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2020-10-06avoid using strok - eliminates use of hidden global variableDenys Vlasenko
function old new delta udhcp_str2optset 616 650 +34 setpriv_main 950 975 +25 switch_root_main 688 706 +18 parse 958 970 +12 getopt_main 622 628 +6 parse_resolvconf 302 306 +4 mpstat_main 1139 1142 +3 static.p 4 - -4 cdcmd 717 702 -15 strtok 148 - -148 ------------------------------------------------------------------------------ (add/remove: 0/3 grow/shrink: 7/1 up/down: 102/-167) Total: -65 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-10-01shell: remove FAST_FUNC from a static functionDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-09-29shell: add testsuite for "wait $pid" waiting for other tasksDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-09-29ash: jobs: Fix waitcmd busy loopDenys Vlasenko
Upstream commit: Date: Tue, 2 Jun 2020 23:46:48 +1000 jobs: Fix waitcmd busy loop 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> This change also incorporates other changes to bring us closer to upstream. function old new delta dowait 553 636 +83 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-09-29ash: jobs: Fix infinite loop in waitprocDenys Vlasenko
Upstream commit: Date: Fri, 10 Apr 2020 21:03:09 +1000 jobs: Fix infinite loop in waitproc 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> function old new delta dowait 553 631 +78 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-09-29ash: remove a tentative TODO, it's a wrong ideaDenys Vlasenko
Upstream tried it, and then reverted by: From: Herbert Xu <herbert@gondor.apana.org.au> Date: Tue, 26 May 2020 23:19:05 +1000 parser: Fix double-backslash nl in old-style command sub Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-07-31shell: Fix "read -d ''" behaviorChristian Eggers
With bash's read builtin it is possible to read from a file (e.g. device-tree) until the first '\0' character: IFS= read -r -d '' VARIABLE < file In busybox ash the -d extension is also implemented, but checking the read character for '\0' has to be performed after comparing with the delimiter. Signed-off-by: Christian Eggers <ceggers@arri.de> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-06-24nologin: make it possible to build it as single appletDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-06-24suppress a few compile warningsDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-04-30ash,hush: drop pointer check before calls to show_historyRon Yorston
show_history() checks that its argument in non-null so there's no need to repeat the test at call sites. function old new delta historycmd 25 17 -8 builtin_history 29 21 -8 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-16) Total: -16 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-04-30ash: fix build failure when command built-in is disabledRon Yorston
Since commit 7eb8eecbb (ash: eval: Add assignment built-in support again) building BusyBox with the 'command' built-in disabled fails. parse_command_args() only needs to be called when the 'command' built-in is run. Which it won't be if it's disabled. v2: Avoiding infinite loops is good, too. Thanks, Harald van Dijk. Reported-by: Deweloper <deweloper@wp.pl> Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-26shells: fix exitcode_trapN tests to avoid racesDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-24ash: expand: Fix multiple issues with EXP_DISCARD in evalvarDenys Vlasenko
Upstream commit: Date: Wed, 12 Sep 2018 14:27:16 +0800 expand: Fix multiple issues with EXP_DISCARD in evalvar 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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-24ash: expand: Do not reprocess data when expanding wordsDenys Vlasenko
Upstream patch: Date: Wed, 30 May 2018 02:06:03 +0800 expand: Do not reprocess data when expanding words Currently various paths will reprocess data when performing word expansion. For example, expari will skip backwards looking for the start of the arithmetic expansion, while evalvar will skip unexpanded words manually. This is cumbersome and error-prone. This patch fixes this by making word expansions proceed in a linear fashion. This means changing argstr and the various expansion functions such as expari and subevalvar to return the next character to be expanded. This is inspired by similar code from FreeBSD. However, we take things one step further and completely remove the manual word skipping in evalvar. This is accomplished by introducing a new EXP_DISCARD flag that tells argstr to only parse and not produce any actual expansions. Incidentally, argstr will now always NUL-terminate the expansion unless the EXP_WORD flag is set. This is because all but one caller of argstr wants the result to be NUL-termianted. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Also includes two one-line follow-up fixes: expand: Eat closing brace for length parameter if (subtype == VSLENGTH) { + p++; if (flag & EXP_DISCARD) expand: Fix double-decrement in argstr - newloc = expdest - (char *)stackblock() - end; + newloc = q - (char *)stackblock() - end; and changes in code for bash substring extensions. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-24ash: move TRACE statement in evalcommand()Ron Yorston
Following recent work on evalcommand() a TRACE statement to report the status of a forked command was left in the wrong place. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-24ash: rename some function parameters to match dashDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-24ash: rename stack_nputstr() back to stnputs() to match dashDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-22ash: Expand here-documents in the current shell environmentDenys Vlasenko
