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ash: add process substitution in bash-compatibility mode

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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>
This commit is contained in:
Ron Yorston 2020-07-23 08:32:27 +01:00 • committed by Denys Vlasenko
parent 8c1f8aa016
commit a1b0d3856d
4 changed files with 187 additions and 17 deletions
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2
include/platform.h
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@ -426,6 +426,8 @@ typedef unsigned smalluint;
#define HAVE_SYS_STATFS_H 1
#define HAVE_PRINTF_PERCENTM 1
#define HAVE_WAIT3 1
#define HAVE_DEV_FD 1
#define DEV_FD_PREFIX "/dev/fd/"
#if defined(__UCLIBC__)
# if UCLIBC_VERSION < KERNEL_VERSION(0, 9, 32)