Ksh currently restricts readonly scalar variables from having their
values directly changed via a value assignment. However, since ksh
allows variable attributes to be altered, the variable's value can
be indirectly altered. For instance, if TMOUT=900 (for a 15 minute
idle timeout) was set to readonly, all that is needed to alter the
value of TMOUT from 900 to 0 is to issue 'typeset -R1 TMOUT',
perhaps followed by a 'typeset -i TMOUT' to turn off the shell's
timeout value.
In addition, there are problems with arrays. The following is
incorrectly allowed:
typeset -a arr=((a b c) 1)
readonly arr
arr[0][1]=d
arr=(alphas=(a b c);name=x)
readonly arr.alphas
arr.alphas[1]=([b]=5)
arr=(alphas=(a b c);name=x)
readonly arr.alphas
arr.alphas[1]=(b)
typeset -C arr=(typeset -r -a alphas=(a b c);name=x)
arr.alphas[1]=()
src/cmd/ksh93/bltins/typeset.c: setall():
- Relocate readonly attribute check higher up the code and widen
its application to issue an error message if the pre-existing
name-pair has the readonly bit flag set.
- To avoid compatibility problems, don't check for readonly if
NV_RDONLY is the only attribute set (ignoring NV_NOFREE). This
allows 'readonly foo; readonly foo' to keep working.
src/cmd/ksh93/sh/array.c: nv_endsubscript():
- Apply a readonly flag check when an array subscript or append
assignment occurs, but allow type variables (typeset -T) as they
utilize '-r' for 'required' sub-variables.
src/cmd/ksh93/tests/readonly.sh:
- New file. Create readonly tests that validate the warning message
and validate that the readonly variable did not change.
src/cmd/ksh93/sh/streval.c:
- Bump MAXLEVEL from 9 to 1024 as a workaround for arithmetic
expansion, avoiding a spurious error about too much recursion
when the readonly.sh tests are run. This change is backported
from ksh 93v-.
TODO: debug a spurious increase in arithmetic recursion level
variable when readonly.sh tests with 'typeset -i' are run.
That is a different bug for a different commit.
Co-authored-by: Martijn Dekker <martijn@inlv.org>
This commit adds an UNREACHABLE() macro that expands to either the
__builtin_unreachable() compiler builtin (for release builds) or
abort(3) (for development builds). This is used to mark code paths
that are never to be reached.
It also adds the 'noreturn' attribute to functions that never
return: path_exec(), sh_done() and sh_syntax(). The UNREACHABLE()
macro is not added after calling these.
The purpose of these is:
* to slightly improve GCC/Clang compiler optimizations;
* to fix a few compiler warnings;
* to add code clarity.
Changes of note:
src/cmd/ksh93/sh/io.c: outexcept():
- Avoid using __builtin_unreachable() here since errormsg can
return despite using ERROR_system(1), as shp->jmplist->mode is
temporarily set to 0. See: https://github.com/att/ast/issues/1336
src/cmd/ksh93/tests/io.sh:
- Add a regression test for the ksh2020 bug referenced above.
src/lib/libast/features/common:
- Detect the existence of either the C11 stdnoreturn.h header or
the GCC noreturn attribute, preferring the former when available.
- Test for the existence of __builtin_unreachable(). Use it for
release builds. On development builds, use abort() instead, which
crahses reliably for debugging when unreachable code is reached.
Co-authored-by: Martijn Dekker <martijn@inlv.org>
This commit fixes a bug in the ksh uname builtin's -d option that could
change the output of -o (I was only able to reproduce this on Linux):
$ builtin uname
$ uname -o
GNU/Linux
$ uname -d
(none)
$ uname -o
(none)
I identified this patch from ksh2020 as a fix for this bug:
<https://github.com/att/ast/pull/1187>
The linked patch was meant to fix a crash in 'uname -d', although I've
had no luck reproducing it: <https://github.com/att/ast/issues/1184>
src/lib/libcmd/uname.c:
- Pass correct buffer to getdomainname() while executing uname -d.
src/cmd/ksh93/tests/builtins.sh:
- Add a regression test for the reported 'uname -d' crash.
- Add a regression test for the output of 'uname -o' after 'uname -d'.
- To handle potential crashes when running the regression tests in older
versions of ksh, fork the command substitutions that run 'uname -d'.
This bug was first reported at <https://github.com/att/ast/issues/8>.
