millfork/docs/stdlib/cbm_file.md

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cbm_file

The cbm_file module provides support for loading and saving files to tape and disk. Currently, it works only for Commodore 64 targets, although support for more targets is coming. It uses Kernal routines, so it requires the Kernal ROM to be enabled.

byte last_used_device()

Returns the last device number, or 8 if none.

void load_file(byte device, pointer name)

Loads a PRG file with the given null-terminated name to the address specified in the file. Sets errno.

void load_file_at(byte device, pointer name, pointer addr)

Loads a PRG file with the given null-terminated name to the given address. Sets errno.

void save_file(byte device, pointer name, pointer start, word length)

Saves length bytes starting from start to a PRG file named name on device device. Sets errno.

void exec_disk(byte device, pointer command)

Executes a CBM DOS command on the given drive.

void delete_file(byte device, pointer name)

Deletes the given file in the given drive. (S0:)

void rename_file(byte device, pointer old_name, pointer new_name)

Renames the given file in the given drive. (R0:)

void copy_file(byte device, pointer old_name, pointer new_name)

Copies given file in the given drive. (C0:)

void initialize_disk(byte device)

Reinitialized disk status in the given drive. (I0)

void validate_disk(byte device)

Validates disk status in the given drive. (V0)

void format_disk(byte device)

Formats disk status in the given drive. (N0:)

void open_file(byte device, pointer name, byte fd, byte mode)

Opens a file. Sets errno.
TODO: buggy.

const byte MODE_READ = 0

const byte MODE_WRITE = 1

void close_file(byte fd)

Closes the given file. Sets errno.
TODO: buggy.

byte getbyte_safe()

Reads a byte from file. Sets errno to err_eof when reading the last byte, so don't abort reading when getting errno != err_ok.
TODO: buggy.

void putbyte_safe(byte b)

Writes a byte from file. Sets errno.
TODO: buggy.