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* include/freetype/internal/ftmemory.h (FT_OFFSET): New macro. 

Use this for `base + offset' pointer calculations where `base' can
be NULL (triggering a sanitizer warning even if the resulting
pointer gets never dereferenced since it is undefined behaviour
in C).

Suggested by Ben Wagner.
This commit is contained in:
Werner Lemberg 2019-11-23 10:28:37 +01:00
parent 9b0179597e
commit 26d0f579c0
2 changed files with 19 additions and 0 deletions
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@ -1,3 +1,14 @@
2019-11-23 Werner Lemberg <wl@gnu.org>
* include/freetype/internal/ftmemory.h (FT_OFFSET): New macro.
Use this for `base + offset' pointer calculations where `base' can
be NULL (triggering a sanitizer warning even if the resulting
pointer gets never dereferenced since it is undefined behaviour
in C).
Suggested by Ben Wagner.
2019-11-23 Ben Wagner <bungeman@google.com>
[sfnt] Ensure OTTO fonts have tables (#57285).

8
include/freetype/internal/ftmemory.h
View File

@ -57,6 +57,14 @@ FT_BEGIN_HEADER
/*************************************************************************/
/* The calculation `NULL + n' is undefined in C. Even if the resulting */
/* pointer doesn't get dereferenced, this causes warnings with */
/* sanitizers. */
/* */
/* We thus provide a macro that should be used if `base' can be NULL. */
#define FT_OFFSET( base, count ) ( (base) ? (base) + (count) : NULL )
/*
* C++ refuses to handle statements like p = (void*)anything, with `p' a
* typed pointer. Since we don't have a `typeof' operator in standard C++,