The 'cd' command currently takes the value of $OLDPWD from the
wrong scope. In the following example 'cd -' will change the
directory to /bin instead of /tmp:
$ OLDPWD=/bin ksh93 -c 'OLDPWD=/tmp cd -'
/bin
src/cmd/ksh93/bltins/cd_pwd.c:
- Use sh_scoped() to obtain the correct value of $OLDPWD.
- Fix a use-after-free bug. Make the 'oldpwd' variable a static
char that points to freeable memory. Each time cd is used, this
variable is freed if it points to a freeable memory address and
isn't also a pointer to shp->pwd.
src/cmd/ksh93/sh/path.c: path_pwd():
- Simplify and add comments.
- Scope $PWD properly.
src/cmd/ksh93/tests/builtins.sh,
src/cmd/ksh93/tests/leaks.sh:
- Backport the ksh2020 regression tests for 'cd -' when $OLDPWD is
set.
- Add test for $OLDPWD and $PWD after subshare.
- Add test for $PWD after 'cd'.
- Add test for possible memory leak.
- Add testing for 'unset' on OLDPWD and PWD.
src/cmd/ksh93/COMPATIBILITY:
- Add compatibility note about changes to $PWD and $OLDPWD.
Co-authored-by: Martijn Dekker <martijn@inlv.org>
This commit adds '/* FALLTHROUGH */' comments to fix many
GCC warnings when compiling with -Wimplicit-fallthrough.
Additionally, the existing fallthrough comments have been
changed for consistency.
src/cmd/ksh93/tests/variables.sh: LC_* error tests:
- Since operating systems validate locale strings differently,
try a few different bad locale strings to find one that makes
setlocale(2) fail, fixing test failures on OpenBSD and Debian.
- Restore warning removed in aed5c6d7, issuing it if none of the
bad locale strings produce a diagnostic.
- Reenable test for diagnostic message disabled in aed5c6d7.
Co-authored-by: Martijn Dekker <martijn@inlv.org>
This bug was originally reported at <https://github.com/att/ast/issues/1467>.
A crash can occur when using the 'b' or 'B' vi mode commands to go back
one word. I was able to reproduce these crashes with 100% consistency on
an OpenBSD virtual machine when ksh is compiled with -D_std_malloc.
Reproducer:
$ set -o vi
$ asdf <ESC> <b or B>
The fix is based on Matthew DeVore's analysis:
> I suspect this is caused by this line:
>> while (vi_isalph(tcur_virt) && tcur_virt >= first_virt) --tcur_virt;
> which is in the b codepath. It checks vi_isalph(tcur_virt) before checking
> if tcur_virt is in range. These two clauses should be reversed. Note that
> line 316 is a similar check for pressing B, and there the tcur_virt value
> is checked first.
src/cmd/ksh93/edit/vi.c:
- Check tcur_virt before using isalph() or isblank() to fix both crashes.
At the start of the backword() while loop this check was performed
twice, so the redundant check has been removed.
src/cmd/ksh93/tests/pty.sh:
- Add a regression test for the b, B, w and W editor commands.
src/cmd/ksh93/bltins/test.c:
- Fix the following compiler warnings from clang:
test.c:554:11: warning: assigning to 'char *' from 'const char []'
discards qualifiers
[-Wincompatible-pointer-types-discards-qualifiers]
e_msg = e_badop;
^ ~~~~~~~
test.c:556:11: warning: assigning to 'char *' from 'const char []'
discards qualifiers
[-Wincompatible-pointer-types-discards-qualifiers]
e_msg = e_unsupported_op;
^ ~~~~~~~~~~~~~~~~
test.c:560:1: warning: control may reach end of non-void function
[-Wreturn-type]
src/cmd/ksh93/tests/builtins.sh:
- Fix regression test by updating error message text.
When test is passed the '=~' operator, it will silently fail with
exit status 1:
$ test foo =~ foo; echo $?
1
This bug is caused by test_binop reaching the 'NOTREACHED' area of
code. The bugfix was adapted from ksh2020:
https://github.com/att/ast/issues/1152
src/cmd/ksh93/bltins/test.c: test_binop():
- Error out with a message suggesting usage of '[[ ... ]]' if '=~'
is passed to the test builtin.
- Special-case TEST_END (']]') as that is not really an operator.
Co-authored-by: Martijn Dekker <martijn@inlv.org>
src/lib/libast/tm/tminit.c:
- Commit 9f43f8d1, in addition to backporting fixes from ksh93v-, also
backported this bug:
$ printf '%(%Z)T' now
PPT # Should be PDT
Reapply the ksh2020 bugfix to fix the %Z time
format again.
src/cmd/ksh93/tests/builtins.sh:
- Add a regression test so this bug (hopefully) isn't backported from
ksh93v- again).
