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FreeBSD/Linux Kernel Cross Reference
sys/kern/cnmagic.c

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    1 /*      $NetBSD: cnmagic.c,v 1.9.64.1 2010/02/14 13:35:43 bouyer Exp $  */
    2 
    3 /*
    4  * Copyright (c) 2000 Eduardo Horvath
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *      This product includes software developed by Eduardo Horvath.
   18  * 4. The name of the author may not be used to endorse or promote products
   19  *    derived from this software without specific prior written permission
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __KERNEL_RCSID(0, "$NetBSD: cnmagic.c,v 1.9.64.1 2010/02/14 13:35:43 bouyer Exp $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/kernel.h>
   39 
   40 #define ENCODE_STATE(c, n) (short)(((c)&0x1ff)|(((n)&0x7f)<<9))
   41 
   42 static unsigned short cn_magic[CNS_LEN];
   43 
   44 /*
   45  * Initialize a cnm_state_t.
   46  */
   47 void
   48 cn_init_magic(cnm_state_t *cnm)
   49 {
   50         cnm->cnm_state = 0;
   51         cnm->cnm_magic = cn_magic;
   52 }
   53 
   54 /*
   55  * Destroy a cnm_state_t.
   56  */
   57 void
   58 cn_destroy_magic(cnm_state_t *cnm)
   59 {
   60         cnm->cnm_state = 0;
   61         cnm->cnm_magic = NULL;
   62 }
   63 
   64 /*
   65  * Translate a magic string to a state
   66  * machine table.
   67  */
   68 int
   69 cn_set_magic(const char *magic)
   70 {
   71         unsigned int i, c, n;
   72         unsigned short m[CNS_LEN];
   73 
   74         for (i = 0; i < CNS_LEN; i++) {
   75                 c = (*magic++) & 0xff;
   76                 n = *magic ? i+1 : CNS_TERM;
   77                 switch (c) {
   78                 case 0:
   79                         /* End of string */
   80                         if (i == 0) {
   81                                 /* empty string? */
   82                                 cn_magic[0] = 0;
   83 #ifdef DEBUG
   84                                 printf("cn_set_magic(): empty!\n");
   85 #endif
   86                                 return (0);
   87                         }
   88                         do {
   89                                 cn_magic[i] = m[i];
   90                         } while (i--);
   91                         return(0);
   92                 case 0x27:
   93                         /* Escape sequence */
   94                         c = (*magic++) & 0xff;
   95                         n = *magic ? i+1 : CNS_TERM;
   96                         switch (c) {
   97                         case 0x27:
   98                                 break;
   99                         case 0x01:
  100                                 /* BREAK */
  101                                 c = CNC_BREAK;
  102                                 break;
  103                         case 0x02:
  104                                 /* NUL */
  105                                 c = 0;
  106                                 break;
  107                         }
  108                         /* FALLTHROUGH */
  109                 default:
  110                         /* Transition to the next state. */
  111 #ifdef DEBUG
  112                         if (!cold)
  113                                 aprint_normal("mag %d %x:%x\n", i, c, n);
  114 #endif
  115                         m[i] = ENCODE_STATE(c, n);
  116                         break;
  117                 }
  118         }
  119         return (EINVAL);
  120 }
  121 
  122 /*
  123  * Translatea state machine table back to
  124  * a magic string.
  125  */
  126 int
  127 cn_get_magic(char *magic, size_t maglen)
  128 {
  129         size_t i, c;
  130 
  131         for (i = 0; i < CNS_LEN;) {
  132                 c = cn_magic[i];
  133                 /* Translate a character */
  134                 switch (CNS_MAGIC_VAL(c)) {
  135                 case CNC_BREAK:
  136                         *magic++ = 0x27;
  137                         *magic++ = 0x01;
  138                         break;
  139                 case 0:
  140                         *magic++ = 0x27;
  141                         *magic++ = 0x02;
  142                         break;
  143                 case 0x27:
  144                         *magic++ = 0x27;
  145                         *magic++ = 0x27;
  146                         break;
  147                 default:
  148                         *magic++ = (c & 0x0ff);
  149                         break;
  150                 }
  151                 /* Now go to the next state */
  152                 i = CNS_MAGIC_NEXT(c);
  153                 if (i == CNS_TERM || i == 0) {
  154                         /* Either termination state or empty machine */
  155                         *magic++ = 0;
  156                         return (0);
  157                 }
  158         }
  159         return (EINVAL);
  160 }
  161 

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