dup3: cleanup

[gnulib.git] / lib / xalloc.h

diff --git a/lib/xalloc.h b/lib/xalloc.h
index 86b9b3e..c1bbe7e 100644 (file)
--- a/lib/xalloc.h
+++ b/lib/xalloc.h
@@ -20,6 +20,7 @@
 
 # include <stddef.h>
 
+# include "xalloc-oversized.h"
 
 # ifdef __cplusplus
 extern "C" {
@@ -65,22 +66,6 @@ void *xmemdup (void const *p, size_t s)
 char *xstrdup (char const *str)
       _GL_ATTRIBUTE_MALLOC;
 
-/* Return 1 if an array of N objects, each of size S, cannot exist due
-   to size arithmetic overflow.  S must be positive and N must be
-   nonnegative.  This is a macro, not an inline function, so that it
-   works correctly even when SIZE_MAX < N.
-
-   By gnulib convention, SIZE_MAX represents overflow in size
-   calculations, so the conservative dividend to use here is
-   SIZE_MAX - 1, since SIZE_MAX might represent an overflowed value.
-   However, malloc (SIZE_MAX) fails on all known hosts where
-   sizeof (ptrdiff_t) <= sizeof (size_t), so do not bother to test for
-   exactly-SIZE_MAX allocations on such hosts; this avoids a test and
-   branch when S is known to be 1.  */
-# define xalloc_oversized(n, s) \
-    ((size_t) (sizeof (ptrdiff_t) <= sizeof (size_t) ? -1 : -2) / (s) < (n))
-
-
 /* In the following macros, T must be an elementary or structure/union or
    typedef'ed type, or a pointer to such a type.  To apply one of the
    following macros to a function pointer or array type, you need to typedef