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