Anyone object to the following change in libc?
Stefan Farfeleder
stefan at fafoe.narf.at
Fri Oct 31 09:20:24 PST 2003
On Fri, Oct 31, 2003 at 04:43:37PM +0100, Erik Trulsson wrote:
> Perhaps not smaller in terms of the sizeof operator, but why can't one
> have a 16-bit char, and an int8_t which occupies 16 bits, but only uses
> 8 of them - the other 8 being padding?
7.18.1.1 Exact-width integer types
1 The typedef name intN_t designates a signed integer type with width N, no padding
bits, and a two's complement representation. Thus, int8_t denotes a signed integer
type with a width of exactly 8 bits.
> Where in C99 does it say that uint8_t can't have padding bits?
> I can't find anything in n869.txt to that effect.
> As far as I can tell, the only type that is not allowed to have any
> padding bits or trap representations is unsigned char.
uint8_t is int8_t's corresponding unsigned type. This means
sizeof(uint8_t) == sizeof(int8_t), thus uint8_t can't have padding bits
either.
Cheers,
Stefan
More information about the freebsd-current
mailing list