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103 lines
2.1 KiB
ArmAsm
103 lines
2.1 KiB
ArmAsm
;
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; Christian Groessler, Dec-2001
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;
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; ucase_fn
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; helper routine to convert a string (file name) to uppercase
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; used by open.s and remove.s
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;
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; Calling parameters:
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; AX - points to filename
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; Return parameters:
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; C - 0/1 for OK/Error (filename too long)
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; AX - points to uppercased version of the filename on the stack
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; tmp3 - amount of bytes used on the stack (needed for cleanup)
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; Uses:
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; ptr4 - scratch pointer used to remember original AX pointer
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;
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;
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.include "atari.inc"
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.ifdef DEFAULT_DEVICE
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.importzp tmp2
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.import __defdev
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.endif
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.importzp tmp3,ptr4,sp
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.import subysp,addysp
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.export ucase_fn
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.proc ucase_fn
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; we make sure that the filename doesn't contain lowercase letters
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; we copy the filename we got onto the stack, uppercase it and use this
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; one to open the iocb
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; we're using tmp3, ptr4
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; save the original pointer
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sta ptr4
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stx ptr4+1
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.ifdef DEFAULT_DEVICE
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ldy #1
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sty tmp2 ; initialize flag: device present in passed string
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lda #':'
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cmp (ptr4),y
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beq hasdev
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iny
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cmp (ptr4),y
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beq hasdev
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sta tmp2 ; set flag: no device in passed string
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hasdev:
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.endif
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ldy #128
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sty tmp3 ; save size
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jsr subysp ; make room on the stack
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; copy filename to the temp. place on the stack, also uppercasing it
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ldy #0
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loop2: lda (ptr4),y
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sta (sp),y
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beq copy_end
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bmi L1 ; Not lowercase (also, invalid, should reject)
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cmp #'a'
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bcc L1 ; Not lowercase
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and #$DF ; make upper case char, assume ASCII chars
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sta (sp),y ; store back
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L1:
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iny
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bpl loop2 ; bpl: this way we only support a max. length of 127
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; Filename too long
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jsr addysp ; restore the stack
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sec ; indicate error
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rts
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copy_end:
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.ifdef DEFAULT_DEVICE
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lda tmp2
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cmp #1 ; was device present in passed string?
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beq hasdev2 ; yes, don't prepend something
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ldy #128+3 ; no, prepend "D:" (or other device)
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sty tmp3 ; adjust stack size used
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ldy #3
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jsr subysp ; adjust stack pointer
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dey
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cpdev: lda __defdev,y
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sta (sp),y ; insert device name, number and ':'
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dey
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bpl cpdev
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hasdev2:
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.endif
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; leave A and X pointing to the modified filename
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lda sp
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ldx sp+1
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clc ; indicate success
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rts
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.endproc
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