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We xmalloc a fixed-size buffer and sprintf into it; this is
OK because the size of our formatting types is finite, but
that's not immediately clear to a reader auditing sprintf
calls. Let's switch to xstrfmt, which is shorter and
obviously correct.
Note that just dropping the common xmalloc here causes gcc
to complain with -Wmaybe-uninitialized. That's because if
"types" does not match any of our known types, we never
write anything into the "normalized" pointer. With the
current code, gcc doesn't notice because we always return a
valid pointer (just one which might point to uninitialized
data, but the compiler doesn't know that). In other words,
the current code is potentially buggy if new types are added
without updating this spot.
So let's take this opportunity to clean up the function a
bit more. We can drop the "normalized" pointer entirely, and
just return directly from each code path. And then add an
assertion at the end in case we haven't covered any cases.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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It's a common pattern to do:
foo = xmalloc(strlen(one) + strlen(two) + 1 + 1);
sprintf(foo, "%s %s", one, two);
(or possibly some variant with strcpy()s or a more
complicated length computation). We can switch these to use
xstrfmt, which is shorter, involves less error-prone manual
computation, and removes many sprintf and strcpy calls which
make it harder to audit the code for real buffer overflows.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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This strncpy is pointless; we pass the strlen() of the src
string, meaning that it works just like a memcpy. Worse,
though, is that the size has no relation to the destination
buffer, meaning it is a potential overflow. In practice,
it's not. We pass only short constant strings like
"warning: " and "error: ", which are much smaller than the
destination buffer.
We can make this much simpler by just using xsnprintf, which
will check for overflow and return the size for our next
vsnprintf, without us having to run a separate strlen().
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We generally use 32-byte buffers to format git's "type size"
header fields. These should not generally overflow unless
you can produce some truly gigantic objects (and our types
come from our internal array of constant strings). But it is
a good idea to use xsnprintf to make sure this is the case.
Note that we slightly modify the interface to
write_sha1_file_prepare, which nows uses "hdrlen" as an "in"
parameter as well as an "out" (on the way in it stores the
allocated size of the header, and on the way out it returns
the ultimate size of the header).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We sometimes sprintf into fixed-size buffers when we know
that the buffer is large enough to fit the input (either
because it's a constant, or because it's numeric input that
is bounded in size). Likewise with strcpy of constant
strings.
However, these sites make it hard to audit sprintf and
strcpy calls for buffer overflows, as a reader has to
cross-reference the size of the array with the input. Let's
use xsnprintf instead, which communicates to a reader that
we don't expect this to overflow (and catches the mistake in
case we do).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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There are several PATH_MAX-sized buffers in mailsplit, along
with some questionable uses of sprintf. These are not
really of security interest, as local mailsplit pathnames
are not typically under control of an attacker, and you
could generally only overflow a few numbers at the end of a
path that approaches PATH_MAX (a longer path would choke
mailsplit long before). But it does not hurt to be careful,
and as a bonus we lift some limits for systems with
too-small PATH_MAX varibles.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When fsck-ing alternates, we make a copy of the alternate
directory in a fixed PATH_MAX buffer. We memcpy directly,
without any check whether we are overflowing the buffer.
This is OK if PATH_MAX is a true representation of the
maximum path on the system, because any path here will have
already been vetted by the alternates subsystem. But that is
not true on every system, so we should be more careful.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Commit 02976bf (fsck: introduce `git fsck --connectivity-only`,
2015-06-22) recently gave fsck an option to perform only a
subset of the checks, by skipping the fsck_object_dir()
call. However, it does so only for the local object
directory, and we still do expensive checks on any alternate
repos. We should skip them in this case, too.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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If we encounter an error while splitting a maildir, we exit
the function early, leaking the open filehandle. This isn't
a big deal, since we exit the program soon after, but it's
easy enough to be careful.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When no branch is given to the "--reflog" option, we resolve
HEAD to get the default branch. However, if HEAD points to
an unborn branch, resolve_ref returns NULL, and we later
segfault trying to access it.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* nd/ls-remote-does-not-have-u-option:
ls-remote.txt: delete unsupported option
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There were some classes of errors that "git fsck" diagnosed to its
standard error that did not cause it to exit with non-zero status.
