a64l, l64a - convert between long and base-64
long a64l(const char *str64);
char *l64a(long value);
Feature Test Macro Requirements for glibc (see feature_test_macros
_XOPEN_SOURCE >= 500
|| /* Glibc since 2.19: */ _DEFAULT_SOURCE
|| /* Glibc versions <= 2.19: */ _SVID_SOURCE
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 long
has more than 32 bits, then
() uses only the low order 32 bits of value
() 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/".
For an explanation of the terms used in this section, see attributes
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
is zero, it returns an empty string.
These functions are broken in glibc before 2.2.5 (puts most significant digit
This is not the encoding used by uuencode