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diskio.f_readline() now also returns I/O status as secondary return value in A

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This commit is contained in:
Irmen de Jong 2024-07-06 22:25:01 +02:00
parent 484677b4b1
commit 69f953fd9b
4 changed files with 17 additions and 6 deletions
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9
compiler/res/prog8lib/cx16/diskio.p8
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@ -379,6 +379,7 @@ m_in_buffer sta $ffff
; optimized for Commander X16 to use MACPTR block read kernal call
sub f_read_all(uword bufferpointer) -> uword {
; -- read the full contents of the file, returns number of bytes read.
; It is assumed the file size is less than 64 K.
; NOTE: cannot be used to load into VRAM. Use vload() or call cx16.MACPTR() yourself with the vera data register as address.
if not iteration_in_progress
return 0
@ -393,12 +394,12 @@ m_in_buffer sta $ffff
return total_read
}
asmsub f_readline(uword bufptr @AY) clobbers(X) -> ubyte @Y {
asmsub f_readline(uword bufptr @AY) clobbers(X) -> ubyte @Y, ubyte @A {
; 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).
; 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.
; The I/O error status byte is returned in A.
%asm {{
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
@ -415,7 +416,8 @@ _loop jsr cbm.CHRIN
_line_end dey ; get rid of the trailing end-of-line char
lda #0
sta (P8ZP_SCRATCH_W1),y
_end rts
_end jsr cbm.READST
rts
}}
}
@ -467,6 +469,7 @@ _end rts
sub f_write(uword bufferpointer, uword num_bytes) -> bool {
; -- write the given number of bytes to the currently open file
; you can call this multiple times to append more data
if num_bytes!=0 {
reset_write_channel()
do {

8
compiler/res/prog8lib/diskio.p8
View File

@ -333,6 +333,7 @@ m_in_buffer sta $ffff
sub f_read_all(uword bufferpointer) -> uword {
; -- read the full contents of the file, returns number of bytes read.
; It is assumed the file size is less than 64 K.
if not iteration_in_progress
return 0
@ -346,12 +347,13 @@ m_in_buffer sta $ffff
return total_read
}
asmsub f_readline(uword bufptr @AY) clobbers(X) -> ubyte @Y {
asmsub f_readline(uword bufptr @AY) clobbers(X) -> ubyte @Y, ubyte @A {
; 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).
; 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.
; The I/O error status byte is returned in A.
%asm {{
sta P8ZP_SCRATCH_W1
sty P8ZP_SCRATCH_W1+1
@ -368,7 +370,8 @@ _loop jsr cbm.CHRIN
_line_end dey ; get rid of the trailing end-of-line char
lda #0
sta (P8ZP_SCRATCH_W1),y
_end rts
_end jsr cbm.READST
rts
}}
}
@ -405,6 +408,7 @@ _end rts
sub f_write(uword bufferpointer, uword num_bytes) -> bool {
; -- write the given number of bytes to the currently open file
; you can call this multiple times to append more data
if num_bytes!=0 {
reset_write_channel()
repeat num_bytes {

4
compiler/res/prog8lib/virtual/diskio.p8
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@ -72,6 +72,7 @@ diskio {
sub f_read_all(uword bufferpointer) -> uword {
; -- read the full contents of the file, returns number of bytes read.
; It is assumed the file size is less than 64 K.
txt.print("@TODO: f_read_all\n")
return 0
}
@ -81,7 +82,7 @@ diskio {
; 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).
; 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.
; This routine is not able here to return the status as well in a secondary return value, so you have to do that yourself.
txt.print("@TODO: f_readline\n")
return 0
}
@ -107,6 +108,7 @@ diskio {
sub f_write(uword bufferpointer, uword num_bytes) -> bool {
; -- write the given number of bytes to the currently open file
; you can call this multiple times to append more data
txt.print("@TODO: f_write\n")
return false
}

2
docs/source/todo.rst
View File

@ -3,6 +3,8 @@ TODO
See open issues on github.
Re-generate the skeleons doc files.
IR: add SEC and CLC instructions in place of call to sys.set_carry() and sys.clear_carry(). (check more inline sub calls that should be a single instruction?)
optimize signed byte/word division by powers of 2 (and shift right?), it's now using divmod routine. (also % ?)