Z and Y suffixes in xstrtol.c

[isabella parakiss]

There's a problem with xstrtol.c: it cannot support Z and Y suffixes because
1024**7=1180591620717411303424 and 1024**8=1208925819614629174706176 but
STRTOL_T_MAXIMUM is (at most) UINT64_MAX=18446744073709551615.

I know this is not much of an issue since Z and Y are so rarely used, but it
causes incongruences with programs such as GNU dd.  Its man page says:

> N and BYTES may be followed by the following multiplicative suffixes: c =1,
> w =2, b =512, kB =1000, K =1024, MB =1000*1000, M =1024*1024, xM =M
> GB =1000*1000*1000, G =1024*1024*1024, and so on for T, P, E, Z, Y.

But in fact dd doesn't support them:

$ dd if=/dev/null count=1P
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000698762 s, 0.0 kB/s
$ dd if=/dev/null count=1E
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.000698762 s, 0.0 kB/s
$ dd if=/dev/null count=1Z
dd: invalid number ‘1Z’
$ dd if=/dev/null count=1Y
dd: invalid number ‘1Y’

Hope this helps.