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Minor, add a zero length tolerant memset, hb_memset

This commit is contained in:
Ebrahim Byagowi 2019-10-10 09:21:08 +03:30
parent e17e744300
commit 670fec231d
2 changed files with 10 additions and 3 deletions
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10
src/hb-algs.hh
View File

@ -588,10 +588,18 @@ hb_memcmp (const void *a, const void *b, unsigned int len)
/* It's illegal to pass NULL to memcmp(), even if len is zero.
* So, wrap it.
* https://sourceware.org/bugzilla/show_bug.cgi?id=23878 */
if (!len) return 0;
if (unlikely (!len)) return 0;
return memcmp (a, b, len);
}
static inline void *
hb_memset (void *s, int c, unsigned int n)
{
/* It's illegal to pass NULL to memset(), even if n is zero. */
if (unlikely (!n)) return 0;
return memset (s, c, n);
}
static inline bool
hb_unsigned_mul_overflows (unsigned int count, unsigned int size)
{

3
src/hb-buffer.cc
View File

@ -324,8 +324,7 @@ hb_buffer_t::clear_positions ()
out_len = 0;
out_info = info;
if (likely (len))
memset (pos, 0, sizeof (pos[0]) * len);
hb_memset (pos, 0, sizeof (pos[0]) * len);
}
void