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# write-stream: like write, but write streams rather than strings

== code
#   instruction                     effective address                                                   register    displacement    immediate
# . op          subop               mod             rm32          base        index         scale       r32
# . 1-3 bytes   3 bits              2 bits          3 bits        3 bits      3 bits        2 bits      2 bits      0/1/2/4 bytes   0/1/2/4 bytes

write-stream:  # f: (addr stream byte), s: (addr stream byte)
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    50/push-eax
    56/push-esi
    57/push-edi
    # edi = f
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # esi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
    # eax = _append-4(&f->data[f->write], &f->data[f->size], &s->data[s->read], &s->data[s->write])
    # . . push &s->data[s->write]
    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           0/r32/eax   .               .                 # copy *esi to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/esi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy esi+eax+12 to eax
    50/push-eax
    # . . push &s->data[s->read]
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # copy *(esi+4) to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/esi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy esi+eax+12 to eax
    50/push-eax
    # . . push &f->data[f->size]
    8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           0/r32/eax   8/disp8         .                 # copy *(edi+8) to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/edi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy edi+eax+12 to eax
    50/push-eax
    # . . push &f->data[f->write]
    8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           0/r32/eax   .               .                 # copy *edi to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/edi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy edi+eax+12 to eax
    50/push-eax
    # . . call
    e8/call  _append-4/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
    # f->write += eax
    01/add                          0/mod/indirect  7/rm32/edi    .           .             .           0/r32/eax   .               .                 # add eax to *edi
    # s->read += eax
    01/add                          1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # add eax to *(esi+4)
$write-stream:end:
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    58/pop-to-eax
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

test-write-stream-single:
    # setup
    # . clear-stream(_test-stream)
    # . . push args
    68/push  _test-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . clear-stream(_test-stream2)
    # . . push args
    68/push  _test-stream2/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . write(_test-stream2, "Ab")
    # . . push args
    68/push  "Ab"/imm32
    68/push  _test-stream2/imm32
    # . . call
    e8/call  write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # write-stream(_test-stream, _test-stream2)
    # . . push args
    68/push  _test-stream2/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  write-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-stream-equal(_test-stream, "Ab", msg)
    # . . push args
    68/push  "F - test-write-stream-single"/imm32
    68/push  "Ab"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . end
    c3/return

test-write-stream-appends:
    # setup
    # . clear-stream(_test-stream)
    # . . push args
    68/push  _test-stream/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . clear-stream(_test-stream2)
    # . . push args
    68/push  _test-stream2/imm32
    # . . call
    e8/call  clear-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               4/imm32           # add to esp
    # . write(_test-stream2, "C")
    # . . push args
    68/push  "C"/imm32
    68/push  _test-stream2/imm32
    # . . call
    e8/call  write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # first write
    # . write-stream(_test-stream, _test-stream2)
    # . . push args
    68/push  _test-stream2/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  write-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # second write
    # . write(_test-stream2, "D")
    # . . push args
    68/push  "D"/imm32
    68/push  _test-stream2/imm32
    # . . call
    e8/call  write/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # . write-stream(_test-stream, _test-stream2)
    # . . push args
    68/push  _test-stream2/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  write-stream/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
    # check-stream-equal(_test-stream, "CD", msg)
    # . . push args
    68/push  "F - test-write-stream-appends"/imm32
    68/push  "CD"/imm32
    68/push  _test-stream/imm32
    # . . call
    e8/call  check-stream-equal/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0xc/imm32         # add to esp
    # . end
    c3/return

# like write-stream, but don't update s->read
# is there a better name for this?
write-stream-immutable:  # f: (addr stream byte), s: (addr stream byte)
    # . prologue
    55/push-ebp
    89/copy                         3/mod/direct    5/rm32/ebp    .           .             .           4/r32/esp   .               .                 # copy esp to ebp
    # . save registers
    50/push-eax
    56/push-esi
    57/push-edi
    # edi = f
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         7/r32/edi   8/disp8         .                 # copy *(ebp+8) to edi
    # esi = s
    8b/copy                         1/mod/*+disp8   5/rm32/ebp    .           .                         6/r32/esi   0xc/disp8       .                 # copy *(ebp+12) to esi
    # eax = _append-4(&f->data[f->write], &f->data[f->size], &s->data[s->read], &s->data[s->write])
    # . . push &s->data[s->write]
    8b/copy                         0/mod/indirect  6/rm32/esi    .           .             .           0/r32/eax   .               .                 # copy *esi to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/esi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy esi+eax+12 to eax
    50/push-eax
    # . . push &s->data[s->read]
    8b/copy                         1/mod/*+disp8   6/rm32/esi    .           .             .           0/r32/eax   4/disp8         .                 # copy *(esi+4) to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    6/base/esi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy esi+eax+12 to eax
    50/push-eax
    # . . push &f->data[f->size]
    8b/copy                         1/mod/*+disp8   7/rm32/edi    .           .             .           0/r32/eax   8/disp8         .                 # copy *(edi+8) to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/edi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy edi+eax+12 to eax
    50/push-eax
    # . . push &f->data[f->write]
    8b/copy                         0/mod/indirect  7/rm32/edi    .           .             .           0/r32/eax   .               .                 # copy *edi to eax
    8d/copy-address                 1/mod/*+disp8   4/rm32/sib    7/base/edi  0/index/eax   .           0/r32/eax   0xc/disp8       .                 # copy edi+eax+12 to eax
    50/push-eax
    # . . call
    e8/call  _append-4/disp32
    # . . discard args
    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               0x10/imm32        # add to esp
    # f->write += eax
    01/add                          0/mod/indirect  7/rm32/edi    .           .             .           0/r32/eax   .               .                 # add eax to *edi
$write-stream-immutable:end:
    # . restore registers
    5f/pop-to-edi
    5e/pop-to-esi
    58/pop-to-eax
    # . epilogue
    89/copy                         3/mod/direct    4/rm32/esp    .           .             .           5/r32/ebp   .               .                 # copy ebp to esp
    5d/pop-to-ebp
    c3/return

