prog8/compiler/res/prog8lib/diskio.p8

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; C64 and Cx16 disk drive I/O routines.
%import textio
%import string
%import syslib
diskio {
sub directory(ubyte drivenumber) -> bool {
; -- Prints the directory contents of disk drive 8-11 to the screen. Returns success.
c64.SETNAM(1, "$")
c64.SETLFS(12, drivenumber, 0)
ubyte status = 1
void c64.OPEN() ; open 12,8,0,"$"
if_cs
goto io_error
void c64.CHKIN(12) ; use #12 as input channel
if_cs
goto io_error
repeat 4 {
void c64.CHRIN() ; skip the 4 prologue bytes
}
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; while not stop key pressed / EOF encountered, read data.
status = c64.READST()
if status!=0 {
status = 1
goto io_error
}
while status==0 {
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ubyte low = c64.CHRIN()
ubyte high = c64.CHRIN()
txt.print_uw(mkword(high, low))
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txt.spc()
ubyte @zp char
repeat {
char = c64.CHRIN()
if char==0
break
txt.chrout(char)
}
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txt.nl()
void c64.CHRIN() ; skip 2 bytes
void c64.CHRIN()
status = c64.READST()
if c64.STOP2()
break
}
status = c64.READST()
io_error:
c64.CLRCHN() ; restore default i/o devices
c64.CLOSE(12)
if status and status & $40 == 0 { ; bit 6=end of file
txt.print("\ni/o error, status: ")
txt.print_ub(status)
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txt.nl()
return false
}
return true
}
sub diskname(ubyte drivenumber) -> uword {
; -- Returns pointer to disk name string or 0 if failure.
c64.SETNAM(1, "$")
c64.SETLFS(12, drivenumber, 0)
ubyte okay = false
void c64.OPEN() ; open 12,8,0,"$"
if_cs
goto io_error
void c64.CHKIN(12) ; use #12 as input channel
if_cs
goto io_error
repeat 6 {
void c64.CHRIN() ; skip the 6 prologue bytes
}
if c64.READST()!=0
goto io_error
cx16.r0 = &list_filename
repeat {
@(cx16.r0) = c64.CHRIN()
if @(cx16.r0)==0
break
cx16.r0++
}
okay = true
io_error:
c64.CLRCHN() ; restore default i/o devices
c64.CLOSE(12)
if okay
return &list_filename
return 0
}
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; internal variables for the iterative file lister / loader
bool list_skip_disk_name
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uword list_pattern
uword list_blocks
bool iteration_in_progress = false
ubyte last_drivenumber = 8 ; which drive was last used for a f_open operation?
str list_filetype = "???" ; prg, seq, dir
str list_filename = "?" * 50
; ----- get a list of files (uses iteration functions internally) -----
sub list_filenames(ubyte drivenumber, uword pattern_ptr, uword filenames_buffer, uword filenames_buf_size) -> ubyte {
; -- fill the provided buffer with the names of the files on the disk (until buffer is full).
; Files in the buffer are separeted by a 0 byte. You can provide an optional pattern to match against.
; After the last filename one additional 0 byte is placed to indicate the end of the list.
; Returns number of files (it skips 'dir' entries i.e. subdirectories).
; Also sets carry on exit: Carry clear = all files returned, Carry set = directory has more files that didn't fit in the buffer.
uword buffer_start = filenames_buffer
ubyte files_found = 0
if lf_start_list(drivenumber, pattern_ptr) {
while lf_next_entry() {
if list_filetype!="dir" {
filenames_buffer += string.copy(diskio.list_filename, filenames_buffer) + 1
files_found++
if filenames_buffer - buffer_start > filenames_buf_size-20 {
@(filenames_buffer)=0
lf_end_list()
sys.set_carry()
return files_found
}
}
}
lf_end_list()
}
@(filenames_buffer)=0
sys.clear_carry()
return files_found
}
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; ----- iterative file lister functions (uses io channel 12) -----
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sub lf_start_list(ubyte drivenumber, uword pattern_ptr) -> bool {
; -- start an iterative file listing with optional pattern matching.
; note: only a single iteration loop can be active at a time!
