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* dash: Stop this stat64 nonsenseJune McEnroe2022-01-21
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* dash: Just zero mailsize on changemailJune McEnroe2022-01-21
| | | | | So that on start (and any time MAIL/MAILPATH change), any non-empty mailboxes will be reported.
* dash: Fix chkmail loop break conditionJune McEnroe2022-01-21
| | | | | padvance_magic() returns -1 when there are no more paths left, not zero.
* dash: Check sizes of mailboxes, not timesJune McEnroe2022-01-21
| | | | | | This fixes "you have mail" showing right after checking and deleting mail, resulting in a modified but empty mailbox. Also somehow fixes "you have mail" always showing 3(!) times.
* dash: Warn twice about stopped jobsJune McEnroe2022-01-21
| | | | | | Not really sure why this previously set job_warning to 2 rather than 1. Anyway I often just press ^D again after the warning without really thinking, so do it twice.
* dash: Set H_SETUNIQUEJune McEnroe2022-01-21
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* dash: Fix multi-line prompts when right prompts are usedJune McEnroe2022-01-21
| | | | | | editline does not render a multi-line PS1 correctly when RPS1 is also set. To work around this, return only the last line of the cached prompt to editline, and print the leading lines separately inside setprompt.
* dash: Add RPS1 and RPS2 right prompt variablesJune McEnroe2022-01-21
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* dash: Cache the expanded prompt for editlineJune McEnroe2022-01-21
| | | | | | | | | | | | | | | | | | | Previously, the prompt would be expanded every time editline called the getprompt callback. I think the code may have been written assuming that editline only calls getprompt once per prompt, but it may actually call it many times, for instance every time you type backspace. This results not only in slower editing from expanding complex prompts repeatedly, it also consumes more and more stack memory each time getprompt is called. This can be seen by setting PS1 to some command substitution, typing many characters at the prompt, then holding backspace and observing memory usage. Thankfully all this stack memory is freed between prompts by the stackmark calls around el_gets. This change causes prompt expansion to always happen in the setprompt call, as it would when editline is disabled, and a cached copy of the prompt is saved for getprompt to return every time editline calls it. Since getprompt is no longer doing expansion, the stackmark calls surrounding el_gets can be removed.
* dash: Bind libedit's secret filename completion functionJune McEnroe2022-01-21
| | | | | | | | | | Check if the FreeBSD (and by extension macOS) _el_fn_sh_complete version of the function exists, which does shell escaping of completed filenames before _el_fn_complete learned to. Tab is bound after calling el_set() and el_source() since the default bindings set tab to something else, and it should always be filename completion in the shell.
* dash: Replace autotools with cmakeJune McEnroe2022-01-21
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* parser: Fix VSLENGTH parsing with trailing garbageHerbert Xu2021-09-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Sat, Jun 19, 2021 at 02:44:46PM +0200, Denys Vlasenko wrote: > > CTLVAR and CTLBACKQ are not properly handled if encountered > inside {$#...}. Testcase: > > dash -c "`printf 'echo ${#1\x82}'`" 00 111 222 > > It should execute "echo ${#1 <byte 0x82> }" and thus print "3" > (the length of $1, which is "111"). > > Instead, it segfaults. > > (Ideally, it should fail since "1 <byte 0x82>" is not a valid > variable name, but currently dash accepts e.g. "${#1abc}" > as if it is "${#1}bc". A separate, less serious bug...). In fact these two bugs are one and the same. This patch fixes both by detecting the invalid substitution and not emitting it into the node tree. Incidentally this reveals a bug in how we parse ${#10} that got introduced recently, which is also fixed here. Reported-by: Denys Vlasenko <vda.linux@googlemail.com> Fixes: 7710a926b321 ("parser: Only accept single-digit parameter...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Do not cache value of eflag in evaltreeHerbert Xu2021-06-04
