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iovec: macros to manipulate len and base together
A set of convenience macros to initialize struct iovec's and increment the base and length together. IOVEC_INIT - sets iov_base and iov_len IOVEC_INIT_CSTR - takes a string and sets iov_len to strlen + 1 IOVEC_INIT_OBJ - takes an object and sets iov_len to sizeof obj IOVEC_ADVANCE - increments iov_base and decrements iov_len On CheriBSD these present the opportunity to insert more precise bounds on some objects and hide differences in casts in hybrid kernels (where some, but not all pointers are capabilities and require annotation). Here in FreeBSD the resulting code is tidier, particularly in the IOVEC_ADVANCE case where the need to cast iov_base to (char *) is avoided. Reviewed by: kib Feedback from: des, jrtc27 MFC after: 1 week Sponsored by: AFRL, DARPA Differential Revision: https://reviews.freebsd.org/D45422
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@ -44,4 +44,28 @@ struct iovec {
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size_t iov_len; /* Length. */
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};
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#ifdef _KERNEL
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#define IOVEC_INIT(iovp, base, len) \
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*(iovp) = (struct iovec){ .iov_base = (base), .iov_len = (len) }
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/* String with length including NUL terminator */
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#define IOVEC_INIT_CSTR(iovp, str) do { \
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void *__str = (str); \
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IOVEC_INIT(iovp, __str, strlen(__str) + 1); \
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} while(0)
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/* Object with size from sizeof() */
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#define IOVEC_INIT_OBJ(iovp, obj) \
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IOVEC_INIT(iovp, &(obj), sizeof(obj))
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#define IOVEC_ADVANCE(iovp, amt) do { \
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struct iovec *__iovp = (iovp); \
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size_t __amt = (amt); \
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KASSERT(__amt <= __iovp->iov_len, ("%s: amount %zu > iov_len \
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%zu", __func__, __amt, __iovp->iov_len)); \
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__iovp->iov_len -= __amt; \
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__iovp->iov_base = (char *)__iovp->iov_base + __amt; \
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} while(0)
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#endif /* _KERNEL */
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#endif /* !_SYS__IOVEC_H_ */
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