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libast: Update cdt(3): Allow empty strings in (dt)trees

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This backports most of the Cdt (container data types) mechanism
from the ksh 93v- beta, based on ground work done by OpenSUSE:
https://build.opensuse.org/package/view_file/shells/ksh/ksh93-dttree-crash.dif
plus adaptations to match ksh 93u+m and an updated manual page
(src/lib/libast/man/cdt.3) added directly from the 93v- sources.

| Thu Dec 20 12:48:02 UTC 2012 - werner@suse.de
|
| - Add ksh93-dttree-crash.dif - Allow empty strings in (dt)trees
|   (bnc#795324)
|
| Fri Oct 25 14:07:57 UTC 2013 - werner@suse.de
|
| - Rework patch ksh93-dttree-crash.dif

As usual, precious little information is available because the
OpenSUSE bug report is currently closed to the public:
https://bugzilla.opensuse.org/show_bug.cgi?id=795324

However, a cursory inspection suggests that this code contains
improvements to do with concurrent processing and related
robustness. The new cdt.3 manual page adds a lot about that.

This has been in production use on OpenSUSE for a long time,
so hopefully this will make ksh a little more stable again.
Only one way to find out: let's commit and test this...

BTW, to get a nice manual, use groff and ghostscript's ps2pdf:
$ groff -tman src/lib/libast/man/cdt.3 | ps2pdf - cdt.3.pdf
This commit is contained in:
Martijn Dekker 2021-01-28 02:29:55 +00:00
parent aa2644ab84
commit cc4927529b
21 changed files with 708 additions and 210 deletions
Download patch file Download diff file Expand all files Collapse all files

22
src/lib/libast/cdt/dtopen.c
View file

@ -153,25 +153,3 @@ void _dtfree(Dt_t* dt, Dtlink_t* l, int type)
if(disc->link < 0) /* free holder */
(void)(*dt->memoryf)(dt, (Void_t*)l, 0, disc);
}
int dtuserlock(Dt_t* dt, unsigned int key, int type)
{
if(type > 0)
return asolock(&dt->data->user.lock, key, ASO_LOCK);
else if(type < 0)
return asolock(&dt->data->user.lock, key, ASO_UNLOCK);
else return asolock(&dt->data->user.lock, key, ASO_TRYLOCK);
}
Void_t* dtuserdata(Dt_t* dt, Void_t* data, unsigned int key)
{
if(key == 0)
return dt->data->user.data;
else if(dtuserlock(dt, key, 1) < 0 )
return NIL(Void_t*);
else
{ dt->data->user.data = data;
dtuserlock(dt, key, -1);
return data;
}
}