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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: >>#!/bin/sh >>cleanup() { >> set +e^M >> 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. > Reverting that commit gives a merge conflict, but it seems to fix _our_ > problem. As that topic appears too complex to us I want to ask the > experts here: > > Is this change in behavior intended, by dash? > > Our workaround at the moment would be: >>trap 'cleanup || true' EXIT INT TERM 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. This patch should fix the problem. Reported-by: Patrick Brünn <P.Bruenn@beckhoff.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Tested-by: Patrick Brünn <P.Bruenn@beckhoff.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* jobs: Only block in waitcmd on first runHerbert Xu2020-12-23
| | | | | | | | | | | | This patch ensures that waitcmd never blocks unless there are outstanding jobs. This could otherwise trigger a hang if children were created prior to the shell coming into existence, or if there are backgrounded children of other kinds (e.g., a here- document). Fixes: 6c691b3e5099 ("jobs: Only clear gotsigchld when waiting...") Reported-by: Michael Biebl <biebl@debian.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* jobs: Fix waitcmd busy loopHerbert Xu2020-07-08
| | | | | | | | | | | | We need to clear gotsigchld in waitproc because it is used as a loop conditional for the waitcmd case. Without it waitcmd may busy loop after a SIGCHLD. This patch also changes gotsigchld into a volatile sig_atomic_t to prevent compilers from optimising its accesses away. Fixes: 6c691b3e5099 ("jobs: Only clear gotsigchld when waiting...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Fix double-backslash nl in old-style command subHerbert Xu2020-06-01
| | | | | | | | | | | | | When handling backslashes within an old-style command substitution, we should not call pgetc_eatbnl because that would treat the next backslash character as another escape character if it was then followed by a new-line. This patch fixes it by calling pgetc. Reported-by: Matt Whitlock <dash@mattwhitlock.name> Fixes: 6bbc71d84bea ("parser: use pgetc_eatbnl() in more places") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: Fix typosMartin Michlmayr2020-05-28
| | | | | Signed-off-by: Martin Michlmayr <tbm@cyrius.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Save and restore heredoclist in expandstrHerbert Xu2020-05-28
| | | | | | | | | | | | | | | | | | | | | | | | 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. Reported-by: Harald van Dijk <harald@gigawatt.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: Always use explicit large file APIHerbert Xu2020-05-15
| | | | | | | | | There are some remaining stat/readdir calls in dash that may lead to spurious EOVERFLOW errors on 32-bit platforms. This patch changes them (as well as open(2)) to use the explicit large file API. Reported-by: Tatsuki Sugiura <sugi@nemui.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* input: Fix compiling against libedit with -fno-commonJeroen Roovers2020-05-15
| | | | | | | | | | | | | | With -fno-common, which will be enabled by default in GCC 10, we see this error: ld: input.o:(.bss+0x0): multiple definition of `el'; histedit.o:(.bss+0x8): first defined here To fix this, simply remove the definition as it is not needed. Signed-off-by: Jeroen Roovers <jer@gentoo.org> Signed-off-by: Mike Gilbert <floppym@gentoo.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: mktokens relative TMPDIRMichael Greenberg2020-05-15
| | | | | | | | | | | | | | | | The mktokens script fails when /tmp isn't writable (e.g., when building in a sandbox with a different TMPDIR). Replace absolute references to /tmp to relative references to TMPDIR. If TMPDIR is unset or null, default to /tmp. The mkbuiltins script was already hardened to work relative to TMPDIR, also defaulting to /tmp. v2 ensures that TMPDIR is quoted. v3 adds an extra quotation that prevents extra pathname expansions. Signed-off-by: Michael Greenberg <michael.greenberg@pomona.edu> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Remove unused expandmeta() flag parameterDenys Vlasenko2020-05-15
| | | | | Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Fix alias expansion after heredoc or newlinesHerbert Xu2020-05-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 && $(:) EOF BEGIN echo OK END However, because the value of checkkwd is either zeroed when it shouldn't, or isn't zeroed when it should, dash currently gets it wrong in every case. This patch fixes it by saving checkkwd and zeroing it where needed. Suggested-by: Harald van Dijk <harald@gigawatt.nl> Reported-by: Harald van Dijk <harald@gigawatt.nl> Reported-by: Martijn Dekker <martijn@inlv.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Catch errors in expandstrHerbert Xu2020-05-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | On Fri, Dec 13, 2019 at 02:51:34PM +0000, Simon Ser wrote: > Just noticed another dash bug: when setting invalid PS1 values dash > enters an infinite loop. > > For instance, setting PS1='$(' makes dash print many of these: > > dash: 1: Syntax error: end of file unexpected (expecting ")") > > It would be nice to fallback to the default PS1 value on error. This patch fixes it by using the literal value of PS1 should an error occur during expansion. On Wed, Feb 26, 2020 at 09:12:04PM +0000, Ron Yorston wrote: > > There's another case that should be handled. PS1='`xxx(`' causes the > shell to exit because the old-style backquote leaves an additional file > on the stack. Ron's change has been folded into this patch. Reported-by: Simon Ser <contact@emersion.fr> Reported-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Fix handling of empty aliasesHerbert Xu2020-05-15
| | | | | | | | | | | | | | | | | | | | | | | | | | | 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. Reported-by: Michael Greenberg <michael.greenberg@pomona.edu> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* jobs: Fix infinite loop in waitprocHerbert Xu2020-04-29
| | | | | | | | | | | | | | | | | | After we changed the resetting of gotsigchld so that it is only done if jp is NULL, we can now get an infinite loop in waitproc if gotsigchld is set but there is no outstanding child because everything had been waited for previously without gotsigchld being zeroed. This patch fixes it by always zeroing gotsigchld as we did before. The bug that the previous patch was trying to fix is now resolved by switching the blocking mode to DOWAIT_NORMAL after the specified job has been completed so that we really do wait for all outstanding dead children. Reported-by: Harald van Dijk <harald@gigawatt.nl> Fixes: 6c691b3e5099 ("jobs: Only clear gotsigchld when waiting...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* var: Remove poplocalvars() always-zero argument, make it staticDenys Vlasenko2020-04-29
| | | | | Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* jobs: Rename DOWAIT_NORMAL to DOWAIT_NONBLOCKDenys Vlasenko2020-04-29
| | | | | | | To make it clearer what it is doing: nonblocking wait() Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: Fix seconds part of times(1)Herbert Xu2020-04-29
| | | | | | | | | | | The seconds part of the times(1) built-in is wrong as it does not exclude the minutes part of the result. This patch fixes it. This problem was first noted by Michael Greenberg who also sent a similar patch. Reported-by: Michael Greenberg <michael.greenberg@pomona.edu> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* redir: Clear saved redirections in subshellHerbert Xu2020-04-29
| | | | | | | | | | | | | | | | | | | | | When we enter a subshell we need to drop the saved redirections as otherwise a subsequent unwindredir could produce incorrect results. This patch does this by simply clearing redirlist. While we could actually free the memory underneath for subshells it isn't really worth the trouble for now. In order to ensure that this is done in every place where we enter a subshell, this patch adds a new mkinit hook called forkreset. The calls closescript, clear_traps and reset_handler are also added to the forkreset hook. This fixes a bug where the first two functions weren't called if we enter a subshell without forking. Reported-by: Harald van Dijk <harald@gigawatt.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Only accept single-digit parameter expansion outside of bracesHerbert Xu2020-01-20
| | | | | | | | | | | | | | | | | | | | | | | | | On Thu, Apr 25, 2019 at 01:39:52AM +0000, Michael Orlitzky wrote: > The POSIX spec says, > > The parameter name or symbol can be enclosed in braces, which are > optional except for positional parameters with more than one digit or > when parameter is a name and is followed by a character that could be > interpreted as part of the name. > > However, dash seems to diverge from that behavior when we get to $10: > > $ cat test.sh > echo $10 > > $ dash ./test.sh one two three four five six seven eight nine ten > ten > > $ bash ./test.sh one two three four five six seven eight nine ten > one0 This patch should fix the problem. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Fix trailing newlines processing in backquote expandingNikolai Merinov2020-01-20