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lf_end_list()
list_pattern = pattern_ptr
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list_skip_disk_name = true
iteration_in_progress = true
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c64.SETNAM(1, "$")
c64.SETLFS(12, drivenumber, 0)
void c64.OPEN() ; open 12,8,0,"$"
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if_cs
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goto io_error
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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repeat 4 {
void c64.CHRIN() ; skip the 4 prologue bytes
}
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if c64.READST()==0
return true
io_error:
lf_end_list()
return false
}
sub lf_next_entry() -> bool {
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; -- retrieve the next entry from an iterative file listing session.
; results will be found in list_blocks, list_filename, and list_filetype.
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; if it returns false though, there are no more entries (or an error occurred).
if not iteration_in_progress
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return false
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repeat {
void c64.CHKIN(12) ; use #12 as input channel again
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uword nameptr = &list_filename
ubyte blocks_lsb = c64.CHRIN()
ubyte blocks_msb = c64.CHRIN()
if c64.READST()
goto close_end
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list_blocks = mkword(blocks_msb, blocks_lsb)
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; read until the filename starts after the first "
while c64.CHRIN()!='\"' {
if c64.READST()
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goto close_end
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}
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; read the filename
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repeat {
ubyte char = c64.CHRIN()
if char==0
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break
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if char=='\"'
break
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@(nameptr) = char
nameptr++
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}
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@(nameptr) = 0
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do {
cx16.r15L = c64.CHRIN()
} until cx16.r15L!=' ' ; skip blanks up to 3 chars entry type
list_filetype[0] = cx16.r15L
list_filetype[1] = c64.CHRIN()
list_filetype[2] = c64.CHRIN()
while c64.CHRIN() {
; read the rest of the entry until the end
}
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void c64.CHRIN() ; skip 2 bytes
void c64.CHRIN()
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if not list_skip_disk_name {
if not list_pattern
return true
if string.pattern_match(list_filename, list_pattern)
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return true
}
list_skip_disk_name = false
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}
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close_end:
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lf_end_list()
return false
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}
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sub lf_end_list() {
; -- end an iterative file listing session (close channels).
if iteration_in_progress {
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c64.CLRCHN()
c64.CLOSE(12)
iteration_in_progress = false
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}
}
; ----- iterative file loader functions (uses io channel 12) -----
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sub f_open(ubyte drivenumber, uword filenameptr) -> bool {
; -- open a file for iterative reading with f_read
; note: only a single iteration loop can be active at a time!
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f_close()
c64.SETNAM(string.length(filenameptr), filenameptr)
c64.SETLFS(12, drivenumber, 12) ; note: has to be 12,x,12 because otherwise f_seek doesn't work
last_drivenumber = drivenumber
void c64.OPEN() ; open 12,8,12,"filename"
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if_cc {
if c64.READST()==0 {
iteration_in_progress = true
void c64.CHKIN(12) ; use #12 as input channel
if_cc {
void c64.CHRIN() ; read first byte to test for file not found
if not c64.READST() {
c64.CLOSE(12) ; close file because we already consumed first byte
void c64.OPEN() ; re-open the file
void c64.CHKIN(12)
return true
}
}
}
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}
f_close()
return false
}
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sub f_read(uword bufferpointer, uword num_bytes) -> uword {
; -- read from the currently open file, up to the given number of bytes.
; returns the actual number of bytes read. (checks for End-of-file and error conditions)
; NOTE: on systems with banked ram (such as Commander X16) this routine DOES NOT
; automatically load into subsequent banks if it reaches a bank boundary!
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; Consider using cx16diskio.f_read() on X16.
if not iteration_in_progress or not num_bytes
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return 0
list_blocks = 0 ; we reuse this variable for the total number of bytes read
%asm {{
lda bufferpointer
sta m_in_buffer+1
lda bufferpointer+1
sta m_in_buffer+2
}}
while num_bytes {
if c64.READST() {
f_close()
if c64.READST() & $40 ; eof?
return list_blocks ; number of bytes read
return 0 ; error.
