.TH LIBAR2_STRING_TO_TYPE 7 LIBAR2
.SH NAME
libar2_string_to_type - Convert a string to an Argon2 primitive type value

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

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

int libar2_string_to_type(const char *\fIstr\fP, enum libar2_argon2_type *\fItypep\fP);
.fi
.PP
Link with
.IR -lar2 .

.SH DESCRIPTION
The
.BR libar2_string_to_type ()
function converts a string, provided via the
.I str
parameter, to a Argon2 primitive type and stores
the constant that represents that type in
.IR *typep .
.PP
The strings \(dqargon2d\(dq, \(dqargon2i\(dq,
\(dqargon2id\(dq, and \(dqargon2ds\(dq are the
currently recognised strings, and are converted to
.IR LIBAR2_ARGON2D ,
.IR LIBAR2_ARGON2I ,
.IR LIBAR2_ARGON2ID ,
and.
.IR LIBAR2_ARGON2DS ,
respectively.
.PP
The
.BR libar2_string_to_type ()
is case-insensitive and will recognise the
dollar-sign
.RB ( $ )
character, or a NUL byte, as the end of the
string.
.PP
Neither argument may be
.IR NULL .

.SH RETURN VALUES
The
.BR libar2_string_to_type ()
function returns 0, and sets
.I *typep
to the value that
.I str
represents, upon successful completion.
On error, -1 is returned and
.I errno
is set to describe the error.

.SH ERRORS
The
.BR libar2_string_to_type ()
function will fail if:
.TP
.B EINVAL
.I str
does not represent a recognised Argon2 function
or is not formatted according to the specifications
in the
.B DESCRIPTION
section.

.SH SEE ALSO
.BR libar2 (7),
.BR libar2_type_to_string (3)