'\" te
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.\" Copyright 1989 AT&T
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.TH A64L 3C "Jul 24, 2002"
.SH NAME
a64l, l64a \- convert between long integer and base-64 ASCII string
.SH SYNOPSIS
.LP
.nf
#include <stdlib.h>

\fBlong\fR \fBa64l\fR(\fBconst char *\fR\fIs\fR);
.fi

.LP
.nf
\fBchar *\fR\fBl64a\fR(\fBlong\fR \fIl\fR);
.fi

.SH DESCRIPTION
.sp
.LP
These functions maintain numbers stored in base-64 \fBASCII\fR characters that
define a notation by which long integers can be represented by up to six
characters. Each character represents a "digit" in a radix-64 notation.
.sp
.LP
The characters used to represent "digits" are as follows:
.sp

.sp
.TS
box;
l | l
l | l .
Character	Digit
_
\fB\&.\fR	\fB0\fR
\fB/\fR	\fB1\fR	
\fB0-9\fR	\fB2-11\fR	
\fBA-Z\fR	\fB12-37\fR
\fBa-z\fR	\fB38-63\fR
.TE

.sp
.LP
The \fBa64l()\fR function takes a pointer to a null-terminated base-64
representation and returns a corresponding \fBlong\fR value.  If the string
pointed to by \fIs\fR contains more than six characters, \fBa64l()\fR uses the
first six.
.sp
.LP
The \fBa64l()\fR function scans the character string from left to right with
the least significant digit on the left, decoding each character as a 6-bit
radix-64 number.
.sp
.LP
The \fBl64a()\fR function takes a \fBlong\fR argument and returns a pointer to
the corresponding base-64 representation. If the argument is 0, \fBl64a()\fR
returns a pointer to a null string.
.sp
.LP
The value returned by \fBl64a()\fR is a pointer into a static buffer, the
contents of which are overwritten by each call.  In the case of multithreaded
applications, the return value is a pointer to thread specific data.
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	MT-Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBattributes\fR(5), \fBstandards\fR(5)