl.edu/~cop4600/cgi-bin/lxr/http/source.cgi/lib/ansi/gmtime.c
*--------------------------------------
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SECSDAY .EQ 86400 60*60*24
CENTURY0 .EQ 19
YEAR0 .EQ 70
DAY0 .EQ 4 day 0 was a thursday
*--------------------------------------
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* K.TimeYA get System Time
* In :
* Y,A = PTR to S.TIME
* Out :
* S.TIME filled with System date/time
*--------------------------------------
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K.TimeYA >STYA ZPPtr2
>MLICALL MLIGETTIME
>LDYAI DATELO
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>STYA ZPPtr1
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bra K.PTime2Time.1
*--------------------------------------
* In :
* PULLW = Src PDATE/TIME (DWORD)
* PULLW = Dst PTR To S.TIME
*--------------------------------------
K.PTime2Time jsr PullPtr1Ptr2
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K.PTime2Time.1 ldy #1
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lda (ZPPtr1),y Get Year
lsr C is high bit of month
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ldy #S.Time.YEAR
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sta (ZPPtr2),y set year
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sta K.CTime.Year for conputing Century/WDAY later
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lda (ZPPtr1) Get Month/day
pha save Day
ror
lsr
lsr
lsr
lsr
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ldy #S.Time.MONTH
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sta (ZPPtr2),y set month
pla get back day
and #$1F
iny
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sta (ZPPtr2),y set day
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lda K.CTime.Year get back year
cmp #69 if before 70 CC,if > 70, CS
lda #0
rol get back C in bit 0
eor #1 toggle C
adc #19 set date before 1970 -> 20xx
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sta (ZPPtr2) set Century
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sta K.CTime.Century for conputing WDAY later
ldy #2
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lda (ZPPtr1),y Get Min
tax
iny
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lda (ZPPtr1),y Get Hour
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ldy #S.Time.HOUR
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sta (ZPPtr2),y set hour
iny
txa
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sta (ZPPtr2),y set min
iny
lda #0
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sta (ZPPtr2),y set seconds (ProDOS does not provide it)
* 1/1/1970 was Thursday...if not leap, add one, if leap add 2
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K.ComputeWDAY lda #3 Thursday : 4 (-1 for mod 7)
pha
lda #19
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sta K.CTime.DWORD
lda #70
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sta K.CTime.DWORD+1
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.1 ldy K.CTime.DWORD
lda K.CTime.DWORD+1
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cpy K.CTime.Century
bne .2
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cmp K.CTime.Year
beq .4
.2 jsr TIME.IsLeapYearYA CC = Leap
lda #0
rol
eor #1
lsr
pla
adc #1
cmp #7
bcc .3
sbc #7 MOD 7
.3 pha
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inc K.CTime.DWORD+1
lda K.CTime.DWORD+1
cmp #100
bne .1
lda #0
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sta K.CTime.DWORD+1
inc K.CTime.DWORD
bra .1
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.4 ldy #S.Time.MONTH
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lda (ZPPtr2),y get month
tax
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.5 lda K.StrFTime.MDAY-1,x get day count in this month
bne .6 february ?
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ldy K.CTime.Century
lda K.CTime.Year
jsr TIME.IsLeapYearYA CC = Leap
lda #0
rol
eor #1
lsr
.6 pla
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adc K.StrFTime.MDAY-1,x
cmp #7
bcc .7
sbc #7
.7 pha
dex
bne .5
pla
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ldy #S.Time.DAY
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adc (ZPPtr2),y get month (1..31)
dec adjust range 0.31 for MOD 7
.8 cmp #7 MOD 7
bcc .80
sbc #7
bra .8
.80 inc adjust range 1..7
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ldy #S.Time.WDAY
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sta (ZPPtr2),y
clc
rts
*--------------------------------------
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* K.CTime2Time
* In :
* PULLW = Src CTIME DWORD
* PULLW = Dst PTR To S.TIME
*--------------------------------------
K.CTime2Time jsr PullPtr1Ptr2
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ldy #3
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.1 lda (ZPPtr1),y
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sta K.CTime.DWORD,y
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dey
bpl .1
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stz K.CTime.DivDay
stz K.CTime.DivDay+1
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.2 lda K.CTime.DWORD
sta K.CTime.ModDay
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sec
sbc #SECSDAY
pha
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lda K.CTime.DWORD+1
sta K.CTime.ModDay+1
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sbc /SECSDAY
pha
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lda K.CTime.DWORD+2
sta K.CTime.ModDay+2
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sbc #0
pha
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lda K.CTime.DWORD+3
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sbc #0
bcc .3 end of DIV/MOD ?
