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https://github.com/irmen/prog8.git
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added cx16diskio.f_seek() function to seek to a position in an opened file
f_open uses channel 12 now, f_open_w uses 13
This commit is contained in:
Irmen de Jong
parent
7ebcb219d6
commit
f870e4965a
@ -35,8 +35,8 @@ cx16diskio {
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return $2000 * (cx16.getrambank() - startbank) + endaddress - startaddress
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}
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asmsub vload(str name @R0, ubyte device @Y, ubyte bank @A, uword address @R1) -> ubyte @A {
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; -- like the basic command VLOAD "filename",device,bank,address
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asmsub vload(str name @R0, ubyte drivenumber @Y, ubyte bank @A, uword address @R1) -> ubyte @A {
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; -- like the basic command VLOAD "filename",drivenumber,bank,address
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; loads a file into Vera's video memory in the given bank:address, returns success in A
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; the file has to have the usual 2 byte header (which will be skipped)
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%asm {{
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@ -77,8 +77,8 @@ internal_vload:
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}}
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}
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asmsub vload_raw(str name @R0, ubyte device @Y, ubyte bank @A, uword address @R1) -> ubyte @A {
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; -- like the basic command BVLOAD "filename",device,bank,address
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asmsub vload_raw(str name @R0, ubyte drivenumber @Y, ubyte bank @A, uword address @R1) -> ubyte @A {
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; -- like the basic command BVLOAD "filename",drivenumber,bank,address
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; loads a file into Vera's video memory in the given bank:address, returns success in A
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; the file is read fully including the first two bytes.
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%asm {{
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@ -104,7 +104,7 @@ internal_vload:
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num_bytes--
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}
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void c64.CHKIN(11) ; use #11 as input channel again
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void c64.CHKIN(12) ; use #12 as input channel again
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; commander X16 supports fast block-read via macptr() kernal call
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uword size
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@ -191,7 +191,7 @@ m_in_buffer sta $ffff
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diskio.list_filename[1] = 'd'
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diskio.list_filename[2] = ':'
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void string.copy(path, &diskio.list_filename+3)
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void diskio.send_command(drivenumber, diskio.list_filename)
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diskio.send_command(drivenumber, diskio.list_filename)
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}
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sub mkdir(ubyte drivenumber, str name) {
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@ -200,7 +200,7 @@ m_in_buffer sta $ffff
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diskio.list_filename[1] = 'd'
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diskio.list_filename[2] = ':'
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void string.copy(name, &diskio.list_filename+3)
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void diskio.send_command(drivenumber, diskio.list_filename)
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diskio.send_command(drivenumber, diskio.list_filename)
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}
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sub rmdir(ubyte drivenumber, str name) {
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@ -212,7 +212,7 @@ m_in_buffer sta $ffff
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diskio.list_filename[1] = 'd'
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diskio.list_filename[2] = ':'
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void string.copy(name, &diskio.list_filename+3)
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void diskio.send_command(drivenumber, diskio.list_filename)
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diskio.send_command(drivenumber, diskio.list_filename)
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}
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sub relabel(ubyte drivenumber, str name) {
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@ -222,6 +222,33 @@ m_in_buffer sta $ffff
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diskio.list_filename[2] = 'h'
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diskio.list_filename[3] = ':'
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void string.copy(name, &diskio.list_filename+4)
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void diskio.send_command(drivenumber, diskio.list_filename)
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diskio.send_command(drivenumber, diskio.list_filename)
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}
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sub f_seek(uword pos_hiword, uword pos_loword) {
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; -- seek in the reading file opened with f_open, to the given 32-bits position
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ubyte[6] command = ['p',0,0,0,0,0]
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command[1] = 12 ; f_open uses channel 12
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command[2] = lsb(pos_loword)
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command[3] = msb(pos_loword)
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command[4] = lsb(pos_hiword)
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command[5] = msb(pos_hiword)
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send_command:
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c64.SETNAM(sizeof(command), &command)
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c64.SETLFS(15, diskio.last_drivenumber, 15)
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void c64.OPEN()
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c64.CLOSE(15)
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diskio.have_first_byte = false
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}
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; TODO see if we can get this to work as well:
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; sub f_seek_w(uword pos_hiword, uword pos_loword) {
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; ; -- seek in the output file opened with f_open_w, to the given 32-bits position
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; cx16diskio.f_seek.command[1] = 1 ; f_open_w uses secondary channel 1
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; cx16diskio.f_seek.command[2] = poslo
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; cx16diskio.f_seek.command[3] = posmidlo
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; cx16diskio.f_seek.command[4] = posmidhi
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; cx16diskio.f_seek.command[5] = poshi
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; goto cx16diskio.f_seek.send_command
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; }
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}
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@ -10,12 +10,12 @@ diskio {
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; -- Prints the directory contents of disk drive 8-11 to the screen. Returns success.
