The maxlongsize.h header used to define the max size of
a decimal representation of the largest long int
using the size of its string representation as given in
limits.h, i.e. (simplified slightly)
#define MAXLONGSIZE MAXLONGSIZE1(ULONG_MAX)
#define MAXLONGSIZE1(x) MAXLONGSIZE2(x)
#define MAXLONGSIZE2(x) sizeof( # x )
However, the max in limits.h can be given in hex format,
e.g. 0x rather than 4294967295. Note that since
hex format requires two extra chars 0x, it will not
be shorter than the equivalent decimal representation
unless the number has 40 or more bits.
OT: Why 40? I couldn't do better than solve
2 + log16(x) = log10(x), approx. 2^39.2
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