Upstream commit: Date: Sun, 11 Nov 2007 15:27:00 +0800 Expand here-documents in the current shell environment Previously we always expanded here-documents in a subshell. This is contrary to the POSIX specification and how other shells behave. What's more this slows down many expansions due to the extra fork (however, it must be said that it is possible for it speed up certain expansions by running it simultaneously with the command on two CPUs). This patch move the expansion into the current shell environment. Test case: unset a cat <<- EOF > /dev/null ${a=NOT} EOF echo ${a}BAD Old result: BAD New result: NOTBAD Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-22ash: parser: Do not push token back before parseheredocDenys Vlasenko
Upstream commit: Date: Mon, 19 Nov 2018 18:43:58 +0800 parser: Do not push token back before parseheredoc When we read the first token in list() we use peektoken instead of readtoken as the following code needs to use the same token again. However, this is wrong when we're in a here-document as it will clobber the saved token without resetting the tokpushback flag. This patch fixes it by doing the tokpushback after parseheredoc and setting lasttoken again if parseheredoc was called. Reported-by: Ron Yorston <rmy@frippery.org> Fixes: 7c245aa8ed33 ("[PARSER] Simplify EOF/newline handling in...") Fixes: ee5cbe9fd6bc ("[SHELL] Optimize dash -c "command" to avoid a fork") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Tested-by: Simon Ser <contact@emersion.fr> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-22ash: parser: Fix old-style command substitution here-document crashDenys Vlasenko
Upstream commit: Date: Fri, 29 Mar 2019 13:49:59 +0800 parser: Fix old-style command substitution here-document crash ... This is caused by the recent change to save/restore here-docment list around command substitutions. In doing so we must finish existing here-documents prior to restoring the old here-document list. This is done for new-style command substitutions but not for old-style. This patch fixes it by doing it for both. Fixes: 51e2d88d6e51 ("parser: Save/restore here-documents in...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-21hush: fix negative_arith.tests: glob-protect dash in "$((arith))"Denys Vlasenko
function old new delta expand_vars_to_list 1026 1082 +56 parse_dollar 810 811 +1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 57/0) Total: 57 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-21ash: expand: Ensure result is escaped in cvtnumDenys Vlasenko
Upstream commit: Date: Fri, 1 Jun 2018 18:25:29 +0800 expand: Ensure result is escaped in cvtnum The minus sign generated from arithmetic expansion is currently unquoted which causes anomalies when the result is used in where the quoting matters. This patch fixes it by explicitly calling memtodest on the result in cvtnum. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-21ash: memalloc: Avoid looping in growstacktoDenys Vlasenko
Upstream commit: Date: Thu, 31 May 2018 01:51:48 +0800 memalloc: Avoid looping in growstackto Currently growstackto will repeatedly call growstackblock until the requisite size is obtained. This is wasteful. This patch changes growstackblock to take a minimum size instead. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-21hush: make "exit" in trap use pre-trap exitcode - fix for nested trapDenys Vlasenko
function old new delta check_and_run_traps 276 278 +2 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-21hush: make "exit" in trap use pre-trap exitcodeDenys Vlasenko
function old new delta check_and_run_traps 259 276 +17 builtin_exit 42 53 +11 hush_main 1086 1096 +10 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 38/0) Total: 38 bytes Fixes exitcode_trap2.tests. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20ash: eval: Only restore exit status on exit/returnDenys Vlasenko
Upstream commit: Date: Fri, 14 Dec 2018 13:52:02 +0800 eval: Only restore exit status on exit/return 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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20ash: Return without arguments in a trap should use status outside trapsDenys Vlasenko
Fixes exitcode_trap4.tests. Upstream commit: Date: Mon, 6 Oct 2014 21:51:26 +0800 Return without arguments in a trap should use status outside traps POSIX now requires that return without arguments in a trap should return the last command status prior to executing traps. This patch implements this behaviour. Incidentally this also changes the behaviour of return without arguments in a loop conditional to use the last exit status in the body as opposed to the last command in the conditional when there is one. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20hush: implement "return NUM in trap sets $? after trap"Denys Vlasenko
function old new delta builtin_return 47 67 +20 check_and_run_traps 243 259 +16 run_pipe 1583 1597 +14 hush_main 1076 1086 +10 run_list 1054 1055 +1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 5/0 up/down: 61/0) Total: 61 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20ash: return exit status of nofork applets (again)Ron Yorston
Since commit d81af7216 (ash: eval: Reap zombies after built-in commands and functions) if the shell is compiled with SH_STANDALONE and SH_NOFORK enabled nofork applets potentially return the incorrect status. The status value returned by evalcommand() in this case is obtained from exitstatus in a call to waitforjob(NULL). This overwrites the status set for nonfork applets. If this commit seems familiar it's essentially a reversion of commit 5ccb0e92fa (ash: return exit status of nofork applets). What was correct in 2016 is wrong in 2020 and vice versa. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20ash: expand: Merge syntax/quotes in memtodest with flagsDenys Vlasenko
