diff options
Diffstat (limited to 'pp_pack.c')
| -rw-r--r-- | pp_pack.c | 12 |
1 files changed, 12 insertions, 0 deletions
@@ -1698,6 +1698,18 @@ S_unpack_rec(pTHX_ tempsym_t* symptr, const char *s, const char *strbeg, const c ld_bytes aldouble; SHIFT_BYTES(utf8, s, strend, aldouble.bytes, sizeof(aldouble.bytes), datumtype, needs_swap); + /* The most common long double format, the x86 80-bit + * extended precision, has either 2 or 6 unused bytes, + * which may contain garbage, which may contain + * unintentional data. While we do zero the bytes of + * the long double data in pack(), here in unpack() we + * don't, because it's really hard to envision that + * reading the long double off aldouble would be + * affected the unused bytes. + * + * Note that trying to unpack 'long doubles' of 'long + * doubles' packed in another system is in the general + * case doomed without having more detail. */ if (!checksum) mPUSHn(aldouble.ld); else |