A2osX/SYS/KERNEL.S.UNISTD.txt

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2019-07-27 20:51:39 +00:00
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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
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bcs IO.OPEN.REG
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.1 lda K.MLI.PATH,x
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cmp IO.DEV.FIFO-1,x
bne IO.OPEN.REG
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dex
bne .1
*--------------------------------------
* /DEV/xxxxxx (CDEV,BDEV,LNK,DSOCK,SSOCK,PIPE)
*--------------------------------------
>LDYAI K.MLI.PATH+6 skip $/DEV/
jsr K.GetDevByName
bcc .7
ldx #2
.10 lda Nod.Table.hPath-2,x
beq .3
jsr K.GetMemPtr
>STYA ZPPtr1
ldy #0
.2 lda (ZPPtr1),y
iny
cmp K.MLI.PATH,y
bne .3
cmp #0 end of string ?
bne .2
lda Nod.Table.hFD-2,x return hFD
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jsr UNISTD.GetPFD
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bra .71
.3 inx
cpx #K.NOD.MAX+2
bne .10
lda #MLI.E.NODEV
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* sec
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rts no OF found
.7 stx IO.hDev
>STYA pFD
.71 lda (pFD) #S.FD.T
tax
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jmp (.8-4,x)
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.8
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* .DA STDIO.IOERR REG
* .DA STDIO.IOERR DIR
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.DA IO.OPEN.CDEV
.DA IO.OPEN.BDEV
.DA STDIO.IOERR LNK
.DA IO.OPEN.DSOCK
.DA IO.OPEN.SSOCK
.DA IO.OPEN.PIPE
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*--------------------------------------
IO.OPEN.REG >MLICALL MLIGETFILEINFO
bcc IO.OPEN.REG.E Already Exists
bit IO.Open.FLAGS Create if not exists ?
bpl IO.OPEN.RTS No, return MLI error
ldx #2 Yes, Create...
.1 lda IO.Open.TYPE,x
sta K.MLI.PARAMS+4,x File type,Aux type
dex
bpl .1
lda #S.FI.ST.STD
jsr IO.MLI.CREATE
bcs IO.OPEN.RTS
IO.OPEN.REG.E ldx #0
jsr IO.MkFD
bcs IO.OPEN.RTS
jsr IO.MLI.OPEN
bcs IO.OPEN.ERR
lda IO.Open.FLAGS
bit #O.WRONLY
beq .20 Write mode ?
and #O.APPEND Append ?
bne .11 yes, go to end of file
stz K.MLI.PARAMS+2
stz K.MLI.PARAMS+3
stz K.MLI.PARAMS+4
>MLICALL MLISETEOF no, reset size to 0
bra .21
.11 >MLICALL MLIGETEOF
bcs IO.OPEN.ERR
>MLICALL MLISETMARK
.21 bcs IO.OPEN.ERR
.20 lda IO.Open.FLAGS
and #O.TEXT Text Mode ?
beq .8
lda #$FF
sta K.MLI.PARAMS+2
lda #C.CR
sta K.MLI.PARAMS+3
>MLICALL MLINEWLINE
bcs IO.OPEN.ERR
.8 lda IO.hFD
IO.OPEN.RTS rts
IO.OPEN.ERR pha Save Error Code
lda IO.hFD
jsr K.Close
pla
sec
rts
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*/--------------------------------------
* # close
* ## C
* `int close(hFD fd);`
* ## ASM
* **In:**
* `lda fd`
* `>SYSCALL close`
*\--------------------------------------
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K.Close jsr UNISTD.GetPFD
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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
*\--------------------------------------
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K.Read jsr UNISTD.GetPFD
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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
*\--------------------------------------
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K.Write jsr UNISTD.GetPFD
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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
*--------------------------------------
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UNISTD.GetPFD sta IO.hFD
jsr K.GetMemPtr
>STYA pFD
rts
*--------------------------------------
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MAN
SAVE USR/SRC/SYS/KERNEL.S.UNISTD
LOAD USR/SRC/SYS/KERNEL.S
ASM