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Remove more nonstandard stuff from cosmopolitan.h

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Fixes #61
This commit is contained in:
Justine Tunney 2021-02-28 23:42:35 -08:00
parent 5e069a64d4
commit d932948fb4
954 changed files with 1095 additions and 1342 deletions
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25
libc/bits/xchg.internal.h Normal file
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@ -0,0 +1,25 @@
#ifndef COSMOPOLITAN_LIBC_BITS_XCHG_H_
#define COSMOPOLITAN_LIBC_BITS_XCHG_H_
#include "libc/str/str.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
/**
* Exchanges *MEMORY into *LOCALVAR.
*
* @return *MEMORY
* @see lockcmpxchg()
* todo(jart): what's the point of this?
*/
#define xchg(MEMORY, LOCALVAR) \
({ \
autotype(MEMORY) Memory = (MEMORY); \
typeof(Memory) LocalVar = (LOCALVAR); \
typeof(*Memory) Temp; \
memcpy(&Temp, Memory, sizeof(Temp)); \
memcpy(Memory, LocalVar, sizeof(Temp)); \
memcpy(LocalVar, &Temp, sizeof(Temp)); \
Temp; \
})
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_BITS_XCHG_H_ */