PR#3
PREFIX /A2OSX.BUILD
LOMEM $A00
INC 1
AUTO 6
*--------------------------------------
* https://www.cise.ufl.edu/~cop4600/cgi-bin/lxr/http/source.cgi/lib/ansi/gmtime.c
*--------------------------------------
SECSDAY			.EQ 86400				60*60*24
CENTURY0		.EQ 19
YEAR0			.EQ 70
DAY0			.EQ 4					day 0 was a thursday
*/--------------------------------------
* # Time.YA
*  Get System Time in Buffer
* ## In :
*  Y,A = PTR to S.TIME
* ## Out :
*  S.TIME filled with System date/time
*\--------------------------------------
K.Time.YA		>STYA ZPPtr2
				>MLICALL MLIGETTIME
				>LDYAI DATELO
				>STYA ZPPtr1
				bra TIME.PTime2TimeP1P2
*/--------------------------------------
* # PTime2Time
*  Convert ProDOS Time To S.TIME
* ## In : 
*  PUSHW = Dst PTR To S.TIME
*  PUSHW = Src PTR to ProDOS DATE/TIME (DWORD)
*\--------------------------------------
K.PTime2Time	jsr PullP1P2
TIME.PTime2TimeP1P2				
				ldy #1
				lda (ZPPtr1),y			Get Year
				lsr						C is high bit of month
				ldy #S.Time.YEAR
				sta (ZPPtr2),y			set year
				sta K.CTime.Year		for conputing Century/WDAY later
				
				lda (ZPPtr1)			Get Month/day
				pha						save Day
				ror
				lsr
				lsr
				lsr
				lsr
				ldy #S.Time.MONTH
				sta (ZPPtr2),y			set month
				
				pla						get back day
				and #$1F
				iny
				sta (ZPPtr2),y			set day
				
				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
				sta (ZPPtr2)			set Century
				sta K.CTime.Century		for conputing WDAY later

				ldy #2
				lda (ZPPtr1),y			Get Min
				tax
				iny
				lda (ZPPtr1),y			Get Hour
				
				ldy #S.Time.HOUR
				sta (ZPPtr2),y			set hour
				iny
				txa
				sta (ZPPtr2),y			set min
				iny
				lda #0
				sta (ZPPtr2),y			set seconds (ProDOS does not provide it)

* 1/1/1970 was Thursday...if not leap, add one, if leap add 2
		
K.ComputeWDAY	lda #3					Thursday : 4 (-1 for mod 7)
				pha
				lda #19
				sta K.CTime.DWORD
				lda #70
				sta K.CTime.DWORD+1
				
.1				ldy K.CTime.DWORD
				lda K.CTime.DWORD+1
				
				cpy K.CTime.Century
				bne .2
				cmp K.CTime.Year
				beq .4
				
.2				jsr TIME.IsLeapYearYA	CS = Leap			
				
				pla
				adc #1
				cmp #7
				bcc .3
				sbc #7					MOD 7
				
.3				pha
				inc K.CTime.DWORD+1
				lda K.CTime.DWORD+1
				cmp #100
				bne .1
				lda #0
				sta K.CTime.DWORD+1
				inc K.CTime.DWORD
				bra .1
				
.4				ldy #S.Time.MONTH
				lda (ZPPtr2),y			get month
				tax
				
.5				lda K.StrFTime.MDAY-1,x	get day count in this month
				bne	.6					february ?
				
				ldy K.CTime.Century
				lda K.CTime.Year
				jsr TIME.IsLeapYearYA		CS = Leap			
				
.6				pla
				adc K.StrFTime.MDAY-1,x
				cmp #7
				bcc .7
				sbc #7
				
.7				pha
				dex
				bne .5
				
				pla
				
				ldy #S.Time.DAY
				adc (ZPPtr2),y			get day in month (1..31)
				dec						adjust range 0.30 for MOD 7
				
