.TH LIBAR2_TYPE_TO_STRING 3 LIBAR2
.SH NAME
libar2_type_to_string - Convert an Argon2 primitive type value to a string

.SH SYNOPSIS
.nf
#include <libar2.h>

enum libar2_argon2_type {
        LIBAR2_ARGON2D = 0,
        LIBAR2_ARGON2I = 1,
        LIBAR2_ARGON2ID = 2,
        LIBAR2_ARGON2DS = 4
};

enum libar2_casing {
        LIBAR2_LOWER_CASE,
        LIBAR2_TITLE_CASE,
        LIBAR2_UPPER_CASE
};

const char *libar2_type_to_string(enum libar2_argon2_type \fItype\fP, enum libar2_casing \fIcasing\fP);
.fi
.PP
Link with
.IR -lar2 .

.SH DESCRIPTION
The
.BR libar2_type_to_string ()
function returns a statically allocated string that
represents the value of the
.I type
parameter, which shall represent a primitive type
of Argon2 (that is, Argon2d, Argon2i, Argon2id, or
Argon2ds), using the casing specified by the
.I casing
parameter.
.PP
If the
.I casing
parameter is
.IR LIBAR2_LOWER_CASE ,
the returned string will be in all lower case,
that is, for example \(dqargon2d\(dq.
If the
.I casing
parameter is
.IR LIBAR2_TITLE_CASE ,
the first character returned string will be in
upper case, and the rest of the string will be
in lower case, that is, for example \(dqArgon2d\(dq.
If the
.I casing
parameter is
.IR LIBAR2_UPPER_CASE ,
the returned string will be in all upper case,
that is, for example \(dqARGON2D\(dq.

.SH RETURN VALUES
The
.BR libar2_type_to_string ()
function returns a statically allocated string
as described in the
.B DESCRIPTION
section upon successful completion. On error,
.I NULL
is returned and
.I errno
is set to describe the error.

.SH ERRORS
The
.BR libar2_type_to_string ()
function will fail if:
.TP
.B EINVAL
Either argument is invalid.

.SH SEE ALSO
.BR libar2 (7),
.BR libar2_string_to_type (3)