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Merged Charles's enhancements to SWAP macros into new db.h

This commit is contained in:
proven 1993-04-26 17:15:31 +00:00
parent cafbea0969
commit d5a918fb1d
1 changed files with 7 additions and 34 deletions
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41
include/db.h
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@ -38,6 +38,7 @@
#include <sys/types.h>
#include <sys/cdefs.h>
#include <machine/endian.h>
#define RET_ERROR -1 /* Return values. */
#define RET_SUCCESS 0
@ -144,26 +145,9 @@ typedef struct {
* BLPSWAP swap a referenced memory location
* BLSWAP_COPY swap from one location to another
*/
#define BLSWAP(a) { \
u_long _tmp = a; \
((char *)&a)[0] = ((char *)&_tmp)[3]; \
((char *)&a)[1] = ((char *)&_tmp)[2]; \
((char *)&a)[2] = ((char *)&_tmp)[1]; \
((char *)&a)[3] = ((char *)&_tmp)[0]; \
}
#define BLPSWAP(a) { \
u_long _tmp = *(u_long *)a; \
((char *)a)[0] = ((char *)&_tmp)[3]; \
((char *)a)[1] = ((char *)&_tmp)[2]; \
((char *)a)[2] = ((char *)&_tmp)[1]; \
((char *)a)[3] = ((char *)&_tmp)[0]; \
}
#define BLSWAP_COPY(a, b) { \
((char *)&(b))[0] = ((char *)&(a))[3]; \
((char *)&(b))[1] = ((char *)&(a))[2]; \
((char *)&(b))[2] = ((char *)&(a))[1]; \
((char *)&(b))[3] = ((char *)&(a))[0]; \
}
#define BLSWAP(a) { a = __byte_swap_long(a); }
#define BLPSWAP(a) BLSWAP((*a))
#define BLSWAP_COPY(a, b) { b = __byte_swap_long(a); }
/*
* Little endian <==> big endian short swap macros.
@ -171,20 +155,9 @@ typedef struct {
* BSPSWAP swap a referenced memory location
* BSSWAP_COPY swap from one location to another
*/
#define BSSWAP(a) { \
u_short _tmp = a; \
((char *)&a)[0] = ((char *)&_tmp)[1]; \
((char *)&a)[1] = ((char *)&_tmp)[0]; \
}
#define BSPSWAP(a) { \
u_short _tmp = *(u_short *)a; \
((char *)a)[0] = ((char *)&_tmp)[1]; \
((char *)a)[1] = ((char *)&_tmp)[0]; \
}
#define BSSWAP_COPY(a, b) { \
((char *)&(b))[0] = ((char *)&(a))[1]; \
((char *)&(b))[1] = ((char *)&(a))[0]; \
}
#define BSSWAP(a) { a = __byte_swap_word(a); }
#define BSPSWAP(a) BSSWAP((*a))
#define BSSWAP_COPY(a, b) { b = __byte_swap_word(a); }
__BEGIN_DECLS
DB *dbopen __P((const char *, int, int, DBTYPE, const void *));