.8				cmp #7					MOD 7
				bcc .80
				sbc #7
				bra .8
				
.80				inc						adjust range 1..7				
				ldy #S.Time.WDAY
				sta (ZPPtr2),y
				
				clc
				rts
*/--------------------------------------
* # CTime2Time
*  Convert CTIME to S.TIME
* ## In : 
*  PUSHW = Dst PTR To S.TIME
*  PUSHW = Src CTIME DWORD
*\--------------------------------------
K.CTime2Time	jsr PullP1P2
				
				ldy #3
				
.1				lda (ZPPtr1),y
				sta K.CTime.DWORD,y
				dey
				bpl .1
				
				stz	K.CTime.DivDay
				stz	K.CTime.DivDay+1
				
.2				lda K.CTime.DWORD		
				sta K.CTime.ModDay
				sec
				sbc #SECSDAY
				pha
				
				lda K.CTime.DWORD+1
				sta K.CTime.ModDay+1
				sbc /SECSDAY
				pha
				
				lda K.CTime.DWORD+2
				sta K.CTime.ModDay+2
				sbc #0
				pha

				lda K.CTime.DWORD+3
				sbc #0
				bcc .3					end of DIV/MOD ?
				
				sta K.CTime.DWORD+3

				ldx #2
				
.21				pla
				sta K.CTime.DWORD,x
				dex
				bpl .21
				
				inc K.CTime.DivDay
				bne .2
				inc K.CTime.DivDay+1
				bne .2
				
.3				pla
				pla
				pla
				stz K.CTime.Div60
				stz K.CTime.Div60+1

.4				lda K.CTime.ModDay
				sta K.CTime.Mod
				sec
				sbc #60
				pha
				
				lda K.CTime.ModDay+1
				sbc #0
				pha
				
				lda K.CTime.ModDay+2
				sbc #0
				
				bcc .5
				
				sta K.CTime.ModDay+2
				pla
				sta K.CTime.ModDay+1
				pla
				sta K.CTime.ModDay

				inc K.CTime.Div60
				bne .4
				inc K.CTime.Div60+1
				bne .4
				
.5				pla
				pla
				lda K.CTime.Mod
				ldy #S.Time.SECOND
				sta (ZPPtr2),y
				
				stz K.CTime.Div3600
				
.6				lda K.CTime.Div60				
				sta K.CTime.Mod
				sec
				sbc #60
				pha
				
				lda K.CTime.Div60+1
				sbc #0
				pha

				bcc .7
				
				sta K.CTime.Div60+1
				pla
				sta K.CTime.Div60
				
				inc K.CTime.Div3600
				bne .6
				
.7				pla

				lda K.CTime.Mod
				dey						ldy #S.Time.MINUTE
				sta (ZPPtr2),y
				
				lda K.CTime.Div3600
				dey						ldy #S.Time.HOUR
				sta (ZPPtr2),y
				
				lda K.CTime.DivDay		WDAY computation : (DivDay + DAY0) mod 7
				clc
				adc #DAY0
				pha
				lda K.CTime.DivDay+1
				adc /DAY0
				eor #$ff
				tax
				pla
				
.8				sta K.CTime.Mod
				sec
				sbc #7
				bcs .8
				inx
				bne .8
				
				lda K.CTime.Mod
				ldy #S.Time.WDAY
				sta (ZPPtr2),y
				
				lda #CENTURY0
				sta K.CTime.Century
				lda #YEAR0
				sta K.CTime.Year

K.CTime2Time.Year				
.1				ldy K.CTime.Century
				lda K.CTime.Year
				jsr TIME.IsLeapYearYA 		if Leap year CS
				
				lda #0						Toggle Carry
				rol
				eor #1
				lsr
				
				lda K.CTime.DivDay
				sbc #365
				pha
				lda K.CTime.DivDay+1
				sbc /365
				bcc .2
				
				sta K.CTime.DivDay+1
				pla
				sta K.CTime.DivDay
				
				inc K.CTime.Year
				lda K.CTime.Year
				cmp #100
				bne .1
				stz K.CTime.Year
				inc K.CTime.Century
				bne .1
				