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c64.SETNAM(1, "$")
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c64.SETLFS(13, drivenumber, 0)
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c64.SETLFS(12, drivenumber, 0)
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ubyte status = 1
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void c64.OPEN() ; open 13,8,0,"$"
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void c64.OPEN() ; open 12,8,0,"$"
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if_cs
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goto io_error
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void c64.CHKIN(13) ; use #13 as input channel
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void c64.CHKIN(12) ; use #12 as input channel
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if_cs
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goto io_error
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@ -53,7 +53,7 @@ diskio {
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io_error:
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c64.CLRCHN() ; restore default i/o devices
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c64.CLOSE(13)
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c64.CLOSE(12)
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if status and status & $40 == 0 { ; bit 6=end of file
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txt.print("\ni/o error, status: ")
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@ -69,12 +69,12 @@ io_error:
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; -- Returns pointer to disk name string or 0 if failure.
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c64.SETNAM(1, "$")
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c64.SETLFS(13, drivenumber, 0)
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c64.SETLFS(12, drivenumber, 0)
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ubyte okay = false
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void c64.OPEN() ; open 13,8,0,"$"
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void c64.OPEN() ; open 12,8,0,"$"
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if_cs
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goto io_error
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void c64.CHKIN(13) ; use #13 as input channel
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void c64.CHKIN(12) ; use #12 as input channel
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if_cs
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goto io_error
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@ -96,7 +96,7 @@ io_error:
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io_error:
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c64.CLRCHN() ; restore default i/o devices
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c64.CLOSE(13)
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c64.CLOSE(12)
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if okay
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return &list_filename
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return 0
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@ -109,6 +109,7 @@ io_error:
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bool iteration_in_progress = false
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ubyte @zp first_byte
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bool have_first_byte
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ubyte last_drivenumber = 8 ; which drive was last used for a f_open operation?
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str list_filetype = "???" ; prg, seq, dir
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str list_filename = "?" * 50
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@ -249,7 +250,7 @@ close_end:
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}
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; ----- iterative file loader functions (uses io channel 11) -----
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; ----- iterative file loader functions (uses io channel 12) -----
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sub f_open(ubyte drivenumber, uword filenameptr) -> bool {
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; -- open a file for iterative reading with f_read
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@ -257,13 +258,14 @@ close_end:
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f_close()
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c64.SETNAM(string.length(filenameptr), filenameptr)
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c64.SETLFS(11, drivenumber, 0)
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void c64.OPEN() ; open 11,8,0,"filename"
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c64.SETLFS(12, drivenumber, 12) ; note: has to be 12,x,12 because otherwise f_seek doesn't work
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last_drivenumber = drivenumber
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void c64.OPEN() ; open 12,8,12,"filename"
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if_cc {
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if c64.READST()==0 {
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iteration_in_progress = true
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have_first_byte = false
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void c64.CHKIN(11) ; use #11 as input channel
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void c64.CHKIN(12) ; use #12 as input channel
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if_cc {
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first_byte = c64.CHRIN() ; read first byte to test for file not found
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if not c64.READST() {
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@ -294,7 +296,7 @@ close_end:
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num_bytes--
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}
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void c64.CHKIN(11) ; use #11 as input channel again
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void c64.CHKIN(12) ; use #12 as input channel again
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%asm {{
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lda bufferpointer
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@ -359,8 +361,8 @@ m_in_buffer sta $ffff
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%asm {{
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sta P8ZP_SCRATCH_W1
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sty P8ZP_SCRATCH_W1+1
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ldx #11
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jsr c64.CHKIN ; use channel 11 again for input
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ldx #12
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jsr c64.CHKIN ; use channel 12 again for input
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ldy #0
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lda have_first_byte
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beq _loop
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@ -389,23 +391,23 @@ _end rts
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; -- end an iterative file loading session (close channels).