* jc/fsck-dropped-errors:
fsck: exit with non-zero when problems are found
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When "git am" was rewritten as a built-in, it stopped paying
attention to user.signingkey, which was fixed.
* pt/am-builtin:
am: configure gpg at startup
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"git blame --first-parent v1.0..v2.0" was not rejected but did not
limit the blame to commits on the first parent chain.
* jk/blame-first-parent:
blame: handle --first-parent
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* pt/pull-builtin:
pull: enclose <options> in brackets in the usage string
merge: grammofix in please-commit-before-merge message
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All the other placeholders are already shown that way.
Signed-off-by: Alex Henrie <alexhenrie24@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git clone --dissociate" runs a big "git repack" process at the
end, and it helps to close file descriptors that are open on the
packs and their idx files before doing so on filesystems that
cannot remove a file that is still open.
* js/clone-dissociate:
clone --dissociate: avoid locking pack files
sha1_file.c: add a function to release all packs
sha1_file: consolidate code to close a pack's file descriptor
t5700: demonstrate a Windows file locking issue with `git clone --dissociate`
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When `git clone` is asked to dissociate the repository from the
reference repository whose objects were used, it is quite possible that
the pack files need to be repacked. In that case, the pack files need to
be deleted that were originally hard-links to the reference repository's
pack files.
On platforms where a file cannot be deleted if another process still
holds a handle on it, we therefore need to take pains to release all
pack files and indexes before dissociating.
This fixes https://github.com/git-for-windows/git/issues/446
The test case to demonstrate the breakage technically does not need to
be run on Linux or MacOSX. It won't hurt, either, though.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When "git am" was rewritten as a built-in, it stopped paying
attention to user.signingkey, which was fixed.
* pt/am-builtin:
am: configure gpg at startup
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The new builtin am ignores the user.signingkey variable: gpg is being
called with the committer details as the key ID, which may not be
correct. git_gpg_config is responsible for handling that variable and is
expected to be called on initialization by any modules that use gpg.
Signed-off-by: Renee Margaret McConahy <nepella@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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It was not possible to use a repository-lookalike created by "git
worktree add" as a local source of "git clone".
* nd/clone-linked-checkout:
clone: better error when --reference is a linked checkout
clone: allow --local from a linked checkout
enter_repo: allow .git files in strict mode
enter_repo: avoid duplicating logic, use is_git_directory() instead
t0002: add test for enter_repo(), non-strict mode
path.c: delete an extra space
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Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Noticed-by: Bjørnar Snoksrud <snoksrud@gmail.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Update "git branch" that list existing branches, using the
ref-filter API that is shared with "git tag" and "git
for-each-ref".
* kn/for-each-branch:
branch: add '--points-at' option
branch.c: use 'ref-filter' APIs
branch.c: use 'ref-filter' data structures
branch: drop non-commit error reporting
branch: move 'current' check down to the presentation layer
branch: roll show_detached HEAD into regular ref_list
branch: bump get_head_description() to the top
branch: refactor width computation
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Add the '--points-at' option provided by 'ref-filter'. The option lets
the user to list only branches which points at the given object.
Add documentation and tests for the same.
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Make 'branch.c' use 'ref-filter' APIs for iterating through refs
sorting. This removes most of the code used in 'branch.c' replacing it
with calls to the 'ref-filter' library.
Make 'branch.c' use the 'filter_refs()' function provided by 'ref-filter'
to filter out tags based on the options set.
We provide a sorting option provided for 'branch.c' by using the
sorting options provided by 'ref-filter'. Also by default, we sort by
'refname'. Since 'HEAD' is alphabatically before 'refs/...' we end up
with an array consisting of the 'HEAD' ref then the local branches and
finally the remote-tracking branches.
Also remove the 'ignore' variable from ref_array_item as it was
previously used for the '--merged' option and now that is handled by
ref-filter.