Every so often, a commit's GitHub CI run throws the following
regression test failure:
sigchld.sh[57]: expected '2 background' -- got '3' (DELAY=0.02)
When I re-run the job, the failure usually goes away.
In 712261c8 the DELAY variable was changed from 0.2 to 0.02 to
speed up the first SIGCHLD test. It's possible the GitHub CI
runners are just too slow or too heavily loaded for that.
src/cmd/ksh93/tests/sigchld.sh:
- Restore 0.2 value for 'float DELAY'.
I grepped for #include changes in all the commits and compared
that to the changes in the Mamfiles. I found 7 commits that don't
update the Mamfiles with the appropriate dependencies while
adding #includes, as I only learned how this works after having
worked with this code for some time.
This commit adds the missing Mamfile updates for the
corresponding #include changes in the following commits:
06e721c3, 65d363fd, 70fc1da7, 79d19458, b1a41311, bb4d6a2e,
db71b3ad, and this commit.
Additionally:
src/lib/libast/comp/setlocale.c:
- Change include errno.h to error.h to use EILSEQ fallback if
needed; remove corresponding #ifdef (re: 4dcf5c50, 71bfe028).
src/cmd/ksh93/Mamfile:
- Fix a broken dependency on libast FEATURE/float (re: 72968eae).
We can't use 'prev' for a file that was not mentioned before in
the same Mamfile, we have to use a 'make'...'done' on the first
mention. Add subdependencies matching those in libast/Mamfile.
src/cmd/ksh93/bltins/print.c:
- Rename the unlisted and misleadingly named SHOPT_ECHOE option
(which disables, not enables, 'echo -e') to SHOPT_NOECHOE.
src/cmd/ksh93/SHOPT.sh:
- Add the SHOPT_NOECHOE and SHOPT_TEST_L compile time options to
the list of SHOPT options. Since there is a probe for TEST_L,
set it to probe (empty) by default. NOECHE is off by default.
src/cmd/ksh93/features/options:
- Small bugfix: Allow SHOPT_TEST_L to be manually enabled on
systems that don't support '$(whence -p test) -l /foo'.
- Add a comment describing the SHOPT_MULTIBYTE feature test and
separate it from the SHOPT_DEVFD test.
This bugfix comes from <https://github.com/att/ast/pull/711>.
Eric Scrivner provided the following explanation for the fix:
> Coverity identified an issue with integer truncation in
> `put_enum`. The function was truncating the return values of
> `strcasecmp` and `strcmp` from an `int` to an `unsigned short`
> when assigning them to the local variable `n`. Since either of
> these methods can return a value that is not in the set `{0, 1,
> -1}` the later check if `n == 0` could spuriously evaluate to
> true. For example, in the case where either function returned
> `-65536`.
> The fix is simply to change `n` from an `unsigned short` to an
> `int` to avoid the possibility of truncation. Since the only
> purpose of `n` is the store the return values of these checks,
> this does not have any side effects.
That bit of code supported bash's redundant 'function foo()'
function declaration syntax (with both the 'function' keyword
and the '()') which is a syntax error on ksh, as it should be.
This allows ksh to be compiled with versions of tcc that define
__dso_handle in libtcc1.a, i.e., versions as of this commit:
https://repo.or.cz/tinycc.git/commit/dd60b20c
Older versions of tcc still fail to compile ksh, although now they
fail after reaching the libdll feature test. I'm not sure if fixing
that is feasible since even if I hack out the failing libdll
feature test, ksh fails to link with a '__dso_handle' error.
src/lib/libast/comp/atexit.c,
src/lib/libast/features/lib,
src/lib/libast/vmalloc/vmexit.c:
- From what I've been able to gather the only OSes with support
for on_exit are Linux and SunOS 4. However, on_exit takes two
arguments, so the macro that defines it as taking one argument
is incorrect. Since Solaris (SunOS 5) no longer has this call
and the macro breaks on Linux, the clean fix is to remove it
(atexit(3) is used instead).
src/lib/libast/include/ast.h:
- When compiling with tcc on FreeBSD, pretend to be gcc 2.95.3
instead of gcc 9.3.0. This stops /usr/include/math.h from
activating gcc 3.0+ math compiler builtins that don't exist on
tcc, while still identifying as gcc which is needed to avoid
other FreeBSD system header breakage.
src/cmd/builtin/Mamfile,
src/cmd/builtin/features/pty,
src/lib/libdll/Mamfile,
src/lib/libdll/features/dll:
- tcc forbids combining the -c compiler flag with -l* linker flags.