.2				pla
				lda K.CTime.Century
*				ldy #S.Time.CENTURY
				sta (ZPPtr2)
				ldy #S.Time.YEAR
				lda K.CTime.Year
				sta (ZPPtr2),y
				
				clc
				rts
*--------------------------------------
* In :
*  Y = Century
*  A = Year (0..99)
*    if (year mod 400 = 0)
*      or 
*    if  not (year mod 100 = 0) and (year mod 4 = 0)
* Out :
*  CS = Leap
*  CC = Not Leap
*--------------------------------------
TIME.IsLeapYearYA
				cmp #0					Year = 00 ?
				bne .1					no
				
				tya						year = 00, get century in a
				and #$3					mod 4 = 0 ?
				beq .9					leap year
				
.8				clc						not leap
				rts

.1				and #$3					mod 4 = 0 ?
				bne .8
				
.9				sec						Leap
				rts
*--------------------------------------
K.StrFTime.MDAY	.DA #3,#0,#3,#2,#3,#2,#3,#3,#2,#3,#2,#3
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
*/--------------------------------------
* # StrFTime
* Convert S.TIME struct to CSTR
* ## In: 
*  PUSHW = Dst PTR To CSTR Buf
*  PUSHW = Src PTR To Format String
*   %a : Abbreviated weekday name : Thu
*   %A : Full weekday name : Thursday 
*   %b : Abbreviated month name : Aug 
*   %B : Full month name : August 
*   %d : Day of the month, zero-padded (01-31)
*   %H : Hour in 24h format (00-23) 14 
*   %I : Hour in 12h format (01-12) 02 
*   %m : Month as a decimal number (01-12) 08 
*   %M : Minute (00-59) 55 
*   %p : AM or PM designation PM 
*   %S : Second (00-61) 02 
*   %w : Weekday as a decimal number with Sunday as 0 (0-6) 
*   %y : Year, last two digits (00-99)
*   %Y : Year four digits 2001 
*  PUSHW = Src PTR To S.Time
* ## Out:
*   none. always succeed.
*\--------------------------------------
K.StrFTime		jsr PullP1P2P3
				
				ldy #0
				
.1				lda (ZPPtr2),y
				beq .8
				
				iny
				
				cmp #'%'
				beq .2
				
				jsr K.StrFTime.addChar
				bra .1
				
.2				ldx #K.StrFTime.JMPL-K.StrFTime.Tbl-1
				
				lda (ZPPtr2),y
				beq .8
				iny
				
.3				cmp K.StrFTime.Tbl,x
				beq .4
				dex
				bpl .3
				bra .1
				
.4				lda K.StrFTime.JMPL,x
				sta .5+1
				lda K.StrFTime.JMPH,x
				sta .5+2
				phy
.5				jsr $ffff
				ply
				bra .1	

.8				lda #0					Terminate C string
				sta (ZPPtr3)
				rts
*--------------------------------------
K.StrFTime.TBL	.AS "aAbBdHImMpSwyY"
K.StrFTime.JMPL .DA #K.StrFTime.A
				.DA #K.StrFTime.AA
				.DA #K.StrFTime.B
				.DA #K.StrFTime.BB
				.DA #K.StrFTime.D
				.DA #K.StrFTime.HH
				.DA #K.StrFTime.II
				.DA #K.StrFTime.M
				.DA #K.StrFTime.MM
				.DA #K.StrFTime.P
				.DA #K.StrFTime.SS
				.DA #K.StrFTime.W
				.DA #K.StrFTime.Y
				.DA #K.StrFTime.YY
*--------------------------------------
K.StrFTime.JMPH	.DA /K.StrFTime.A
				.DA /K.StrFTime.AA
				.DA /K.StrFTime.B
				.DA /K.StrFTime.BB
				.DA /K.StrFTime.D
				.DA /K.StrFTime.HH
				.DA /K.StrFTime.II
				.DA /K.StrFTime.M
				.DA /K.StrFTime.MM
				.DA /K.StrFTime.P
				.DA /K.StrFTime.SS
				.DA /K.StrFTime.W
				.DA /K.StrFTime.Y
				.DA /K.StrFTime.YY
*--------------------------------------
K.StrFTime.A	ldx #3					Short day of week, 3 chars...
				.HS	2C					Bit abs				
				 
K.StrFTime.AA	ldx #15					full DoW
				>LDYAI K.StrFTime.DAY
				>STYA ZPPtr4		
				ldy #S.Time.WDAY
				bra K.StrFTime.STR
				
