#ifndef __CARES_RULES_H #define __CARES_RULES_H /* Copyright (C) 2009 - 2021 by Daniel Stenberg et al * * Permission to use, copy, modify, and distribute this software and its * documentation for any purpose and without fee is hereby granted, provided * that the above copyright notice appear in all copies and that both that * copyright notice and this permission notice appear in supporting * documentation, and that the name of M.I.T. not be used in advertising or * publicity pertaining to distribution of the software without specific, * written prior permission. M.I.T. makes no representations about the * suitability of this software for any purpose. It is provided "as is" * without express or implied warranty. */ /* ================================================================ */ /* COMPILE TIME SANITY CHECKS */ /* ================================================================ */ /* * NOTE 1: * ------- * * All checks done in this file are intentionally placed in a public * header file which is pulled by ares.h when an application is * being built using an already built c-ares library. Additionally * this file is also included and used when building the library. * * If compilation fails on this file it is certainly sure that the * problem is elsewhere. It could be a problem in the ares_build.h * header file, or simply that you are using different compilation * settings than those used to build the library. * * Nothing in this file is intended to be modified or adjusted by the * c-ares library user nor by the c-ares library builder. * * Do not deactivate any check, these are done to make sure that the * library is properly built and used. * * You can find further help on the c-ares development mailing list: * http://lists.haxx.se/listinfo/c-ares/ * * NOTE 2 * ------ * * Some of the following compile time checks are based on the fact * that the dimension of a constant array can not be a negative one. * In this way if the compile time verification fails, the compilation * will fail issuing an error. The error description wording is compiler * dependent but it will be quite similar to one of the following: * * "negative subscript or subscript is too large" * "array must have at least one element" * "-1 is an illegal array size" * "size of array is negative" * * If you are building an application which tries to use an already * built c-ares library and you are getting this kind of errors on * this file, it is a clear indication that there is a mismatch between * how the library was built and how you are trying to use it for your * application. Your already compiled or binary library provider is the * only one who can give you the details you need to properly use it. */ /* * Verify that some macros are actually defined. */ #ifndef CARES_TYPEOF_ARES_SOCKLEN_T # error "CARES_TYPEOF_ARES_SOCKLEN_T definition is missing!" Error Compilation_aborted_CARES_TYPEOF_ARES_SOCKLEN_T_is_missing #endif /* * Macros private to this header file. */ #define CareschkszEQ(t, s) sizeof(t) == s ? 1 : -1 #define CareschkszGE(t1, t2) sizeof(t1) >= sizeof(t2) ? 1 : -1 /* * Verify that the size previously defined and expected for * ares_socklen_t is actually the same as the one reported * by sizeof() at compile time. */ typedef char __cares_rule_02__ [CareschkszEQ(ares_socklen_t, sizeof(CARES_TYPEOF_ARES_SOCKLEN_T))]; /* * Verify at compile time that the size of ares_socklen_t as reported * by sizeof() is greater or equal than the one reported for int for * the current compilation. */ typedef char __cares_rule_03__ [CareschkszGE(ares_socklen_t, int)]; /* ================================================================ */ /* EXTERNALLY AND INTERNALLY VISIBLE DEFINITIONS */ /* ================================================================ */ /* * Get rid of macros private to this header file. */ #undef CareschkszEQ #undef CareschkszGE /* * Get rid of macros not intended to exist beyond this point. */ #undef CARES_PULL_WS2TCPIP_H #undef CARES_PULL_SYS_TYPES_H #undef CARES_PULL_SYS_SOCKET_H #undef CARES_TYPEOF_ARES_SOCKLEN_T #endif /* __CARES_RULES_H */