sbfsFind counts a block's eight entries in SbfsCount and calls
sbfsMatchEntry for each one, and sbfsMatchEntry used the same variable for
its own twenty two byte comparison. A name differing at its first byte
returned without decrementing, leaving 22 in the entry counter, so the
search then walked twenty two entries through a buffer holding eight: off
the end of it, into whatever data happened to follow, matching against
rubbish and reporting a file that is not there as found.
It had always been there. What decided whether it looked like it worked
was the bytes after SbfsBuffer, so it stayed hidden until unrelated data
was added and changed them. It showed up as "dir" followed by any failed
"load" reporting that the file could not be read rather than that it does
not exist.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
A token is classified after its quotes have been stripped, so a string
literal reading "ADD" looked exactly like the ADD instruction and was
assembled as one. It failed with "attempting to assemble outside the
Program Segment", a message about a mistake nobody had made.
The literal and label checks were already guarded against strings and the
instruction check was not. Mnemonics match without regard to case, so
"or" and "and" were caught by this too, and those are ordinary enough
words to want in a message.
Third of its family, after a string beginning with '0' being read as a
malformed number and a string in the Program Segment being silently
discarded. All three have the same root.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The loadable program format's header has been in the working tree since
the loader was written and has never been in the repository: the gitignore
rules matched Source/Assembler as a directory, so it was silently
untracked. Anything cloning this repository could not build it, because
secondPass.c includes this file.
This is the failure the previous commit describes, having already happened
once without being noticed.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Without a leading slash a pattern matches at any depth, so the rules for
the three built binaries also matched directories: "Assembler" ignored
Source/Assembler. The files already in it stayed tracked, which is why
nothing had gone wrong yet, but a new source file added there would have
been silently untracked and left out of a commit.
Found by git refusing to stage a change to Source/Assembler/firstPass.c.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Overflowing/Underflowing A or B with increment or decrement instructions now sets the Carry Flag.
An increment or decrement of A or B that doesn't result in an overflow/underflow now clears the Carry Flag.
Q is no longer saved and restored in subroutine calls, allowing it to be used to return a one byte result.
Documentation updated with more detail.
Added DPUP and DPDN, which take a one byte operand specifying how far up or down to offset the Data Pointer.
Three Fibonacci generators using the print.asm library.
- 8 bit values printing in decimal representation.
- 16 bit values printing in hexadecimal representation.
- 32 bit values printing in hexadecimal representation.
AnachronautandClaude Opus 5
Anachronaut
albatross