.\"	$OpenBSD: ERR_load_strings.3,v 1.8 2024/07/26 03:40:43 tb Exp $
.\"	OpenSSL 05ea606a May 20 20:52:46 2016 -0400
.\"
.\" This file was written by Ulf Moeller <ulf@openssl.org>.
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.Dd $Mdocdate: July 26 2024 $
.Dt ERR_LOAD_STRINGS 3
.Os
.Sh NAME
.Nm ERR_load_strings ,
.Nm ERR_PACK ,
.Nm ERR_get_next_error_library
.Nd load arbitrary OpenSSL error strings
.Sh SYNOPSIS
.In openssl/err.h
.Ft void
.Fo ERR_load_strings
.Fa "int lib"
.Fa "ERR_STRING_DATA str[]"
.Fc
.Ft unsigned long
.Fo ERR_PACK
.Fa "int lib"
.Fa "int func"
.Fa "int reason"
.Fc
.Ft int
.Fn ERR_get_next_error_library void
.Sh DESCRIPTION
.Fn ERR_load_strings
registers error strings for library number
.Fa lib .
.Pp
.Fa str
is an array of error string data:
.Bd -literal -offset indent
typedef struct ERR_string_data_st {
        unsigned long error;
        char *string;
} ERR_STRING_DATA;
.Ed
.Pp
The error code is generated from the library number and a function and
reason code:
.Pp
.Dl error = ERR_PACK(lib, func, reason)
.Pp
.Fn ERR_PACK
is a macro.
.Pp
The last entry in the array is
.Brq 0 , Dv NULL .
.Pp
.Fn ERR_get_next_error_library
can be used to assign library numbers to user libraries at runtime.
.Sh RETURN VALUES
.Fn ERR_PACK
returns the error code.
.Fn ERR_get_next_error_library
returns a new library number.
.Sh SEE ALSO
.Xr ERR 3
.Sh HISTORY
.Fn ERR_load_strings
and
.Fn ERR_PACK
first appeared in SSLeay 0.4.4.
.Fn ERR_get_next_error_library
first appeared in SSLeay 0.9.0.
These functions have been available since
.Ox 2.4 .