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.\" ========================================================================
.\"
.IX Title "ERR_ERROR_STRING 3ossl"
.TH ERR_ERROR_STRING 3ossl "2024-09-03" "3.1.7+quic" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
ERR_error_string, ERR_error_string_n, ERR_lib_error_string,
ERR_func_error_string, ERR_reason_error_string \- obtain human\-readable
error message
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/err.h>
\&
\& char *ERR_error_string(unsigned long e, char *buf);
\& void ERR_error_string_n(unsigned long e, char *buf, size_t len);
\&
\& const char *ERR_lib_error_string(unsigned long e);
\& const char *ERR_reason_error_string(unsigned long e);
.Ve
.PP
Deprecated in OpenSSL 3.0:
.PP
.Vb 1
\& const char *ERR_func_error_string(unsigned long e);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBERR_error_string()\fR generates a human-readable string representing the
error code \fIe\fR, and places it at \fIbuf\fR. \fIbuf\fR must be at least 256
bytes long. If \fIbuf\fR is \fB\s-1NULL\s0\fR, the error string is placed in a
static buffer.
Note that this function is not thread-safe and does no checks on the size
of the buffer; use \fBERR_error_string_n()\fR instead.
.PP
\&\fBERR_error_string_n()\fR is a variant of \fBERR_error_string()\fR that writes
at most \fIlen\fR characters (including the terminating 0)
and truncates the string if necessary.
For \fBERR_error_string_n()\fR, \fIbuf\fR may not be \fB\s-1NULL\s0\fR.
.PP
The string will have the following format:
.PP
.Vb 1
\& error:[error code]:[library name]::[reason string]
.Ve
.PP
\&\fIerror code\fR is an 8 digit hexadecimal number, \fIlibrary name\fR and
\&\fIreason string\fR are \s-1ASCII\s0 text.
.PP
\&\fBERR_lib_error_string()\fR and \fBERR_reason_error_string()\fR return the library
name and reason string respectively.
.PP
If there is no text string registered for the given error code,
the error string will contain the numeric code.
.PP
\&\fBERR_print_errors\fR\|(3) can be used to print
all error codes currently in the queue.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBERR_error_string()\fR returns a pointer to a static buffer containing the
string if \fIbuf\fR \fB== \s-1NULL\s0\fR, \fIbuf\fR otherwise.
.PP
\&\fBERR_lib_error_string()\fR and \fBERR_reason_error_string()\fR return the strings,
and \fB\s-1NULL\s0\fR if none is registered for the error code.
.PP
\&\fBERR_func_error_string()\fR returns \s-1NULL.\s0
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3),
\&\fBERR_print_errors\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBERR_func_error_string()\fR became deprecated in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.