Modify some of the tests in t1430 to check the stderr for a warning
regarding the broken ref. This is done as ref-filter throws a warning
for broken refs rather than directly printing them.
Add tests and documentation for the same.
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Make 'branch.c' use 'ref-filter' data structures and make changes to
support the new data structures. This is a part of the process of
porting 'branch.c' to use 'ref-filter' APIs.
This is a temporary step before porting 'branch.c' to use 'ref-filter'
completely. As this is a temporary step, most of the code introduced
here will be removed when 'branch.c' is ported over to use
'ref-filter' APIs.
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Remove the error "branch '%s' does not point at a commit" in
append_ref(), which reports branch refs which do not point to
commits. Also remove the error "some refs could not be read" in
print_ref_list() which is triggered as a consequence of the first
error.
The purpose of these codepaths is not to diagnose and report a
repository corruption. If we care about such a corruption, we
should report it from fsck instead, which we already do.
This also helps in a smooth port of branch.c to use ref-filter APIs
over the following patches. On the other hand, ref-filter ignores refs
which do not point at commits silently.
Based-on-patch-by: Jeff King <peff@peff.net>
Helped-by: Junio C Hamano <gitster@pobox.com>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We check if given ref is the current branch in print_ref_list(). Move
this check to print_ref_item() where it is checked right before
printing. This enables a smooth transition to using ref-filter APIs,
as we can later replace the current check while printing to just check
for FILTER_REFS_DETACHED instead.
Based-on-patch-by: Jeff King <peff@peff.net>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Remove show_detached() and make detached HEAD to be rolled into
regular ref_list by adding REF_DETACHED_HEAD as a kind of branch and
supporting the same in append_ref(). This eliminates the need for an
extra function and helps in easier porting of branch.c to use
ref-filter APIs.
Before show_detached() used to check if the HEAD branch satisfies the
'--contains' option, now that is taken care by append_ref().
Based-on-patch-by: Jeff King <peff@peff.net>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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This is a preperatory patch for 'roll show_detached HEAD into regular
ref_list'. This patch moves get_head_description() to the top so that
it can be used in print_ref_item().
Based-on-patch-by: Jeff King <peff@peff.net>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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| | | |_|_|_|_|_|_|_|_|_|/ / / / / / / / / /
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Remove unnecessary variables from ref_list and ref_item which were
used for width computation. This is to make ref_item similar to
ref-filter's ref_array_item. This will ensure a smooth port of
branch.c to use ref-filter APIs in further patches.
Previously the maxwidth was computed when inserting the refs into the
ref_list. Now, we obtain the entire ref_list and then compute
maxwidth.
Based-on-patch-by: Jeff King <peff@peff.net>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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There were some classes of errors that "git fsck" diagnosed to its
standard error that did not cause it to exit with non-zero status.
* jc/fsck-dropped-errors:
fsck: exit with non-zero when problems are found
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After finding some problems (e.g. a ref refs/heads/X points at an
object that is not a commit) and issuing an error message, the
program failed to signal the fact that it found an error by a
non-zero exit status.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When "git gc --auto" is backgrounded, its diagnosis message is
lost. Save it to a file in $GIT_DIR and show it next time the "gc
--auto" is run.
* nd/gc-auto-background-fix:
gc: save log from daemonized gc --auto and print it next time
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While commit 9f673f9 (gc: config option for running --auto in
background - 2014-02-08) helps reduce some complaints about 'gc
--auto' hogging the terminal, it creates another set of problems.
The latest in this set is, as the result of daemonizing, stderr is
closed and all warnings are lost. This warning at the end of cmd_gc()
is particularly important because it tells the user how to avoid "gc
--auto" running repeatedly. Because stderr is closed, the user does
not know, naturally they complain about 'gc --auto' wasting CPU.
