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While at it, change all "__asm__" to "asm"
Co-authored-by: canyie <31466456+canyie@users.noreply.github.com>
Signed-off-by: YU Jincheng <shana@zju.edu.cn>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
evaluate_string 988 1011 +23
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
evaluate_string 945 988 +43
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Patch adapted from Roberto A. Foglietta <roberto.foglietta@gmail.com>
work.
function old new delta
lookupvar 106 150 +44
evalfun 369 408 +39
ash_main 1218 1242 +24
varinit_data 156 168 +12
.rodata 104162 104172 +10
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(add/remove: 0/0 grow/shrink: 5/0 up/down: 129/0) Total: 129 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Commit fb7d6c89 from Harald van Dijk's gwsh variant of ash
(https://github.com/hvdijk/gwsh):
ignoreeof is documented as only having an effect for interactive shells,
but is implemented as having mostly the same effect for interactive
shells as for non-interactive shells. Change the implementation to match
the documentation.
Test case:
$SHELL -o ignoreeof /dev/null
function old new delta
cmdloop 359 361 +2
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(add/remove: 0/0 grow/shrink: 1/0 up/down: 2/0) Total: 2 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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When the user tries to exit an interactive shell with stopped jobs
present the shell issues a warning and only exits if the user
insists by trying to exit again.
This shouldn't apply to non-interactive shells.
Reported-by: Roberto A. Foglietta <roberto.foglietta@gmail.com>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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The ignoreeof option should prevent an interactive shell from
exiting on EOF. This hasn't worked in BusyBox ash since commit
727752d2d (ash: better fix for ash -c 'echo 5&' and ash -c 'sleep 5&'
with testcase).
Commit 3b4d04b77e (ash: input: Allow two consecutive calls to pungetc)
pulled in improved support for multiple calls to pungetc from dash,
thus rendering much of commit 727752d2d obsolete. Removing this old
code fixes the problem with ignoreeof.
function old new delta
__pgetc 605 587 -18
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(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-18) Total: -18 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Date: Wed, 27 May 2020 13:19:10 +1000
eval: Prevent recursive PS4 expansion
Yaroslav Halchenko <yoh@onerussian.com> wrote:
> I like to (ab)use PS4 and set -x for tracing execution of scripts.
> Reporting time and PID is very useful in this context.
>
> I am not 100% certain if bash's behavior (of actually running the command
> embedded within PS4 string, probably eval'ing it) is actually POSIX
> compliant, posh seems to not do that; but I think it is definitely not
> desired for dash to just stall:
>
> - the script:
> #!/bin/sh
> set -x
> export PS4='+ $(date +%T.%N) [$$] '
> echo "lets go"
> sleep 1
> echo "done $var"
>
> - bash:
> /tmp > bash --posix test.sh
> +export 'PS4=+ $(date +%T.%N) [$$] '
> +PS4='+ $(date +%T.%N) [$$] '
> + 09:15:48.982296333 [2764323] echo 'lets go'
> lets go
> + 09:15:48.987829613 [2764323] sleep 1
> + 09:15:49.994485037 [2764323] echo 'done '
> done
>
...
> - dash: (stalls it set -x)
> /tmp > dash test.sh
> +export PS4=+ $(date +%T.%N) [$$]
> ^C^C
This patch fixes the infinite loop caused by repeated expansions
of PS4.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Upstream commit:
Date: Wed, 27 May 2020 12:19:13 +1000
parser: Get rid of PEOA
PEOA is a special character used to mark an alias as being finished
so that we don't enter an infinite loop with nested aliases. It
complicates the parser because we have to ensure that it is skipped
where necessary and not copied to the resulting token text.
This patch removes it and instead delays the marking of aliases
until the second pgetc. This has the same effect as the current
PEOA code while keeping the complexities within the input code.
This adds ~32 bytes of global data:
function old new delta
__pgetc - 512 +512
freestrings - 95 +95
popfile 86 110 +24
pushstring 141 160 +19
basepf 76 84 +8
syntax_index_table 258 257 -1
S_I_T 30 28 -2
.rodata 104255 104247 -8
pgetc_without_PEOA 13 - -13
xxreadtoken 230 215 -15
popstring 158 120 -38
readtoken1 3110 3045 -65
pgetc 547 22 -525
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 3/7 up/down: 658/-667) Total: -9 bytes
text data bss dec hex filename
1043102 559 5020 1048681 100069 busybox_old
1043085 559 5052 1048696 100078 busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Upstream commit:
Date: Wed, 29 Apr 2020 00:19:59 +1000
parser: Fix alias expansion after heredoc or newlines
This script should print OK:
alias a="case x in " b=x
a
b) echo BAD;; esac
alias BEGIN={ END=}
BEGIN
cat <<- EOF > /dev/null
$(:)
EOF
END
: <<- EOF &&
$(:)
EOF
BEGIN
echo OK
END
However, because the value of checkkwd is either zeroed when it
shouldn't, or isn't zeroed when it should, dash currently gets
it wrong in every case.
