gbos - a tiny Unix-flavored OS for the Game Boy Color (kernel, shell, coreutils in C, RAM filesystem) https://git.sl0p.foo/gbos.git/atom/usr/time.c?h=master 2026-09-24T21:08:46Z 2026-09-24T21:08:46Z user user@clank 2026-09-24T21:08:46Z urn:sha1:4bfe20f88b93645f9a277c9903620d75f0ddc179 - sort [-r] [-n]: everything in RAM, which bounds it - a task has 8 KiB and a file caps at 3 KiB, so 96 lines of 2400 bytes with room for the stack. Insertion sort over an index; at that size the simple thing is fast and costs far less ROM. `uniq -c f | sort -n -r` finally works. NB the key needs a scratch SLOT of its own: gt() compares table entries, so reusing slot i as scratch overwrites the entries being shifted into it. - cmp: reports the first differing byte, silent when the files match. There was no way to check a copy on the machine - you had to haul both to a host. - strings [-n N]: pairs with xxd now that /bin/<prog> is readable. It finds "gbos sm83 (Game Boy Color)" inside /bin/uname. - du [dir]: 256-byte blocks, the unit df and the filesystem use. Bytes overflow - /bin alone is 52 x 16 KiB, which wrapped a 16-bit counter and printed 32768. Recurses by re-opendir'ing, since the kernel keeps only one "directory being listed" cursor. - time CMD: 1/64 s resolution from the tick counter. It rebuilds the child's command line at $A000 - which is its own argument area, so everything is copied to the stack first.