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124 lines
3.0 KiB
ArmAsm
124 lines
3.0 KiB
ArmAsm
;
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; Colin Leroy-Mira, 2023 <colin@colino.net>
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;
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; int __fastcall__ statvfs(const char *pathname, struct statvfs *statvfsbuf);
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;
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.export _statvfs
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.import _dio_query_sectsize
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.import mli_file_info, pushax, popax, popptr1, pushptr1
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.include "zeropage.inc"
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.include "apple2.inc"
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.include "errno.inc"
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.include "mli.inc"
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.include "statvfs.inc"
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_statvfs:
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; Store statbuf
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sta ptr4
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stx ptr4+1
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; Clear statbuf
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lda #$00
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ldy #.sizeof(statvfs)-1
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: sta (ptr4),y
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dey
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bpl :-
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; Store pathname, keeping only volume name
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jsr popptr1
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ldy #$00
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sty vol_sep
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lda (ptr1),y
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cmp #'/' ; Is the path absolute?
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beq :+
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lda #EINVAL
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jmp ___directerrno
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: iny
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lda (ptr1),y
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beq :+ ; End of string, no other /
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cpy #FILENAME_MAX
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beq :+ ; Max filename length reached
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cmp #'/'
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bne :- ; Not a slash, keep looking
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sty vol_sep ; Register '/' index
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lda #$00
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sta (ptr1),y ; Cut pathname at first slash
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: jsr pushptr1
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jsr mli_file_info
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php
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ldy vol_sep ; Put slash back in pathname
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lda #'/'
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sta (ptr1),y
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plp
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bcc got_info
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jmp ___mappederrno
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got_info:
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; f_fsid
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lda DEVNUM
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lsr ; Shift right to cc65 representation
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lsr
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lsr
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lsr
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ldy #statvfs::f_fsid
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sta (ptr4),y
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; total number of blocks
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lda mliparam + MLI::INFO::AUX_TYPE
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ldy #statvfs::f_blocks
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sta (ptr4),y
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lda mliparam + MLI::INFO::AUX_TYPE+1
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iny
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sta (ptr4),y
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; blocks free & avail
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sec
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lda mliparam + MLI::INFO::AUX_TYPE
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sbc mliparam + MLI::INFO::BLOCKS
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ldy #statvfs::f_bfree
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sta (ptr4),y
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ldy #statvfs::f_bavail
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sta (ptr4),y
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lda mliparam + MLI::INFO::AUX_TYPE+1
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sbc mliparam + MLI::INFO::BLOCKS+1
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iny
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sta (ptr4),y
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ldy #statvfs::f_bfree+1
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sta (ptr4),y
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; block sizes
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jsr _dio_query_sectsize
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; low bytes
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ldy #statvfs::f_bsize
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sta (ptr4),y
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ldy #statvfs::f_frsize
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sta (ptr4),y
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; f_frsize high byte
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iny
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txa
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sta (ptr4),y
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; f_bsize high byte
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ldy #statvfs::f_bsize+1
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sta (ptr4),y
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; f_namemax
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lda #FILENAME_MAX
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ldy #statvfs::f_namemax
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sta (ptr4),y
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lda #$00
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sta ___errno
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tax
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rts
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.bss
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vol_sep:.res 1
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