| 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_ */ |