}
%asm {{
jsr c64.CHRIN
m_in_buffer sta $ffff
inc m_in_buffer+1
bne +
inc m_in_buffer+2
+
}}
list_blocks++
num_bytes--
}
return list_blocks ; number of bytes read
}
sub f_read_all(uword bufferpointer) -> uword {
; -- read the full contents of the file, returns number of bytes read.
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; Note: Consider using cx16diskio.f_read_all() on X16!
if not iteration_in_progress
return 0
uword total_read = 0
while not c64.READST() {
cx16.r0 = f_read(bufferpointer, 256)
total_read += cx16.r0
bufferpointer += cx16.r0
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}
return total_read
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}
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asmsub f_readline(uword bufptr @AY) clobbers(X) -> ubyte @Y {
; Routine to read text lines from a text file. Lines must be less than 255 characters.
; Reads characters from the input file UNTIL a newline or return character (or EOF).
; The line read will be 0-terminated in the buffer (and not contain the end of line character).
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; The length of the line is returned in Y. Note that an empty line is okay and is length 0!
; I/O error status should be checked by the caller itself via READST() routine.
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%asm {{
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
ldx #12
jsr c64.CHKIN ; use channel 12 again for input
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ldy #0
_loop jsr c64.CHRIN
sta (P8ZP_SCRATCH_W1),y
beq _end
iny
cmp #$0a
beq _line_end
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cmp #$0d
bne _loop
_line_end dey ; get rid of the trailing end-of-line char
lda #0
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sta (P8ZP_SCRATCH_W1),y
_end rts
}}
}
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sub f_close() {
; -- end an iterative file loading session (close channels).
if iteration_in_progress {
c64.CLRCHN()
c64.CLOSE(12)
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iteration_in_progress = false
}
}
; ----- iterative file writing functions (uses io channel 13) -----
sub f_open_w(ubyte drivenumber, uword filenameptr) -> bool {
; -- open a file for iterative writing with f_write
f_close_w()
c64.SETNAM(string.length(filenameptr), filenameptr)
c64.SETLFS(13, drivenumber, 1)
void c64.OPEN() ; open 13,8,1,"filename"
if_cc {
c64.CHKOUT(13) ; use #13 as output channel
return not c64.READST()
}
f_close_w()
return false
}
sub f_write(uword bufferpointer, uword num_bytes) -> bool {
; -- write the given number of bytes to the currently open file
if num_bytes!=0 {
c64.CHKOUT(13) ; use #13 as output channel again
repeat num_bytes {
c64.CHROUT(@(bufferpointer))
bufferpointer++
}
return not c64.READST()
}
return true
}
sub f_close_w() {
; -- end an iterative file writing session (close channels).
c64.CLRCHN()
c64.CLOSE(13)
}
; ---- other functions ----
sub status(ubyte drivenumber) -> uword {
; -- retrieve the disk drive's current status message
uword messageptr = &list_filename
c64.SETNAM(0, list_filename)
c64.SETLFS(15, drivenumber, 15)
void c64.OPEN() ; open 15,8,15
if_cs
goto io_error
void c64.CHKIN(15) ; use #15 as input channel
if_cs
goto io_error
while not c64.READST() {
cx16.r5L = c64.CHRIN()
if cx16.r5L=='\r' or cx16.r5L=='\n'
break
@(messageptr) = cx16.r5L
messageptr++
}
@(messageptr) = 0
done:
c64.CLRCHN() ; restore default i/o devices
c64.CLOSE(15)
return list_filename
io_error:
list_filename = "?disk error"
goto done
}
sub save(ubyte drivenumber, uword filenameptr, uword address, uword size) -> bool {
c64.SETNAM(string.length(filenameptr), filenameptr)
c64.SETLFS(1, drivenumber, 0)
uword @shared end_address = address + size
cx16.r0L = 0
%asm {{
lda address
sta P8ZP_SCRATCH_W1
lda address+1
sta P8ZP_SCRATCH_W1+1
stx P8ZP_SCRATCH_REG
lda #<P8ZP_SCRATCH_W1
ldx end_address
ldy end_address+1
jsr c64.SAVE
php
ldx P8ZP_SCRATCH_REG
plp
}}
if_cc
cx16.r0L = c64.READST()==0
c64.CLRCHN()
c64.CLOSE(1)
return cx16.r0L
}
; Use kernal LOAD routine to load the given program file in memory.
