gbos.git - gbos - a tiny Unix-flavored OS for the Game Boy Color (kernel, shell, coreutils in C, RAM filesystem)

	Commit message (Collapse)	Author	Files	Lines
4 days	refactor: c/ -> usr/, compiled program blobs out of the source tree	user	1	-0/+0
	Userland sources live in usr/ (fits the Unix theme better than 'c'). SDCC output .bin blobs land in build/usr/ with the other build artifacts instead of littering the source dir; programs.asm INCBINs them from there. Byte-identical ROM.
5 days	fs: reject open()/read() on a directory (EISDIR)	user	1	-2/+2
	open() now checks the target's inode type: opening a directory as a file returns $FE (EISDIR) instead of a valid fd, so 'cat docs' no longer streams the raw directory block as bytes. cat reports 'is a directory'; wc/head/save treat any invalid fd (>3) as an open failure. (ls is unaffected - it uses the structural opendir/list path, not open/getb.)
6 days	filesystem: a RAM FS (WRAMX) + ls/cat/save/rm; wc/head read files	user	1	-7/+14
	- fs.asm: 8-slot RAM filesystem in WRAMX ($D000-$DFFF), name[8]+len[2]+data[502]; syscalls open/close/getb/putb/list/remove, seeded with a 'readme' at boot. - libc: open/close/fgetc/fputc/flist/fremove wrappers + O_READ/O_WRITE/NOFD. - tools: ls, save (stdin->file, one line), rm; cat/wc/head now take a file arg. - fix: syscall dispatch clobbers A, so putb takes its byte in E (was reading the handler's low address byte, 0xDC); ls NUL-terminates 8-char names. - verified: save/cat/ls/rm cycle; wc readme -> '2 7 38'; head -n 1 readme. - README: document the filesystem + the A-clobber ABI note.
6 days	libc: option parsing (hasflag/optval); wc -l/-w/-c, head -n N	user	1	-9/+14
	- hasflag(argv,argc,f): single-char flag present (-f or within -abc) - optval(argv,argc,opt): value for -opt (-n 5 or -n5) - wc supports -l/-w/-c (default all); head supports -n N (and bare N)
6 days	tools: wc, head, and an argc/argv demo (args) + libc.c helpers	user	1	-0/+20
	- c/libc.c: shared C helpers linked into every program - putu (print decimal), atou (parse decimal), argv_parse (tokenize getargs() into argc/argv). - wc: count lines/words/chars of stdin. head [n]: first n lines (drains rest to EOF). args: argc/argv demo. - pid now uses libc putu; build.sh links libc.c; Makefile CBLOBS + libc dep. - README: document the new tools + argv_parse. - verified: 'args one two three' -> argc=3/argv[..]; wc '2 3 16'; head 2.