git.saurik.com Git - apple/xnu.git/blame_incremental

... / ...

Commit	Line	Data
	1	/*
	2	* Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*
	29	* Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
	30	* Copyright (c) 1993 NeXT Computer, Inc.
	31	*
	32	*/
	33
	34	#include <sys/param.h>
	35	#include <sys/systm.h>
	36	#include <sys/ioctl.h>
	37	#include <sys/tty.h>
	38	#include <sys/conf.h>
	39	#include <sys/kauth.h>
	40	#include <sys/ucred.h>
	41	#include <sys/proc_internal.h>
	42	#include <sys/user.h>
	43	#include <kern/task.h>
	44	#include <kern/thread.h>
	45	#include <vm/vm_map.h>
	46	#include <machine/machine_routines.h>
	47
	48	/*
	49	* copy a null terminated string from the kernel address space into
	50	* the user address space.
	51	* - if the user is denied write access, return EFAULT.
	52	* - if the end of string isn't found before
	53	* maxlen bytes are copied, return ENAMETOOLONG,
	54	* indicating an incomplete copy.
	55	* - otherwise, return 0, indicating success.
	56	* the number of bytes copied is always returned in lencopied.
	57	*/
	58	int
	59	copyoutstr(const void from, user_addr_t to, size_t maxlen, size_t lencopied)
	60	{
	61	size_t slen;
	62	size_t len;
	63	int error = 0;
	64
	65	slen = strlen(from) + 1;
	66	if (slen > maxlen) {
	67	error = ENAMETOOLONG;
	68	}
	69
	70	len = min(maxlen, slen);
	71	if (copyout(from, to, len)) {
	72	error = EFAULT;
	73	}
	74	*lencopied = len;
	75
	76	return error;
	77	}
	78
	79
	80	/*
	81	* copy a null terminated string from one point to another in
	82	* the kernel address space.
	83	* - no access checks are performed.
	84	* - if the end of string isn't found before
	85	* maxlen bytes are copied, return ENAMETOOLONG,
	86	* indicating an incomplete copy.
	87	* - otherwise, return 0, indicating success.
	88	* the number of bytes copied is always returned in lencopied.
	89	*/
	90	/* from ppc/fault_copy.c -Titan1T4 VERSION */
	91	int
	92	copystr(const void vfrom, void vto, size_t maxlen, size_t *lencopied)
	93	{
	94	size_t l;
	95	char const from = (char const ) vfrom;
	96	char to = (char ) vto;
	97
	98	for (l = 0; l < maxlen; l++) {
	99	if ((to++ = from++) == '\0') {
	100	if (lencopied) {
	101	*lencopied = l + 1;
	102	}
	103	return 0;
	104	}
	105	}
	106	if (lencopied) {
	107	*lencopied = maxlen;
	108	}
	109	return ENAMETOOLONG;
	110	}
	111
	112	int
	113	copywithin(void src, void dst, size_t count)
	114	{
	115	bcopy(src, dst, count);
	116	return 0;
	117	}