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added iterative file loading to diskio

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This commit is contained in:
Irmen de Jong 2020-12-10 00:58:59 +01:00
parent 7a7270d769
commit b5dc5fc615
1 changed files with 51 additions and 1 deletions
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52
compiler/res/prog8lib/diskio.p8
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@ -59,7 +59,7 @@ io_error:
}
; internal variables for the iterative file lister
; internal variables for the iterative file lister / loader
ubyte list_suffixmatch
ubyte list_pattern_size
ubyte list_skip_disk_name
@ -68,6 +68,9 @@ io_error:
ubyte iteration_in_progress = false
str list_filename = "????????????????"
; ----- 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.
lf_end_list()
@ -171,6 +174,53 @@ close_end:
}
; ----- iterative file loader functions -----
sub f_open(ubyte drivenumber, uword filenameptr) -> ubyte {
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 #2 as input channel
if_cc
return true
}
f_close()
return false
}
sub f_read(uword bufferpointer, uword buffersize) -> uword {
if not iteration_in_progress
return 0
uword actual = 0
repeat buffersize {
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_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