a64l(3) -- Linux man page
NAME
a64l, l64a - convert between long and base-64
SYNOPSIS
#include <stdlib.h>
long a64l(char *str64);
char *l64a(long value);
DESCRIPTION
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 longs have 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/".
NOTES
The value returned by
a64l()
may be a pointer to a static buffer, possibly overwritten
by later calls.
The behaviour of
l64a()
is undefined when
value
is negative. If
value
is zero, it returns an empty string.
These functions are broken in glibc before 2.2.5
(puts most significant digit first).
This is not the encoding used by
uuencode(1).
CONFORMING TO
XPG 4.2, POSIX 1003.1-2001.
SEE ALSO
uuencode(1),
itoa(3),
strtoul(3)
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