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if iteration_in_progress {
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c64.CLRCHN()
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c64.CLOSE(11)
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c64.CLOSE(12)
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iteration_in_progress = false
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}
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}
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; ----- iterative file saver functions (uses io channel 14) -----
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; ----- iterative file writing functions (uses io channel 13) -----
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sub f_open_w(ubyte drivenumber, uword filenameptr) -> bool {
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; -- open a file for iterative writing with f_write
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f_close_w()
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c64.SETNAM(string.length(filenameptr), filenameptr)
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c64.SETLFS(14, drivenumber, 1)
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void c64.OPEN() ; open 14,8,1,"filename"
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c64.SETLFS(13, drivenumber, 1)
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void c64.OPEN() ; open 13,8,1,"filename"
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if_cc {
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void c64.CHKOUT(14) ; use #14 as output channel
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c64.CHKOUT(13) ; use #13 as output channel
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return not c64.READST()
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}
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f_close_w()
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@ -413,9 +415,9 @@ _end rts
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}
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sub f_write(uword bufferpointer, uword num_bytes) -> bool {
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; -- write the given umber of bytes to the currently open file
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; -- write the given number of bytes to the currently open file
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if num_bytes!=0 {
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void c64.CHKOUT(14) ; use #14 as output channel again
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c64.CHKOUT(13) ; use #13 as output channel again
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repeat num_bytes {
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c64.CHROUT(@(bufferpointer))
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bufferpointer++
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@ -428,7 +430,7 @@ _end rts
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sub f_close_w() {
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; -- end an iterative file writing session (close channels).
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c64.CLRCHN()
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c64.CLOSE(14)
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c64.CLOSE(13)
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}
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@ -102,6 +102,7 @@ class TestCompilerOnExamplesCx16: FunSpec({
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"cube3d",
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"datetime",
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"diskspeed",
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"fileseek",
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"highresbitmap",
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"kefrenbars",
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"keyboardhandler",
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@ -3,7 +3,11 @@ TODO
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For next release
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^^^^^^^^^^^^^^^^
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- get rid of diskio.have_first_byte. But detecting invalid filenames should still work.
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- diskio.f_read doesn't signal end of file condition if the requested number of bytes==1 ?
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- diskio.f_read doesn't work if used after seek with buffer too small?
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- ir/vm: check weird asm chunks appearing in block?
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- try to get the cx16 adpcm example to output audio
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- attempt to fix the expression codegen bug with reused temp vars (github #89)
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- AstIdentifiersChecker: can a subroutine really not have the same name as its enclosing block? 64tass problem?
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- 6502 codegen: make it possible to use cpu opcodes such as 'nop' as variable names by prefixing all asm vars with something such as ``p8v_``? Or not worth it (most 3 letter opcodes as variables are nonsensical anyway)
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85
examples/cx16/fileseek.p8
Normal file
85
examples/cx16/fileseek.p8
Normal file
@ -0,0 +1,85 @@
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; this program shows the use of the f_seek function to seek to a position in an opened file.
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; (this only works on Commander X16 DOS. on sdcard, not on host filesystem.)
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%import diskio
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%import cx16diskio
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%import textio
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%zeropage basicsafe
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%option no_sysinit
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main {
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str FILENAME = "seektestfile.bin"
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sub start() {
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txt.print("writing data file...\n")
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uword total=0
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diskio.delete(8, FILENAME)
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if diskio.f_open_w(8, FILENAME) {
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repeat 1000 {
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str text = "hello world."
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void diskio.f_write(text, string.length(text))
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total += string.length(text)
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}
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diskio.f_close_w()
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txt.print("written size=")
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txt.print_uw(total)
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txt.nl()
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} else {
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txt.print("error: ")
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txt.print(diskio.status(8))
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sys.exit(1)
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}
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read_last_bytes()
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; txt.print("\nseeking to 11992 and writing a few bytes...\n")
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; if diskio.f_open_w(8, FILENAME) {
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; cx16diskio.f_seek_w(0,0,msb(11992),lsb(11992))
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; txt.print(diskio.status(8))
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; txt.nl()
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; void diskio.f_write("123", 3)
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; diskio.f_close_w()
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; } else {
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; txt.print("error: ")
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; txt.print(diskio.status(8))
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; sys.exit(1)
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; }
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;
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; read_last_bytes()
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}
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sub read_last_bytes() {
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; read the last 10 bytes of the 12000 bytes file
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ubyte[256] buffer
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uword total = 0
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uword size
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txt.print("\nseeking to 11990 and reading...\n")
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if diskio.f_open(8, FILENAME) {
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cx16diskio.f_seek(0, 11990)
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do {
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size = diskio.f_read(buffer, sizeof(buffer))
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total += size
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} until size==0
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diskio.f_close()
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txt.print("size read=")
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txt.print_uw(total)
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txt.nl()
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buffer[lsb(total)] = 0
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txt.print("buffer read=")
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ubyte idx
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for idx in 0 to lsb(total-1) {
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txt.print_ubhex(buffer[idx], false)
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txt.spc()
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}
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txt.spc()
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txt.chrout('{')
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txt.print(buffer)
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txt.chrout('}')
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txt.nl()
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} else {
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txt.print("error: ")
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txt.print(diskio.status(8))
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sys.exit(1)
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}
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}
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}
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