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* 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>
* shell: delete AC_PROG_YACCFangrui Song2020-01-20
| | | | 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>
* shell: Update configure.ac with suggestions from autoupdateAntonio Ospite2018-12-14
| | | | | | | | | | | | | | Apply the changes suggested by running autoupdate on the source repository: 1. Properly quote AC_INIT arguments. 2. Use AC_USE_SYSTEM_EXTENSIONS instead of AC_GNU_SOURCE. The former is a superset of the latter, and enables more options, see https://www.gnu.org/software/autoconf/manual/autoconf-2.60/html_node/Posix-Variants.html 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>
* main: Print \n upon EOF (CTRL-D) when run interactivelyGerrit Pape2018-11-19
| | | | | | | | | | | | | | | | | | | | | | Exiting dash via a ^D instead of with "exit" causes dash to forget to print a newline. sh-3.1$ sh sh-3.1$ ^D sh-3.1$ dash $ sh-3.1$ It is more neat and tidy to send a newline similarly to what bash does, so it doesn't make the next prompt of the parent shell look ugly. Suggested by jidanni. Signed-off-by: Gerrit Pape <pape@smarden.org> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> [reworded the patch description] Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk> Bug-Debian: http://bugs.debian.org/476422 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Report I/O error on stdoutGerrit Pape2018-11-19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | ENOSPC as a result of an echo builting failing gives no diagnostic. Just as other shells, dash sets $? to 1, but aside from terminating the script, this does not inform the user what the problem is: zsh: % echo foo > /dev/full echo: write error: no space left on device bash: $ echo foo > /dev/full bash: echo: write error: No space left on device dash: $ echo foo > /dev/full [nothing] Print an error to stderr like the other shells. Suggested by Roger Leigh. Signed-off-by: Gerrit Pape <pape@smarden.org> [reworded the patch description with information from the bug] Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk> Bug-Debian: http://bugs.debian.org/690473 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: Default to mktemp, not tempfileAndrej Shadura2018-11-19
| | | | | | | | Don't use tempfile, as it currently runs tempnam(), which is insecure and fails under pseudo(1). Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: update .gitignoreMartijn Dekker2018-11-19
| | | | | | Ignore .deps and .dirstamp in all directories. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* man: Problems in dash.1, sh.1, sh.distrib.1esr@thyrsus.com2018-08-29
| | | | | | | | | | | | | | | | | This is automatically generated email about markup problems in a man page for which you appear to be responsible. If you are not the right person or list, please tell me so I can correct my database. See http://catb.org/~esr/doclifter/bugs.html for details on how and why these patches were generated. Feel free to email me with any questions. Note: These patches do not change the modification date of any manual page. You may wish to do that by hand. I apologize if this message seems spammy or impersonal. The volume of markup bugs I am tracking is over five hundred - there is no real alternative to generating bugmail from a database and template. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* expand: Ensure result is escaped in cvtnumHerbert Xu2018-08-29
| | | | | | | | | | | 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>
* memalloc: Avoid looping in growstacktoHerbert Xu2018-08-29
| | | | | | | | 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>
* eval: Always set localvar_stopHerbert Xu2018-08-29
| | | | | | | | | | 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>
* expand: Do not reprocess data when expanding wordsHerbert Xu2018-08-29
| | | | | | | | | | | | | | | | | | | | | | | | 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>
* expand: Fix skipping of command substitution when trimming in evalvarHerbert Xu2018-08-29
| | | | | | | | | 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>
* expand: Merge syntax/quotes in memtodest with flagsHerbert Xu2018-08-29
| | | | | | | | | | | | | | | | 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>
* expand: Use HOME in tilde expansion when it is emptyHerbert Xu2018-08-29
| | | | | | | | Currently if HOME is set to empty tilde expansion will fail, i.e., it will remain as a literal tilde. This patch changes it to return the empty string as required by POSIX. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* shell: Don't include config.h for native helpersPeter Korsgaard2018-08-29
| | | | | | | | | | | | | | | | | | | | | | | config.h contains settings for the cross compiler (most importantly 32/64bit versions of functions), so don't include it when calling the native compiler to build the helpers. Otherwise we get build errors like: /usr/bin/gcc -include ../config.h -DBSD=1 -DSHELL -DIFS_BROKEN -g -O2 -Wall -o mkinit mkinit.c In file included from /usr/include/sys/stat.h:107, from /usr/include/fcntl.h:38, from mkinit.c:50: /usr/include/bits/stat.h:117: error: redefinition of ‘struct stat’ In file included from /usr/include/fcntl.h:38, from mkinit.c:50: /usr/include/sys/stat.h:504: error: redefinition of ‘stat’ /usr/include/sys/stat.h:455: note: previous definition of ‘stat’ was here Signed-off-by: Peter Korsgaard <peter@korsgaard.com> [baruch: apply to Makefile.am; update Peter's email address] Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* builtin: Use test_access from NetBSD when faccessat is unavailableHerbert Xu2018-05-28
| | | | | | | | This patch adds the test_access code from NetBSD when faccess is unavailable. The code has been modified so that root can always read/write any file. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Add vfork supportHerbert Xu2018-05-28
| | | | | | This patch adds basic vfork support for the case of a simple command. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* eval: Replace with listsetvar with mklocal/setvareqHerbert Xu2018-05-28
| | | | | | | | | | | | 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>
* eval: Fail immediately with redirections errors for simple commandHerbert Xu2018-05-28
| | | | | | | | 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>
* eval: Add assignment built-in support againHerbert Xu2018-05-28
| | | | | | | | | | | 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>
* exec: Never rehash regular built-insHerbert Xu2018-05-28
| | | | | | | 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>
* exec: Stricter pathopt parsingHerbert Xu2018-05-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* builtin: Mark more regular built-insHerbert Xu2018-05-28
| | | | | | | | | | | | This patch marks the following built-ins as regular, meaning that they cannot be overriden using PATH search: hash pwd type ulimit Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* exec: Do not allocate stack string in padvanceHerbert Xu2018-05-28
| | | | | | | | | | | 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>
* memalloc: Add growstackto helperHerbert Xu2018-05-28
| | | | | | | 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>
* jobs: Replace some uses of fmtstr with stpcpy/stpncpyHerbert Xu2018-05-28
| | | | | | | | | Some uses of fmtstr, particularly the ones without a format string, can be replaced with stpcpy or stpncpy. This patch does that so we don't have to introduce unnecessary format strings in order to silence compiler warnings. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* output: Fix fmtstr return valueHerbert Xu2018-05-28
| | | | | | | The function fmtstr is meant to return the actual length of output produced, rather than the untruncated length. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* var: Set IFS to fixed value at start timeHerbert Xu2018-05-28
| | | | | | | | | This patch forces the IFS variable to always be set to its default value, regardless of the environment. It also removes the long unused IFS_BROKEN code. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* parser: Save/restore here-documents in command substitutionHerbert Xu2018-05-28
| | | | | | | | | | | | 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>
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-23 01:48:56 +0000