The expression "1 << 31" will cause UBSAN to complain with this error message:
runtime error: left shift of 1 by 31 places cannot be represented in type 'int'
The same operation on unsigned types is fine, however. This CL replaces the
strings "1 <<" with "1U <<".
In fcLangCountrySets, it may happen that two charsets for the same
language but different territories are found in different FcChar32
"buckets" (different "columns" on the same line). This is currently the
case for the following pairs:
mn-cn and mn-mn
pap-an and pap-aw
The FcLangSetCompare() code so far used to return FcLangDifferentLang
instead of FcLangDifferentTerritory when comparing:
an FcLangSet containing only mn-cn with one containing only mn-mn
or
an FcLangSet containing only pap-an with one containing only pap-aw
This commit fixes this problem.
FcLangSetIndex() indicates "not found" with a non-negative return value.
Return value 0 doesn't imply "not found", it rather means "language
found at index 0 in fcLangCharSets".
This commit fixes a bug that can be reproduced like this:
- remove all languages starting with 'a' in fc-lang/Makefile.am (in
ORTH's definition);
- rebuild fontconfig with this change (-> new fc-lang/fclang.h);
- create an FcLangSet 'ls1' that contains at least the first language
from fcLangCharSets (i.e., the first *remaining* in lexicographic
order); let's assume it is "ba" for the sake of this description;
- create an FcLangSet 'ls2' that only contains the language "aa" (any
language starting with 'a' should work as well);
- check the return value of FcLangSetContains(ls1, ls2);
The expected return value is FcFalse, however it is FcTrue if you use
the code before this commit.
What happens is that FcLangSetIndex() returns 0, because this is the
index of the first slot after the not-found language "aa" in
fcLangCharSets (since we removed all languages starting with 'a').
However, this index happens to be non-negative, therefore
FcLangSetContainsLang() mistakenly infers that the language "aa" was
found in fcLangCharSets, and thus calls FcLangSetBitGet(ls1, 0), which
returns FcTrue since we've put the first remaining language "ba" in the
'ls1' language set.
The "return -low;" statement previously in FcLangSetIndex() was
inconsistent with the final return statement. "return -(low+1);" fixes
this inconsistency as well as the incorrect behavior described above.
FcTypeVoid is likely to happen when 'lang' and 'charset'
is deleted by 'delete' or 'delete_all' mode in edit.
Without this change, any modification on them are simply
ignored.
This is useful to make a lot of changes, particularly
when one wants to add a few and delete a lot say.
Protect cache against future expansions of FcLangSet (adding new
orth files). Previously, doing so could change the size of
that struct. Indeed, that happened between 2.6.0 and 2.7.3, causing
crashes. Unfortunately, sizeof(FcLangSet) was not checked in fcarch.c.
This changes FcLangSet code to be able to cope with struct size changes.
And change cache format, hence bumping from 2 to 3.
Fontconfig assigns an index number to each language it knows about.
The index is used to index a bit in FcLangSet language map. The bit
map is stored in the cache.
Previously fc-lang simply sorted the list of languages and assigned
them an index starting from zero. Net effect is that whenever new
orth files were added, all the FcLangSet info in the cache files would
become invalid. This was causing weird bugs like this one:
https://bugzilla.redhat.com/show_bug.cgi?id=490888
With this commit we fix the index assigned to each language. The index
will be based on the order the orth files are passed to fc-lang. As a
result all orth files are explicitly listed in Makefile.am now, and
new additions should be made to the end of the list. The list is made
to reflect the sorted list of orthographies from 2.6.0 released followed
by new additions since.
This fixes the stability problem. Needless to say, recreating caches
is necessary before any new orthography is recognized in existing fonts,
but at least the existing caches are still valid and don't cause bugs
like the above.
Using a simple shell script that processes the public headers, two header
files are constructed that map public symbols to hidden internal aliases
avoiding the assocated PLT entry for referring to a public symbol.
A few mistakes in the FcPrivate/FcPublic annotations were also discovered
through this process
Replace all of the bank/id pairs with simple offsets, recode several
data structures to always use offsets inside the library to avoid
conditional paths. Exposed data structures use pointers to hold offsets,
setting the low bit to distinguish between offset and pointer.
Use offset-based data structures for lang charset encodings; eliminates
separate data structure format for that file.
Much testing will be needed; offsets are likely not detected everywhere in
the library yet.
added by the new ALIGN macro. Fix alignment problems on ia64 and s390
by bumping up block_ptr appropriately. (Earlier version by Andreas
Schwab).
Use sysconf to determine proper PAGESIZE value; this appears to be
POSIX-compliant. (reported by Andreas Schwab)
reviewed by: plam
Alan Coopersmith
Tom Anderson
Behdad Esfahbod
Akira TAGOH
Josselin Mouette
Florent Rougon
Keith Packard
Keith Packard
Keith Packard
Patrick Lam