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186 lines
3.9 KiB
ArmAsm
186 lines
3.9 KiB
ArmAsm
;
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; Christian Groessler, 2013-07-24
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;
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; unsigned char __fastcall__ _sysrename (const char* oldname, const char* newname);
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;
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.include "atari.inc"
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.import findfreeiocb
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.importzp tmp4, sp, ptr2, ptr3
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.import incsp2, subysp, addysp, popax
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.ifdef UCASE_FILENAME
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.importzp tmp3
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.import ucase_fn
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.ifdef DEFAULT_DEVICE
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.importzp tmp2
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.endif
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.endif
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.export __sysrename
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.proc __sysrename
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pha ; save input parameter
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txa
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pha
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jsr findfreeiocb
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beq iocbok ; we found one
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pla
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pla ; fix up stack
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jsr incsp2
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lda #TMOF ; too many open files
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rts
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iocbok: stx tmp4 ; remember IOCB index
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pla
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sta ptr2+1 ; remember newname
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pla
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sta ptr2 ; ditto.
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jsr popax ; get oldname
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ldy #0
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sty sspc+1 ; initialize stack space
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.ifdef UCASE_FILENAME
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; uppercase first (old) name and prepend device if needed
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.ifdef DEFAULT_DEVICE
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ldy #$80
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sty tmp2 ; set flag for ucase_fn
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.endif
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jsr ucase_fn
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bcc ucok1
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lda #183 ; see oserror.s
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rts
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ucok1: sta ptr3
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stx ptr3+1 ; remember pointer to uppercased old name
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lda tmp3 ; # of bytes reserved on the stack
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sta sspc ; remember...
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; uppercase second (new) name and don't prepend device
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.ifdef DEFAULT_DEVICE
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ldy #0
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sty tmp2 ; set flag for ucase_fn
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.endif
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lda ptr2
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ldx ptr2+1
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jsr ucase_fn
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bcc ucok2
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ldy tmp3 ; get size
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jsr addysp ; free used space on the stack
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lda #183 ; see oserror.s
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rts
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ucok2: sta ptr2 ; remember pointer to uppercased new name
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stx ptr2+1
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; update sspc -- # of bytes used on the stack
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lda sspc
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clc
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adc tmp3
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sta sspc
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bcc ukok4
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inc sspc+1
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ukok4:
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.else
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sta ptr3
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stx ptr3+1
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sty sspc
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.endif
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; create a string on the stack with the old filename and the new filename separated by an invalid character (space in our case)
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; ptr2 - pointer to new name
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; ptr3 - pointer to old name
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lda #128
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tay
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clc
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adc sspc
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sta sspc
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bcc L1
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inc sspc+1
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L1: jsr subysp ; make room on the stack
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; copy old name
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ldy #0
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con: lda (ptr3),y
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sta (sp),y
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beq copyend
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iny
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bne con
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copyend:lda #$20 ; space
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sta (sp),y
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iny
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tya ; get current offset (beyond old name)
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clc
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adc sp
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sta ptr3
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lda sp+1
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adc #0
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sta ptr3+1 ; ptr3 now contains pointer to space for new filename
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; copy new name
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ldy #0
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cnn: lda (ptr2),y
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sta (ptr3),y
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beq copend2
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iny
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bne cnn
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copend2:ldx tmp4
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lda sp
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sta ICBAL,x
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lda sp+1
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sta ICBAH,x
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lda #RENAME
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sta ICCOM,x
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lda #0
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sta ICAX1,x
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sta ICAX2,x
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sta ICBLL,x
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sta ICBLH,x
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jsr CIOV
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tya
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pha
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; clean up stack
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lda sp
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clc
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adc sspc
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sta sp
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lda sp+1
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adc sspc+1
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sta sp+1
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; handle status
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pla
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tay
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bmi cioerr
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lda #0
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rts
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cioerr: tya
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rts
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.endproc ; __sysrename
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.bss
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sspc: .res 2 ; stack space used
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