The Drunken Bishop

Dyalog APL (178)

{⎕ML←3⋄F←9 17⍴0⋄5 9{(⍺⌷F)+←1⋄×⍴⍵:(1 1⌈9 17⌊⍺-1 1-2×↑⍵)∇1↓⍵⋄(⍺⌷F)←16⋄F[5;9]←15⋄K⍪(M,' .o+=*BOX@%&#/^SE'[1+F],M←'|')⍪K←'+','+',⍨17⍴'-'}⊃,/{↓⊖4 2⍴⍉(4/2)⊤¯1+⍵⍳⍨⎕D,'abcdef'}¨⍵⊂⍨':'≠⍵}

This is a function that takes the string as its right argument, and returns a character matrix containing the ASCII art representation, e.g.:

      F←{⎕ML←3⋄F←9 17⍴0⋄5 9{(⍺⌷F)+←1⋄×⍴⍵:(1 1⌈9 17⌊⍺-1 1-2×↑⍵)∇1↓⍵⋄(⍺⌷F)←16⋄F[5;9]←15⋄K⍪(M,' .o+=*BOX@%&#/^SE'[1+F],M←'|')⍪K←'+','+',⍨17⍴'-'}⊃,/{↓⊖4 2⍴⍉(4/2)⊤¯1+⍵⍳⍨⎕D,'abcdef'}¨⍵⊂⍨':'≠⍵}


      F '16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48'
+-----------------+
|        .        |
|       + .       |
|      . B .      |
|     o * +       |
|    X * S        |
|   + O o . .     |
|    .   E . o    |
|       . . o     |
|        . .      |
+-----------------+
      F 'b6:dd:b7:1f:bc:25:31:d3:12:f4:92:1c:0b:93:5f:4b'
+-----------------+
|            o.o  |
|            .= E.|
|             .B.o|
|              .= |
|        S     = .|
|       . o .  .= |
|        . . . oo.|
|             . o+|
|              .o.|
+-----------------+

Explanation:

• ⎕ML←3: set ⎕ML to 3. This makes ⊂ more useful for splitting strings.

• F←9 17⍴0: make a 17-by-9 matrix of zeroes. F represents how many times each position has been visited.

• ⍵⊂⍨':'≠⍵: split ⍵ on : characters.

• {...}¨: for each group:
  • ¯1+⍵⍳⍨⎕D,'abcdef': find the index of each character in the string '01234567890abcdef'. Subtract 1, because APL is 1-indexed by default.
  • (4/2)⊤: convert the values to their 4-bit representations (there should now be 2-by-4 matrix).
  • ↓⊖4 2⍴⍉: rotate the matrix, use the elements to fill a 2-by-4 matrix instead, mirror that matrix horizontally, and then get each line separately. This gives us the 4 2-bit values we need.
• ⊃,/: join the resulting lists together, giving a list of 2-bit steps.
• 5 9{...}: given the list of steps, and starting at position [9,5]:
  • (⍺⌷F)+←1: increment the current position in F.
  • ×⍴⍵:: if the list of steps is not empty:
    • ↑⍵: take the first step from the list
    • ⍺-1 1-2×: get the delta for that step, and subtract it from the current position
    • 1 1⌈9 17⌊: restrict movement to within the field
    • (...)∇1↓⍵: continue with the new position and the rest of the steps
  • If it is empty:
    • (⍺⌷F)←16: set F to 16 at the final position
    • F[5;9]←15: set F to 15 at the start position
    • ' .o+=*BOX@%&#/^SE'[1+F]: map each position to the corresponding character
    • K⍪(M,...,M←'|')⍪K←'+','+',⍨17⍴'-': wrap the result in lines

Perl, 300 + 1 (-n) = 301 bytes

perl -ne 'sub b{$b=$_[0]+$_[1];$_[0]=$b<0?0:$b>$_[2]?$_[2]:$b}$v=pack"(H2)*",/\w\w/g;($x,$y)=(8,4);$a[b($y,($_&2)-1,8)*17+b($x,($_&1)*2-1,16)]++for map{vec$v,$_,2}0..63;@a[76,$y*17+$x]=(15,16);$c=" .o+=*BOX@%&#/^SE";print$d="+".("-"x17)."+\n",(map{+"|",(map{substr$c,$_,1}@a[$_*17..($_+1)*17-1]),"|\n"}0..8),$d'

This answer is disgusting, but it's also the first one for this puzzle, so it'll do for now.

