a64l, l64a - convert between long and base-64
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 a64l() has length greater
than six, only the first six bytes are used. If the type
has more than 32 bits, then l64a() uses only the low
order 32 bits of
value, and a64l()
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 l64a() may be a pointer to a static buffer, possibly overwritten by later calls.
The behavior of l64a() is undefined when
value is negative. If
value is zero, it returns an
These functions are broken in glibc before 2.2.5 (puts most significant digit first).
This is not the encoding used by uuencode(1).
This page is part of release 5.10 of the Linux
project. A description of the project, information about reporting bugs,
and the latest version of this page, can be found at