| | | | | | | | | | | | | | | | | | | According to POSIX.1-2008 we should remove newlines only at the end of the substitution. Newlines-only substitions causes dash to remove newlines before beggining of the substitution. The following code: cat <<END 1 $(echo "") 2 END prints "1<newline>2" instead of expected "1<newline><newline>2". This patch fixes trailing newlines processing in backquote expanding. Signed-off-by: Nikolai Merinov <n.merinov@inango-systems.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Fix old-style command substitution here-document crashHerbert Xu2020-01-20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Wed, Jul 25, 2018 at 12:38:27PM +0000, project-repo wrote: > Hi, > I am working on a project in which I use the honggfuzz fuzzer to fuzz open > source software and I decided to fuzz dash. In doing so I discovered a > NULL pointer dereference in src/redir.ch on line 305. Following is a > backtrace as supplied by the address sanitizer: > > AddressSanitizer:DEADLYSIGNAL > ================================================================= > ==39623==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000010 (pc 0x0000005768ed bp 0x7ffc00273df0 sp 0x7ffc00273c60 T0) > ==39623==The signal is caused by a READ memory access. > ==39623==Hint: address points to the zero page. > #0 0x5768ec in openhere /home/jfe/dash/src/redir.c:305:29 > #1 0x574d92 in openredirect /home/jfe/dash/src/redir.c:230:7 > #2 0x5737fe in redirect /home/jfe/dash/src/redir.c:121:11 > #3 0x576017 in redirectsafe /home/jfe/dash/src/redir.c:424:3 > #4 0x522326 in evalcommand /home/jfe/dash/src/eval.c:828:11 > #5 0x520010 in evaltree /home/jfe/dash/src/eval.c:288:12 > #6 0x5270da in evaltreenr /home/jfe/dash/src/eval.c:332:2 > #7 0x526f04 in evalbackcmd /home/jfe/dash/src/eval.c:640:3 > #8 0x539020 in expbackq /home/jfe/dash/src/expand.c:522:2 > #9 0x5332d7 in argstr /home/jfe/dash/src/expand.c:343:4 > #10 0x5322f7 in expandarg /home/jfe/dash/src/expand.c:196:2 > #11 0x528118 in fill_arglist /home/jfe/dash/src/eval.c:659:3 > #12 0x5213b6 in evalcommand /home/jfe/dash/src/eval.c:769:13 > #13 0x520010 in evaltree /home/jfe/dash/src/eval.c:288:12 > #14 0x554423 in cmdloop /home/jfe/dash/src/main.c:234:8 > #15 0x553bcc in main /home/jfe/dash/src/main.c:176:3 > #16 0x7f201c2b2a86 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x21a86) > #17 0x41dfb9 in _start (/home/jfe/dash/src/dash+0x41dfb9) > > AddressSanitizer can not provide additional info. > SUMMARY: AddressSanitizer: SEGV /home/jfe/dash/src/redir.c:305:29 in openhere > ==39623==ABORTING > > This bug can be reproduced by running "dash < min" where min is þhe file > attached. I was able to reproduce this bug with the current git version > and the current debian version. > > cheers > project-repo > > <<A > `<<A(` Thanks for the report! This is caused by the recent change to save/restore here-docment list around command substitutions. In doing so we must finish existing here-documents prior to restoring the old here-document list. This is done for new-style command substitutions but not for old-style. This patch fixes it by doing it for both. Reported-by: project-repo <bugs@feusi.co> Fixes: 51e2d88d6e51 ("parser: Save/restore here-documents in...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Reset handler when entering a subshellHerbert Xu2019-03-28
| | | | | | | | | | As it is a subshell can execute code that is only meant for the parent shell when it executes a longjmp that is caught by something like evalcommand. This patch fixes it by resetting the handler when entering a subshell. Reported-by: Martijn Dekker <martijn@inlv.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Fix double-decrement in argstrHerbert Xu2019-03-28
| | | | | | | | | Due to a double decrement in argstr we may miss field separators at the end of a word in certain situations. Reported-by: Martijn Dekker <martijn@inlv.org> Fixes: 3cd538634f71 ("expand: Do not reprocess data when...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* options: Do not set commandname in procargsHerbert Xu2019-03-28
| | | | | | | | We set commandname in procargs when we don't have to. This results in a duplicated output of arg0 when an error occurs. Reported-by: Olivier Duclos <odc@fastmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* redir: Handle nested exec within REALLY_CLOSED redirectionHerbert Xu2019-02-25
