prog8/compiler/res/prog8lib/diskio.p8

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%import textio
%import syslib
; Note: this code is compatible with C64 and CX16.
diskio {
sub directory(ubyte drivenumber) -> byte {
; -- Shows the directory contents of disk drive 8-11 (provide as argument).
c64.SETNAM(1, "$")
c64.SETLFS(1, drivenumber, 0)
void c64.OPEN() ; open 1,8,0,"$"
if_cs
goto io_error
void c64.CHKIN(1) ; use #1 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 {
txt.print_uw(mkword(c64.CHRIN(), c64.CHRIN()))
txt.chrout(' ')
ubyte @zp char
do {
char = c64.CHRIN()
txt.chrout(char)
} until char==0
txt.chrout('\n')
void c64.CHRIN() ; skip 2 bytes
void c64.CHRIN()
status = c64.READST()
void c64.STOP()
if_nz
break
}
io_error:
status = c64.READST()
c64.CLRCHN() ; restore default i/o devices
c64.CLOSE(1)
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
}
sub status(ubyte drivenumber) {
; -- display the disk drive's current status message
c64.SETNAM(0, $0000)
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()
txt.chrout(c64.CHRIN())
io_error:
c64.CLRCHN() ; restore default i/o devices
c64.CLOSE(15)
}
sub save(ubyte drivenumber, uword filenameptr, uword address, uword size) -> byte {
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
}}
if_cc
return c64.READST()==0
return false
}
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
}}
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)
ubyte fis_ix = flen_new+2 ; TODO is temp var for array indexing
filename[fis_ix] = '='
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)
}
}