Port to C11 aligned_alloc, and fix some integer overflows.

* configure.ac (GMALLOC_OBJ): Initialize to empty if !system_malloc
and doug_lea_malloc.
(aligned_alloc): Test for existence if !GMALLOC_OBJ and not darwin.
(posix_memalign): Test for existence only if !GMALLOC_OBJ and
not darwin and !aligned_alloc.
* src/alloc.c (USE_ALIGNED_ALLOC): New symbol.
(USE_POSIX_MEMALIGN): Remove.  All uses replaced with USE_ALIGNED_ALLOC,
and use of posix_memalign replaced with aligned_alloc.
(aligned_alloc): New function, defined or declared as needed.
* src/conf_post.h (HAVE_POSIX_MEMALIGN) [DARWIN_OS]:
Don't undef; configure.ac now does this.
* src/gmalloc.c (aligned_alloc) [MSDOS]: New decl.
(calloc, aligned_alloc): Check for integer overflow.
(aligned_alloc): Rename from memalign.  All uses changed.
(memalign): New function, an alias for aligned_alloc.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index d008f670867..2f774b87b13 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,17 @@
+2013-11-07  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Port to C11 aligned_alloc, and fix some integer overflows.
+        * alloc.c (USE_ALIGNED_ALLOC): New symbol.
+        (USE_POSIX_MEMALIGN): Remove.  All uses replaced with USE_ALIGNED_ALLOC,
+        and use of posix_memalign replaced with aligned_alloc.
+        (aligned_alloc): New function, defined or declared as needed.
+        * conf_post.h (HAVE_POSIX_MEMALIGN) [DARWIN_OS]:
+        Don't undef; configure.ac now does this.
+        * gmalloc.c (aligned_alloc) [MSDOS]: New decl.
+        (calloc, aligned_alloc): Check for integer overflow.
+        (aligned_alloc): Rename from memalign.  All uses changed.
+        (memalign): New function, an alias for aligned_alloc.
+
 2013-11-06  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * xdisp.c (redisplay_internal): Fix typo in last change.