Use the -lm flag in the iffe feature tests instead of the
Mamfiles. This avoids iffe combining -lm with the -c flag.
src/lib/libast/vmalloc/malloc.c:
- Fix failure to compile with -D_std_malloc.
This patch is from OpenSUSE:
https://build.opensuse.org/package/view_file/shells/ksh/ksh93-malloc-hook.dif
As it turns out tcc needs this change to build ksh with
-D_std_malloc, so it has been applied.
Co-authored-by: Martijn Dekker <martijn@inlv.org>
Resolves: https://github.com/ksh93/ksh/issues/232
src/lib/libast/features/lib,
src/lib/libast/path/pathicase.c:
- FAT32 file systems on Linux don't support FS_CASEFOLD_FL, which
caused globbing to break. Reproducer using a UEFI boot partition:
$ echo /boot/eF*
/boot/eF*
This is fixed by checking for FAT attributes with ioctl, then
checking for FS_CASEFOLD_FL if that fails.
- The check for FS_CASEFOLD_FL didn't work correctly; I still wasn't
able to get --globcasedetect to work on a case-insensitive ext4
folder. Fix that by adding missing parentheses.
Moving the 'err_exit' and 'warning' alias definitions in the
regression tests to one _common file introduced a bug: they are no
longer expanded at compile time when the tests are run with shcomp,
resulting in a 'command not found' (at best) on trying to execute
one. shcomp requires that the alias definitions need to be present
in the file itself. But that means maintaining 50-odd copies again.
I'd rather add a hack to shtests to avoid this.
src/cmd/ksh93/tests/shtests:
- Before running a test with shcomp, physically concatenate _common
and the test script together into a temporary file, minus the '.'
command that includes _common, and compile that with shcomp.
The NOT_USED() macro is already defined in ast.h (which is included
by shell.h) as an alias of NoP(). So it's better to apply the fix
to NoP() so it takes effect for both verrsions, for libast and ksh.
One of the best-kept secrets of libast/ksh93 is that the code
includes support for case-insensitive file name generation (a.k.a.
pathname expansion, a.k.a. globbing) as well as case-insensitive
file name completion on interactive shells, depending on whether
the file system is case-insensitive or not. This is transparently
determined for each directory, so a path pattern that spans
multiple file systems can be part case-sensitive and part case-
insensitive. In more precise terms, each slash-separated path name
component pattern P is treated as ~(i:P) if its parent directory
exists on a case-insensitive file system. I recently discovered
this while dealing with <https://github.com/ksh93/ksh/issues/223>.
However, that support is dead code on almost all current systems.
It depends on pathconf(2) having a _PC_PATH_ATTRIBUTES selector.
The 'c' attribute is supposedly returned if the given directory is
on a case insensitive file system. There are other attributes as
well (at least 'l', see src/lib/libcmd/rm.c). However, I have been
unable to find any system, current or otherwise, that has
_PC_PATH_ATTRIBUTES. Google and mailing list searches yield no
relevant results at all. If anyone knows of such a system, please
add a comment to this commit on GitHub, or email me.
An exception is Cygwin/Windows, on which the "c" attribute was
simply hardcoded, so globbing/completion is always case-
insensitive. As of Windows 10, that is wrong, as it added the
possibility to mount case-sensitive file systems.
On the other hand, this was never activated on the Mac, even
though macOS has always used a case-insensitive file like Windows.
But, being UNIX, it can also mount case-sensitive file systems.
Finally, Linux added the possibility to create individual case-
insensitive ext4 directories fairly recently, in version 5.2.
https://www.collabora.com/news-and-blog/blog/2020/08/27/using-the-linux-kernel-case-insensitive-feature-in-ext4/
So, since this functionality latently exists in the code base, and
three popular OSs now have relevant file system support, we might
as well make it usable on those systems. It's a nice idea, as it
intuitively makes sense for globbing and completion behaviour to
auto-adapt to file system case insensitivity on a per-directory
basis. No other shell does this, so it's a nice selling point, too.
However, the way it is coded, this is activated unconditionally on
supported systems. That is not a good idea. It will surprise users.
Since globbing is used with commands like 'rm', we do not want
surprises. So this commit makes it conditional upon a new shell
option called 'globcasedetect'. This option is only compiled into
ksh on systems where we can actually detect FS case insensitivity.
