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Allow dest == src in memcpy() 

memcpy() needs to accept dest == src for gcc.
struct foo a, b; a = a; might be implemented using memcpy().
This commit is contained in:
sin 2015-01-29 17:55:03 +00:00
parent 474f2887ce
commit 0784beab02
1 changed files with 3 additions and 3 deletions
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6
include/string.h
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@ -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();