- Implement cuio_apply(), an equivalent to m_apply(9).
- Implement CUIO_SKIP() macro which is only responsible for skipping the given number of bytes from iovec list. This allows to avoid duplicating the same code in three functions. Reviewed by: sam
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parent
7a9adfdd85
commit
8f91d4abe9
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=158698
@ -40,6 +40,23 @@ __FBSDID("$FreeBSD$");
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#include <opencrypto/cryptodev.h>
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/*
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* This macro is only for avoiding code duplication, as we need to skip
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* given number of bytes in the same way in three functions below.
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*/
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#define CUIO_SKIP() do { \
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KASSERT(off >= 0, ("%s: off %d < 0", __func__, off)); \
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KASSERT(len >= 0, ("%s: len %d < 0", __func__, len)); \
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while (off > 0) { \
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KASSERT(iol >= 0, ("%s: empty in skip", __func__)); \
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if (off < iov->iov_len) \
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break; \
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off -= iov->iov_len; \
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iol--; \
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iov++; \
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} \
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} while (0)
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void
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cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
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{
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@ -47,22 +64,9 @@ cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
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int iol = uio->uio_iovcnt;
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unsigned count;
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if (off < 0)
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panic("cuio_copydata: off %d < 0", off);
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if (len < 0)
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panic("cuio_copydata: len %d < 0", len);
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while (off > 0) {
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if (iol == 0)
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panic("iov_copydata: empty in skip");
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if (off < iov->iov_len)
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break;
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off -= iov->iov_len;
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iol--;
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iov++;
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}
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CUIO_SKIP();
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while (len > 0) {
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if (iol == 0)
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panic("cuio_copydata: empty");
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KASSERT(iol >= 0, ("%s: empty", __func__));
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count = min(iov->iov_len - off, len);
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bcopy(((caddr_t)iov->iov_base) + off, cp, count);
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len -= count;
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@ -80,22 +84,9 @@ cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
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int iol = uio->uio_iovcnt;
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unsigned count;
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if (off < 0)
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panic("cuio_copyback: off %d < 0", off);
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if (len < 0)
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panic("cuio_copyback: len %d < 0", len);
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while (off > 0) {
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if (iol == 0)
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panic("cuio_copyback: empty in skip");
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if (off < iov->iov_len)
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break;
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off -= iov->iov_len;
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iol--;
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iov++;
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}
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CUIO_SKIP();
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while (len > 0) {
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if (iol == 0)
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panic("uio_copyback: empty");
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KASSERT(iol >= 0, ("%s: empty", __func__));
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count = min(iov->iov_len - off, len);
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bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
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len -= count;
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@ -137,3 +128,31 @@ cuio_getptr(struct uio *uio, int loc, int *off)
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return (NULL);
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}
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/*
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* Apply function f to the data in an iovec list starting "off" bytes from
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* the beginning, continuing for "len" bytes.
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*/
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int
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cuio_apply(struct uio *uio, int off, int len, int (*f)(void *, void *, u_int),
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void *arg)
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{
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struct iovec *iov = uio->uio_iov;
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int iol = uio->uio_iovcnt;
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unsigned count;
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int rval;
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CUIO_SKIP();
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while (len > 0) {
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KASSERT(iol >= 0, ("%s: empty", __func__));
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count = min(iov->iov_len - off, len);
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rval = (*f)(arg, ((caddr_t)iov->iov_base) + off, count);
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if (rval)
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return (rval);
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len -= count;
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off = 0;
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iol--;
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iov++;
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}
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return (0);
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}
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