1A64L(3)                    Linux Programmer's Manual                   A64L(3)
2
3
4

NAME

6       a64l, l64a - convert between long and base-64
7

SYNOPSIS

9       #include <stdlib.h>
10
11       long a64l(char *str64);
12
13       char *l64a(long value);
14
15

DESCRIPTION

17       These  functions  provide a conversion between 32-bit long integers and
18       little-endian base-64 ASCII strings (of length zero to  six).   If  the
19       string  used  as  argument for a64l() has length greater than six, only
20       the first six bytes are used.  If longs have more than  32  bits,  then
21       l64a()  uses  only  the  low  order  32 bits of value, and a64l() sign-
22       extends its 32-bit result.
23
24       The 64 digits in the base 64 system are:
25              '.'  represents a 0
26              '/'  represents a 1
27              0-9  represent  2-11
28              A-Z  represent 12-37
29              a-z  represent 38-63
30       So 123 = 59*64^0 + 1*64^1 = "v/".
31

NOTES

33       The value returned by a64l() may be a pointer to a static buffer,  pos‐
34       sibly overwritten by later calls.
35
36       The  behaviour  of l64a() is undefined when value is negative. If value
37       is zero, it returns an empty string.
38
39       These functions are broken in glibc before 2.2.5 (puts most significant
40       digit first).
41
42       This is not the encoding used by uuencode(1).
43

CONFORMING TO

45       POSIX.1-2001.
46

SEE ALSO

48       uuencode(1), itoa(3), strtoul(3)
49
50
51
52                                  2002-02-15                           A64L(3)