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A64L

Section: Linux Programmer's Manual (3)
Updated: 2015-03-02
Index Return to Main Contents
 

NAME

a64l, l64a - convert between long and base-64  

SYNOPSIS

#include <stdlib.h>

long a64l(const 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/".  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
l64a() Thread safetyMT-Unsafe race:l64a
a64l() Thread safetyMT-Safe
 

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 3.81 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.


 

Index

NAME
SYNOPSIS
DESCRIPTION
ATTRIBUTES
CONFORMING TO
NOTES
SEE ALSO
COLOPHON


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