These functions provide a conversion between 32-bit long integers
and little-endian base-64 ASCII strings (of length zero to six).
If the string used as argument for
has length greater than six, only the first six bytes are used.
If the type
has more than 32 bits, then
uses only the low order 32 bits of
sign-extends its 32-bit result.
The 64 digits in the base-64 system are:
'.' represents a 0
'/' represents a 1
0-9 represent 2-11
A-Z represent 12-37
a-z represent 38-63
So 123 = 59*64^0 + 1*64^1 = "v/".
The value returned by
may be a pointer to a static buffer, possibly overwritten
by later calls.
The behavior of
is undefined when
is zero, it returns an empty string.
These functions are broken in glibc before 2.2.5
(puts most significant digit first).