; int open(const char *name,int flags,...);
;
- .include "atari.inc"
- .include "fcntl.inc"
- .include "errno.inc"
- .include "fd.inc"
+ .include "atari.inc"
+ .include "fcntl.inc"
+ .include "errno.inc"
+ .include "fd.inc"
- .export _open
+ .export _open
.destructor closeallfiles, 5
- .import _close
- .import clriocb
- .import fddecusage,newfd
- .import findfreeiocb
- .import incsp4
- .import ldaxysp,addysp
- .import __oserror
- .importzp tmp4,tmp2
-.ifdef UCASE_FILENAME
- .importzp tmp3
- .import ucase_fn
+ .import _close
+ .import clriocb
+ .import fddecusage,newfd
+ .import findfreeiocb
+ .import incsp4
+ .import ldaxysp,addysp
+ .import __oserror
+ .importzp tmp4,tmp2
+.ifdef UCASE_FILENAME
+ .importzp tmp3
+ .import ucase_fn
.endif
-.proc _open
-
- dey ; parm count < 4 shouldn't be needed to be checked
- dey ; (it generates a c compiler warning)
- dey
- dey
- beq parmok ; parameter count ok
- jsr addysp ; fix stack, throw away unused parameters
-
-parmok: jsr findfreeiocb
- beq iocbok ; we found one
-
- lda #<EMFILE ; "too many open files"
-seterr: jsr __directerrno
- jsr incsp4 ; clean up stack
- lda #$FF
- tax
- rts ; return -1
-
- ; process the mode argument
-
-iocbok: stx tmp4
- jsr clriocb ; init with zero
- ldy #1
- jsr ldaxysp ; get mode
- ldx tmp4
- pha
- and #O_APPEND
- beq no_app
- pla
- and #15
- cmp #O_RDONLY ; DOS supports append with write-only only
- beq invret
- cmp #O_RDWR
- beq invret
- lda #OPNOT|APPEND
- bne set
-
-.ifndef UCASE_FILENAME
-invret: lda #<EINVAL ; file name is too long
- jmp seterr
+.proc _open
+
+ dey ; parm count < 4 shouldn't be needed to be checked
+ dey ; (it generates a c compiler warning)
+ dey
+ dey
+ beq parmok ; parameter count ok
+ jsr addysp ; fix stack, throw away unused parameters
+
+parmok: jsr findfreeiocb
+ beq iocbok ; we found one
+
+ lda #<EMFILE ; "too many open files"
+seterr: jsr __directerrno
+ jsr incsp4 ; clean up stack
+ lda #$FF
+ tax
+ rts ; return -1
+
+ ; process the mode argument
+
+iocbok: stx tmp4
+ jsr clriocb ; init with zero
+ ldy #1
+ jsr ldaxysp ; get mode
+ ldx tmp4
+ pha
+ and #O_APPEND
+ beq no_app
+ pla
+ and #15
+ cmp #O_RDONLY ; DOS supports append with write-only only
+ beq invret
+ cmp #O_RDWR
+ beq invret
+ lda #OPNOT|APPEND
+ bne set
+
+.ifndef UCASE_FILENAME
+invret: lda #<EINVAL ; file name is too long
+ jmp seterr
.endif
-no_app: pla
- and #15
- cmp #O_RDONLY
- bne l1
- lda #OPNIN
-set: sta ICAX1,x
- bne cont
+no_app: pla
+ and #15
+ cmp #O_RDONLY
+ bne l1
+ lda #OPNIN
+set: sta ICAX1,x
+ bne cont
-l1: cmp #O_WRONLY
- bne l2
- lda #OPNOT
- bne set
+l1: cmp #O_WRONLY
+ bne l2
+ lda #OPNOT
+ bne set
-l2: ; O_RDWR
- lda #OPNOT|OPNIN
- bne set
+l2: ; O_RDWR
+ lda #OPNOT|OPNIN
+ bne set
- ; process the filename argument
+ ; process the filename argument
-cont: ldy #3
- jsr ldaxysp
+cont: ldy #3
+ jsr ldaxysp
-.ifdef UCASE_FILENAME
+.ifdef UCASE_FILENAME
- jsr ucase_fn
- bcc ucok1
-invret: lda #<EINVAL ; file name is too long
- jmp seterr
+ jsr ucase_fn
+ bcc ucok1
+invret: lda #<EINVAL ; file name is too long
+ jmp seterr
ucok1:
-.endif ; defined UCASE_FILENAME
-
- ldy tmp4
-
- ;AX - points to filename
- ;Y - iocb to use, if open needed
- jsr newfd ; maybe we don't need to open and can reuse an iocb
- ; returns fd num to use in tmp2, all regs unchanged
- bcs doopen ; C set: open needed
- lda #0 ; clears N flag
- beq finish
-
-doopen: sta ICBAL,y
- txa
- sta ICBAH,y
- ldx tmp4
- lda #OPEN
- sta ICCOM,x
- jsr CIOV
-
- ; clean up the stack
-
-finish: php
- txa
- pha
- tya
- pha
-
-.ifdef UCASE_FILENAME
- ldy tmp3 ; get size
- jsr addysp ; free used space on the stack
-.endif ; defined UCASE_FILENAME
-
- jsr incsp4 ; clean up stack
-
- pla
- tay
- pla
- tax
- plp
-
- bpl ok
- jsr fddecusage ; decrement usage counter of fd as open failed
- tya ; put error code into A
- jmp __mappederrno
-
-ok: lda tmp2 ; get fd
- ldx #0
- stx __oserror
- rts
+.endif ; defined UCASE_FILENAME
+
+ ldy tmp4
+
+ ;AX - points to filename
+ ;Y - iocb to use, if open needed
+ jsr newfd ; maybe we don't need to open and can reuse an iocb
+ ; returns fd num to use in tmp2, all regs unchanged
+ bcs doopen ; C set: open needed
+ lda #0 ; clears N flag
+ beq finish
+
+doopen: sta ICBAL,y
+ txa
+ sta ICBAH,y
+ ldx tmp4
+ lda #OPEN
+ sta ICCOM,x
+ jsr CIOV
+
+ ; clean up the stack
+
+finish: php
+ txa
+ pha
+ tya
+ pha
+
+.ifdef UCASE_FILENAME
+ ldy tmp3 ; get size
+ jsr addysp ; free used space on the stack
+.endif ; defined UCASE_FILENAME
+
+ jsr incsp4 ; clean up stack
+
+ pla
+ tay
+ pla
+ tax
+ plp
+
+ bpl ok
+ jsr fddecusage ; decrement usage counter of fd as open failed
+ tya ; put error code into A
+ jmp __mappederrno
+
+ok: lda tmp2 ; get fd
+ ldx #0
+ stx __oserror
+ rts
.endproc
.proc closeallfiles
- lda #MAX_FD_INDEX-1
-loop: ldx #0
- pha
- jsr _close
- pla
- clc
- sbc #0
- bpl loop
- rts
+ lda #MAX_FD_INDEX-1
+loop: ldx #0
+ pha
+ jsr _close
+ pla
+ clc
+ sbc #0
+ bpl loop
+ rts
.endproc
projects / cc65 / blobdiff