Upstream commit:
Date: Wed, 4 Apr 2018 17:54:01 +0800
eval: Variable assignments on functions are no longer persistent
Dirk Fieldhouse <fieldhouse@gmx.net> wrote:
> In POSIX.1-2017 ("simultaneously IEEE Std 1003.1™-2017 and The Open
> Group Technical Standard Base Specifications, Issue 7")
> <http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_09>,
> we read under '2.9.1 Simple Commands'
>
> "Variable assignments shall be performed as follows:
> ...
> - If the command name is a standard utility implemented as a function
> (see XBD Utility), the effect of variable assignments shall be as if the
> utility was not implemented as a function.
> ...
> - If the command name is a function that is not a standard utility
> implemented as a function, variable assignments shall affect the current
> execution environment during the execution of the function. It is
> unspecified:
>
> * Whether or not the variable assignments persist after the
> completion of the function
>
> * Whether or not the variables gain the export attribute during
> the execution of the function
>
> * Whether or not export attributes gained as a result of the
> variable assignments persist after the completion of the function (if
> variable assignments persist after the completion of the function)"
POSIX used to require the current dash behaviour. However, you're
right that this is no longer the case.
This patch will remove the persistence of the variable assignment.
I have considered the exporting the variables during the function
execution but have decided against it because:
1) It makes the code bigger.
2) dash has never done this in the past.
3) You cannot use this portably anyway.
Reported-by: Dirk Fieldhouse <fieldhouse@gmx.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
function old new delta
evalcommand 1606 1635 +29
evalcase 313 317 +4
evalfun 280 268 -12
pushlocalvars 48 - -48
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(add/remove: 0/1 grow/shrink: 2/1 up/down: 33/-60) Total: -27 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Was printing initial "+" prefix for the assignment, that printing
"+ cmd"
then printing the expanded " v=VAL" string.
Delay printing of "+" prefix for the assignment to after expansion.
function old new delta
run_pipe 1883 1902 +19
builtin_eval 127 133 +6
expand_vars_to_list 1103 1106 +3
dump_cmd_in_x_mode 144 142 -2
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(add/remove: 0/0 grow/shrink: 3/1 up/down: 28/-2) Total: 26 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
The n > 0 check to prevent access to the last byte of non-existing argv[-1]
wasn't enough. Switched to making sure there are initialized (zero) bytes there.
A predictable testcase is rather hard to construct, unfortunately,
contents of memory depends on allocator behavior and whatnot.
function old new delta
o_save_ptr_helper 119 137 +18
expand_on_ifs 345 339 -6
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(add/remove: 0/0 grow/shrink: 1/1 up/down: 18/-6) Total: 12 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This necessitates switch from libc FILE api to a simple
homegrown replacement.
The change which fixes the bug here is the deleting of
restore_redirected_FILEs();
line. It was prematurely moving (restoring) script fd#3.
The fix is: we don't even _want_ to restore scrit fds,
we are perfectly fine with them being moved.
The only reason we tried to restore them is that FILE api
did not allow moving of FILE->fd.
function old new delta
refill_HFILE_and_getc - 93 +93
hfopen - 90 +90
hfclose - 66 +66
pseudo_exec_argv 591 597 +6
hush_main 1089 1095 +6
builtin_source 209 214 +5
save_fd_on_redirect 197 200 +3
setup_redirects 320 321 +1
fgetc_interactive 235 236 +1
i_peek_and_eat_bkslash_nl 99 97 -2
expand_vars_to_list 1103 1100 -3
restore_redirects 99 52 -47
fclose_and_forget 57 - -57
remember_FILE 63 - -63
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(add/remove: 3/2 grow/shrink: 6/3 up/down: 271/-172) Total: 99 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
o_free() made o_string NULL-initialized,
o_free_unsafe() did not bother reinitializing (expected caller to not need it).
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This wasn't an ash bug in dollar_altvalue9, it was hush bug (and bash!)
function old new delta
expand_one_var 2236 2254 +18
expand_vars_to_list 1097 1103 +6
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(add/remove: 0/0 grow/shrink: 2/0 up/down: 24/0) Total: 24 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
ash might be a bit buggy, need to investigate dollar_altvalue9 test
function old new delta
expand_one_var 1639 2236 +597
expand_variables 112 128 +16
expand_vars_to_list 1117 1097 -20
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(add/remove: 0/0 grow/shrink: 2/1 up/down: 613/-20) Total: 593 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This is necessary since expand_one_var() for ${var:+ARG} must create more than one
output word, and thus can't simply return a char*.
function old new delta
expand_one_var 1610 1643 +33
expand_vars_to_list 1139 1125 -14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 33/-14) Total: 19 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Go over the string only once.
function old new delta
encode_then_expand_string 126 105 -21
encode_then_expand_vararg 443 399 -44
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(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-65) Total: -65 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Kconfig-language.txt was deleted in commit 4fa499a17b back in 2006.
Move to docs/ as suggested by Xabier Oneca:
http://lists.busybox.net/pipermail/busybox/2014-May/080914.html
Also update references to it everywhere.
Signed-off-by: Kartik Agaram <akkartik@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Sun, 25 Mar 2018 16:38:00 +0800
expand: Fix buffer overflow in expandmeta
The native version of expandmeta allocates a buffer that may be
overrun for two reasons. First of all the size is 1 byte too small
but this is normally hidden because the minimum size is rounded
up to 2048 bytes. Secondly, if the directory level is deep enough,
any buffer can be overrun.
This patch fixes both problems by calling realloc when necessary.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
function old new delta
expmeta 517 635 +118
expandarg 990 996 +6
mklocal 288 290 +2
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(add/remove: 0/0 grow/shrink: 3/0 up/down: 126/0) Total: 126 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Upstream commit:
Date: Thu, 22 Mar 2018 21:41:24 +0800
parser: Allow newlines within parameter substitution
On Fri, Mar 16, 2018 at 11:27:22AM +0800, Herbert Xu wrote:
> On Thu, Mar 15, 2018 at 10:49:15PM +0100, Harald van Dijk wrote:
> >
> > Okay, it can be trivially modified to something that does work in other
> > shells (even if it were actually executed), but gets rejected at parse time
> > by dash:
> >
> > if false; then
> > : ${$+
> > }
> > fi
>
> That's just a bug in dash's parser with ${} in general, because
> it bombs out without the if clause too:
>
> : ${$+
> }
This patch fixes the parsing of newlines with parameter substitution.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Since we check for '\' anyway when we determine whether we can look ahead,
we can just check for *and handle* it there.
function old new delta
parse_stream 2751 2740 -11
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
newer bash does not drop it, most other shells too
function old new delta
unbackslash 39 57 +18
parse_stream 2753 2751 -2
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(add/remove: 0/0 grow/shrink: 1/1 up/down: 18/-2) Total: 16 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
