A2osX/SYS/KERNEL.S.UNISTD.txt

NEW
  AUTO 3,1
*/--------------------------------------
* # open
* ## C
* `hFD open(const char *pathname, short int flags);`
* ## ASM
* **In:**
* `>PUSHB flags`
* `>LDYA pathname`
* `>SYSCALL open`
* ## RETURN VALUE
* A = hFD
* REG File created on ProDOS : T=TXT,X=$0000
*\--------------------------------------
				.DUMMY
				.OR ZPTMP+20			7 Bytes
IO.Open.FLAGS	.BS 1
IO.Open.TYPE	.BS 1
IO.Open.AUXTYPE	.BS 2
IO.hDev			.BS 1
IO.hFD			.BS 1
IO.hFILE		.BS 1
				.ED
*--------------------------------------		
K.Open			jsr PFT.YAToMLIPATH
				>PULLB IO.Open.FLAGS

				lda #S.FI.T.TXT
				sta IO.Open.TYPE
				stz IO.Open.AUXTYPE
				stz IO.Open.AUXTYPE+1
*--------------------------------------
UNISTD.Open		ldx #5					/DEV/ 
				cpx K.MLI.PATH
				bcs .9	
				
.1				lda K.MLI.PATH,x
				cmp IO.DEVDIR-1,x
				bne .9
				dex
				bne .1
*--------------------------------------		
* /DEV/xxxxxx (CDEV,BDEV,LNK,DSOCK,SSOCK,PIPE)
*--------------------------------------		
				>LDYAI K.MLI.PATH+6		skip $/DEV/

				jsr K.GetDevByName
				bcc .7
				
				ldx #2
				
.10				lda Nod.Table.hPath-2,x
				beq .3

				jsr K.GetMemPtr
				>STYA ZPPtr1
				
				ldy #0
				
.2				lda (ZPPtr1),y
				iny
				cmp K.MLI.PATH,y
				bne .3
				cmp #0					end of string ?
				bne .2
				
				lda Nod.Table.hFD-2,x		return hFD
				jsr IO.GetPFD
				
				bra .71
				
.3				inx
				cpx #K.NOD.MAX+2
				bne .10
				
				lda #MLI.E.NODEV
*				sec				
				rts						no OF found
				
.7				stx IO.hDev
				>STYA pFD
				
.71				lda (pFD)				#S.FD.T
				tax
				jmp (.8,x)
				
.8				.DA STDIO.IOERR			REG
				.DA STDIO.IOERR			DIR
				.DA IO.OPEN.CDEV
				.DA IO.OPEN.BDEV
				.DA STDIO.IOERR			LNK
				.DA IO.OPEN.DSOCK
				.DA IO.OPEN.SSOCK
				.DA IO.OPEN.PIPE
.9				jmp IO.OPEN.REG
*/--------------------------------------
* # close
* ## C
* `int close(hFD fd);`
* ## ASM
* **In:**
* `lda fd`
* `>SYSCALL close`
*\--------------------------------------
K.Close			jsr IO.GetPFD

UNISTD.Close	lda (pFD)				#S.FD.T
				tax
				jmp (.1,x)
				
.1				.DA IO.CLOSE.REG
				.DA IO.CLOSE.DIR
				.DA IO.CLOSE.CDEV
				.DA IO.CLOSE.BDEV
				.DA STDIO.IOERR			LNK
				.DA IO.CLOSE.DSOCK
				.DA IO.CLOSE.SSOCK
				.DA IO.CLOSE.PIPE
*/--------------------------------------
* # read
* ## C
* `int read(hFD fd, void *buf, int count);`
* ## ASM
* **In:**
* `>PUSHWI count`
* `>PUSHW buf`
* `lda fd`
* `>SYSCALL read`
* ## RETURN VALUE
* CC: Y,A = bytes read
* CS: A = EC
*\--------------------------------------
K.Read			jsr IO.GetPFD
				
UNISTD.Read		lda (pFD)				#S.FD.T
				tax
				jmp (.1,x)
				
.1				.DA IO.READ.REG
				.DA STDIO.IOERR			DIR
				.DA IO.READ.CDEV
				.DA STDIO.IOERR			BDEV
				.DA STDIO.IOERR			LNK
				.DA STDIO.IOERR			DSOCK
				.DA IO.READ.SSOCK
				.DA IO.READ.PIPE
*/--------------------------------------
* # write
* ## C
* `int write(hFD fd, const void *buf, int count);`
* ## ASM
* **In:**
* `>PUSHWI count`
* `>PUSHW buf`
* `lda fd`
* `>SYSCALL write`
* ## RETURN VALUE
* CC: Y,A = bytes written
* CS: A = EC
*\--------------------------------------
K.Write			jsr IO.GetPFD

UNISTD.Write	lda (pFD)				#S.FD.T
				tax
				jmp (.1,x)
				
.1				.DA IO.WRITE.REG
				.DA STDIO.IOERR			DIR
				.DA IO.WRITE.CDEV
				.DA STDIO.IOERR			BDEV
				.DA STDIO.IOERR			LNK
				.DA STDIO.IOERR			DSOCK
				.DA IO.WRITE.SSOCK
				.DA IO.WRITE.PIPE
*--------------------------------------
MAN
SAVE USR/SRC/SYS/KERNEL.S.UNISTD
LOAD USR/SRC/SYS/KERNEL.S
ASM