prog8/compiler/res/prog8lib/diskio.p8

389 lines
11 KiB
Lua

%import textio
%import syslib
; Note: this code is compatible with C64 and CX16.
diskio {
sub directory(ubyte drivenumber) -> ubyte {
; -- Prints the directory contents of disk drive 8-11 to the screen. Returns success.
c64.SETNAM(1, "$")
c64.SETLFS(13, drivenumber, 0)
void c64.OPEN() ; open 13,8,0,"$"
if_cs
goto io_error
void c64.CHKIN(13) ; use #13 as input channel
if_cs
goto io_error
repeat 4 {
void c64.CHRIN() ; skip the 4 prologue bytes
}
; while not key pressed / EOF encountered, read data.
ubyte status = c64.READST()
while not status {
ubyte low = c64.CHRIN()
ubyte high = c64.CHRIN()
txt.print_uw(mkword(high, low))
txt.chrout(' ')
ubyte @zp char
repeat {
char = c64.CHRIN()
if char==0
break
txt.chrout(char)
}
txt.chrout('\n')
void c64.CHRIN() ; skip 2 bytes
void c64.CHRIN()
status = c64.READST()
if c64.STOP2()
break
}
io_error:
status = c64.READST()
c64.CLRCHN() ; restore default i/o devices
c64.CLOSE(13)
if status and status != 64 { ; 64=end of file
txt.print("\ni/o error, status: ")
txt.print_ub(status)
txt.chrout('\n')
return false
}
return true
}
; internal variables for the iterative file lister / loader
ubyte list_suffixmatch
ubyte list_pattern_size
ubyte list_skip_disk_name
uword list_pattern
uword list_blocks
ubyte iteration_in_progress = false
str list_filename = "?" * 32
; ----- get a list of files (uses iteration functions internally -----
sub list_files(ubyte drivenumber, uword pattern, ubyte suffixmatch, uword name_ptrs, ubyte max_names) -> ubyte {
; -- fill the array 'name_ptrs' with (pointers to) the names of the files requested.
uword names_buffer = memory("filenames", 512)
uword buffer_start = names_buffer
ubyte files_found = 0
if lf_start_list(drivenumber, pattern, suffixmatch) {
while lf_next_entry() {
@(name_ptrs) = lsb(names_buffer)
name_ptrs++
@(name_ptrs) = msb(names_buffer)
name_ptrs++
names_buffer += strcopy(diskio.list_filename, names_buffer) + 1
files_found++
if names_buffer - buffer_start > 512-18
break
if files_found == max_names
break
}
lf_end_list()
}
return files_found
}
; ----- iterative file lister functions -----
sub lf_start_list(ubyte drivenumber, uword pattern, ubyte suffixmatch) -> ubyte {
; -- start an iterative file listing with optional prefix or suffix name matching.
; note: only a single iteration loop can be active at a time!
lf_end_list()
list_pattern = pattern
list_suffixmatch = suffixmatch
list_skip_disk_name = true
iteration_in_progress = true
if pattern==0
list_pattern_size = 0
else
list_pattern_size = strlen(pattern)
c64.SETNAM(1, "$")
c64.SETLFS(12, drivenumber, 0)
void c64.OPEN() ; open 12,8,0,"$"
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
}
if c64.READST()==0
return true
io_error:
lf_end_list()
return false
}
sub lf_next_entry() -> ubyte {
; -- retrieve the next entry from an iterative file listing session.
; results will be found in list_blocks and list_filename.
; if it returns false though, there are no more entries (or an error occurred).
if not iteration_in_progress
return false
repeat {
void c64.CHKIN(12) ; use #12 as input channel again
uword nameptr = &list_filename
ubyte blocks_lsb = c64.CHRIN()
ubyte blocks_msb = c64.CHRIN()
if c64.READST()
goto close_end
list_blocks = mkword(blocks_msb, blocks_lsb)
; read until the filename starts after the first "
while c64.CHRIN()!='\"' {
if c64.READST()
goto close_end
}
; read the filename
repeat {
ubyte char = c64.CHRIN()
if char==0
break
if char=='\"'
break
@(nameptr) = char
nameptr++
}
@(nameptr) = 0
while c64.CHRIN() {
; read the rest of the entry until the end
}
void c64.CHRIN() ; skip 2 bytes
void c64.CHRIN()
if not list_skip_disk_name {
if list_pattern_size {
; do filename matching
if list_suffixmatch
rightstr(list_filename, filename, list_pattern_size)
else
leftstr(list_filename, filename, list_pattern_size)
if strcmp(filename, list_pattern)==0
return true
} else
return true
}
list_skip_disk_name = false
}
close_end:
lf_end_list()
return false
}
sub lf_end_list() {
; -- end an iterative file listing session (close channels).
