Allow dest == src in memcpy()

memcpy() needs to accept dest == src for gcc.
struct foo a, b; a = a; might be implemented using memcpy().

1 files changed, 3 insertions, 3 deletions

diff --git a/include/string.h b/include/string.h
index e464eab..21e853e 100644
--- a/include/string.h
+++ b/include/string.h
@@ -20,9 +20,9 @@ __fortify_memcpy(void *__restrict dest, const void *__restrict src, size_t n)
         if (__builtin_constant_p(n) && n > bos)
                 __memcpy_error();
 
-        /* trap if pointers are overlapping */
-        if ((d <= s && d + n > s) ||
-            (s <= d && s + n > d))
+        /* trap if pointers are overlapping but not if dest == src */
+        if ((d < s && d + n > s) ||
+            (s < d && s + n > d))
                 __builtin_trap();
         if (n > bos)
                 __builtin_trap();