=pod =head1 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 =head1 SYNOPSIS #include 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_func_error_string(unsigned long e); const char *ERR_reason_error_string(unsigned long e); =head1 DESCRIPTION ERR_error_string() generates a human-readable string representing the error code I, and places it at I. I must be at least 256 bytes long. If I is B, 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 ERR_error_string_n() instead. ERR_error_string_n() is a variant of ERR_error_string() that writes at most I characters (including the terminating 0) and truncates the string if necessary. For ERR_error_string_n(), I may not be B. The string will have the following format: error:[error code]:[library name]:[function name]:[reason string] I is an 8 digit hexadecimal number, I, I and I are ASCII text. ERR_lib_error_string(), ERR_func_error_string() and ERR_reason_error_string() return the library name, function name and reason string respectively. If there is no text string registered for the given error code, the error string will contain the numeric code. L can be used to print all error codes currently in the queue. =head1 RETURN VALUES ERR_error_string() returns a pointer to a static buffer containing the string if I B<== NULL>, I otherwise. ERR_lib_error_string(), ERR_func_error_string() and ERR_reason_error_string() return the strings, and B if none is registered for the error code. =head1 SEE ALSO L, L =head1 COPYRIGHT Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at L. =cut