move alignment check from aligned_alloc to posix_memalign

C11 has no requirement that the alignment be a multiple of
sizeof(void*), and in fact seems to require any "valid alignment
supported by the implementation" to work. since the alignment of char
is 1 and thus a valid alignment, an alignment argument of 1 should be
accepted.

diff --git a/src/malloc/aligned_alloc.c b/src/malloc/aligned_alloc.c
index 158dba4..c638662 100644 (file)
--- a/src/malloc/aligned_alloc.c
+++ b/src/malloc/aligned_alloc.c
@@ -11,7 +11,7 @@ void *aligned_alloc(size_t align, size_t len)
        unsigned char *mem, *new, *end;
        size_t header, footer;
 
-       if ((align & -align & -sizeof(void *)) != align) {
+       if ((align & -align) != align) {
                errno = EINVAL;
                return NULL;
        }

diff --git a/src/malloc/posix_memalign.c b/src/malloc/posix_memalign.c
index 42cf274..ad4d8f4 100644 (file)
--- a/src/malloc/posix_memalign.c
+++ b/src/malloc/posix_memalign.c
@@ -3,6 +3,7 @@
 
 int posix_memalign(void **res, size_t align, size_t len)
 {
+       if (align < sizeof(void *)) return EINVAL;
        void *mem = aligned_alloc(align, len);
        if (!mem) return errno;
        *res = mem;