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moved getfd and fdt_to_fdi functions and fd_table into getfd file; moved

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fd_table defines to fd.inc


git-svn-id: svn://svn.cc65.org/cc65/trunk@400 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cpg 2000-10-29 00:05:06 +00:00
parent b6c09c5acb
commit 3c71bcdb58
1 changed files with 3 additions and 83 deletions
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86
libsrc/atari/fdtable.s
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@ -5,45 +5,15 @@
;
.include "atari.inc"
.include "fd.inc"
.importzp tmp1,tmp2,tmp3,ptr4,sp
.import subysp,addysp
.import fd_table,fd_index
.import fdt_to_fdi
.export fdtoiocb
.export fdtoiocb_down
.export fd_table
.export fddecusage
.export newfd
.export getfd
.export ___fd_table,___fd_index ; for test(debug purposes only
.data
MAX_FD_INDEX = 12
___fd_index:
fd_index: ; fd number is index into this table, entry's value specifies the fd_table entry
.res MAX_FD_INDEX,$ff
___fd_table:
fd_table: ; each entry represents an open iocb
.byte 0,0,'E',0 ; system console, app starts with opened iocb #0 for E:
.byte 0,$ff,0,0
.byte 0,$ff,0,0
.byte 0,$ff,0,0
.byte 0,$ff,0,0
.byte 0,$ff,0,0
.byte 0,$ff,0,0
.byte 0,$ff,0,0
MAX_FD_VAL = (* - fd_table) / 4
ft_entrylen = 4 ; length of table entry (it's not sufficient to change here!
; the code sometimes does two bit shifts to multiply/divide by
; this length)
ft_usa = 0 ; usage counter
ft_iocb = 1 ; iocb index (0,$10,$20,etc.), $ff for empty entry
ft_dev = 2 ; device of open iocb (0 - device not remembered, eg. filename specified)
ft_flag = 3 ; flags
; lower 3 bits: device number (for R: and D:)
.code
@ -367,53 +337,3 @@ finish: lda ptr4
.endproc
; ftp_to_fdi
; returns a fd_index entry pointing to the given ft_table entry
; get fd_table entry in A
; return C = 0/1 for OK/error
; return fd_index entry in A if OK
; registers destroyed
.proc fdt_to_fdi
tay
lda #$ff
tax
inx
loop: cmp fd_index,x
beq found
inx
cpx #MAX_FD_INDEX
bcc loop
rts
found: tya
sta fd_index,x
txa
clc
rts
.endproc
; getfd
; get a new fd pointing to a ft_table entry
; usage counter of ft_table entry incremented
; A - fd_table entry
; return C = 0/1 for OK/error
; returns fd in A if OK
; registers destroyed, tmp1 destroyed
.proc getfd
sta tmp1 ; save fd_table entry
jsr fdt_to_fdi
bcs error
pha
lda tmp1
asl a
asl a ; also clears C
tax
inc fd_table+ft_usa,x ; increment usage counter
pla
error: rts
.endproc