bsd/dev/arm/stubs.c

   1 /*
   2  * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
   3  */
   4 /*
   5  * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
   6  * Copyright (c) 1993 NeXT Computer, Inc.
   7  *
   8  */
   9
  10 #include <sys/cdefs.h>
  11 #include <sys/param.h>
  12 #include <sys/systm.h>
  13 #include <sys/ioctl.h>
  14 #include <sys/tty.h>
  15 #include <sys/conf.h>
  16 #include <sys/kauth.h>
  17 #include <sys/ucred.h>
  18 #include <sys/proc_internal.h>
  19 #include <sys/sysproto.h>
  20 #include <sys/user.h>
  21 #include <kern/task.h>
  22 #include <kern/thread.h>
  23 #include <vm/vm_map.h>
  24
  25
  26 /*
  27  * copy a null terminated string from the kernel address space into the user
  28  * address space. - if the user is denied write access, return EFAULT. - if
  29  * the end of string isn't found before maxlen bytes are copied,  return
  30  * ENAMETOOLONG, indicating an incomplete copy. - otherwise, return 0,
  31  * indicating success. the number of bytes copied is always returned in
  32  * lencopied.
  33  */
  34 int
  35 copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t * lencopied)
  36 {
  37         size_t          slen;
  38         size_t          len;
  39         int             error = copyoutstr_prevalidate(from, to, maxlen);
  40
  41         if (__improbable(error)) {
  42                 return error;
  43         }
  44
  45         slen = strlen(from) + 1;
  46         if (slen > maxlen) {
  47                 error = ENAMETOOLONG;
  48         }
  49
  50         len = MIN(maxlen, slen);
  51         if (copyout(from, to, len)) {
  52                 error = EFAULT;
  53         }
  54         *lencopied = len;
  55
  56         return error;
  57 }
  58
  59
  60 /*
  61  * copy a null terminated string from one point to another in the kernel
  62  * address space. - no access checks are performed. - if the end of string
  63  * isn't found before maxlen bytes are copied,  return ENAMETOOLONG,
  64  * indicating an incomplete copy. - otherwise, return 0, indicating success.
  65  * the number of bytes copied is always returned in lencopied.
  66  */
  67 /* from ppc/fault_copy.c -Titan1T4 VERSION  */
  68 int
  69 copystr(const void *vfrom, void *vto, size_t maxlen, size_t * lencopied)
  70 {
  71         size_t          l;
  72         char const     *from = (char const *) vfrom;
  73         char           *to = (char *) vto;
  74
  75         for (l = 0; l < maxlen; l++) {
  76                 if ((*to++ = *from++) == '\0') {
  77                         if (lencopied) {
  78                                 *lencopied = l + 1;
  79                         }
  80                         return 0;
  81                 }
  82         }
  83         if (lencopied) {
  84                 *lencopied = maxlen;
  85         }
  86         return ENAMETOOLONG;
  87 }
  88
  89 int
  90 copywithin(void *src, void *dst, size_t count)
  91 {
  92         bcopy(src, dst, count);
  93         return 0;
  94 }
  95