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A64L
Section: Linux Programmer's Manual (3)
Updated: 2010-09-20
Index
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NAME
a64l, l64a - convert between long and base-64
SYNOPSIS
#include <stdlib.h>
long a64l(char *str64);
char *l64a(long value);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
a64l(),
l64a():
-
_SVID_SOURCE || _XOPEN_SOURCE >= 500 ||
_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
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 the type
long
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:
-
aq.aq represents a 0
aq/aq 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/".
CONFORMING TO
POSIX.1-2001.
NOTES
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 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).
SEE ALSO
uuencode(1),
strtoul(3)
COLOPHON
This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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