Commit Briefs
lib9: use opendir/readdir to read directories
getdirentries(2) has been deprecated on macOS since 10.5 (ten releases ago). Using it requires disabling 64-bit inodes, but that in turn makes binaries incompatible with some dynamic libraries, most notably ASAN. At some point getdirentries(2) will actually be removed. For both these reasons, switch to opendir/readdir. A little clunky since we have to keep the DIR* hidden away to preserve the int fd interfaces, but it lets us remove a bunch of OS-specific code too.
lib9: move seek into open.c
More preparation for opendir.
lib9: add close
More preparation for opendir.
lib9: merge create, open, dirread into open.c
Preparation for using opendir.
fmt: adjust GCC version check
atomics were added in GCC 4.9: https://gcc.gnu.org/gcc-4.9/changes.html
fmt: disable use of stdatomic on AIX XL C and old GCC
C11 is apparently too new for these systems. Fixes #55.
rc: allow unquoted = in command arguments
dd fans rejoice! Also helps with commands like go test -run=x.
rc: move free carat handling into parser
This fixes at least one shell script (printfont) that expected 'x'`{y}'z' to mean 'x'^`{y}^'z' as it now does. Before it meant: 'x'^`{y} 'z' One surprise is that adjacent lists get a free carat: (x y z)(1 2 3) is (x1 y2 z3) This doesn't affect any rc script in Plan 9 or plan9port.