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* [BUILTIN] Simplify echo commandHerbert Xu2014-10-27
| | | | Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Optimise handling of backslash octals in printfHerbert Xu2014-10-27
| | | | | | | This patch removes the duplicate octal handling for %b by reusing the existing code in conv_escape. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Use error instead of warnx for fatal errors in printfHerbert Xu2014-10-27
| | | | | | | | This patch replaces uses of warnx where we abort with error since the effect is the same. The exit status however changes from 1 to 2. Non-fatal errors where we continue are unchanged. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Remove getintmax in printfHerbert Xu2014-10-27
| | | | | | | This patch removes getintmax and moves its functionality into getuintmax in order to reduce code duplication. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Remove unnecessary restoration of format string in printfHerbert Xu2014-10-27
| | | | | | | | Currently we try to preserve the format string which is stored in argv after temporarily modifying it. This is unnecessary as it's only ever used once. This patch gets rid of it. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [OUTPUT] Add ifdefs around MEM_OUT handling in outmemHerbert Xu2014-10-27
| | | | | | | MEM_OUT is only used by forkless backtick processing which we do not currently support. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [OUTPUT] Add likely tag in outmemHerbert Xu2014-10-27
| | | | | | | The branch in outmem where the string fits in the buffer is the common case and is now marked as likely. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [INPUT] Replace open-coded flushall in preadbufferHerbert Xu2014-10-27
| | | | Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Handle embedded NULs correctly in printfHerbert Xu2014-10-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=379227 On Sat, Jul 22, 2006 at 12:48:38PM +0200, A Mennucc wrote: > Package: dash > Version: 0.5.3-3 > Severity: normal > > hi > > here are the examples > > $ bash -c 'echo -n -e "A\0102C\00D\0E" | hexdump -c' > 0000000 A B C \0 D \0 E > 0000007 > > $ /bin/echo -n -e "A\0102C\00D\0E" | hexdump -c > 0000000 A B C \0 D \0 E > 0000007 > > $ zsh -c 'echo -n -e "A\0102C\00D\0E" | hexdump -c' > 0000000 A B C \0 D \0 E > 0000007 > > $ dash -c 'echo -n "A\0102C\00D\0E" | hexdump -c' > 0000000 A B C > 0000003 > > and also > > $ dash -c 'echo -n "ABC\0DEFGH" | hexdump -c' > 0000000 A B C > 0000003 > > As you see, dash 's builtin echo truncates the output at the first \0 > > a. > > -- System Information: > Debian Release: testing/unstable > APT prefers unstable > APT policy: (500, 'unstable'), (500, 'testing') > Architecture: i386 (i686) > Shell: /bin/sh linked to /bin/bash > Kernel: Linux 2.6.16-1-k7 > Locale: LANG=it_IT.UTF-8, LC_CTYPE=it_IT.UTF-8 (charmap=UTF-8) > > Versions of packages dash depends on: > ii libc6 2.3.6-15 GNU C Library: Shared libraries > > dash recommends no packages. > > -- debconf information: > * dash/sh: false > > -- > Andrea Mennucc > "E' un mondo difficile. Che vita intensa!" (Tonino Carotone) This patch fixes handling of embedded NULs using an approach similar to the one taken by NetBSD. In particular, we first determine the length of the output string, and then use a sequence of Xs of the same length as input to the underlying C printf to determine the amount of leading and trailing padding. Finally we replace the Xs with the actual string before writing it out. In order to print out the temporary string containing Xs and padding, a new helper xasprintf is added. Unlike asprintf though, our xasprintf prints to the ash stack rather than using straight malloc memory. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Add printf support for format string a, A, and FHerbert Xu2014-10-27
| | | | | | | | This patch adds the format string characters a, A and F to the supported set of the built-in printf command. They're already supported by the underlying printf function. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [CD] support drive letters on CygwinEric Blake2014-10-27
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Cygwin platform supports DOS style drive-letter paths such as "C:\\dir", even though the preferred form is a POSIX-style "/cygdrive/c/dir". This can be seen by doing things such as chdir("c:") (which succeeds) followed by getcwd(NULL, 0) (which returns the normalized "/cygdrive/c"). However, dash was trying to perform local manipulations on the argument to 'cd' prior to calling into libc, in order to update the state of $PWD and friends; these manipulations were assuming that the user meant to change to a relative subdirectory of the current location, as in './c:', instead of honoring the drive letter. None of the other dash builtins take a filename and manipulate it to affect shell state (some, like 'test', take a file name, but as stat("c:") works just fine, there is no need to normalize). This patch has no impact outside of cygwin; on cygwin, it takes advantage of a native function call to canonicalize any incoming name into preferred form before updating shell state. Pre-patch: $ dash -c 'cd c: && echo $PWD' dash: 1: cd: can't cd to c: Post-patch: $ dash -c 'cd c: && echo $PWD' /cygdrive/c Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EXPAND] Optimise nulonly away and just use quoted as beforeHerbert Xu2014-10-08
| | | | | | | | This patch makes a small optimisation by using the same value for quoted between evalvar and varvalue by eliminating nulonly and passing along quoted instead. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EXPAND] Do not split quoted VSLENGTH and VSTRIMHerbert Xu2014-10-08
| | | | | | | Currently VSLENGTH and VSTRIM* are field-split even within quotes. This is obviously wrong. This patch fixes that. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EXPAND] Split unquoted $@/$* correctly when IFS is set but emptyHerbert Xu2014-10-08
| | | | | | | Currently we do not field-split $@/$* when it isn't quoted and IFS is set but empty. This is obviously wrong. This patch fixes this. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Use setvareq to set OPTIND initiallyHerbert Xu2014-10-07
| | | | | | | | There is no need to setvarint to set the initial value of OPTIND of one. This patch switchs to setvareq which also lets us avoid an unnecessary memory allocation. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Return without arguments in a trap should use status outside trapsHerbert Xu2014-10-06
| | | | | | | | | | | | | 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>
* [BUILTIN] Allow return in loop conditional to set exit statusHerbert Xu2014-10-06
| | | | | | | | | | | | | | | | | | https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=332954 When return is used in a loop conditional the exit status will be lost because we always set the exit status at the end of the loop to that of the last command executed in the body. This is counterintuitive and contrary to what most other shells do. This patch fixes this by always preserving the exit status of return when it is used in a loop conditional. The patch was originally written by Gerrit Pape <pape@smarden.org>. Reported-by: Stephane Chazelas <stephane_chazelas@yahoo.fr> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Move common skipcount logic into skiploopHerbert Xu2014-10-06
| | | | | | | | The functions evalloop and evalfor share the logic on checking and updating skipcount. This patch moves that into the helper function skiploop. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Do not allow break to break across function callsHerbert Xu2014-10-06
| | | | | | | | | | | As it is if you do a multi-level break inside a function it'll actually include loops outside of the function call. This is counterintuitive. This patch changes this by saving and resetting loopnest when entering a function. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Exit without arguments in a trap should use status outside trapsHerbert Xu2014-10-06
| | | | | | | | 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>
* [EVAL] Do not clobber exitstatus in evalcommandHerbert Xu2014-10-03
| | | | | | | | | | All originators of EXERROR have been setting the exitstatus for a while now. So it is no longer appropriate to set it explicitly in evalcommand. In fact doing so may cause the original exitstatus to be lost. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [ERROR] Set exitstatus in onintHerbert Xu2014-10-02
| | | | | | | | | | | | Currently the exit status when we receive SIGINT is set in evalcommand which means that it doesn't always get set. For example, if you press CTRL-C at the prompt of an interactive dash, the exit status is not set to 130 as it is in many other Bourne shells. This patch fixes this by moving the setting of the exit status into onint which also simplifies evalcommand. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [TRAP] Make sure evalskip is zero before running trapsHerbert Xu2014-10-02
| | | | | | | | | | | | | | | | | | | | | | | As it is if dotrap is called with evalskip set to a nonzero value, it'll try to execute any set traps. The result is that the first command in the first set trap will be executed while the rest of the trap will be silently ignored due to evalskip. This is highly counterintuitive, even though both bash and ksh exhibit a similar behaviour. This patch fixes it by skipping trap processing if evalskip is set on entry. It also adds a dotrap call to the top of evaltree to ensure that while continue; do continue; done has a chance of running traps. Finally the pendingsigs check is moved into dotrap for compactness. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EVAL] Fix use-after-free in dotrap/evalstringHerbert Xu2014-10-02
| | | | | | | | | | | The function dotrap calls evalstring using the stored trap string. If evalstring then unsets that exact trap string then we will end up using freed memory. This patch fixes it by making evalstring always duplicate the string before using it. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [PARSER] Add nlprompt/nlnoprompt helpersHerbert Xu2014-09-29
| | | | | | | This patch adds the nlprompt/nlnoprompt helpers to isolate code dealing with newlines and prompting. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [PARSER] Handle backslash newlines properly after dollar signHerbert Xu2014-09-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Tue, Aug 26, 2014 at 12:34:42PM +0000, Eric Blake wrote: > On 08/26/2014 06:15 AM, Oleg Bulatov wrote: > > Hi! > > > > While playing with sh generators I found that dash and bash have different > > interpretations for <slash><newline> sequence. > > > > $ dash -c 'EDIT=xxx; echo $EDIT\ > >> OR' > > xxxOR > > Buggy. > > > $ bash -c 'EDIT=xxx; echo $EDIT\ > > OR' > > /usr/bin/vim > > Correct behavior. > > > > > $ dash -c 'echo "$\ > > (pwd)"' > > $(pwd) > > > > Is it undefined behaviour in POSIX? > > No, it's well-defined, and dash is buggy. POSIX says: > > http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03 > > "the shell shall break its input into tokens by applying the first > applicable rule below to the next character in its input" > > Rule 4 covers backslash handling, while rule 5 covers locating the end > of a word to be subject to $ expansion. Therefore, rule 4 should happen > first. Rule 4 defers to the section on quoting, with the caveat that > <newline> joining is the only substitution that happens immediately as > part of the parsing: > > http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_02 > > "If a <newline> follows the <backslash>, the shell shall interpret this > as line continuation. The <backslash> and <newline> shall be removed > before splitting the input into tokens. Since the escaped <newline> is > removed entirely from the input and is not replaced by any white space, > it cannot serve as a token separator." > > So the fact that dash is treating the elided backslash-newline as a > token separator, and parsing your input as if ${EDIT}OR instead of > ${EDITOR} is a bug in dash. I agree. This patch should resolve this problem and similar ones affecting blackslash newlines after we encounter a dollar sign. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [INPUT] Kill pgetc_macroHerbert Xu2014-09-29
| | | | | | | | pgetc_macro is identical to pgetc except that it's a macro and pgetc isn't. Since there is very little performance difference on modern systems it's time to kill pgetc_macro. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Correctly handle test ! ! = !Herbert Xu2014-09-28
| | | | | | | | | | | | This patch adds a special case in testcmd for the 4-argument expression beginning with a !. Without this ! ! = ! is deemed a syntax error, which breaks POSIX. Note that this special case does not extend down into subexpressions so if ! ! = ! is used inside parentheses then a syntax error will still occur as before. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* Release 0.5.8.Herbert Xu2014-09-26
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* [MAN] Clarify "trap '' signals" syntax in manual pageJonathan Nieder2014-09-26
| | | | | | | | | | | | | When the manpage states | <action> may be null, which cause the specified signals to be ignored. it is not immediately obvious what it means for an action to be null. Clarify by explicitly referring to an empty string, as opposed to a NULL pointer or the string "null". Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [MAN] 0 and EXIT both work for exit trapsAdam Buchbinder2014-09-26
| | | | | | | | | I saw a discussion in which there was some confusion over whether or not you can use a symbolic name, since the manpage doesn't specifically say so. Signed-off-by: Adam Buchbinder <adam.buchbinder@gmail.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [MAN] Change characters for printf precision to bytesHerbert Xu2014-09-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | On Sun, Mar 09, 2014 at 11:11:43AM +0000, Jeroen van Dijke wrote: > > There seems to be a bug in the dash man page, at least in 0.5.7. It reads: > > Precision: > An optional period, `.', followed by an optional digit string giving a precision which specifies the number of digits to appear after the decimal point, for e and f formats, or the maximum number of *characters* to be printed from a string (b and s for- > mats); if the digit string is missing, the precision is treated as zero; > > dash behaves cuts to the number of bytes > > $ length=10; printf "%.${length}s\n" "eeeeeeeeeeeeeeeeeeeeeeeee" > eeeeeeeeee > $ length=10; printf "%.${length}s\n" "ëëëëëëëëëëëëëëëëëëëëëëëëë” > ëëëëë > > > The POSIX specification (2008) says: > > precision Gives the minimum number of digits to appear for the d, o, i, u, x, or X conversion specifiers (the field is padded with leading zeros), the number of digits to appear after the radix character for the e and f conversion specifiers, the maximum number of significant digits for the g conversion specifier; or the maximum number of *bytes* to be written from a string in the s conversion specifier. The precision shall take the form of a ( '.' ) followed by a decimal digit string; a null digit string is treated as zero. > > So it seems to me that “characters” should be changed to “bytes”. Indeed and this patch makes that change. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [JOBS] Fix off-by-one error for multiple of four job numbersHarald van Dijk2014-09-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On 29/07/13 23:44, Luigi Tarenga wrote: > hi list, > while writing a script to execute parallel ssh command on many host I found > a strange behavior of dash. I can replicate it with a very simple script but > didn't find any documentation about dash or POSIX that can explain it. > > tested on centos 6.4 (dash 0.5.5.1) and wih dash compiled from source (0.5.7) > the following script reports error: > > #!/bin/dash > > sleep 3 & > sleep 3 & > sleep 3 & > sleep 3 & > > #/bin/true > jobs -l > > wait %1 > wait %2 > wait %3 > wait %4 > > [vortex@lizard ~]$ ./dash-0.5.7/src/dash test.sh > [4] + 4569 Running > [3] - 4568 Running > [2] 4567 Running > [1] 4566 Running > prova: 14: wait: No such job: %4 > [vortex@lizard ~]$ echo $? > 2 Yes, this looks like a bug to me. The number of allocated jobs is always kept as a multiple of four, and the first check in considering whether the job number is valid is "if it's greater than or equal to the number of allocated job, it's invalid". That doesn't look right. That would only be right if jobs were zero-based, but they aren't. If it's exactly equal to the number of available jobs, it can still be valid. It works when adding /bin/true, because four more more jobs end up allocated internally. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Set command -p path to /usr/sbin:/usr/bin:/sbin:/binHerbert Xu2014-09-26
| | | | | | Exclude /usr/local from command -p PATH. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Small optimisation of command -pv changeHerbert Xu2014-09-26
| | | | | | | | This patch moves the pathval call into the describe_command function and also eliminates an unnecessary branch when DEBUG is off. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] command: allow combining -p with -vHarald van Dijk2014-09-26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On 10/07/13 20:18, Craig Loomis wrote: > Dash (0.5.7 and git master) does not implement 'command -p' > according to the standard, and opens an intriguing security hole to > anyone trying this scheme. > > When using 'command -v' to simply print the path to an executable, > '-p' has no effect: You're right. dash has never supported combining -p with -v, but back in 2005 this was seemingly accidentally changed from reporting a syntax error to silently ignoring the -p option, only about a month after dash moved to git. Making sure that -p is respected even when -v is used is easy enough, see attached patch. Tested even with explicit PATH overrides: PATH=/path/to/some/other/dash command -pv dash correctly outputs /bin/dash on my system. > the path that 'command -p cmd' uses is a compiled-in constant > from dash's src/var.c:defpathvar, which starts with > "/usr/local/sbin:/usr/local/bin". To me, that is both completely > unexpected and pretty scary -- /usr/local/bin is (very) often less > well secured or checked than, say, /bin: Agreed. However, IMO, it does make sense for defpathvar to start with /usr/local/*: it has two separate functions, it also serves as the default path (hence the name) when dash is started with no PATH set at all. I think fixing this should be done in a way so that command -p does not use defpathvar, not by changing defpathvar. bash uses the same confstr function for this that getconf uses, and it shouldn't be too much work to make dash use that too. If no one else comes up with a working patch or a better approach, I'll try to get that working. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Fixed argument parsing crash in testHerbert Xu2013-08-23
| | | | | | | | | When nexpr gets an unexpected EOI, this may cause crashes further up the call chain because we've advanced t_wp too far. Fix it by checking for EOI in nexpr and only advancing t_wp if we've got more arguments. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Initialise OPTIND after importing environmentHerbert Xu2013-08-23
| | | | | | | | | | | | | | | | | | | | | | | | On Sat, Mar 23, 2013 at 01:46:20AM +0000, Chris F.A. Johnson wrote: > > According to both the dash man page and the POSIX spec, "When the > shell is invoked, OPTIND is initialized to 1." > > However, it actually takes the value of the environment variable > if it exists: > > $ OPTIND=4 dash -c 'echo "$OPTIND"' > 4 > $ OPTIND=4 bash -c 'echo "$OPTIND"' > 1 > $ OPTIND=4 ksh -c 'echo "$OPTIND"' > 1 > $ OPTIND=4 ksh93 -c 'echo "$OPTIND"' > 1 This patch fixes this by initialising OPTIND after importing the environment. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Add newline when tracing in poplocalvarsPeter Rosin2013-08-23
| | | | | Signed-off-by: Peter Rosin <peda@lysator.liu.se> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [MAN] Markup fixes in manual for mandoc 1.12.1Jérémie Courrèges-Anglas2013-08-23
| | | | | | | | | with Aleksey we briefly discussed the mdoc compatibility of the manpage, here's a patch that makes mandoc 1.12.1 happier and behaves correctly against groff 1.21. I want to include it in the staging dash-0.5.7 OpenBSD port. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Use PRIdMAX instead of %j in printfHarald van Dijk2013-08-23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On 12/03/2012 05:59 PM, Harald van Dijk wrote: > On 12/03/2012 08:42 AM, Roy wrote: >> MSYS libc does not support %j[dXx] format, only %ll[dXx] is supported. >> >> diff --git a/src/bltin/printf.c b/src/bltin/printf.c >> index 893295c..12ce660 100644 >> --- a/src/bltin/printf.c >> +++ b/src/bltin/printf.c >> @@ -319,11 +319,12 @@ mklong(const char *str, const char *ch) >> char *copy; >> size_t len; >> >> - len = ch - str + 3; >> + len = ch - str + 4; >> STARTSTACKSTR(copy); >> copy = makestrspace(len, copy); >> - memcpy(copy, str, len - 3); >> - copy[len - 3] = 'j'; >> + memcpy(copy, str, len - 4); >> + copy[len - 4] = 'l'; >> + copy[len - 3] = 'l'; >> copy[len - 2] = *ch; >> copy[len - 1] = '\0'; >> return (copy); > > The calling code uses the result to print intmax_t and uintmax_t values. > Printing intmax_t values with %lld is wrong, this will only work if > intmax_t is really a typedef for long long (which may be true on your > system, but is not required by the standard). > > The other patch that Jonathan linked to should work just fine. Here's a slightly tweaked version of that patch. Regardless of whether PRIdMAX is defined as "jd" or as "lld", the use of memcpy here, first copying "jd"/"lld" and the null byte, and only changing the 'd' after that, surprisingly results in slightly shorter object code than the original byte-by-byte approach, even though memcpy is fully inlined. Perhaps that could be a reason for applying this, even if the original reason for it, making the code work on not-quite-conforming systems, isn't good enough to get it in dash. Tested with normal glibc, and with glibc hacked to not provide PRIdMAX. Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [EXPAND] Propagate EXP_QPAT in subevalvarHerbert Xu2013-08-23
| | | | | | | | | | | | | | | | | | | | | | | On Tue, Aug 28, 2012 at 01:27:24PM +0000, Todor Vlaev wrote: > > While playing around with parameter expansion I noticed that the > following didn't work in dash (dash 0.5.5.1-7.4ubuntu1) as compared > to bash even though I believe it should be POSIX-compliant: > > my_str=swan; last_char="${my_str#${my_str%?}}"; echo ${last_char} > > If the double quotes are removed, the last character is printed correctly. > > At a quick glance through the commits after the 0.5.5.1 release I saw > the following bug fix. Could it be related? > > 0d7d66039b614b642c775432fd64aa8c11f9a64d > [EXPAND] Fix quoted pattern patch breakage We need to propagate EXP_QPAT in subevalvar as otherwise a nested parameter expansion within subevalvar may be expanded incorrectly. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [MAN] Fix typo for waitKimo Rosenbaum2013-08-23
| | | | | | This is a small patch to fix the paragraph about 'wait' in the dash manpage. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [BUILTIN] Add support for ulimit -rChristoph Mathys2012-07-03
| | | | | | | | I recently found myself in need to have dash support 'ulimit -r' to set maximum realtime priority. Attached is a patch that adds the parameter to the builtin ulimit command and updates the manpage. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* Avoid overflow for very long variable nameJim Meyering2012-07-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Otherwise, this: $ perl -le 'print "v"x(2**31+1) ."=1"' | dash provokes integer overflow: (gdb) bt #0 doformat (dest=0x61d580, f=0x416a08 "%s: %d: %s: ", ap=0x7fffffffd308) at output.c:310 #1 0x00000000004128c1 in outfmt (file=0x61d580, fmt=0x416a08 "%s: %d: %s: ") at output.c:257 #2 0x000000000040382e in exvwarning2 (msg=0x417339 "Out of space", ap=0x7fffffffd468) at error.c:125 #3 0x000000000040387e in exverror (cond=1, msg=0x417339 "Out of space", ap=0x7fffffffd468) at error.c:156 #4 0x0000000000403938 in sh_error (msg=0x417339 "Out of space") at error.c:172 #5 0x000000000040c970 in ckmalloc (nbytes=18446744071562067984) at memalloc.c:57 #6 0x000000000040ca78 in stalloc (nbytes=18446744071562067972) at memalloc.c:132 #7 0x000000000040ece9 in grabstackblock (len=18446744071562067972) at memalloc.h:67 #8 0x00000000004106b5 in readtoken1 (firstc=118, syntax=0x419522 "", eofmark=0x0, striptabs=0) at parser.c:1040 #9 0x00000000004101a4 in xxreadtoken () at parser.c:826 #10 0x000000000040fe1d in readtoken () at parser.c:697 #11 0x000000000040edcc in parsecmd (interact=0) at parser.c:145 #12 0x000000000040c679 in cmdloop (top=1) at main.c:224 #13 0x000000000040c603 in main (argc=2, argv=0x7fffffffd9f8) at main.c:178 #8 0x00000000004106b5 in readtoken1 (firstc=118, syntax=0x419522 "", eofmark=0x0, striptabs=0) at parser.c:1040 1040 grabstackblock(len); (gdb) p len $30 = -2147483644 Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [VAR] Sanitise environment variable names on entryHerbert Xu2012-02-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | On Tue, Feb 14, 2012 at 10:48:48AM +0000, harald@redhat.com wrote: > > "export -p" prints all environment variables, without checking if the > environment variable is a valid dash variable name. > > IMHO, the only valid usecase for "export -p" is to eval the output. > > $ eval $(export -p); echo OK > OK > > Without this patch the following test does error out with: > > test.py: > import os > os.environ["test-test"]="test" > os.environ["test_test"]="test" > os.execv("./dash", [ './dash', '-c', 'eval $(export -p); echo OK' ]) > > $ python test.py > ./dash: 1: export: test-test: bad variable name > > Of course the results can be more evil, if the environment variable > name is crafted, that it injects valid shell code. This patch fixes the issue by sanitising all environment variable names upon entry into the shell. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [SHELL] Add top-level autogen.shDavid S. Miller2011-08-17
| | | | | Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [SHELL] Allow building without LINEO supportDavid S. Miller2011-08-17
| | | | | | | Simply specify --disable-lineno to configure. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [ARITH] Avoid imaxdiv when only one of the results is wantedHarald van Dijk2011-08-17
| | | | | | | | | | | | dash rather pointlessly calls imaxdiv, only to discard one of its results. The call was already made conditional a while back because some systems don't have imaxdiv, but the generated code for the version with imaxdiv and the one with / and % is identical (with GCC 4.6.1 or ICC 12.0.2, with -O0, -O2 or -Os), so it could just as well go entirely to clean up the code a little bit. Signed-off-by: Harald van Dijk <harald@gigawatt.nl> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
* [SHELL] Fix klibc DEBUG compilationmaximilian attems2011-07-15
| | | | | | | | | | | | | | | | | | dash didn't compile in DEBUG mode against klibc for all long time. Now it only fails at link stage for not having setlinebuf(3) and freopen(3). Fixes: usr/dash/show.o: In function `opentrace': show.c:(.text+0x36): undefined reference to `freopen' show.c:(.text+0x86): undefined reference to `setlinebuf' Skip setlinebuf and use fclose/fopen inside __KLIBC__ Compile tested with debug in klibc and against glibc in dash repo. Signed-off-by: maximilian attems <max@stro.at> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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