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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Berkeley Software Design, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _SYS__VISIBLE_H_
#define _SYS__VISIBLE_H_
/*-
* The following definitions are an extension of the behavior originally
* implemented in <sys/_posix.h>, but with a different level of granularity.
* POSIX.1 requires that the macros we test be defined before any standard
* header file is included.
*
* Here's a quick run-down of the versions (and some informal names)
* defined(_POSIX_SOURCE) 1003.1-1988
* encoded as 198808 below
* _POSIX_C_SOURCE == 1 1003.1-1990
* encoded as 199009 below
* _POSIX_C_SOURCE == 2 1003.2-1992 C Language Binding Option
* encoded as 199209 below
* _POSIX_C_SOURCE == 199309 1003.1b-1993
* (1003.1 Issue 4, Single Unix Spec v1, Unix 93)
* _POSIX_C_SOURCE == 199506 1003.1c-1995, 1003.1i-1995,
* and the omnibus ISO/IEC 9945-1: 1996
* (1003.1 Issue 5, Single Unix Spec v2, Unix 95)
* _POSIX_C_SOURCE == 200112 1003.1-2001 (1003.1 Issue 6, Unix 03)
* with _XOPEN_SOURCE=600
* _POSIX_C_SOURCE == 200809 1003.1-2008 (1003.1 Issue 7)
* IEEE Std 1003.1-2017 (Rev of 1003.1-2008) is
* 1003.1-2008 with two TCs applied and
* _XOPEN_SOURCE=700
* _POSIX_C_SOURCE == 202405 1003.1-2004 (1003.1 Issue 8), IEEE Std 1003.1-2024
* with _XOPEN_SOURCE=800
*
* In addition, the X/Open Portability Guide, which is now the Single UNIX
* Specification, defines a feature-test macro which indicates the version of
* that specification, and which subsumes _POSIX_C_SOURCE.
*
* Our macros begin with two underscores to avoid namespace screwage.
*/
/* Deal with IEEE Std. 1003.1-1990, in which _POSIX_C_SOURCE == 1. */
#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 1
#undef _POSIX_C_SOURCE /* Probably illegal, but beyond caring now. */
#define _POSIX_C_SOURCE 199009
#endif
/* Deal with IEEE Std. 1003.2-1992, in which _POSIX_C_SOURCE == 2. */
#if defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE == 2
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199209
#endif
/*
* Deal with various X/Open Portability Guides and Single UNIX Spec. We use the
* '- 0' construct so software that defines _XOPEN_SOURCE to nothing doesn't
* cause errors. X/Open CAE Specification, August 1994, System Interfaces and
* Headers, Issue 4, Version 2 section 2.2 states an empty definition means the
* same thing as _POSIX_C_SOURCE == 2. This broadly mirrors "System V Interface
* Definition, Fourth Edition", but earlier editions suggest some ambiguity.
* However, FreeBSD has histoically implemented this as a NOP, so we just
* document what it should be for now to not break ports gratuitously.
*/
#ifdef _XOPEN_SOURCE
#if _XOPEN_SOURCE - 0 >= 800
#define __XSI_VISIBLE 800
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 202405
#elif _XOPEN_SOURCE - 0 >= 700
#define __XSI_VISIBLE 700
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200809
#elif _XOPEN_SOURCE - 0 >= 600
#define __XSI_VISIBLE 600
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112
#elif _XOPEN_SOURCE - 0 >= 500
#define __XSI_VISIBLE 500
#undef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 199506
#else
/* #define _POSIX_C_SOURCE 199209 */
#endif
#endif
/*
* Deal with all versions of POSIX. The ordering relative to the tests above is
* important.