To implement this, libast needs some public API additions first.
*** libast changes ***
src/lib/libast/features/lib:
- Add probes for the linux/fs.h and sys/ioctl.h headers.
Linux needs these to use ioctl(2) in pathicase(3) (see below).
src/lib/libast/path/pathicase.c,
src/lib/libast/include/ast.h,
src/lib/libast/man/path.3,
src/lib/libast/Mamfile:
- Add new pathicase(3) public API function. This uses whatever
OS-specific method it can detect at compile time to determine if
a particular path is on a case-insensitive file system. If no
method is available, it only sets errno to ENOSYS and returns -1.
Currently known to work on: macOS, Cygwin, Linux 5.2+, QNX 7.0+.
- On systems (if any) that have the mysterious _PC_PATH_ATTRIBUTES
selector for pathconf(2), call astconf(3) and check for the 'c'
attribute to determine case insensitivity. This should preserve
compatibility with any such system.
src/lib/libast/port/astconf.c:
- dynamic[]: As case-insensitive globbing is now optional on all
systems, do not set the 'c' attribute by default on _WINIX
(Cygwin/Windows) systems.
- format(): On systems that do not have _PC_PATH_ATTRIBUTES, call
pathicase(3) to determine the value for the "c" (case
insensitive) attribute only. This is for compatibility as it is
more efficient to call pathicase(3) directly.
src/lib/libast/misc/glob.c,
src/lib/libast/include/glob.h:
- Add new GLOB_DCASE public API flag to glob(3). This is like
GLOB_ICASE (case-insensitive matching) except it only makes the
match case-insensitive if the file system for the current
pathname component is determined to be case-insensitive.
- gl_attr(): For efficiency, call pathicase(3) directly instead of
via astconf(3).
- glob_dir(): Only call gl_attr() to determine file system case
insensitivity if the GLOB_DCASE flag was passed. This makes case
insensitive globbing optional on all systems.
- glob(): The options bitmask needs to be widened to fit the new
GLOB_DCASE option. Define this centrally in a new GLOB_FLAGMASK
macro so it is easy to change it along with GLOB_MAGIC (which
uses the remaining bits for a sanity check bit pattern).
src/lib/libast/path/pathexists.c:
- For efficiency, call pathicase(3) directly instead of via
astconf(3).
*** ksh changes ***
src/cmd/ksh93/features/options,
src/cmd/ksh93/SHOPT.sh:
- Add new SHOPT_GLOBCASEDET compile-time option. Set it to probe
(empty) by default so that the shell option is compiled in on
supported systems only, which is determined by new iffe feature
test that checks if pathicase(3) returns an ENOSYS error.
src/cmd/ksh93/data/options.c,
src/cmd/ksh93/include/shell.h:
- Add -o globcasedetect shell option if compiling with
SHOPT_GLOBCASEDET.
src/cmd/ksh93/sh/expand.c: path_expand():
- Pass the new GLOB_DCASE flag to glob(3) if the
globcasedetect/SH_GLOBCASEDET shell option is set.
src/cmd/ksh93/edit/completion.c:
- While file listing/completion is based on globbing and
automatically becomes case-insensitive when globbing does, it
needs some additional handling to make a string comparison
case-insensitive in corresponding cases. Otherwise, partial
completions may be deleted from the command line upon pressing
tab. This code was already in ksh 93u+ and just needs to be
made conditional upon SHOPT_GLOBCASEDET and globcasedetect.
- For efficiency, call pathicase(3) directly instead of via
astconf(3).
src/cmd/ksh93/sh.1:
- Document the new globcasedetect shell option.
In various places in libast and libcmd there are preprocessor
fallbacks like this, for systems that don't define all the commonly
used errno value IDs:
#ifndef ENOSYS
#define ENOSYS EINVAL
#endif
and many others. It is better to have these all in one place so
they are not duplicated and we don't risk inconsistencies when
adding new code.
src/lib/libast/include/error.h includes the OS's <errno.h>, so it
is the logical file to move all these fallbacks into.
Quite possibly there is no remotely current system that needs any
of these, but they won't do any harm either.
Most files already use <error.h> directly or indirectly. Four
needed new #include <error.h> directives to use the fallbacks if
needed. The libast Mamfile is updated to make those files depend on
that header.
These are minor fixes I've accumulated over time. The following
changes are somewhat notable:
- Added a missing entry for 'typeset -s' to the man page.