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sta K.CTime.DWORD+3
ldx #2
.21 pla
sta K.CTime.DWORD,x
dex
bpl .21
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inc K.CTime.DivDay
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bne .2
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inc K.CTime.DivDay+1
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bne .2
.3 pla
pla
pla
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stz K.CTime.Div60
stz K.CTime.Div60+1
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.4 lda K.CTime.ModDay
sta K.CTime.Mod
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sec
sbc #60
pha
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lda K.CTime.ModDay+1
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sbc #0
pha
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lda K.CTime.ModDay+2
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sbc #0
bcc .5
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sta K.CTime.ModDay+2
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pla
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sta K.CTime.ModDay+1
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pla
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sta K.CTime.ModDay
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inc K.CTime.Div60
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bne .4
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inc K.CTime.Div60+1
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bne .4
.5 pla
pla
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lda K.CTime.Mod
ldy #S.Time.SECOND
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sta (ZPPtr2),y
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stz K.CTime.Div3600
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.6 lda K.CTime.Div60
sta K.CTime.Mod
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sec
sbc #60
pha
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lda K.CTime.Div60+1
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sbc #0
pha
bcc .7
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sta K.CTime.Div60+1
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pla
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sta K.CTime.Div60
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inc K.CTime.Div3600
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bne .6
.7 pla
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lda K.CTime.Mod
dey ldy #S.Time.MINUTE
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sta (ZPPtr2),y
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lda K.CTime.Div3600
dey ldy #S.Time.HOUR
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sta (ZPPtr2),y
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lda K.CTime.DivDay WDAY computation : (DivDay + DAY0) mod 7
clc
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adc #DAY0
pha
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lda K.CTime.DivDay+1
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adc /DAY0
eor #$ff
tax
pla
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.8 sta K.CTime.Mod
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sec
sbc #7
bcs .8
inx
bne .8
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lda K.CTime.Mod
ldy #S.Time.WDAY
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sta (ZPPtr2),y
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lda #CENTURY0
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sta K.CTime.Century
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lda #YEAR0
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sta K.CTime.Year
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K.CTime2Time.Year
.1 ldy K.CTime.Century
lda K.CTime.Year
jsr TIME.IsLeapYearYA if Leap year CC
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lda K.CTime.DivDay
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sbc #365
pha
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lda K.CTime.DivDay+1
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sbc /365
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bcc .2
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sta K.CTime.DivDay+1
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pla
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sta K.CTime.DivDay
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inc K.CTime.Year
lda K.CTime.Year
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cmp #100
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bne .1
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stz K.CTime.Year
inc K.CTime.Century
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bne .1
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.2 pla
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lda K.CTime.Century
* ldy #S.Time.CENTURY
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sta (ZPPtr2)
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ldy #S.Time.YEAR
lda K.CTime.Year
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sta (ZPPtr2),y
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clc
rts
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*--------------------------------------
* In :
* Y = Century
* A = Year (0..99)
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* if (year mod 400 = 0)
* or
* if not (year mod 100 = 0) and (year mod 4 = 0)
* Out :
* CC = Leap
* CS = Not Leap
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*--------------------------------------
TIME.IsLeapYearYA
cmp #0 Year = 00 ?
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bne .1 no
tya year = 00, get century in a
and #$3 mod 4 = 0 ?
beq .9 leap year
.8 sec not leap
rts
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.1 and #$3 mod 4 = 0 ?
bne .8
.9 clc Leap
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rts
*--------------------------------------
K.StrFTime.MDAY .DA #3,#0,#3,#2,#3,#2,#3,#3,#2,#3,#2,#3
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K.CTime.DWORD .BS 4
K.CTime.DivDay .BS 2
K.CTime.ModDay .BS 3
K.CTime.Div60 .BS 2
K.CTime.Div3600 .BS 1
K.CTime.Mod .BS 1
K.CTime.Century .BS 1
K.CTime.Year .BS 1
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.Time
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM