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| * ash: eval: Reap zombies after built-in commands and functionsDenys Vlasenko2020-02-181-16/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | Merge branch 'busybox' into mergeRon Yorston2020-02-189-134/+234
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| * ash: exec: Never rehash regular built-insDenys Vlasenko2020-02-171-3/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: exec: Stricter pathopt parsingDenys Vlasenko2020-02-171-64/+104
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: exec: Do not allocate stack string in padvanceDenys Vlasenko2020-02-171-36/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: memalloc: Add growstackto helperDenys Vlasenko2020-02-171-17/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: parser: Save/restore here-documents in command substitutionDenys Vlasenko2020-02-171-9/+16
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: mkinit: Split reset into exitreset and resetDenys Vlasenko2020-02-171-7/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: expand: Fix trailing newlines processing in backquote expandingDenys Vlasenko2020-02-175-1/+25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: parser: Only accept single-digit parameter expansion outside of bracesDenys Vlasenko2020-02-175-1/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | 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>
* | Merge branch 'busybox' into mergeRon Yorston2020-02-173-36/+67
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| * ash: shell: Fix clang warnings about "string plus integer"Denys Vlasenko2020-02-161-1/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: eval: Use the correct expansion mode for fd redirectionDenys Vlasenko2020-02-161-2/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: expand: Fix skipping of command substitution when trimming in evalvarDenys Vlasenko2020-02-161-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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>
| * ash: main: Print \n upon EOF (CTRL-D) when run interactivelyDenys Vlasenko2020-02-161-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upstream comment: Date: Fri, 7 Sep 2018 10:34:14 +0200 main: Print \n upon EOF (CTRL-D) when run interactively 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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: expand: Use HOME in tilde expansion when it is emptyDenys Vlasenko2020-02-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upstream commit: Date: Sun, 27 May 2018 17:31:57 +0800 expand: Use HOME in tilde expansion when it is empty 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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: builtin: Mark more regular built-insDenys Vlasenko2020-02-161-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upstream commit: Date: Sat, 19 May 2018 02:39:49 +0800 builtin: Mark more regular built-ins 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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: jobs: Replace some uses of fmtstr with stpcpy/stpncpyDenys Vlasenko2020-02-161-8/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upstream commit: Date: Sat, 19 May 2018 02:39:45 +0800 jobs: Replace some uses of fmtstr with stpcpy/stpncpy 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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: output: Fix fmtstr return valueDenys Vlasenko2020-02-161-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Upstream commit: Date: Sat, 19 May 2018 02:39:44 +0800 output: Fix fmtstr return value 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> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: main: Only set savestatus in exitcmdDenys Vlasenko2020-02-161-7/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upstream commit: Date: Sat, 19 May 2018 02:39:38 +0800 main: Only set savestatus in exitcmd Currently exitcmd sets exitstatus and then savestatus if the latter was previously set. In fact, as exitcmd always raises an exception and will either end up in the setjmp call in main() or exitshell(), where exitstatus is always replaced by savestatus if set, we only need to set savestatus. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: [BUILTIN] Exit without arguments in a trap should use status outside trapsDenys Vlasenko2020-02-163-13/+38
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Upstream commit: Date: Mon Oct 6 10:39:47 2014 +0800 [BUILTIN] Exit without arguments in a trap should use status outside traps POSIX now requires that exit without arguments in a trap should return the last command status prior to executing traps. This patch implements this behaviour. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: parser: Fix incorrect eating of backslash newlinesDenys Vlasenko2020-02-161-2/+8
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Keeping up with upstream (in our case, 'before patch' code is not buggy). Upstream commit: Date: Fri, 11 May 2018 23:41:25 +0800 parser: Fix incorrect eating of backslash newlines With the introduction of synstack->syntax, a number of references to the syntax variable was missed during the conversion. This causes backslash newlines to be incorrectly removed in single quote context. This patch also combines these calls into a new helper function pgetc_top. Fixes: ab1cecb40478 ("parser: Add syntax stack for recursive...") Reported-by: Leah Neukirchen <leah@vuxu.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: use pgetc_eatbnl() in more places, take 2Denys Vlasenko2020-02-161-6/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Adding previously skipped "readtoken1(pgetc_eatbnl(), DQSYNTAX..." changes from upstream commit: Date: Thu Mar 8 08:37:11 2018 +0100 Author: Harald van Dijk <harald@gigawatt.nl> parser: use pgetc_eatbnl() in more places dash has a pgetc_eatbnl function in parser.c which skips any backslash-newline combinations. It's not used everywhere it could be. There is also some duplicated backslash-newline handling elsewhere in parser.c. Replace most of the calls to pgetc() with calls to pgetc_eatbnl() and remove the duplicated backslash-newline handling. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
* | Merge branch 'busybox' into mergeRon Yorston2020-02-152-21/+56
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| * ash,hush: allow builtins to be tab-completed, closes 7532Ron Yorston2020-01-292-1/+35
| | | | | | | | | | | | | | | | | | | | | | | | | | | | function old new delta complete_cmd_dir_file 678 830 +152 get_builtin_name - 35 +35 optschanged 125 132 +7 hush_main 1069 1076 +7 save_command_ps_at_cur_history 76 78 +2 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 4/0 up/down: 203/0) Total: 203 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: improve expandstr()Ron Yorston2020-01-291-20/+21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The dash maintainer recently posted a fix for issues with expanding PS1. These had already been fixed differently in BusyBox ash. Borrow a couple of improvements: - Use a single call to setjmp() to trap errors in both readtoken1() and expandarg(). - In case of error set the prompt to the literal value of PS1 rather than the half-digested nonsense in stackblock() which might include ugly control characters. function old new delta expandstr 353 300 -53 Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
* | ash: code shrinkRon Yorston2020-02-141-4/+12
| | | | | | | | | | | | Commit 575581082 (ash: move code from setup_environment()) replaced calls to xsetenv_if_unset() with explicit tests. I don't know why because using xsetenv_if_unset() saves 48 bytes.
* | ash: code shrinkRon Yorston2020-02-111-3/+15
| | | | | | | | | | | | | | Since we don't support execution of signal traps or the 'trap hack' there's no need for the may_have_traps variable or trap_ptr. Saves 64 bytes.
* | ash: fixes to trapRon Yorston2020-02-101-3/+4
| | | | | | | | | | | | | | If a trap is set for SIGINT don't call raise(SIGINT) in preadfd(), otherwise the shell exits because the signal isn't being caught. In forkshell_init() change the initialisation of trap and trap_ptr.
* | ash: don't compile dotrap()Ron Yorston2020-02-081-0/+6
| | | | | | | | | | | | | | | | Since signal handling isn't functional for WIN32 there's no need to compile dotrap(). Some elements of the globals_misc structure can also be excluded. Saves 144 bytes.
* | ash: fixes to handling of ctrl-C in read builtinRon Yorston2020-02-082-2/+22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Consider this script: while read -r; do echo $REPLY; done echo hello There are currently two problems with this when the read is interrupted by ctrl-C: - The error return code is 0 when it should be 130; - The echo command is executed. Fix these issues by propagating the control event to the process that would have caught it if the read builtin hadn't grabbed keyboard input.
* | ash: catch EOF in read builtinRon Yorston2020-02-081-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The read builtin didn't detect EOF so it wasn't possible to cleanly terminate a loop like: while read -r; do echo $REPLY; done Consider how Linux handles EOF (represented as ^D, though this isn't echoed): $ awk '{print}' | xxd abc^D123 ^D 00000000: 6162 6331 3233 0a abc123. Contrast with busybox-w32 on Windows (where the ^Z is echoed): $ awk '{print}' | xxd abc^Z123 ^Z 00000000: 6162 631a 3132 330a abc.123. In both cases EOF is only detected at the start of a line. On Linux EOF within a line is dropped; on Windows it's output as a literal ctrl-Z. Implement similar behaviour for the read builtin.
* | ash: process backspace in read builtinRon Yorston2020-02-071-0/+10
| | | | | | | | | | | | | | | | | | | | | | Previously the 'read' builtin had no special treatment for backspace characters entered in interactive mode: they were simply added to the string being read. Change this so that backspace deletes the previous character from the buffer and updates the display to match. It still doesn't handle tabs in the input or lines that are larger than the console width.
* | ash: remove obsolete commentRon Yorston2020-02-041-4/+1
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* | ash: tidy up history_copy()Ron Yorston2020-01-211-6/+6
| | | | | | | | No change in functionality or executable size.
* | ash: fix out of bounds read in tblentry_copy()Ron Yorston2020-01-191-1/+1
| | | | | | | | | | | | Commit 2ffcb860e (ash: minor fixes to forkshell handling) ensured that tblentry structures were properly aligned but also resulted in reads beyond the end of the allocated structure.
* | ash: reduce size of forkshell relocation mapRon Yorston2020-01-181-70/+77
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The functions to calculate the size of the forkshell data block returned the total size of funcblock and funcstring. The relocation map only needs to cover the size of the forkshell structure plus funcblock, not funcstring. Revise the *_size() functions to distinguish between funcblock and funcstring. Avoid complicating the calculation of node sizes (calcsize() and related functions). This slightly overestimates the size of funcblock by including strings stored in node structures. This change increases the binary by 96 bytes but can save several thousand bytes at runtime.
* | ash: simplify MARK_PTR macroRon Yorston2020-01-181-9/+16
| | | | | | | | | | | | | | The MARK_PTR macro was unnecessarily complex. Since the relocation map is a fixed offset from the start of the forkshell structure we can obtain a pointer to the flag corresponding to a given destination pointer knowing just the pointer and the offset. Saves 324 bytes.
* | ash: reorder SAVE_PTR macrosRon Yorston2020-01-181-10/+8
| | | | | | | | | | | | Group together the code to mark pointers in the relocation map and that to store annotations. This allows some optimisations when forkshell debugging is enabled, saving 32 bytes.
* | ash: relocatesize may differ from forkshell block sizeRon Yorston2020-01-181-9/+12
| | | | | | | | | | | | | | Currently the size of the relocate map is equal to the size of the forkshell struct plus funcblock and funcstring. This may not always be the case so record the size of the map separately. This doesn't affect the size of the binary.
* | ash: rework how pointers are adjusted during forkshellRon Yorston2020-01-161-229/+185
| | | | | | | | | | | | | | | | | | | | The original code kept an array of pointers to pointers that needed to be adjusted after forkshell (nodeptr). Switch to using a map to indicate which locations in the data block need to be adjusted. This requires a larger data block. However the *_size() functions which calculate the data block size need less information about the data structures. Saves about 100 bytes in the binary.
* | ash: minor fixes to forkshell handlingRon Yorston2020-01-141-4/+2
| | | | | | | | | | | | | | | | Ensure that tblentry structures are properly aligned. The cmdname array has a size of one but the code doesn't allow for this in case upstream ever switches to using an empty array. Remove a couple of unnecessary increments.
* | Merge branch 'busybox' into mergeRon Yorston2020-01-088-75/+184
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| * hush: fix preprocessor directives indentationDenys Vlasenko2019-11-281-32/+32
| | | | | | | | Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * hush: restore redirected stdinDenys Vlasenko2019-11-015-7/+42
| | | | | | | | | | | | | | | | | | | | | | | | | | function old new delta restore_redirects 52 95 +43 save_fd_on_redirect 243 253 +10 hfopen 90 99 +9 fgetc_interactive 259 261 +2 builtin_type 117 115 -2 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 4/1 up/down: 64/-2) Total: 62 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * clang/llvm 9 fix - do not eliminate a store to a fake "const"Denys Vlasenko2019-10-251-3/+3
| | | | | | | | | | | | | | This is *much* better (9 kbytes better) than dropping "*const" optimization trick. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * shell: better comments in BASE#nn codeDenys Vlasenko2019-10-221-10/+14
| | | | | | | | | | | | | | function old new delta evaluate_string 932 930 -2 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * shell/ulimit: code shrinkDenys Vlasenko2019-10-211-18/+59
| | | | | | | | | | | | | | | | text data bss dec hex filename 1001949 551 5612 1008112 f61f0 busybox_old 1001906 551 5612 1008069 f61c5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: fix BASE###nn bashism for bases 36..64Denys Vlasenko2019-09-221-3/+21
| | | | | | | | | | | | | | function old new delta evaluate_string 876 932 +56 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| * ash: fix BASE###nn bashism to accept letter 'digits' for bases > 9Denys Vlasenko2019-09-221-2/+9
| | | | | | | | | | | | | | function old new delta evaluate_string 873 876 +3 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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