K.StrFTime.B	ldx #3					Short Month, 3 chars....
				.HS	2C					Bit abs
				
K.StrFTime.BB	ldx #15					full Month....
				>LDYAI K.StrFTime.MON
				>STYA ZPPtr4		
				ldy #S.Time.MONTH
				
K.StrFTime.STR	lda (ZPPtr1),y 			get required S.Time field value
				tay
				beq .9					Illegal value
				
.1				dey						range 0..x
				beq .2
				lda (ZPPtr4)
				sec
				adc ZPPtr4
				sta ZPPtr4
				bcc .1
				inc ZPPtr4+1
				bra .1
				
.2
*				ldy #0					Y is already 0

.3				iny
				lda (ZPPtr4),y
				jsr K.StrFTime.addChar
				tya
				cmp (ZPPtr4)
				beq .8
				
				dex
				bne .3
.8				rts
				
.9				ldx #3
				lda #'?'
.99				jsr K.StrFTime.addChar
				dex
				bne .99
				rts
*--------------------------------------
K.StrFTime.D	ldy #S.Time.DAY
				bra K.StrFTime.addDecPtr1Y
K.StrFTime.HH	ldy #S.Time.HOUR
				bra K.StrFTime.addDecPtr1Y
K.StrFTime.II	ldy #S.Time.HOUR
				lda (ZPPtr1),y
				cmp #12
				bcc .1
				sbc #12
.1				bra K.StrFTime.addDecA
K.StrFTime.M	ldy #S.Time.MONTH
				bra K.StrFTime.addDecPtr1Y
K.StrFTime.MM	ldy #S.Time.MINUTE
				bra K.StrFTime.addDecPtr1Y
K.StrFTime.P	ldy #S.Time.HOUR
				lda (ZPPtr1),y
				cmp #12
				bcc .1
				lda #'p'
				.HS 2C					bit abs
.1				lda #'a'
				jsr K.StrFTime.addChar
				lda #'m'
				bra K.StrFTime.addChar
K.StrFTime.SS	ldy #S.Time.SECOND
				bra K.StrFTime.addDecPtr1Y
K.StrFTime.W	ldy #S.Time.WDAY
				bra K.StrFTime.addDecPtr1Y
K.StrFTime.YY	ldy #S.Time.CENTURY
				jsr K.StrFTime.addDecPtr1Y
K.StrFTime.Y	ldy #S.Time.YEAR
*--------------------------------------
K.StrFTime.addDecPtr1Y
				lda (ZPPtr1),y
K.StrFTime.addDecA
				sta K.StrFTime.BIN
				stz K.StrFTime.DEC
				
				sed
				ldx #8
				
.1				asl K.StrFTime.BIN

				lda K.StrFTime.DEC
				adc K.StrFTime.DEC
				sta K.StrFTime.DEC
				
				dex
				bne .1
				
				cld

*				lda K.StrFTime.DEC		already in A
				pha
				lsr
				lsr
				lsr
				lsr
				ora #$30
				jsr K.StrFTime.addChar
				pla
				and #$0f
				ora #$30
*--------------------------------------
K.StrFTime.addChar
				sta (ZPPtr3)
				inc ZPPtr3
				bne .8
				inc ZPPtr3+1
.8				rts
*--------------------------------------
K.StrFTime.DAY	>PSTR "Monday"
				>PSTR "Tuesday"
				>PSTR "Wednesday"
				>PSTR "Thursday"
				>PSTR "Friday"
				>PSTR "Saturday"
				>PSTR "Sunday"
*--------------------------------------
K.StrFTime.MON	>PSTR "January"
				>PSTR "February"
				>PSTR "March"
				>PSTR "April"
				>PSTR "May"
				>PSTR "June"
				>PSTR "July"
				>PSTR "August"
				>PSTR "September"
				>PSTR "October"
				>PSTR "November"
				>PSTR "December"
*--------------------------------------
K.StrFTime.BIN	.BS 1
K.StrFTime.DEC	.BS 1					always < 100
*--------------------------------------
MAN
SAVE /A2OSX.SRC/SYS/KERNEL.S.TIME
LOAD /A2OSX.SRC/SYS/KERNEL.S
ASM