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120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
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* Copyright (c) 2002 Somebody. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_param.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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/*
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* Miscellaneous mbuf routines that belong in uipc_mbuf.c but
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* are kept private to the crypto support for now.
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*/
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extern int m_apply(struct mbuf *m, int off, int len,
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int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate);
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extern struct mbuf * m_getptr(struct mbuf *m, int loc, int *off);
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/*
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* Apply function f to the data in an mbuf chain starting "off" bytes from the
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* beginning, continuing for "len" bytes.
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*/
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int
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m_apply(struct mbuf *m, int off, int len, int (*f)(caddr_t, caddr_t, unsigned int), caddr_t fstate)
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{
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int rval;
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unsigned int count;
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if (len < 0)
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panic("m_apply: len %d < 0", len);
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if (off < 0)
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panic("m_apply: off %d < 0", off);
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while (off > 0) {
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if (m == NULL)
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panic("m_apply: null mbuf in skip");
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if (off < m->m_len)
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break;
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off -= m->m_len;
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m = m->m_next;
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}
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while (len > 0) {
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if (m == NULL)
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panic("m_apply: null mbuf");
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count = min(m->m_len - off, len);
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rval = f(fstate, mtod(m, caddr_t) + 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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m = m->m_next;
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}
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return (0);
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}
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/*
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* Return a pointer to mbuf/offset of location in mbuf chain.
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*/
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struct mbuf *
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m_getptr(struct mbuf *m, int loc, int *off)
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{
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while (loc >= 0) {
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/* Normal end of search */
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if (m->m_len > loc) {
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*off = loc;
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return (m);
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}
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else {
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loc -= m->m_len;
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if (m->m_next == NULL) {
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if (loc == 0) {
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/* Point at the end of valid data */
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*off = m->m_len;
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return (m);
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}
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else
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return (NULL);
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}
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else
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m = m->m_next;
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}
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}
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return (NULL);
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}
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