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musl/include/endian.h

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initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#ifndef _ENDIAN_H
#define _ENDIAN_H
default features: make musl usable without feature test macros the old behavior of exposing nothing except plain ISO C can be obtained by defining __STRICT_ANSI__ or using a compiler option (such as -std=c99) that predefines it. the new default featureset is POSIX with XSI plus _BSD_SOURCE. any explicit feature test macros will inhibit the default. installation docs have also been updated to reflect this change.
2012-09-08 03:13:55 +00:00
#include <features.h>
avoid "inline" in public headers for strict c89 compatibility while musl itself requires a c99 compiler, some applications insist on being compiled with c89 compilers, and use of "inline" in the headers was breaking them. much of this had been avoided already by just skipping the inline keyword in pre-c99 compilers or modes, but this new unified solution is cleaner and may/should result in better code generation in the default gcc configuration.
2012-09-02 16:46:06 +00:00
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#define __LITTLE_ENDIAN 1234
#define __BIG_ENDIAN 4321
#define __PDP_ENDIAN 3412
take byte order from gcc if gcc has defined it this only works with gcc 4.6 and later, but it allows us to support non-default endianness on archs like arm, mips, ppc, etc. that can do both without having separate header sets for both variants, and it saves one #include even on fixed-endianness archs like x86.
2012-05-06 17:40:19 +00:00
#if defined(__GNUC__) && defined(__BYTE_ORDER__)
#define __BYTE_ORDER __BYTE_ORDER__
#else
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#include <bits/endian.h>
take byte order from gcc if gcc has defined it this only works with gcc 4.6 and later, but it allows us to support non-default endianness on archs like arm, mips, ppc, etc. that can do both without having separate header sets for both variants, and it saves one #include even on fixed-endianness archs like x86.
2012-05-06 17:40:19 +00:00
#endif
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
add some ugly byte swapping cruft in endian.h
2012-04-22 15:08:01 +00:00
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#define BIG_ENDIAN __BIG_ENDIAN
#define LITTLE_ENDIAN __LITTLE_ENDIAN
#define PDP_ENDIAN __PDP_ENDIAN
#define BYTE_ORDER __BYTE_ORDER
add some ugly byte swapping cruft in endian.h
2012-04-22 15:08:01 +00:00
#include <stdint.h>
avoid "inline" in public headers for strict c89 compatibility while musl itself requires a c99 compiler, some applications insist on being compiled with c89 compilers, and use of "inline" in the headers was breaking them. much of this had been avoided already by just skipping the inline keyword in pre-c99 compilers or modes, but this new unified solution is cleaner and may/should result in better code generation in the default gcc configuration.
2012-09-02 16:46:06 +00:00
static __inline uint16_t __bswap16(uint16_t __x)
add some ugly byte swapping cruft in endian.h
2012-04-22 15:08:01 +00:00
{
return __x<<8 | __x>>8;
}
avoid "inline" in public headers for strict c89 compatibility while musl itself requires a c99 compiler, some applications insist on being compiled with c89 compilers, and use of "inline" in the headers was breaking them. much of this had been avoided already by just skipping the inline keyword in pre-c99 compilers or modes, but this new unified solution is cleaner and may/should result in better code generation in the default gcc configuration.
2012-09-02 16:46:06 +00:00
static __inline uint32_t __bswap32(uint32_t __x)
add some ugly byte swapping cruft in endian.h
2012-04-22 15:08:01 +00:00
{
return __x>>24 | __x>>8&0xff00 | __x<<8&0xff0000 | __x<<24;
}
avoid "inline" in public headers for strict c89 compatibility while musl itself requires a c99 compiler, some applications insist on being compiled with c89 compilers, and use of "inline" in the headers was breaking them. much of this had been avoided already by just skipping the inline keyword in pre-c99 compilers or modes, but this new unified solution is cleaner and may/should result in better code generation in the default gcc configuration.
2012-09-02 16:46:06 +00:00
static __inline uint64_t __bswap64(uint64_t __x)
add some ugly byte swapping cruft in endian.h
2012-04-22 15:08:01 +00:00
{
fix breakage in endian.h
2012-04-22 15:19:17 +00:00
return __bswap32(__x)+0ULL<<32 | __bswap32(__x>>32);
add some ugly byte swapping cruft in endian.h
2012-04-22 15:08:01 +00:00
}
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define htobe16(x) __bswap16(x)
#define be16toh(x) __bswap16(x)
#define betoh16(x) __bswap16(x)
#define htobe32(x) __bswap32(x)
#define be32toh(x) __bswap32(x)
#define betoh32(x) __bswap32(x)
#define htobe64(x) __bswap64(x)
#define be64toh(x) __bswap64(x)
#define betoh64(x) __bswap64(x)
#define htole16(x) (uint16_t)(x)
#define le16toh(x) (uint16_t)(x)
#define letoh16(x) (uint16_t)(x)
#define htole32(x) (uint32_t)(x)
#define le32toh(x) (uint32_t)(x)
#define letoh32(x) (uint32_t)(x)
#define htole64(x) (uint64_t)(x)
#define le64toh(x) (uint64_t)(x)
#define letoh64(x) (uint64_t)(x)
#else
#define htobe16(x) (uint16_t)(x)
#define be16toh(x) (uint16_t)(x)
#define betoh16(x) (uint16_t)(x)
#define htobe32(x) (uint32_t)(x)
#define be32toh(x) (uint32_t)(x)
#define betoh32(x) (uint32_t)(x)
#define htobe64(x) (uint64_t)(x)
#define be64toh(x) (uint64_t)(x)
#define betoh64(x) (uint64_t)(x)
#define htole16(x) __bswap16(x)
#define le16toh(x) __bswap16(x)
#define letoh16(x) __bswap16(x)
#define htole32(x) __bswap32(x)
#define le32toh(x) __bswap32(x)
#define letoh32(x) __bswap32(x)
#define htole64(x) __bswap64(x)
#define le64toh(x) __bswap64(x)
#define letoh64(x) __bswap64(x)
#endif
initial check-in, version 0.5.0
2011-02-12 05:22:29 +00:00
#endif
#endif