byteswap.h (1434B) - Raw
1 /*- 2 * Copyright (c) 2021 M. Warner Losh <imp@FreeBSD.org> 3 * 4 * SPDX-License-Identifier: BSD-2-Clause 5 */ 6 7 /* 8 * A mostly Linux/glibc-compatible byteswap.h 9 */ 10 11 #ifndef _BYTESWAP_H_ 12 #define _BYTESWAP_H_ 13 14 /* 15 * sys/_endian.h brings in the shared interfaces between BSD's sys/endian.h, and 16 * glibc's endian.h. However, we need to include it here to get the 17 * __bswap{16,32,64} definitions that we use. sys/_endian.h has been consturcted to 18 * be compatible with including <endian.h>, <byteswap.h> or both in either order, 19 * as well as providing the BSD the bulk of sys/endian.h functionality. 20 */ 21 #include <sys/_endian.h> 22 23 /* 24 * glibc's <byteswap.h> defines the bswap_* and __bswap_* macros below. Most 25 * software uses either just <sys/endian.h>, or both <endian.h> and 26 * <byteswap.h>. However, one can't define bswap16, etc in <endian.h> because 27 * several software packages will define them only when they detect <endian.h> 28 * is included (but not when sys/endian.h is included). Defining bswap16, etc 29 * here causes compilation errors for those packages. <endian.h> and 30 * <byteswap.h> need to be paired together, with the below defines here, for 31 * the highest level of glibc compatibility. 32 */ 33 #define __bswap_16(x) __bswap16(x) 34 #define __bswap_32(x) __bswap32(x) 35 #define __bswap_64(x) __bswap64(x) 36 37 #define bswap_16(x) __bswap16(x) 38 #define bswap_32(x) __bswap32(x) 39 #define bswap_64(x) __bswap64(x) 40 41 #endif /* _BYTESWAP_H_ */