*/
#if defined(_POSIX_SOURCE) && !defined(_POSIX_C_SOURCE)
#define _POSIX_C_SOURCE 198808
#endif
#ifdef _POSIX_C_SOURCE
#if _POSIX_C_SOURCE >= 202405
#define __POSIX_VISIBLE 202405
#define __ISO_C_VISIBLE 2017
#elif _POSIX_C_SOURCE >= 200809
#define __POSIX_VISIBLE 200809
#define __ISO_C_VISIBLE 1999
#elif _POSIX_C_SOURCE >= 200112
#define __POSIX_VISIBLE 200112
#define __ISO_C_VISIBLE 1999
#elif _POSIX_C_SOURCE >= 199506
#define __POSIX_VISIBLE 199506
#define __ISO_C_VISIBLE 1990
#elif _POSIX_C_SOURCE >= 199309
#define __POSIX_VISIBLE 199309
#define __ISO_C_VISIBLE 1990
#elif _POSIX_C_SOURCE >= 199209
#define __POSIX_VISIBLE 199209
#define __ISO_C_VISIBLE 1990
#elif _POSIX_C_SOURCE >= 199009
#define __POSIX_VISIBLE 199009
#define __ISO_C_VISIBLE 1990
#else
#define __POSIX_VISIBLE 198808
#define __ISO_C_VISIBLE 0
#endif /* _POSIX_C_SOURCE */
/*
* When we've explicitly asked for a newer C version, make the C variable
* visible by default. Also honor the glibc _ISOC{11,23}_SOURCE macros
* extensions. Both glibc and OpenBSD do this, even when a more strict
* _POSIX_C_SOURCE has been requested, and it makes good sense (especially for
* pre POSIX 2024, since C11 is much nicer than the old C99 base). Continue the
* practice with C23, though don't do older standards. Also, GLIBC doesn't have
* a _ISOC17_SOURCE, so it's not implemented here. glibc has earlier ISOCxx defines,
* but we don't implement those as they are not relevant enough.
*/
#if _ISOC23_SOURCE || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 202311L)
#undef __ISO_C_VISIBLE
#define __ISO_C_VISIBLE 2023
#elif _ISOC11_SOURCE || (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L)
#undef __ISO_C_VISIBLE
#define __ISO_C_VISIBLE 2011
#endif
#else /* _POSIX_C_SOURCE */
/*-
* Deal with _ANSI_SOURCE:
* If it is defined, and no other compilation environment is explicitly
* requested, then define our internal feature-test macros to zero. This
* makes no difference to the preprocessor (undefined symbols in preprocessing
* expressions are defined to have value zero), but makes it more convenient for
* a test program to print out the values.
*
* If a program mistakenly defines _ANSI_SOURCE and some other macro such as
* _POSIX_C_SOURCE, we will assume that it wants the broader compilation
* environment (and in fact we will never get here).
*/
#if defined(_ANSI_SOURCE) /* Hide almost everything. */
#define __POSIX_VISIBLE 0
#define __XSI_VISIBLE 0
#define __BSD_VISIBLE 0
#define __ISO_C_VISIBLE 1990
#define __EXT1_VISIBLE 0
#elif defined(_C99_SOURCE) /* Localism to specify strict C99 env. */
#define __POSIX_VISIBLE 0
#define __XSI_VISIBLE 0
#define __BSD_VISIBLE 0
#define __ISO_C_VISIBLE 1999
#define __EXT1_VISIBLE 0
#elif defined(_C11_SOURCE) /* Localism to specify strict C11 env. */
#define __POSIX_VISIBLE 0
#define __XSI_VISIBLE 0
#define __BSD_VISIBLE 0
#define __ISO_C_VISIBLE 2011
#define __EXT1_VISIBLE 0
#elif defined(_C23_SOURCE) /* Localism to specify strict C23 env. */
#define __POSIX_VISIBLE 0
#define __XSI_VISIBLE 0
#define __BSD_VISIBLE 0
#define __ISO_C_VISIBLE 2023
#define __EXT1_VISIBLE 0
#else /* Default environment: show everything. */
#define __POSIX_VISIBLE 202405
#define __XSI_VISIBLE 800
#define __BSD_VISIBLE 1
#define __ISO_C_VISIBLE 2023
#define __EXT1_VISIBLE 1
#endif
#endif /* _POSIX_C_SOURCE */
/* User override __EXT1_VISIBLE */
#if defined(__STDC_WANT_LIB_EXT1__)
#undef __EXT1_VISIBLE
#if __STDC_WANT_LIB_EXT1__
#define __EXT1_VISIBLE 1
#else
#define __EXT1_VISIBLE 0
#endif
#endif /* __STDC_WANT_LIB_EXT1__ */
#endif /* !_SYS__VISIBLE_H_ */

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