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; This is similar to Basic's LOAD "filename",drive / LOAD "filename",drive,1
; If you don't give an address_override, the location in memory is taken from the 2-byte file header.
; If you specify a custom address_override, the first 2 bytes in the file are ignored
; and the rest is loaded at the given location in memory.
; Returns the end load address+1 if successful or 0 if a load error occurred.
; NOTE: when the load is larger than 64Kb and/or spans multiple RAM banks
; (which is possible on the Commander X16), the returned size is not correct,
; because it doesn't take the number of ram banks into account.
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; Also consider using cx16diskio.load() instead on the Commander X16.
sub load(ubyte drivenumber, uword filenameptr, uword address_override) -> uword {
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return internal_load_routine(drivenumber, filenameptr, address_override, false)
}
; Use kernal LOAD routine to load the given file in memory.
; INCLUDING the first 2 bytes in the file: no program header is assumed in the file.
; This is different from Basic's LOAD instruction which always skips the first two bytes.
; The load address is mandatory.
; Returns the end load address+1 if successful or 0 if a load error occurred.
; NOTE: when the load is larger than 64Kb and/or spans multiple RAM banks
; (which is possible on the Commander X16), the returned size is not correct,
; because it doesn't take the number of ram banks into account.
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; Also consider using cx16diskio.load_raw() instead on the Commander X16.
sub load_raw(ubyte drivenumber, uword filenameptr, uword address) -> uword {
if sys.target==16 ; are we on commander X16?
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return internal_load_routine(drivenumber, filenameptr, address, true)
; fallback to reading the 2 header bytes separately
if not f_open(drivenumber, filenameptr)
return 0
cx16.r1 = f_read(address, 2)
f_close()
if cx16.r1!=2
return 0
address += 2
return load(drivenumber, filenameptr, address)
}
; Internal routine, only to be used on Commander X16 platform if headerless=true,
; because this routine uses kernal support for that to load headerless files.
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; On C64 it will always be called with headerless=false.
sub internal_load_routine(ubyte drivenumber, uword filenameptr, uword address_override, bool headerless) -> uword {
c64.SETNAM(string.length(filenameptr), filenameptr)
ubyte secondary = 1
cx16.r1 = 0
if address_override
secondary = 0
if headerless
secondary |= %00000010 ; activate cx16 kernal headerless load support
c64.SETLFS(1, drivenumber, secondary)
%asm {{
stx P8ZP_SCRATCH_REG
lda #0
ldx address_override
ldy address_override+1
jsr c64.LOAD
bcs +
stx cx16.r1
sty cx16.r1+1
+ ldx P8ZP_SCRATCH_REG
}}
c64.CLRCHN()
c64.CLOSE(1)
return cx16.r1
}
sub delete(ubyte drivenumber, uword filenameptr) {
; -- delete a file on the drive
list_filename[0] = 's'
list_filename[1] = ':'
ubyte flen = string.copy(filenameptr, &list_filename+2)
c64.SETNAM(flen+2, list_filename)
c64.SETLFS(1, drivenumber, 15)
void c64.OPEN()
c64.CLRCHN()
c64.CLOSE(1)
}
sub rename(ubyte drivenumber, uword oldfileptr, uword newfileptr) {
; -- rename a file on the drive
list_filename[0] = 'r'
list_filename[1] = ':'
ubyte flen_new = string.copy(newfileptr, &list_filename+2)
list_filename[flen_new+2] = '='
ubyte flen_old = string.copy(oldfileptr, &list_filename+3+flen_new)
c64.SETNAM(3+flen_new+flen_old, list_filename)
c64.SETLFS(1, drivenumber, 15)
void c64.OPEN()
c64.CLRCHN()
c64.CLOSE(1)
}
sub send_command(ubyte drivenumber, uword commandptr) {
; -- send a dos command to the drive
c64.SETNAM(string.length(commandptr), commandptr)
c64.SETLFS(15, drivenumber, 15)
void c64.OPEN()
c64.CLRCHN()
c64.CLOSE(15)
}
}