This patch fixes it by saving checkkwd and zeroing it where needed.
function old new delta
readtoken 157 176 +19
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Adding previously skipped "readtoken1(pgetc_eatbnl(), syntax_type..." change
from upstream commit:
Date: Thu Mar 8 08:37:11 2018 +0100
parser: use pgetc_eatbnl() in more places
dash has a pgetc_eatbnl function in parser.c which skips any
backslash-newline combinations. It's not used everywhere it could be.
There is also some duplicated backslash-newline handling elsewhere in
parser.c. Replace most of the calls to pgetc() with calls to
pgetc_eatbnl() and remove the duplicated backslash-newline handling.
Testcase:
PS1='\
:::'
should result in ::: prompt, not <newline>::: prompt
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Upstream commit:
Date: Sun, 17 May 2020 23:36:25 +1000
parser: Save and restore heredoclist in expandstr
On Sun, May 17, 2020 at 01:19:28PM +0100, Harald van Dijk wrote:
> This still does not restore the state completely. It does not clean up any
> pending heredocs. I see:
>
> $ PS1='$(<<EOF "'
> src/dash: 1: Syntax error: Unterminated quoted string
> $(<<EOF ":
> >
>
> That is, after entering the ':' command, the shell is still trying to read
> the heredoc from the prompt.
This patch saves and restores the heredoclist in expandstr.
It also removes a bunch of unnecessary volatiles as those variables
are only referenced in case of a longjmp other than one started by
a signal like SIGINT.
function old new delta
expandstr 268 255 -13
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Upstream commit:
Date: Tue, 28 Apr 2020 01:15:26 +1000
parser: Fix handling of empty aliases
Dash was incorrectly handling empty aliases. When attempting to use an
empty alias with nothing else, I'm (incorrectly) prompted for more
input:
```
$ alias empty=''
$ empty
>
```
Other shells (e.g., bash, yash) correctly handle the lone, empty alias as an
empty command:
```
$ alias empty=''
$ empty
$
```
The problem here is that we incorrectly enter the loop eating TNLs
in readtoken(). This patch fixes it by setting checkkwd correctly.
function old new delta
list 351 355 +4
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
parse_and_run_string 40 62 +22
i_getch 105 102 -3
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(add/remove: 0/0 grow/shrink: 1/1 up/down: 22/-3) Total: 19 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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The var_LINENO3.tests fails for hush: it does start from 0, but does not increment.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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From larger patch by Roberto A. Foglietta <roberto.foglietta@gmail.com>
function old new delta
evalfun 348 369 +21
ash_main 1202 1218 +16
setinputstring 65 73 +8
lookupvar 116 106 -10
evaltree 772 753 -19
evalsubshell 192 173 -19
evalfor 175 156 -19
evalcase 273 254 -19
evalcommand 1560 1536 -24
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(add/remove: 0/0 grow/shrink: 3/6 up/down: 45/-110) Total: -65 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Upsteam commit:
Date: Mon, 17 May 2021 15:19:23 +0800
eval: Do not cache value of eflag in evaltree
Patrick Brünn <P.Bruenn@beckhoff.com> wrote:
> Since we are migrating to Debian bullseye, we discovered a new behavior
> with our scripts, which look like this:
>>cleanup() {
>> set +e
>> rmdir ""
>>}
>>set -eu
>>trap 'cleanup' EXIT INT TERM
>>echo 'Hello world!'
>
> With old dash v0.5.10.2 this script would return 0 as we expected it.
> But since commit 62cf6955f8abe875752d7163f6f3adbc7e49ebae it returns
> the last exit code of our cleanup function.
...
Thanks for the report. This is actually a fairly old bug with
set -e that's just been exposed by the exit status change. What's
really happening is that cleanup itself is triggering a set -e
exit incorrectly because evaltree cached the value of eflag prior
to the function call.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Upstream commit:
Date: Thu, 4 Jun 2020 21:53:55 +1000
eval: Check nflag in evaltree instead of cmdloop
This patch moves the nflag check from cmdloop into evaltree. This
is so that nflag will be in force even if we enter the shell via a
path other than cmdloop, e.g., through sh -c.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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While at it, stop incrementing LINENO inside traps
function old new delta
evaltree 567 762 +195
evalfun 268 348 +80
trapcmd 286 333 +47
dotrap 129 157 +28
exitshell 120 139 +19
readtoken1 3096 3110 +14
nlprompt 25 39 +14
nlnoprompt 19 33 +14
.rodata 104245 104255 +10
forkchild 610 617 +7
optletters_optnames 64 68 +4
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(add/remove: 0/0 grow/shrink: 11/0 up/down: 432/0) Total: 432 bytes
Signed-off-by: Roberto A. Foglietta <roberto.foglietta@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Stacy Harper reports that this script:
test() { . /tmp/bb_test; }
echo "export TEST=foo" >/tmp/bb_test
test 2>/dev/null
echo "$TEST"
correctly prints 'foo' in BusyBox 1.33 but hangs in 1.34.