-n to take a line of input on STDIN and fill $_.

# b($v, -1 or 1, max) modifies $v within 0..max
sub b{$b=$_[0]+$_[1];$_[0]=$b<0?0:$b>$_[2]?$_[2]:$b}

# turn $_ into a binary string
$v=pack"(H2)*",/\w\w/g;

# initialize cursor
($x,$y)=(8,4);

# find an element of single-dimensional buffer @a
$a[
    # y += (bitpair & 2) - 1, within 8
    b($y,($_&2)-1,8) * 17
    # x += (bitpair & 1) * 2 - 1, within 17
  + b($x,($_&1)*2-1,16)
# and increment it
]++
# for each bit pair (in the right order!)
  for map{vec$v,$_,2}0..63;

# overwrite the starting and ending positions
@a[76,$y*17+$x]=(15,16);

# ascii art lookup table
$c=" .o+=*BOX@%&#/^SE";

# output
print
  # the top row, saving it for later
  $d="+".("-"x17)."+\n",
  # each of the eight middle rows
  (map{+
    # converting each character in @a in this row as appropriate
    "|",(map{substr$c,$_,1}@a[$_*17..($_+1)*17-1]),"|\n"
  }0..8),
  # the bottom row
  $d

R, 465 459 410 393 382 357 bytes

f=function(a){s=strsplit;C=matrix(as.integer(sapply(strtoi(el(s(a,":")),16),intToBits)[1:8,]),2);C[!C]=-1;n=c(17,9);R=array(0,n);w=c(9,5);for(i in 1:64){w=w+C[,i];w[w<1]=1;w[w>n]=n[w>n];x=w[1];y=w[2];R[x,y]=R[x,y]+1};R[]=el(s(" .o+=*BOX@%&#/^",""))[R+1];R[9,5]="S";R[x,y]="E";z="+-----------------+\n";cat(z);for(i in 1:9)cat("|",R[,i],"|\n",sep="");cat(z)}

With indentations and newlines:

f=function(a){
    s=strsplit
    C=matrix(as.integer(sapply(strtoi(el(s(a,":")),16),intToBits)[1:8,]),2)
    C[!C]=-1
    n=c(17,9)
    R=array(0,n)
    w=c(9,5)
    for(i in 1:64){
        w=w+C[,i]
        w[w<1]=1
        w[w>n]=n[w>n]
        x=w[1]
        y=w[2]
        R[x,y]=R[x,y]+1
    }
    R[]=el(s(" .o+=*BOX@%&#/^",""))[R+1]
    R[9,5]="S"
    R[x,y]="E"
    z="+-----------------+\n"
    cat(z)
    for(i in 1:9)cat("|",R[,i],"|\n",sep="")
    cat(z)
}

Usage:

> f("16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48")
+-----------------+
|        .        |
|       + .       |
|      . B .      |
|     o * +       |
|    X * S        |
|   + O o . .     |
|    .   E . o    |
|       . . o     |
|        . .      |
+-----------------+
> f("37:e4:6a:2d:48:38:1a:0a:f3:72:6d:d9:17:6b:bd:5e")
+-----------------+
|                 |
|                 |
|          .      |
|     .   o       |
|o . o . S +      |
|.+ + = . B .     |
|o + + o B o E    |
| o .   + . o     |
|         .o      |
+-----------------+