/* $OpenBSD: criov.c,v 1.16 2006/12/29 13:04:37 pedro Exp $ */ /* * Copyright (c) 1999 Theo de Raadt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/errno.h> #include <sys/malloc.h> #include <sys/kernel.h> #include <sys/mbuf.h> #include <uvm/uvm_extern.h> #include <crypto/cryptodev.h> void cuio_copydata(struct uio *uio, int off, int len, caddr_t cp) { struct iovec *iov = uio->uio_iov; 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++; } while (len > 0) { if (iol == 0) panic("cuio_copydata: empty"); count = min(iov->iov_len - off, len); bcopy(((caddr_t)iov->iov_base) + off, cp, count); len -= count; cp += count; off = 0; iol--; iov++; } } void cuio_copyback(struct uio *uio, int off, int len, const void *_cp) { struct iovec *iov = uio->uio_iov; int iol = uio->uio_iovcnt; unsigned count; caddr_t cp = (caddr_t)_cp; 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++; } while (len > 0) { if (iol == 0) panic("uio_copyback: empty"); count = min(iov->iov_len - off, len); bcopy(cp, ((caddr_t)iov->iov_base) + off, count); len -= count; cp += count; off = 0; iol--; iov++; } } int cuio_getptr(struct uio *uio, int loc, int *off) { int ind, len; ind = 0; while (loc >= 0 && ind < uio->uio_iovcnt) { len = uio->uio_iov[ind].iov_len; if (len > loc) { *off = loc; return (ind); } loc -= len; ind++; } if (ind > 0 && loc == 0) { ind--; *off = uio->uio_iov[ind].iov_len; return (ind); } return (-1); } int cuio_apply(struct uio *uio, int off, int len, int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate) { int rval, ind, uiolen; unsigned int count; if (len < 0) panic("cuio_apply: len %d < 0", len); if (off < 0) panic("cuio_apply: off %d < 0", off); ind = 0; while (off > 0) { if (ind >= uio->uio_iovcnt) panic("cuio_apply: ind %d >= uio_iovcnt %d for off", ind, uio->uio_iovcnt); uiolen = uio->uio_iov[ind].iov_len; if (off < uiolen) break; off -= uiolen; ind++; } while (len > 0) { if (ind >= uio->uio_iovcnt) panic("cuio_apply: ind %d >= uio_iovcnt %d for len", ind, uio->uio_iovcnt); count = min(uio->uio_iov[ind].iov_len - off, len); rval = f(fstate, (char *)uio->uio_iov[ind].iov_base + off, count); if (rval) return (rval); len -= count; off = 0; ind++; } return (0); }