Bisection suggested the problem was caused by commit a1b0d3856 (ash: add
process substitution in bash-compatibility mode). Removing the call to
unwindredir() in cmdloop() introduced in that commit makes the script
work again.
Additionally, these examples of process substitution:
while true; do cat <(echo hi); done
f() { while true; do cat <(echo hi); done }
f
result in running out of file descriptors. This is a regression from
v5 of the process substitution patch caused by changes to evalcommand()
not being transferred to v6.
function old new delta
static.pushredir - 99 +99
evalcommand 1729 1750 +21
exitreset 69 86 +17
cmdloop 372 365 -7
unwindredir 28 - -28
pushredir 112 - -112
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(add/remove: 1/2 grow/shrink: 2/1 up/down: 137/-147) Total: -10 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
expand_one_var 2507 2502 -5
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
expand_one_var 2353 2507 +154
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
parse_dollar_squote - 441 +441
encode_then_expand_vararg 359 380 +21
parse_stream 2252 2271 +19
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/0 up/down: 481/0) Total: 481 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
subevalvar 1447 1457 +10
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
subevalvar 1353 1447 +94
.rodata 104179 104184 +5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 99/0) Total: 99 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Let's adopt Herbert Xu's patch, not waiting for it to reach dash git:
hush already has a similar fix.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
change_attributes 326 416 +90
list_attributes 222 248 +26
close_silently 22 - -22
.rodata 103722 103692 -30
fgetsetversion 74 - -74
fgetsetprojid 107 - -107
fgetsetflags 148 - -148
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(add/remove: 0/4 grow/shrink: 2/1 up/down: 116/-381) Total: -265 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Entering "${1a}" into interactive shell was making it exit.
function old new delta
parse_dollar 824 958 +134
i_getch_and_eat_bkslash_nl - 44 +44
parse_expr 917 938 +21
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(add/remove: 1/0 grow/shrink: 2/0 up/down: 199/0) Total: 199 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
done_pipe 213 231 +18
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
parse_stream 2238 2252 +14
encode_string 243 256 +13
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(add/remove: 0/0 grow/shrink: 2/0 up/down: 27/0) Total: 27 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
packed_usage 33552 33541 -11
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
packed_usage 33589 33552 -37
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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On Sat, Feb 9, 2019 Cristian Ionescu-Idbohrn wrote:
> In my case (at work), I have to watch and prevent people from doing
> unportable things. For me, that's a burden.
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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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>
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The original commit 3bef5d89b0 introduced an additional check
for an unset `opt_d` before doing word splitting. I'm unsure
why it's there in the first place, but the commit message also
describes a different behaviour than what -d actually does in
bash, while the code mostly does the right thing.
`opt_d` sets the line delimiter for read to stop reading and
should not affect word splitting.
Testcase:
$ echo qwe rty | { read -d Z a b; echo a:$a b:$b; }
a:qwe b:rty
function old new delta
shell_builtin_read 1314 1304 -10
Signed-off-by: Eicke Herbertz <wolletd@posteo.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
fgetc_interactive 227 244 +17
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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"In function 'sprint_status48':
error: format not a string literal and no format arguments"
function old new delta
sprint_status48 160 158 -2
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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function old new delta
fputs_stdout - 12 +12
zxc_vm_process 7237 7230 -7
yes_main 85 78 -7
write_block 380 373 -7
wrapf 305 298 -7
strings_main 437 430 -7
show_bridge 353 346 -7
rev_main 384 377 -7
put_prompt_custom 58 51 -7
put_cur_glyph_and_inc_cursor 168 161 -7
print_numbered_lines 152 145 -7
print_named_ascii 130 123 -7
print_name 135 128 -7
print_login_issue 386 379 -7
print_ascii 208 201 -7
powertop_main 1249 1242 -7
od_main 1789 1782 -7
logread_main 518 511 -7
head_main 804 797 -7
display_process_list 1319 1312 -7
cut_main 1002 995 -7
bb_dump_dump 1550 1543 -7
bb_ask_noecho 393 386 -7
baseNUM_main 702 695 -7
expand_main 755 745 -10
dumpleases_main 497 487 -10
write1 12 - -12
putcsi 37 23 -14
print_login_prompt 55 41 -14
paste_main 525 511 -14
cat_main 440 426 -14
print_it 245 230 -15
print_addrinfo 1188 1171 -17
print_rule 770 750 -20
print_linkinfo 842 822 -20
httpd_main 791 771 -20
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 0/34 up/down: 12/-341) Total: -329 bytes
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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