- Add strftime(3) to the 'see also' section. This and the date(1)
addition are meant to add onto the documentation for 'printf %T'.
- Removed the man page the entry for ksh reading $PWD/.profile on
login. That feature was removed in commit aa7713c2.
- Added date(1) to the 'see also' section of the man page.
- Note that the 'hash' command can be used instead of 'alias -t' to
workaround one of the caveats listed in the man page.
- Use an 'out of memory' error message rather than 'out of space'
when memory allocation fails.
- Replaced backticks with quotes in some places for consistency.
- Added missing documentation for the %P date format.
- Added missing documentation for the printf %Q and %p formats
(backported from ksh2020: https://github.com/att/ast/pull/1032).
- The comments that show each builtin's options have been updated.
In 2021, it seems like it's about time to join the 21st century
and officially require fork(2). In practice this was already the
case as the legacy code was unmaintained and didn't compile.
src/cmd/ksh93/edit/edit.c,
src/cmd/ksh93/edit/history.c,
src/cmd/ksh93/sh/deparse.c:
- Remove experimental code protected by '#ifdef future'.
No one is going to do anything with this, it's just clutter.
src/lib/libast/sfio/sfcvt.c:
- In 2021, it might be time to actually start using some C99
features were available. Change two checks for a _c99_in_the_wild
macro to actual checks for C99, enabling the use of fpclassify().
Resolves: https://github.com/ksh93/ksh/issues/219
This removes #ifdefs checking for the existence of
SH_PLUGIN_VERSION (version check for dynamically loaded builtins)
and the SFIO identifiers SF_BUFCONST, SF_CLOSING, SF_APPENDWR,
SF_ATEXIT, all of which are defined by the bundled libast.
While experimenting with #233, a memory segmentation fault occurred.
A search of other emacs issues found a potential matching issue as
described in https://github.com/att/ast/pull/791. Also, a duplicate
PR of https://github.com/att/ast/pull/1489 was submitted. This
commit backports that fix.
src/cmd/ksh93/edit/history.c: hist_word():
- Switch from using strcpy to memmove as the two strings could overlap.
This was failing again on FreeBSD. Replicating the test in a real
session worked as expected.
Apparently, we just cannot rely on external 'vi' utilities playing
well with pty. This test has caused enough trouble. Removed.
I've had ksh crash one too many times when returning to a previous
build directory as I forgot to restore the previously-used CCFLAGS.
bin/package, src/cmd/INIT/package.sh:
- Save each of CC, CCFLAGS, CCLDFLAGS, LDFLAGS, KSH_RELFLAGS on the
first build run. On subsequent runs, compare and refuse to run if
they changed, issuing an informative error message.
- Allow override by exporting FORCE_FLAGS. Don't tell anyone :)
Upon encountering two filenames with multibyte characters starting
with the same byte, a partial multibyte character was completed.
Reproducer (to run in UTF-8 locale):
$ touch XXXá XXXë
$ : XX <== pres tab
$ : XXX^? <== partial multibyte character appears
Note: á is $'\xc3\xa1' and ë is $'\xc3\xab' (same initial byte).
src/cmd/ksh93/edit/completion.c:
- Add multibyte support to the charcmp() and overlaid() functions.
Thanks to Harald van Dijk for useful code and suggestions.
- Add a few missing mbinit() calls. The state of multibyte
processing must be reset before starting a new loop in case a
previous processing run was interrupted mid-character.
src/cmd/ksh93/tests/pty.sh:
- Add test based on Harald's reproducer.
Resolves: https://github.com/ksh93/ksh/issues/223
Until now, when performing any tilde expansion like ~/foo or
~user/foo, ksh added a placeholder built-in command called
'.sh.tilde', ostensibly with the intention to allow users to
override it with a shell function or custom builtin. The multishell
ksh93 repo <https://github.com/multishell/ksh93/> shows this was
added sometime between 2002-06-28 and 2004-02-29. However, it has
never worked and crashed the shell.
This commit replaces that with something that works. Specific tilde
expansions can now be overridden using .set or .get discipline
functions associated with the .sh.tilde variable (see manual,
Discipline Functions).
For example, you can use either of:
.sh.tilde.set()
{
case ${.sh.value} in
'~tmp') .sh.value=${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}} ;;
'~doc') .sh.value=~/Documents ;;
'~ksh') .sh.value=/usr/local/src/ksh93/ksh ;;
esac
}
.sh.tilde.get()
{
case ${.sh.tilde} in
'~tmp') .sh.value=${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}} ;;
'~doc') .sh.value=~/Documents ;;
'~ksh') .sh.value=/usr/local/src/ksh93/ksh ;;
esac
}
src/cmd/ksh93/include/variables.h,
src/cmd/ksh93/data/variables.c:
- Add SH_TILDENOD for a new ${.sh.tilde} predefined variable.
