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68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
/*
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*
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* (c) 2004 Laurent Vivier <LaurentVivier@wanadoo.fr>
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*
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*/
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#include <endian.h>
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#if __BYTE_ORDER == __BIG_ENDIAN
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/* nothing to do, because m68k is big endian too */
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static inline u_int16_t read_short(u_int16_t* addr)
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{
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return *addr;
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}
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static inline void write_short(u_int16_t* addr, u_int16_t value)
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{
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*addr = value;
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}
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static inline u_int32_t read_long(u_int32_t* addr)
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{
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return *addr;
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}
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static inline void write_long(u_int32_t* addr, u_int32_t value)
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{
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*addr = value;
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}
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#else /* __BYTE_ORDER == __LITTLE_ENDIAN */
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/* little endian (or unknown), read byte by byte to get it in good order */
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static inline u_int16_t read_short(u_int16_t* addr)
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{
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unsigned char* baddr = (unsigned char*)addr;
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return ((u_int16_t)(*baddr) << 8) | (u_int16_t)*(baddr+1);
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}
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static inline void write_short(u_int16_t* addr, u_int16_t value)
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{
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unsigned char* baddr = (unsigned char*)addr;
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*baddr = (unsigned char)(value>>8);
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*(baddr+1) = (unsigned char)value;
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}
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static inline u_int32_t read_long(u_int32_t* addr)
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{
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u_int16_t* saddr = (u_int16_t*)addr;
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return ((u_int32_t)read_short(saddr) << 16) |
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(u_int32_t)read_short(saddr+1);;
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}
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static inline void write_long(u_int32_t* addr, u_int32_t value)
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{
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u_int16_t* saddr = (u_int16_t*)addr;
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write_short(saddr, (u_int16_t)(value>>16));
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write_short(saddr+1, (u_int16_t)value);
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}
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#endif
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