if iteration_in_progress {
c64.CLRCHN()
c64.CLOSE(12)
iteration_in_progress = false
}
}
; ----- iterative file loader functions -----
sub f_open(ubyte drivenumber, uword filenameptr) -> ubyte {
; -- open a file for iterative reading with f_read
; note: only a single iteration loop can be active at a time!
f_close()
c64.SETNAM(strlen(filenameptr), filenameptr)
c64.SETLFS(11, drivenumber, 0)
void c64.OPEN() ; open 11,8,0,"filename"
if_cc {
iteration_in_progress = true
void c64.CHKIN(11) ; use #11 as input channel
if_cc
return true
}
f_close()
return false
}
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)
if not iteration_in_progress
return 0
uword actual = 0
void c64.CHKIN(11) ; use #11 as input channel again
repeat num_bytes {
ubyte data = c64.CHRIN()
@(bufferpointer) = data
bufferpointer++
actual++
ubyte status = c64.READST()
if status==64
f_close() ; end of file, close it
if status
return actual
}
return actual
}
sub f_read_exact(uword bufferpointer, uword num_bytes) {
; -- read from the currently open file, the given number of bytes. File must contain enough data!
; doesn't check for error conditions or end of file, to make the read as fast as possible.
if not iteration_in_progress
return
void c64.CHKIN(11) ; use #11 as input channel again
repeat num_bytes {
@(bufferpointer) = c64.CHRIN()
bufferpointer++
}
}
sub f_close() {
; -- end an iterative file loading session (close channels).
if iteration_in_progress {
c64.CLRCHN()
c64.CLOSE(11)
iteration_in_progress = false
}
}
sub status(ubyte drivenumber) -> uword {
; -- retrieve the disk drive's current status message
uword messageptr = &filename
c64.SETNAM(0, 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() {
@(messageptr) = c64.CHRIN()
messageptr++
}
io_error:
@(messageptr) = 0
c64.CLRCHN() ; restore default i/o devices
c64.CLOSE(15)
return filename
}
sub save(ubyte drivenumber, uword filenameptr, uword address, uword size) -> ubyte {
c64.SETNAM(strlen(filenameptr), filenameptr)
c64.SETLFS(1, drivenumber, 0)
uword end_address = address + size
%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
}}
ubyte result=0
if_cc
result = c64.READST()==0
c64.CLRCHN()
c64.CLOSE(1)
return result
}
sub load(ubyte drivenumber, uword filenameptr, uword address_override) -> uword {
c64.SETNAM(strlen(filenameptr), filenameptr)
ubyte secondary = 1
uword end_of_load = 0
if address_override
secondary = 0
c64.SETLFS(1, drivenumber, secondary)
%asm {{
stx P8ZP_SCRATCH_REG
lda #0
ldx address_override
ldy address_override+1
jsr c64.LOAD
bcs +
stx end_of_load
sty end_of_load+1
+ ldx P8ZP_SCRATCH_REG
}}
c64.CLRCHN()
c64.CLOSE(1)
if end_of_load
return end_of_load - address_override
return 0
}
str filename = "0:??????????????????????????????????????"
sub delete(ubyte drivenumber, uword filenameptr) {
; -- delete a file on the drive
ubyte flen = strlen(filenameptr)
filename[0] = 's'
filename[1] = ':'
memcopy(filenameptr, &filename+2, flen+1)
c64.SETNAM(flen+2, 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
ubyte flen_old = strlen(oldfileptr)
ubyte flen_new = strlen(newfileptr)
filename[0] = 'r'
filename[1] = ':'
memcopy(newfileptr, &filename+2, flen_new)
filename[flen_new+2] = '='
memcopy(oldfileptr, &filename+3+flen_new, flen_old+1)
c64.SETNAM(3+flen_new+flen_old, filename)
c64.SETLFS(1, drivenumber, 15)
void c64.OPEN()
c64.CLRCHN()
c64.CLOSE(1)
}
}