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2021-06-05ash: add process substitution in bash-compatibility modeRon Yorston
Process substitution is a Korn shell feature that's also available in bash and some other shells. This patch implements process substitution in ash when ASH_BASH_COMPAT is enabled. function old new delta argstr 1386 1522 +136 strtodest - 52 +52 readtoken1 3346 3392 +46 .rodata 183206 183250 +44 unwindredir - 28 +28 cmdloop 365 372 +7 static.spclchars 10 12 +2 cmdputs 380 367 -13 exitreset 86 69 -17 evalcommand 1754 1737 -17 varvalue 675 634 -41 ------------------------------------------------------------------------------ (add/remove: 2/0 grow/shrink: 5/4 up/down: 315/-88) Total: 227 bytes text data bss dec hex filename 953967 4219 1904 960090 ea65a busybox_old 954192 4219 1904 960315 ea73b busybox_unstripped v2: Replace array of file descriptors with a linked list. Include tests that were unaccountably omitted from v1. v3: Update linked list code to the intended version. v4: Change order of conditional code in cmdputs(). v5: Use existing popredir() mechanism to manage file descriptors. v6: Rebase to latest version of BusyBox ash. Reduce code churn. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>