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- Implement cuio_apply(), an equivalent to m_apply(9).

Browse Source 
- 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
This commit is contained in:
Pawel Jakub Dawidek 2006-05-17 17:56:00 +00:00
parent 7a9adfdd85
commit 8f91d4abe9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=158698
1 changed files with 49 additions and 30 deletions
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79
sys/opencrypto/criov.c
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@ -40,6 +40,23 @@ __FBSDID("$FreeBSD$");
#include <opencrypto/cryptodev.h>
/*
* This macro is only for avoiding code duplication, as we need to skip
* given number of bytes in the same way in three functions below.
*/
#define CUIO_SKIP() do { \
KASSERT(off >= 0, ("%s: off %d < 0", __func__, off)); \
KASSERT(len >= 0, ("%s: len %d < 0", __func__, len)); \
while (off > 0) { \
KASSERT(iol >= 0, ("%s: empty in skip", __func__)); \
if (off < iov->iov_len) \
break; \
off -= iov->iov_len; \
iol--; \
iov++; \
} \
} while (0)
void
cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
{
@ -47,22 +64,9 @@ cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
int iol = uio->uio_iovcnt;
unsigned count;
if (off < 0)
panic("cuio_copydata: off %d < 0", off);
if (len < 0)
panic("cuio_copydata: len %d < 0", len);
while (off > 0) {
if (iol == 0)
panic("iov_copydata: empty in skip");
if (off < iov->iov_len)
break;
off -= iov->iov_len;
iol--;
iov++;
}
CUIO_SKIP();
while (len > 0) {
if (iol == 0)
panic("cuio_copydata: empty");
KASSERT(iol >= 0, ("%s: empty", __func__));
count = min(iov->iov_len - off, len);
bcopy(((caddr_t)iov->iov_base) + off, cp, count);
len -= count;
@ -80,22 +84,9 @@ cuio_copyback(struct uio* uio, int off, int len, caddr_t cp)
int iol = uio->uio_iovcnt;
unsigned count;
if (off < 0)
panic("cuio_copyback: off %d < 0", off);
if (len < 0)
panic("cuio_copyback: len %d < 0", len);
while (off > 0) {
if (iol == 0)
panic("cuio_copyback: empty in skip");
if (off < iov->iov_len)
break;
off -= iov->iov_len;
iol--;
iov++;
}
CUIO_SKIP();
while (len > 0) {
if (iol == 0)
panic("uio_copyback: empty");
KASSERT(iol >= 0, ("%s: empty", __func__));
count = min(iov->iov_len - off, len);
bcopy(cp, ((caddr_t)iov->iov_base) + off, count);
len -= count;
@ -137,3 +128,31 @@ cuio_getptr(struct uio *uio, int loc, int *off)
return (NULL);
}
/*
* Apply function f to the data in an iovec list starting "off" bytes from
* the beginning, continuing for "len" bytes.
*/
int
cuio_apply(struct uio *uio, int off, int len, int (*f)(void *, void *, u_int),
void *arg)
{
struct iovec *iov = uio->uio_iov;
int iol = uio->uio_iovcnt;
unsigned count;
int rval;
CUIO_SKIP();
while (len > 0) {
KASSERT(iol >= 0, ("%s: empty", __func__));
count = min(iov->iov_len - off, len);
rval = (*f)(arg, ((caddr_t)iov->iov_base) + off, count);
if (rval)
return (rval);
len -= count;
off = 0;
iol--;
iov++;
}
return (0);
}