| | | | | | | | | | | | | | | | The value of REALLY_CLOSED is used to avoid an unnecessary close(2) call when restoring redirections. However, as it stands it can remove a close(2) call that's actually needed. This happens when an enclosed exec(1) command leaves an open file descriptor behind. This patch fixes this by replacing REALLY_CLOSED with closed_redirs to track the current status of redirected file descriptors and leaving redirlist to only handle the previous state of redirected file descriptors. Reported-by: Martijn Dekker <martijn@inlv.org> Fixes: ce0f1900d869 ("[REDIR] Fix redirect restore on saved file...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* output: Fix clang warnings about GNU old-style field designatorAntonio Ospite2019-02-25
| | | | | | | | | | | | | | | | | | | | | | Building with clang results in some warnings about the use of GNU old-style field designators: ----------------------------------------------------------------------- output.c:86:2: warning: use of GNU old-style field designator extension [-Wgnu-designator] nextc: 0, end: 0, buf: 0, bufsize: OUTBUFSIZ, fd: 1, flags: 0 ^~~~~~ .nextc = ... ----------------------------------------------------------------------- Fix the issue bu using C99 initializers instead. This should be safe and should not introduce any compatibility problems as it is done already in other parts of the codebase, like src/expand.c:ccmatch() and src/parser.c::readtoken1(). Signed-off-by: Antonio Ospite <ao2@ao2.it> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: Fix clang warnings about "string plus integer"Antonio Ospite2019-02-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Building with clang results in some warnings about integer values being added to strings: ----------------------------------------------------------------------- eval.c:1138:13: warning: adding 'int' to a string does not append to the string [-Wstring-plus-int] p = " %s" + (1 - sep); ~~~~~~^~~~~~~~~~~ eval.c:1138:13: note: use array indexing to silence this warning p = " %s" + (1 - sep); ^ & [ ] 1 warning generated. ... jobs.c:1424:16: warning: adding 'int' to a string does not append to the string [-Wstring-plus-int] str = "\"}" + !(quoted & 1); ~~~~~~^~~~~~~~~~~~~~~ jobs.c:1424:16: note: use array indexing to silence this warning str = "\"}" + !(quoted & 1); ^ & [ ] 1 warning generated. ----------------------------------------------------------------------- While the code itself is fine and the warnings are indeed harmless, fixing them also makes the semantic more explicit: what it is actually being increased is the address which points to the start of the string in order to skip the initial character when some conditions are met. Signed-off-by: Antonio Ospite <ao2@ao2.it> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Only restore exit status on exit/returnHerbert Xu2019-02-25
| | | | | | | | | | We unconditionally restore the saved status in exitreset, which is incorrect as we only want to do it for exitcmd and returncmd. This patch fixes the problem by introducing EXEND. Reported-by: Martijn Dekker <martijn@inlv.org> Fixes: da30b4b78769 ("[BUILTIN] Exit without arguments in a trap...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: avoid leaking memory associated with redirectionsHerbert Xu2019-02-25
| | | | | | | | | | | | | | | | | | | | | The following constructs result in ever-increasing memory usage: while true; do { true; } </dev/null; done while true; do ( true; ) </dev/null; done For comparison, bash displays static memory usage in both cases. This issue was reported for BusyBox ash which is derived from dash: https://bugs.busybox.net/show_bug.cgi?id=7748 Signed-off-by: Ron Yorston <rmy@frippery.org> I have simplified evaltree so that it simply sets the stack mark unconditionally. This allows us to remove the stack marks in the functions called by evaltree. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* system: Disable glibc warning on sigsetmaskHerbert Xu2018-12-14
| | | | | | | | | | | | As sigsetmask is set as deprecated in glibc this patch adds the pragmas to disable the warning in gcc around our one and only use of sigsetmask. It also disables it completely for non-gcc compilers and older gcc compilers as they may generate a warning too. Reported-by: Antonio Ospite <ao2@ao2.it> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Use sh_warnx instead of warnxHerbert Xu2018-12-14
| | | | | | | | | | This patch fixes a typo in evalbltin where warnx was used instead of sh_warnx. Reported-by: Antonio Ospite <ao2@ao2.it> Fixes: 8e43729547b5 ("eval: Report I/O error on stdout") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Do not push token back before parseheredocHerbert Xu2018-12-14
