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// Copyright © Tavian Barnes <tavianator@tavianator.com>
// SPDX-License-Identifier: 0BSD
/**
* Configuration and feature/platform detection.
*/
#ifndef BFS_CONFIG_H
#define BFS_CONFIG_H
#include <stddef.h>
#if __STDC_VERSION__ < 202311L
# include <stdalign.h>
# include <stdbool.h>
# include <stdnoreturn.h>
#endif
// bfs packaging configuration
#ifndef BFS_COMMAND
# define BFS_COMMAND "bfs"
#endif
#ifndef BFS_VERSION
# define BFS_VERSION "3.0.4"
#endif
#ifndef BFS_HOMEPAGE
# define BFS_HOMEPAGE "https://tavianator.com/projects/bfs.html"
#endif
// Check for system headers
#ifdef __has_include
#if __has_include(<mntent.h>)
# define BFS_HAS_MNTENT_H true
#endif
#if __has_include(<paths.h>)
# define BFS_HAS_PATHS_H true
#endif
#if __has_include(<sys/acl.h>)
# define BFS_HAS_SYS_ACL_H true
#endif
#if __has_include(<sys/capability.h>)
# define BFS_HAS_SYS_CAPABILITY_H true
#endif
#if __has_include(<sys/extattr.h>)
# define BFS_HAS_SYS_EXTATTR_H true
#endif
#if __has_include(<sys/mkdev.h>)
# define BFS_HAS_SYS_MKDEV_H true
#endif
#if __has_include(<sys/param.h>)
# define BFS_HAS_SYS_PARAM_H true
#endif
#if __has_include(<sys/sysmacros.h>)
# define BFS_HAS_SYS_SYSMACROS_H true
#endif
#if __has_include(<sys/xattr.h>)
# define BFS_HAS_SYS_XATTR_H true
#endif
#if __has_include(<threads.h>)
# define BFS_HAS_THREADS_H true
#endif
#if __has_include(<util.h>)
# define BFS_HAS_UTIL_H true
#endif
#else // !__has_include
#define BFS_HAS_MNTENT_H __GLIBC__
#define BFS_HAS_PATHS_H true
#define BFS_HAS_SYS_ACL_H true
#define BFS_HAS_SYS_CAPABILITY_H __linux__
#define BFS_HAS_SYS_EXTATTR_H __FreeBSD__
#define BFS_HAS_SYS_MKDEV_H false
#define BFS_HAS_SYS_PARAM_H true
#define BFS_HAS_SYS_SYSMACROS_H __GLIBC__
#define BFS_HAS_SYS_XATTR_H __linux__
#define BFS_HAS_THREADS_H (!__STDC_NO_THREADS__)
#define BFS_HAS_UTIL_H __NetBSD__
#endif // !__has_include
#ifndef BFS_USE_MNTENT_H
# define BFS_USE_MNTENT_H BFS_HAS_MNTENT_H
#endif
#ifndef BFS_USE_PATHS_H
# define BFS_USE_PATHS_H BFS_HAS_PATHS_H
#endif
#ifndef BFS_USE_SYS_ACL_H
# define BFS_USE_SYS_ACL_H BFS_HAS_SYS_ACL_H
#endif
#ifndef BFS_USE_SYS_CAPABILITY_H
# define BFS_USE_SYS_CAPABILITY_H (BFS_HAS_SYS_CAPABILITY_H && !__FreeBSD__)
#endif
#ifndef BFS_USE_SYS_EXTATTR_H
# define BFS_USE_SYS_EXTATTR_H BFS_HAS_SYS_EXTATTR_H
#endif
#ifndef BFS_USE_SYS_MKDEV_H
# define BFS_USE_SYS_MKDEV_H BFS_HAS_SYS_MKDEV_H
#endif
#ifndef BFS_USE_SYS_PARAM_H
# define BFS_USE_SYS_PARAM_H BFS_HAS_SYS_PARAM_H
#endif
#ifndef BFS_USE_SYS_SYSMACROS_H
# define BFS_USE_SYS_SYSMACROS_H BFS_HAS_SYS_SYSMACROS_H
#endif
#ifndef BFS_USE_SYS_XATTR_H
# define BFS_USE_SYS_XATTR_H BFS_HAS_SYS_XATTR_H
#endif
#ifndef BFS_USE_THREADS_H
# define BFS_USE_THREADS_H BFS_HAS_THREADS_H
#endif
#ifndef BFS_USE_UTIL_H
# define BFS_USE_UTIL_H BFS_HAS_UTIL_H
#endif
// Stub out feature detection on old/incompatible compilers
#ifndef __has_feature
# define __has_feature(feat) false
#endif
#ifndef __has_c_attribute
# define __has_c_attribute(attr) false
#endif
#ifndef __has_attribute
# define __has_attribute(attr) false
#endif
// Platform detection
// Get the definition of BSD if available
#if BFS_USE_SYS_PARAM_H
# include <sys/param.h>
#endif
#ifndef __GLIBC_PREREQ
# define __GLIBC_PREREQ(maj, min) false
#endif
// Fundamental utilities
/**
* Get the length of an array.
*/
#define countof(array) (sizeof(array) / sizeof(0[array]))
/**
* False sharing/destructive interference/largest cache line size.
*/
#ifdef __GCC_DESTRUCTIVE_SIZE
# define FALSE_SHARING_SIZE __GCC_DESTRUCTIVE_SIZE
#else
# define FALSE_SHARING_SIZE 64
#endif
/**
* True sharing/constructive interference/smallest cache line size.
*/
#ifdef __GCC_CONSTRUCTIVE_SIZE
# define TRUE_SHARING_SIZE __GCC_CONSTRUCTIVE_SIZE
#else
# define TRUE_SHARING_SIZE 64
#endif
/**
* Alignment specifier that avoids false sharing.
*/
#define cache_align alignas(FALSE_SHARING_SIZE)
// Wrappers for attributes
/**
* Silence compiler warnings about switch/case fall-throughs.
*/
#if __has_c_attribute(fallthrough)
# define fallthru [[fallthrough]]
#elif __has_attribute(fallthrough)
# define fallthru __attribute__((fallthrough))
#else
# define fallthru ((void)0)
#endif
/**
* Adds compiler warnings for bad printf()-style function calls, if supported.
*/
#if __has_attribute(format)
# define BFS_FORMATTER(fmt, args) __attribute__((format(printf, fmt, args)))
#else
# define BFS_FORMATTER(fmt, args)
#endif
/**
* Check if function multiversioning via GNU indirect functions (ifunc) is supported.
*/
#ifndef BFS_USE_TARGET_CLONES
# if __has_attribute(target_clones) && (__GLIBC__ || __FreeBSD__ || __NetBSD__)
# define BFS_USE_TARGET_CLONES true
# endif
#endif
#endif // BFS_CONFIG_H
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