It is initially unset.
src/cmd/ksh93/sh/macro.c:
- sh_btilde(): Removed.
- tilde_expand2(): Rewritten. I started out with the tiny version
of this function from the 2002-06-28 version of ksh. It uses the
stack instead of sfio, which is more efficient. A bugfix for
$HOME == '/' was retrofitted so that ~/foo does not become
//foo instead of /foo. The rest is entirely new code.
To implement the override functionality, it now checks if
${.sh.tilde} has any discipline function associated with it.
If it does, it assigns the tilde expression to ${.sh.tilde} using
nv_putval(), triggering the .set discipline, and then reads it
back using nv_getval(), triggering the .get discipline. The
resulting value is used if it is nonempty and does not still
start with a tilde.
src/cmd/ksh93/bltins/typeset.c,
src/cmd/ksh93/tests/builtins.sh:
- Since ksh no longer adds a dummy '.sh.tilde' builtin, remove the
ad-hoc hack that suppressed it from the output of 'builtin'.
src/cmd/ksh93/tests/tilde.sh:
- Add tests verifying everything I can think of, as well as tests
for bugs found and fixed during this rewrite.
src/cmd/ksh93/tests/pty.sh:
- Add test verifying that the .sh.tilde.set() discipline does not
modify the exit status value ($?) when performing tilde expansion
as part of tab completion.
src/cmd/ksh93/sh.1:
- Instead of "tilde substitution", call the basic mechanism "tilde
expansion", which is the term used everywhere else (including the
1995 Bolsky/Korn ksh book).
- Document the new override feature.
Resolves: https://github.com/ksh93/ksh/issues/217
That patch broke the build on Cygwin, where gcc apparently doesn't
have the required atomic addition/subtraction compiler builtins.
The build fails at link time with those functions not found.
As far as I know, ksh was actually working fine (after @JohnoKing's
gcc workaround in c258a04f), so I'll just revert this for now. If a
need for it is demonstrated later, we'll have to add a feature test
or find some other way to get it working on Cygwin.
The package script was not well behaved with these. When you
pressed Ctrl+C, on some shells (including ksh) both the SIGINT (2)
and EXIT (0) traps are activated, showing a double 'make done'
message. The exit status also wasn't > 128 to indicate a signal.
bin/package, src/cmd/INIT/package.sh:
- Be UNIXly well-behaved. Signals should be passed on after
handling, so when one is caught, make the trap handlers print
their message and then unset both itself and EXIT/0 before
resending the signal to self.
"savxit -= SH_EXITSIG + 128;" may have worked accidentally due to
subsequent bitmasking, but is blatantly wrong . It subtracts 256 +
128 = 384 from the exit status.
Use bitwise logic instead, with an octal literal 0200 instead of
128. This makes more sense in this context.
In ksh93r a crash can occur after switching from emacs mode to vi
mode[*]:
$ ENV=/./dev/null ksh2006 -o emacs
$ echo ${.sh.version}
Version M 1993-12-28 r
$ set -o vi
$ <Esc> <r> <r> # This triggers the memory fault
Commit 129614b9 added the OpenSUSE patch for this crash. This commit
adds the regression test for it.
[*]: https://bugzilla.opensuse.org/show_bug.cgi?id=179917
A discipline function could incorrectly influence the value of $?
(exit status of last command) outside its context if it was
triggered without another command being run, e.g. when a prompt
variable is read, or COLUMNS or LINES is set.
Reproducers include:
PS1 prompt:
$ PS1.get() { true; }
$ false
$ echo $?
0
PS2 prompt:
$ PS2.get() { return 13; }
$ \
>
$ echo $?
13
The set discipline is affected too, e.g. COLUMNS and LINES:
$ COLUMNS.set() { return 13; }
$ true
$ (press return)
$ echo $?
13
There are probably other contexts where the shell reads or changes
variables without running commands, allowing their get or set
disciplines to influence $?. So this commit makes ksh save $? for
all .get, .set, .append, and .unset discipline calls.
src/cmd/ksh93/sh/nvdisc.c:
- assign(): Save/restore $? when running a .set/.append/.unset
discipline function.
