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197 lines
4.9 KiB
ArmAsm
197 lines
4.9 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 16.11.2002
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;
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; int open (const char* name, int flags, ...); /* May take a mode argument */
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;
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; Be sure to keep the value priority of closeallfiles lower than that of
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; closeallstreams (which is the high level C file I/O counterpart and must be
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; called before closeallfiles).
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.export _open
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.destructor closeallfiles, 5
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.import SETLFS, OPEN, CLOSE
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.import addysp, popax
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.import scratch, fnparse, fnaddmode, fncomplete, fnset
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.import opencmdchannel, closecmdchannel, readdiskerror
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.import fnunit, fnisfile
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.import _close
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.importzp sp, tmp2, tmp3
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.include "errno.inc"
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.include "fcntl.inc"
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.include "filedes.inc"
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;--------------------------------------------------------------------------
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; closeallfiles: Close all open files.
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.proc closeallfiles
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ldx #MAX_FDS-1
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loop: lda fdtab,x
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beq next ; Skip unused entries
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; Close this file
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txa
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pha ; Save current value of X
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ldx #0
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jsr _close
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pla
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tax
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; Next file
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next: dex
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bpl loop
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rts
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.endproc
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;--------------------------------------------------------------------------
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; _open
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.proc _open
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; Throw away any additional parameters passed through the ellipsis
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dey ; Parm count < 4 shouldn't be needed to be...
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dey ; ...checked (it generates a c compiler warning)
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dey
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dey
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beq parmok ; Branch if parameter count ok
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jsr addysp ; Fix stack, throw away unused parameters
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; Parameters ok. Pop the flags and save them into tmp3
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parmok: jsr popax ; Get flags
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sta tmp3
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; Get the filename from stack and parse it. Bail out if is not ok
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jsr popax ; Get name
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jsr fnparse ; Parse it
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cmp #0
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bne oserror ; Bail out if problem with name
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; Get a free file handle and remember it in tmp2
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jsr freefd
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lda #EMFILE ; Load error code
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bcs seterrno ; Jump in case of errors
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stx tmp2
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; Check the flags. We cannot have both, read and write flags set, and we cannot
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; open a file for writing without creating it.
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lda tmp3
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and #(O_RDWR | O_CREAT)
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cmp #O_RDONLY ; Open for reading?
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beq doread ; Yes: Branch
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cmp #(O_WRONLY | O_CREAT) ; Open for writing?
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beq flagsok
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; Invalid open mode
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lda #EINVAL
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; Error entry. Sets _errno, clears _oserror, returns -1
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seterrno:
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jmp __directerrno
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; Error entry: Close the file and exit. OS error code is in A on entry
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closeandexit:
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pha
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lda tmp2
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clc
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adc #LFN_OFFS
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jsr CLOSE
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ldx fnunit
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jsr closecmdchannel
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pla
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; Error entry: Set oserror and errno using error code in A and return -1
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oserror:jmp __mappederrno
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; If O_TRUNC is set, scratch the file, but ignore any errors
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flagsok:
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lda tmp3
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and #O_TRUNC
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beq notrunc
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jsr scratch
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; Complete the the file name. Check for append mode here.
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notrunc:
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lda tmp3 ; Get the mode again
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ldx #'a'
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and #O_APPEND ; Append mode?
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bne append ; Branch if yes
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ldx #'w'
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append: txa
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jsr fncomplete ; Add type and mode to the name
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; Setup the real open flags
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lda #LFN_WRITE
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bne common
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; Read bit is set. Add an 'r' to the name
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doread: lda #'r'
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jsr fnaddmode ; Add the mode to the name
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lda #LFN_READ
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; Common read/write code. Flags in A, handle in tmp2
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common: sta tmp3
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jsr fnset ; Set the file name
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lda tmp2
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clc
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adc #LFN_OFFS
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ldx fnunit
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ldy fnisfile ; Is this a standard file on disk?
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beq nofile ; Branch if not
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tay ; Use the LFN also as SA for files
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nofile: ; ... else use SA=0 (read)
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jsr SETLFS ; Set the file params
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jsr OPEN
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bcs oserror
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; Open the the drive command channel and read it
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ldx fnunit
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jsr opencmdchannel
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bne closeandexit
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ldx fnunit
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jsr readdiskerror
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bne closeandexit ; Branch on error
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; File is open. Mark it as open in the table
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ldx tmp2
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lda tmp3
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sta fdtab,x
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lda fnunit
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sta unittab,x ; Remember
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; Done. Return the handle in a/x
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txa ; Handle
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ldx #0
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stx __oserror ; Clear _oserror
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rts
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.endproc
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