Daemonized gc now saves stderr to $GIT_DIR/gc.log. Following gc --auto
will not run and gc.log printed out until the user removes gc.log.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* nd/ls-remote-does-not-have-u-option:
ls-remote.txt: delete unsupported option
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-u <exec> has never been supported, but it was mentioned since
0a2bb55 (git ls-remote: make usage string match manpage -
2008-11-11). Nobody has complained about it for seven years, it's
probably safe to say nobody cares. So let's remove "-u" in documents
instead of adding code to support it.
While at there, fix --upload-pack syntax too.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The previous commit enforces MAX_XDIFF_SIZE at the
interfaces to xdiff: xdi_diff (which calls xdl_diff) and
ll_xdl_merge (which calls xdl_merge).
But we have another direct call to xdl_merge in
merge-file.c. If it were written today, this probably would
just use the ll_merge machinery. But it predates that code,
and uses slightly different options to xdl_merge (e.g.,
ZEALOUS_ALNUM).
We could try to abstract out an xdi_merge to match the
existing xdi_diff, but even that is difficult. Rather than
simply report error, we try to treat large files as binary,
and that distinction would happen outside of xdi_merge.
The simplest fix is to just replicate the MAX_XDIFF_SIZE
check in merge-file.c.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When we call into xdiff to perform a diff, we generally lose
the return code completely. Typically by ignoring the return
of our xdi_diff wrapper, but sometimes we even propagate
that return value up and then ignore it later. This can
lead to us silently producing incorrect diffs (e.g., "git
log" might produce no output at all, not even a diff header,
for a content-level diff).
In practice this does not happen very often, because the
typical reason for xdiff to report failure is that it
malloc() failed (it uses straight malloc, and not our
xmalloc wrapper). But it could also happen when xdiff
triggers one our callbacks, which returns an error (e.g.,
outf() in builtin/rerere.c tries to report a write failure
in this way). And the next patch also plans to add more
failure modes.
Let's notice an error return from xdiff and react
appropriately. In most of the diff.c code, we can simply
die(), which matches the surrounding code (e.g., that is
what we do if we fail to load a file for diffing in the
first place). This is not that elegant, but we are probably
better off dying to let the user know there was a problem,
rather than simply generating bogus output.
We could also just die() directly in xdi_diff, but the
callers typically have a bit more context, and can provide a
better message (and if we do later decide to pass errors up,
we're one step closer to doing so).
There is one interesting case, which is in diff_grep(). Here
if we cannot generate the diff, there is nothing to match,
and we silently return "no hits". This is actually what the
existing code does already, but we make it a little more
explicit.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git remote" learned "get-url" subcommand to show the URL for a
given remote name used for fetching and pushing.
* bb/remote-get-url:
remote: add get-url subcommand
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Expanding `insteadOf` is a part of ls-remote --url and there is no way
to expand `pushInsteadOf` as well. Add a get-url subcommand to be able
to query both as well as a way to get all configured urls.
Signed-off-by: Ben Boeckel <mathstuf@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git blame --first-parent v1.0..v2.0" was not rejected but did not
limit the blame to commits on the first parent chain.
* jk/blame-first-parent:
blame: handle --first-parent
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The revision.c options-parser will parse "--first-parent"
for us, but the blame code does not actually respect it, as
we simply iterate over the whole list returned by
first_scapegoat(). We can fix this by returning a
truncated parent list.
Note that we could technically also do so by limiting the
return value of num_scapegoats(), but that is less robust.
We would rely on nobody ever looking at the "next" pointer
from the returned list.
Combining "--reverse" with "--first-parent" is more
complicated, and will probably involve cooperation from
revision.c. Since the desired semantics are not even clear,
let's punt on this for now, but explicitly disallow it to
avoid confusing users (this is not really a regression,
since it did something nonsensical before).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The infrastructure to rewrite "git submodule" in C is being built
incrementally. Let's polish these early parts well enough and make
them graduate to 'next' and 'master', so that the more involved
follow-up can start cooking on a solid ground.
* sb/submodule-helper:
submodule: rewrite `module_clone` shell function in C
submodule: rewrite `module_name` shell function in C
submodule: rewrite `module_list` shell function in C
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