Upstream commit: Date: Mon, 28 May 2018 00:17:39 +0800 expand: Merge syntax/quotes in memtodest with flags The function arguments syntax and quotes are both derived from the expansion flags. As syntax is only used by memtodest we do not need to maintain it outside of the function at all. The only place that uses something other than BASESYNTAX or DQSYNTAX is exptilde. However in that case DQSYNTAX has exactly the same effect as SQSYNTAX. This patch merges these two arguments into a single flags. The macro QUOTES_KEEPNUL has been renamed to EXP_KEEPNUL in order to keep the namespace separate. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20ash: eval: Always set localvar_stopDenys Vlasenko
Upstream commit: Date: Thu, 31 May 2018 01:15:34 +0800 eval: Always set localvar_stop The variable localvar_stop is set iff vlocal is true. gcc doesn't get this so we get a spurious warning. This patch fixes this by always calling pushlocalvars with vlocal and making it only actually do the push if vlocal is non-zero. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20ash: eval: Replace with listsetvar with mklocal/setvareqDenys Vlasenko
Upstream commit: Date: Sat, 19 May 2018 02:39:55 +0800 eval: Replace with listsetvar with mklocal/setvareq This patch replaces listsetvar with mklocal/setvareq. As we now determine special built-in status prior to variable assignment, we no longer have to do a second pass listsetvar. Instead we will call setvareq directly instead of mklocal when necessary. In order to do this mklocal can now take a flag in order to mark a variable for export. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20ash: eval: Fail immediately with redirections errors for simple commandDenys Vlasenko
Upstream commit: Date: Sat, 19 May 2018 02:39:54 +0800 eval: Fail immediately with redirections errors for simple command Previously, dash would continue to perform variable expansions even if a redirection error occured. This patch changes it so that it fails immediately. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-20ash: eval: Add assignment built-in support againDenys Vlasenko
Upstream commit: Date: Sat, 19 May 2018 02:39:52 +0800 eval: Add assignment built-in support again This patch adds assignment built-in support that used to exist in dash prior to 0.3.8-15. This is because it will soon be part of POSIX, and the semantics are now much better defined. Recognition is done at execution time, so even "command -- export" or "var=export; command $var" should work. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-19ash,hush: testcase for "exit" without arguments in a trapDenys Vlasenko
hush fails this one Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-18ash,hush: add comment about masked SIGCHLD, handle SIG_IGNed SIGHUP as in bashDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-18ash: jobs: Only clear gotsigchld when waiting for everythingDenys Vlasenko
Upstream commit: Date: Sat, 19 May 2018 02:39:41 +0800 jobs: Only clear gotsigchld when waiting for everything The gotsigchld flag is always cleared in dowait but not all callers of dowait will wait for everything. In particular, when jp is set we only wait until the set job isn't running anymore. This patch fixes this by only clearing gotsigchld if jp is unset. It also changes the waitcmd to actually set jp which corresponds to the behaviour of bash/ksh93/mksh. The only other caller of dowait that doesn't wait for everything is the jobless reaper. This is in fact redundant now that we wait after every simple command. This patch removes it. Finally as every caller of dowait needs to wait until either the given job is not running, or until all terminated jobs have been processed, this patch moves the loop into dowait itself. Fixes: 03876c0743a5 ("eval: Reap zombies after built-in...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-18ash: jobs - Do not block when waiting on SIGCHLDDenys Vlasenko
Upstream comment: Date: Mon, 7 May 2018 00:40:34 +0800 jobs - Do not block when waiting on SIGCHLD Because of the nature of SIGCHLD, the process may have already been waited on and therefore we must be prepared for the case that wait may block. So ensure that it doesn't by using WNOHANG. Furthermore, multiple jobs may have exited when gotsigchld is set. Therefore we need to wait until there are no zombies left. Lastly, waitforjob needs to be called with interrupts off and the original patch broke that. Fixes: 03876c0743a5 ("eval: Reap zombies after built-in...") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> While at it, removed INT_ON/OFF in waitforjob() - it must be called from INT_OFF region anyway. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-18ash: eval: Reap zombies after built-in commands and functionsDenys Vlasenko
Upstream commit: Date: Mon, 26 Mar 2018 23:55:50 +0800 eval: Reap zombies after built-in commands and functions Currently dash does not reap dead children after built-in commands or functions. This means that if you construct a loop consisting of solely built-in commands and functions, then zombies can hang around indefinitely. This patch fixes this by reaping when necessary after each built-in command and function. Reported-by: Denys Vlasenko <vda.linux@googlemail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-17ash: exec: Never rehash regular built-insDenys Vlasenko
Upstream commit: Date: Sat, 19 May 2018 02:39:51 +0800 exec: Never rehash regular built-ins As regular (including special) built-ins can never be overridden, we should never remove them from the hash table. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-17ash: exec: Stricter pathopt parsingDenys Vlasenko