- lookup(): Save/restore $? when running a .get discipline.
src/cmd/ksh93/tests/pty.sh:
- Add a regression test for $? after displaying a prompt
and when setting a LINES.set discipline function.
src/cmd/ksh93/tests/return.sh:
- The above test fails in script form on ksh93u+ and ksh2020, as
it exposes another form of #117 that occurs after running a
subshell. Add the above regression test here as well
(re: 092b90da).
Co-authored-by: Martijn Dekker <martijn@inlv.org>
Sometimes the shell returned to the prompt before bin/package was
finished writing all of its output. The problem was that 'tee',
which is used to write the output to both the terminal and the log
in arch/*lib/package/gen/make.out, hadn't caught up yet.
bin/package, src/cmd/INIT/package.sh:
- Run the build itself in the background and 'tee' in the
foreground. This way, the script will not terminate until 'tee'
is finished. The build's exit status is obtained with 'wait'.
For most numeric types the last provided one wins out. This commit
closes the gap for -F and -i numerics to not be covered up by other
preceding float types. Note: -u for requesting an unsigned float or
integer was considered and decided to be left alone as it stands,
so as to not allow the variable to become an uppercased string if
the requested options ended with a -u. As it stands for a case when
multiple numeric types are requested, a -u option may be applied
after the last numeric type is processed.
Examples:
-EF becomes -F
-Fi becomes -i
-Fu becomes -F
-uF becomes -F
-Fui becomes -i (because isfloat==1, unsigned is not applied)
-Fiu becomes -iu (isfloat is reset and allows unsigned to be set)
src/cmd/ksh93/bltins/typeset.c: b_typeset():
- Reset attribute bit flags for -E and -X when -F is requested by
adding in NV_EXPNOTE to be removed.
- For -i option if a float precedes it, reset isfloat and -E/-F
attribute bit flags.
- Take into account the impact of the shortint flag on floats.
src/cmd/ksh93/tests/attributes.sh:
- Add some validation tests to confirm that, when a -F follows
either -E or -X, -F is used.
- Add some validation tests to confirm that, when -F/E/X precede
a -i, the variable becomes an integer and not a float.
- Add in various tests when -s followed a float.
There was an issue with tilde expansion if the HOME var is unset.
$ unset HOME
$ echo ~
martijn
Only the username is returned. Users are more likely to expect the
current user's home directory as configured in the OS.
POSIXly, the expansion of ~ is based on the value of HOME. If HOME
is unset, the results are unspecified. After unsetting HOME, in
bash, ~ returns the user's home directory as specified by the OS,
whereas in all other shells, ~ expands to the empty string. Only
ksh93 returns the username. The behaviour of bash is more useful.
Discussion:
https://github.com/ksh93/ksh/pull/225#issuecomment-799074107
src/cmd/ksh93/sh/macro.c,
src/cmd/ksh93/tests/tilde.sh:
- sh_tilde(): Backport fix by Mike Gilbert from ksh2020.
See: https://github.com/att/ast/issues/1391https://github.com/att/ast/pull/1396https://github.com/att/ast/commit/070d365d
- Add test.
src/cmd/ksh93/COMPATIBILITY:
- Note this change.
src/cmd/ksh93/tests/_common:
- Commit aed5c6d7 renamed the err_exit function,
breaking a few tests in glob.sh that call the function
directly instead of using the alias. Restore the function.
src/cmd/ksh93/tests/builtins.sh:
- The dtksh builtins don't have optget option parsing, so
skip the unrecognized options test for those (this of
course only has relevance when running dtksh against the
regression tests).
src/cmd/ksh93/tests/pty.sh:
- If the vi editor couldn't be found on the $PATH, skip the
regression test that involves it.
src/cmd/ksh93/features/options:
- SHOPT_TEST_L: Use 'env test' instead of '/bin/test' to run
external 'test', as the direct path is unportable. Create a test
symlink and verify the positive case as well as the negative.
- SHOPT_SYSRC: Use if...then..fi instead of ... && ... for the last
test to avoid a non-zero exit status of the script, which outputs
a spurious 'no' result like this:
iffe: test: cross{ ... }end ... no
- Add comments for clarity and to make the SHOPT_* names greppable.
Related: https://github.com/ksh93/ksh/issues/219
src/cmd/ksh93/tests/_common:
- Added. This keeps one common version of 'err_exit', 'warning',
and other init code.
src/cmd/ksh93/tests/*.sh:
- Source _common as a dot script.
- Remove 50-odd, occasionally slightly different, versions of the
common code.
- Some minor tweaks.
