A2osX/SYS/KERNEL.S.STDLIB.txt

NEW
  AUTO 3,1
*/--------------------------------------
* # strtof
* Convert String to 40 bits Float
* ## C
* `float strtof (const char* str, char** endptr);`
* ## ASM
* **In:**
* `>PUSHWI EndPtr`
* `>LDYA str`
* `>SYSCALL strtof`
* ## RETURN VALUE
* On stack (float)
*\--------------------------------------
K.strtof		pha
				>PULLW ZPPtr1
				pla
				jsr K.AToF

				lda TXTPTR
				sta (ZPPtr1)
				ldy #1
				lda TXTPTR+1
				sta (ZPPtr1),y
				rts
*/--------------------------------------
* # AToF
* Convert String to 40 bits Float
* ## C
* `float atof (const char* str);`
* ## ASM
* **In:**
* `>LDYA str`
* `>SYSCALL atof`
* ## RETURN VALUE
* On stack (float)
*\--------------------------------------
K.AToF			>STYA TXTPTR			Ptr to source string
				lda pStack
				sec
				sbc #5
				sta pStack
				jsr CHARGOT

				ldx #FPU.FIN
				jmp GP.RomCallGetFacOnStack
*/--------------------------------------
* # StrToL/StrToUL
* Convert String to 32 bits (unsigned) int
* ## C
* `long strtol (const char* str, char** endptr, int base);`
* `unsigned long strtoul (const char* str, char** endptr, int base);`
* ## ASM
* **In:**
* `>PUSHB Base`
* `>PUSHWI EndPtr`
* `>LDYAI str`
* `>SYSCALL strtol`
* ## RETURN VALUE
* On stack (long)
*\--------------------------------------
K.StrToL		sec						Signed
				.HS 90					BCC
K.StrToUL		clc						Unsigned
				jsr SHARED.SPtr2PPtr1
				>PULLA					Base

				jsr K.AToL.I
				bcs K.StrToUL.rts
*				clc	
			
				adc ZPPtr2
				sta (ZPPtr1)
				lda #0
				adc ZPPtr2+1
				ldy #1
				sta (ZPPtr1),y
K.StrToUL.rts	rts
*/--------------------------------------
* # atol
* Convert String to 32 bits long
* ## C
* `long atol ( const char * str );`
* ## ASM
* **In:**
* `>LDYA str`
* `>SYSCALL atol`
* ## RETURN VALUE
* On stack (long)
*\--------------------------------------
K.AToL			>STYA ZPPtr2			C-String in Ptr2, Dst buffer in Ptr1

*				lda #10					base 10
				sec						signed
K.AToL.I		jsr MATH.Dec2ACC32
				bcs .9
				ldx #3

.3				lda ACC32,x
				>PUSHA
				dex
				bpl .3
				tya						Y = A = Count processed 
*				clc
.9
				rts
*/--------------------------------------
* # atoi
* Convert String to 16 bits int
* ## C
* `int atoi ( const char * str );`
* ## ASM
* **In:**
* `>LDYAI str`
* `>SYSCALL atoi`
* ## RETURN VALUE
*  Y,A = int
*\--------------------------------------
K.atoi			>STYA ZPPtr2
*				lda #10					base 10
				sec						signed
				jsr MATH.Dec2ACC32
				bcs .9
				>LDYA ACC32
.9
K.atoi.RTS		rts
*/--------------------------------------
* # RealPath
* Return the canonicalized absolute pathname
* ## C
* `unsigned short int realpath (const char* str, char *resolvedpath);`
* ## ASM
* **In:**
* `>PUSHWI resolvedpath`
* `>LDYA str`
* `>SYSCALL realpath`
* ## RETURN VALUE
* CC : success
*  Y,A = Ptr to Full Path (C-String)
*  X = hMem of Full Path
* CS : A = Error Code
*\--------------------------------------
K.realpath		sec
				.HS 90					BCC
STDLIB.realpath.I
				clc
				ror .82+1

				ldx #SYS.ExpandStr
				jsr K.SYSCALL2
				bcs K.atoi.RTS

				>STYA ZPPtr1
				stx .99+1				save expanded buffer hMem

				ldx #$ff

				lda (ZPPtr1)

				cmp #'/'				full path starting with '/'?
				beq .3					yes, do not append to current prefix

.1				ldy #S.PS.hCWD
				lda (pPs),y
				jsr K.GetMemPtr
				>STYA ZPPtr2

				ldy #$ff

.2				iny
				inx
				lda (ZPPtr2),y
				sta K.Buf256,x
				bne .2

				dex

.3				ldy #$ff

.4				iny
				inx
				lda (ZPPtr1),y
				sta K.Buf256,x
				bne .4

				dex
				beq .81					we have '/'....nothing to do...
*--------------------------------------
* X=LEN, K.Buf256 = /dir1/./../file(/)\0
*--------------------------------------
				ldx #0					will skip leading /
			
.5				ldy #0					reset dot counter=0

.6				inx
				lda K.Buf256,x
				beq .8

.7				cmp #'/'
				beq .8

				cmp #'.'
				bne .5

				iny
				bra .6

.8				tya
				beq .80					Y was 0....nothing to do...

				dey						one dot ?
				bne .9					no..

				dex
				dex
				jsr K.RealPath.RemoveAtX	we found "/.", remove,useless....
				bra .80

.9				dey						"/.." ?
				bne .99					"/..." ??!!...syntax error 

				dex
				dex
				dex
				txa						we found "/.."
				beq .99					at the beginning of string...cannot remove /dir/..

				jsr K.RealPath.RemoveAtX	remove "/.."

.10				dex
				lda K.Buf256,x			go to "/dir" 
				cmp #'/'
				bne .10

				jsr K.RealPath.RemoveAtX ...remove "/dir"

.80				lda K.Buf256,x			was / or \0 ?
				bne .5
*--------------------------------------
.81				jsr .99

.82				lda #$ff				SELF MODIFIED
				bpl .88

				>LDYAI K.Buf256
				ldx #SYS.StrDup			BANK 2
				jmp K.SYSCALL2

.88				clc
				rts

.99				lda #$ff				SELF MODIFIED
				jsr K.FreeMem

				lda #E.BADPATH
				sec
				rts
*--------------------------------------
K.RealPath.RemoveAtX
				txa						X = "/something"
				tay
.1				iny
				lda K.Buf256,y
				beq .2					found /something\0

				cmp #'/'
				bne .1					found /something/

.2				phx						save X for exit

.3				iny						K.Buf256,y=/ or 0
				inx
				lda K.Buf256-1,y
				sta K.Buf256-1,x
				bne .3

				txa
				bne .8

				lda #'/'				Make sure we have a least '/' in the buffer
				sta K.Buf256
				stz K.Buf256+1

.8				plx						restore X
				rts
*--------------------------------------
MAN
SAVE USR/SRC/SYS/KERNEL.S.STDLIB
LOAD USR/SRC/SYS/KERNEL.S
ASM