Upstream comment: Date: Sat, 19 May 2018 02:39:50 +0800 exec: Stricter pathopt parsing This patch changes the parsing of pathopt. First of all only %builtin and %func (with arbitrary suffixes) will be recognised. Any other pathopt will be treated as a normal directory. Furthermore, pathopt can now be specified before the directory, rather than after it. In fact, a future version may remove support for pathopt suffixes. Wherever the pathopt is placed, an optional % may be placed after it to terminate the pathopt. This is so that it is less likely that a genuine directory containing a % sign is parsed as a pathopt. Users of padvance outside of exec.c have also been modified: 1) cd(1) will always treat % characters as part of the path. 2) chkmail will continue to accept arbitrary pathopt. 3) find_dot_file will ignore the %builtin pathopt instead of trying to do a stat in the accompanying directory (which is usually the current directory). The patch also removes the clearcmdentry optimisation where we attempt to only partially flush the table where possible. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-17ash: exec: Do not allocate stack string in padvanceDenys Vlasenko
Upstream commit: Date: Sat, 19 May 2018 02:39:48 +0800 exec: Do not allocate stack string in padvance Many callers of padvance immediately free the allocated string so this patch moves the stalloc call to the caller. Instead of returning the allocated string, padvance now returns the length to allocate (this may be longer than the actual string length, even including the NUL). For the case where we would previously return NULL, we now return -1. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-17ash: memalloc: Add growstackto helperDenys Vlasenko
Upstream commit: Date: Sat, 19 May 2018 02:39:46 +0800 memalloc: Add growstackto helper This patch adds the growstackto helper which repeatedly calls growstackblock until the requested size is reached. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-17ash: parser: Save/restore here-documents in command substitutionDenys Vlasenko
Upstream comment: Date: Sat, 19 May 2018 02:39:42 +0800 parser: Save/restore here-documents in command substitution This patch changes the parsing of here-documents within command substitution, both old style and new style. In particular, the original here-document list is saved upon the beginning of parsing command substitution and restored when exiting. This means that here-documents outside of command substitution can no longer be filled by text within it and vice-versa. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-17ash: mkinit: Split reset into exitreset and resetDenys Vlasenko
Upstream commit: Date: Sat, 19 May 2018 02:39:40 +0800 mkinit: Split reset into exitreset and reset Previously reset was called after exitshell. This was changed so that it was called before exitshell because certain state needed to be reset in order for the EXIT trap to work. However, this caused issues because certain other states (such as local variables) should not be reset. This patch fixes this by creating a new function exitreset that is called prior to exitshell and moving reset back to its original location. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-17ash: expand: Fix trailing newlines processing in backquote expandingDenys Vlasenko
Upstream commit: Date: Mon, 29 Apr 2019 19:13:37 +0500 expand: Fix trailing newlines processing in backquote expanding 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 $(echo "") 2 END prints "1<newline>2" instead of expected "1<newline><newline>2". This patch fixes trailing newlines processing in backquote expanding. Signed-off-by: Nikolai Merinov <n.merinov@inango-systems.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-17ash: parser: Only accept single-digit parameter expansion outside of bracesDenys Vlasenko
Upstream commit: Date: Mon, 27 May 2019 13:39:37 +0800 parser: Only accept single-digit parameter expansion outside of braces This patch should fix the problem. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-16ash: shell: Fix clang warnings about "string plus integer"Denys Vlasenko
Upstream commit: Date: Sat, 15 Dec 2018 18:49:31 +0100 shell: Fix clang warnings about "string plus integer" Building with clang results in some warnings about integer values being added to strings. While the code itself is fine and the warnings are indeed harmless, fixing them also makes the semantic more explicit: what it is actually being increased is the address which points to the start of the string in order to skip the initial character when some conditions are met. Signed-off-by: Antonio Ospite <ao2@ao2.it> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-16ash: eval: Use the correct expansion mode for fd redirectionDenys Vlasenko
Upstream comment: Date: Mon, 19 Nov 2018 18:00:32 +0800 eval: Use the correct expansion mode for fd redirection It has been reported that echo test >&$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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2020-02-16ash: expand: Fix skipping of command substitution when trimming in evalvarDenys Vlasenko
Upstream commit: Date: Mon, 28 May 2018 17:09:48 +0800 expand: Fix skipping of command substitution when trimming in evalvar When we are trimming an unset variable in evalvar, any embedded command substitution that should have been skipped are not. This can cause them to be evaluated later should there be other command substitutions in the same input word. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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