| | | | | | | | | | | | | | | | | When we read the first token in list() we use peektoken instead of readtoken as the following code needs to use the same token again. However, this is wrong when we're in a here-document as it will clobber the saved token without resetting the tokpushback flag. This patch fixes it by doing the tokpushback after parseheredoc and setting lasttoken again if parseheredoc was called. Reported-by: Ron Yorston <rmy@frippery.org> Fixes: 7c245aa8ed33 ("[PARSER] Simplify EOF/newline handling in...") Fixes: ee5cbe9fd6bc ("[SHELL] Optimize dash -c "command" to avoid a fork") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Tested-by: Simon Ser <contact@emersion.fr>
* expand: Eat closing brace for length parameter expansionHerbert Xu2018-12-14
| | | | | | | | | | | | | When we are doing VSLENGTH expansion, the closing brace is currently not removed in evalvar. This causes the caller argstr to terminate prematurely as it would interpret the closing brace as one that belongs to a parameter expansion at the outer level. This patch fixes it. Reported-by: Martijn Dekker <martijn@inlv.org> Fixes: 3cd538634f71 ("expand: Do not reprocess data when...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Use the correct expansion mode for fd redirectionHerbert Xu2018-12-14
| | | | | | | | | | | | | | | It has been reported that echo test >&$EMPTY_VARIABLE causes dash to segfault. This is a symptom of the bigger problem that dash tries to perform pathname expansion as well as field splitting on the word after >& and <&. This is wrong and this patch fixes it to use the same expansions as done on a normal redirection. Reported-by: Andrej Shadura <andrew.shadura@collabora.co.uk> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Silence compiler warning about missing parenthesesAntonio Ospite2018-12-14
| | | | | | | | | | | | | | | | | | | | Gcc gives a warning about some missing parentheses: ----------------------------------------------------------------------- eval.c: In function ‘evaltree’: eval.c:282:15: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses] if (!status == isor || evalskip) ^~ eval.c:282:7: note: add parentheses around left hand side expression to silence this warning if (!status == isor || evalskip) ^~~~~~~ ( ) ----------------------------------------------------------------------- Add the parentheses to silence the warning. Signed-off-by: Antonio Ospite <ao2@ao2.it> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: Enable automake silent rulesAntonio Ospite2018-12-14
| | | | | | | | | | | | | Enable automake silent rules to make it easier to spot compilation problems. Silent rules will be enabled by default, but only if they are available, in order to keep compatibility with older autotools versions. Prepend the silent strings also to custom rules. Signed-off-by: Antonio Ospite <ao2@ao2.it> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: make traps work when "set -e" is enabledAntonio Ospite2018-12-14
| | | | | | | | | | | | | | | | | | | | | | | | | | When "set -e" is enabled traps are not always executed, in particular the EXIT trap is not executed when the shell exits on an unhandled error. Consider the following test script: #!/bin/dash set -e trap 'ret=$?; echo "EXIT: $ret"' EXIT trap 'exit 2' HUP INT QUIT PIPE TERM read variable By pressing Ctrl-C one would expect the EXIT trap to be called, as it is the case with other shells (bash, zsh), but dash does not do it. By calling dotrap() before jumping to the exit path when checkexit is not zero, dash behaves like other shells. Signed-off-by: Antonio Ospite <ao2@ao2.it> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Fix multiple issues with EXP_DISCARD in evalvarHerbert Xu2018-11-19
| | | | | | | | | | | | | | | | | | | | | | | | | The commit 3cd538634f71538370f5af239f342aec48b7470b broke parameter expansion in multiple ways because the EXP_DISCARD flag wasn't set or tested for various cases: $ src/dash -c 'var=; echo ${var:+nonempty}' nonempty $ src/dash -u -c 'unset foo bar; echo ${foo+${bar}}' dash: 1: bar: parameter not set $ src/dash -c 'foo=bar; echo ${foo=BUG}; echo $foo' barBUG bar $ This patch fixes them by introducing a new discard variable that tracks whether the extra word should be discarded or not when it is parsed. Reported-by: Martijn Dekker <martijn@inlv.org> Fixes: 3cd538634f71 ("expand: Do not reprocess data when...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Reported-by: Martijn Dekker <martijn@inlv.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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