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/user.h>
  20 #include <kern/task.h>
  21 #include <kern/thread.h>
  22 #include <vm/vm_map.h>
  23
  24 /*
  25  * copy a null terminated string from the kernel address space into the user
  26  * address space. - if the user is denied write access, return EFAULT. - if
  27  * the end of string isn't found before maxlen bytes are copied,  return
  28  * ENAMETOOLONG, indicating an incomplete copy. - otherwise, return 0,
  29  * indicating success. the number of bytes copied is always returned in
  30  * lencopied.
  31  */
  32 int
  33 copyoutstr(const void *from, user_addr_t to, size_t maxlen, size_t * lencopied)
  34 {
  35         size_t          slen;
  36         size_t          len;
  37         int             error = copyoutstr_prevalidate(from, to, maxlen);
  38
  39         if (__improbable(error)) {
  40                 return error;
  41         }
  42
  43         slen = strlen(from) + 1;
  44         if (slen > maxlen) {
  45                 error = ENAMETOOLONG;
  46         }
  47
  48         len = min(maxlen, slen);
  49         if (copyout(from, to, len)) {
  50                 error = EFAULT;
  51         }
  52         *lencopied = len;
  53
  54         return error;
  55 }
  56
  57
  58 /*
  59  * copy a null terminated string from one point to another in the kernel
  60  * address space. - no access checks are performed. - if the end of string
  61  * isn't found before maxlen bytes are copied,  return ENAMETOOLONG,
  62  * indicating an incomplete copy. - otherwise, return 0, indicating success.
  63  * the number of bytes copied is always returned in lencopied.
  64  */
  65 /* from ppc/fault_copy.c -Titan1T4 VERSION  */
  66 int
  67 copystr(const void *vfrom, void *vto, size_t maxlen, size_t * lencopied)
  68 {
  69         size_t          l;
  70         char const     *from = (char const *) vfrom;
  71         char           *to = (char *) vto;
  72
  73         for (l = 0; l < maxlen; l++) {
  74                 if ((*to++ = *from++) == '\0') {
  75                         if (lencopied) {
  76                                 *lencopied = l + 1;
  77                         }
  78                         return 0;
  79                 }
  80         }
  81         if (lencopied) {
  82                 *lencopied = maxlen;
  83         }
  84         return ENAMETOOLONG;
  85 }
  86
  87 int
  88 copywithin(void *src, void *dst, size_t count)
  89 {
  90         bcopy(src, dst, count);
  91         return 0;
  92 }