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.\" by Klaus Klein.
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.Dd May 6, 2010
.Dt A64L 3
.Os
.Sh NAME
.Nm a64l ,
.Nm l64a ,
.Nm l64a_r
.Nd "convert between a long integer and a base-64 ASCII string"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft long
.Fn a64l "const char *s"
.Ft char *
.Fn l64a "long int l"
.Ft int
.Fn l64a_r "long int l" "char *buffer" "int buflen"
.Sh DESCRIPTION
The
.Fn a64l
and
.Fn l64a
functions convert between a long integer and its base-64 ASCII string
representation.
.Pp
The characters used to represent ``digits'' are
`.' for 0,
`/' for 1,
`0' - `9' for 2 - 11,
`A' - `Z' for 12 - 37, and
`a' - `z' for 38 - 63.
.Pp
.Fn a64l
takes a pointer to a NUL-terminated base-64 ASCII string
representation,
.Fa s ,
and returns the corresponding long integer value.
.Pp
.Fn l64a
takes a long integer value,
.Fa l ,
and returns a pointer to the corresponding NUL-terminated base-64
ASCII string representation.
.Pp
.Fn l64a_r
performs a conversion identical to that of
.Fn l64a
and stores the resulting representation in the memory area pointed to by
.Fa buffer ,
consuming at most
.Fa buflen
characters including the terminating NUL character.
.Sh RETURN VALUES
On successful completion,
.Fn a64l
returns the long integer value corresponding to the input string.
If the string pointed to by
.Fa s
is an empty string,
.Fn a64l
returns a value of 0L.
.Pp
.Fn l64a
returns a pointer to the base-64 ASCII string representation corresponding to
the input value.
If
.Fa l
is 0L,
.Fn l64a
returns a pointer to an empty string.
.Pp
On successful completion,
.Fn l64a_r
returns 0; if
.Fa buffer
is of insufficient length, -1 is returned.
.Sh SEE ALSO
.Xr strtol 3
.Sh STANDARDS
The
.Fn a64l
and
.Fn l64a
functions conform to
.St -xpg4.2
and
.St -p1003.1-2004 .
The
.Fn l64a_r
function conforms to
.St -svid4 ,
Multithreading Extension.
.Sh BUGS
The
.Fn l64a
function is not reentrant.
The value returned by it points into a static buffer area;
subsequent calls to
.Fn la64a
may overwrite this buffer.
In multi-threaded applications,
.Fn l64a_r
should be used instead.