OPENSSL_FILE, OPENSSL_LINE, OPENSSL_FUNC, OPENSSL_MSTR, OPENSSL_MSTR_HELPER - generic C programming

       Copyright 2018-2019 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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
       <https://www.openssl.org/source/license.html>.

3.5.0                                              2025-06-04                                 OPENSSL_FILE(3SSL)

       The macros OPENSSL_FILE and OPENSSL_LINE typically yield the current filename and line number during C
       compilation.  When OPENSSL_NO_FILENAMES is defined they yield "" and 0, respectively.

       The macro OPENSSL_FUNC attempts to yield the name of the C function currently being compiled, as far as
       language and compiler versions allow.  Otherwise, it yields "(unknown function)".

       The macro OPENSSL_MSTR yields the expansion of the macro given as argument, which is useful for
       concatenation with string constants.  The macro OPENSSL_MSTR_HELPER is an auxiliary macro for this
       purpose.

OPENSSL_FUNC, OPENSSL_MSTR, and OPENSSL_MSTR_HELPER were added in OpenSSL 3.0.

       OPENSSL_FILE, OPENSSL_LINE, OPENSSL_FUNC, OPENSSL_MSTR, OPENSSL_MSTR_HELPER - generic C programming
       utility macros

       see above

crypto(7)

        #include <openssl/macros.h>

        #define OPENSSL_FILE /* typically: __FILE__ */
        #define OPENSSL_LINE /* typically: __LINE__ */
        #define OPENSSL_FUNC /* typically: __func__ */

        #define OPENSSL_MSTR_HELPER(x) #x
        #define OPENSSL_MSTR(x) OPENSSL_MSTR_HELPER(x)