96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
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/*
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* Copyright (c) 2000-2007 Apple Inc. All rights reserved.
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*/
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/*
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* Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
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* Copyright (c) 1993 NeXT Computer, Inc.
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*
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/ioctl.h>
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#include <sys/tty.h>
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#include <sys/conf.h>
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#include <sys/kauth.h>
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#include <sys/ucred.h>
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#include <sys/proc_internal.h>
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#include <sys/sysproto.h>
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#include <sys/user.h>
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#include <kern/task.h>
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#include <kern/thread.h>
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#include <vm/vm_map.h>
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/*
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* copy a null terminated string from the kernel address space into the user
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* address space. - if the user is denied write access, return EFAULT. - if
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* the end of string isn't found before maxlen bytes are copied, return
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* ENAMETOOLONG, indicating an incomplete copy. - otherwise, return 0,
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* indicating success. the number of bytes copied is always returned in
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* lencopied.
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*/
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int
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copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t * lencopied)
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{
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size_t slen;
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size_t len;
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int error = copyoutstr_prevalidate(from, to, maxlen);
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if (__improbable(error)) {
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return error;
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}
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slen = strlen(from) + 1;
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if (slen > maxlen) {
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error = ENAMETOOLONG;
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}
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len = MIN(maxlen, slen);
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if (copyout(from, to, len)) {
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error = EFAULT;
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}
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*lencopied = len;
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return error;
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}
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/*
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* copy a null terminated string from one point to another in the kernel
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* address space. - no access checks are performed. - if the end of string
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* isn't found before maxlen bytes are copied, return ENAMETOOLONG,
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* indicating an incomplete copy. - otherwise, return 0, indicating success.
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* the number of bytes copied is always returned in lencopied.
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*/
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/* from ppc/fault_copy.c -Titan1T4 VERSION */
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int
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copystr(const void *vfrom, void *vto, size_t maxlen, size_t * lencopied)
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{
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size_t l;
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char const *from = (char const *) vfrom;
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char *to = (char *) vto;
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for (l = 0; l < maxlen; l++) {
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if ((*to++ = *from++) == '\0') {
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if (lencopied) {
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*lencopied = l + 1;
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}
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return 0;
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}
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}
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if (lencopied) {
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*lencopied = maxlen;
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}
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return ENAMETOOLONG;
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}
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int
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copywithin(void *src, void *dst, size_t count)
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{
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bcopy(src, dst, count);
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return 0;
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}
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