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+'\" t
+\t
+.\" Copyright 2002 walter harms (walter.harms@informatik.uni-oldenburg.de)
+.\"
+.\" SPDX-License-Identifier: GPL-1.0-or-later
+.\"
+.\" Corrected, aeb, 2002-05-30
+.\"
+.TH a64l 3 (date) "Linux man-pages (unreleased)"
+.SH NAME
+a64l, l64a \- convert between long and base-64
+.SH LIBRARY
+Standard C library
+.RI ( libc ", " \-lc )
+.SH SYNOPSIS
+.nf
+.B #include <stdlib.h>
+.P
+.BI "long a64l(const char *" str64 );
+.BI "char *l64a(long " value );
+.fi
+.P
+.RS -4
+Feature Test Macro Requirements for glibc (see
+.BR feature_test_macros (7)):
+.RE
+.P
+.BR a64l (),
+.BR l64a ():
+.nf
+    _XOPEN_SOURCE >= 500
+.\"    || _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED
+        || /* glibc >= 2.19: */ _DEFAULT_SOURCE
+        || /* glibc <= 2.19: */ _SVID_SOURCE
+.fi
+.SH 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
+.BR a64l ()
+has length greater than six, only the first six bytes are used.
+If the type
+.I long
+has more than 32 bits, then
+.BR l64a ()
+uses only the low order 32 bits of
+.IR value ,
+and
+.BR a64l ()
+sign-extends its 32-bit result.
+.P
+The 64 digits in the base-64 system are:
+.P
+.RS
+.nf
+\&\[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
+.fi
+.RE
+.P
+So 123 = 59*64\[ha]0 + 1*64\[ha]1 = "v/".
+.SH ATTRIBUTES
+For an explanation of the terms used in this section, see
+.BR attributes (7).
+.TS
+allbox;
+lbx lb lb
+l l l.
+Interface	Attribute	Value
+T{
+.na
+.nh
+.BR l64a ()
+T}	Thread safety	MT-Unsafe race:l64a
+T{
+.na
+.nh
+.BR a64l ()
+T}	Thread safety	MT-Safe
+.TE
+.SH STANDARDS
+POSIX.1-2008.
+.SH HISTORY
+POSIX.1-2001.
+.SH NOTES
+The value returned by
+.BR l64a ()
+may be a pointer to a static buffer, possibly overwritten
+by later calls.
+.P
+The behavior of
+.BR l64a ()
+is undefined when
+.I value
+is negative.
+If
+.I value
+is zero, it returns an empty string.
+.P
+These functions are broken before glibc 2.2.5
+(puts most significant digit first).
+.P
+This is not the encoding used by
+.BR uuencode (1).
+.SH SEE ALSO
+.BR uuencode (1),
+.\" .BR itoa (3),
+.BR strtoul (3)