== data

_test-stream2:  # (stream byte)
    # current write index
    4/imm32
    # current read index
    1/imm32
    # size
    8/imm32
    # data
    41/A 42/B 43/C 44/D 00 00 00 00  # 8 bytes

# . . vim:nowrap:textwidth=0
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-08-04 09:44:30 +0000
ttack :initarg a :reader attack) (health :initarg h :accessor health))) (defmethod print-object ((obj <monster>) stream) (format stream "~A" (name obj))) (defun create-monster (n a h) (make-instance (find-class '<monster>) 'n n 'a a 'h h)) (defconstant +monsters+ (vector (create-monster "blind bat" 2 1) (create-monster "rat" 1 1) (create-monster "snake" 3 1) (create-monster "goblin" 2 3) (create-monster "troll" 4 4) (create-monster "bear" 5 5) (create-monster "lion" 5 4) (create-monster "sabretooth" 6 5) (create-monster "elephant" 7 8) (create-monster "dragon" 9 8))) (defclass <item> () ((name :initarg n :reader name) (class :initarg c :reader class) (value :initarg v :reader value))) (defclass <food> (<item>) ()) (defclass <weapon> (<item>) ()) (defclass <trap> (<item>) ()) (defun create-item (n c v) (make-instance (find-class c) 'n n 'v v)) (defconstant +items+ (vector (create-item "apple " '<food> 1) (create-item "bread " '<food> 2) (create-item "chicken " '<food> 3) (create-item "dagger " '<weapon> 2) (create-item "sword " '<weapon> 3) (create-item "halberd " '<weapon> 4) (create-item "smoke " '<trap> 1) (create-item "noose trap" '<trap> 2) (create-item "pit trap " '<trap> 3))) (defgeneric copy (obj)) (defmethod copy ((obj <monster>)) (create-monster (name obj) (attack obj) (health obj))) (defvar *curr-monster*) (defvar *monster-gold*) (defvar *curr-item*) (defun my-print (x) (format *standard-output* "~A~%" x)) (defun print-help () (cursor 14 1) (my-print "Commands: n - north") (my-print " s - south") (my-print " e - east") (my-print " w - west") (my-print " a - attack") (my-print " t - take item") (my-print " x - use exit") (write-char #\newline) (my-print " q - quit") (cursor 14 40) (format *standard-output* "+~A+~%" (make-string 10 :initial-element #\-)) (cursor 15 40) (format *standard-output* "|~A|~%" (make-string 10 :initial-element #\space)) (cursor 16 40) (format *standard-output* "+~A+~%" (make-string 10 :initial-element #\-)) (cursor 17 44) (my-print "ITEM")) (defgeneric move (coord dir)) (defmethod move ((coord <coord>) dir) (case dir ((n) (if (= (row coord) 1) (my-print +move-err+) (progn (setf (row coord) (- (row coord) 1)) (my-print "You go north.")))) ((s) (if (= (row coord) 10) (my-print +move-err+) (progn (setf (row coord) (+ (row coord) 1)) (my-print "You go south.")))) ((w) (if (= (col coord) 1) (my-print +move-err+) (progn (setf (col coord) (- (col coord) 1)) (my-print "You go west.")))) ((e) (if (= (col coord) 10) (my-print +move-err+) (progn (setf (col coord) (+ (col coord) 1)) (my-print "You go east.")))) (t (error "bad dir")))) (defgeneric coord= (l r)) (defmethod coord= ((l <coord>) (r <coord>)) (and (= (row l) (row r)) (= (col l) (col r)))) (defun attack-cmd () (if (null *curr-monster*) (my-print "There's nothing to attack!") (progn (loop while (and (> (health *curr-monster*) 0) (> (health *the-player*) 0)) do (cursor 10 1) (clrtoeol) (cursor 11 1) (clrtoeol) (cursor 12 1) (clrtoeol) (cursor 10 1) (let ((attack (+ (weapon *the-player*) (random 9))) (monster-attack (attack *curr-monster*))) (cond ((= attack monster-attack) (my-print "No one wins this round.")) ((> attack monster-attack) (format *standard-output* "You deal the ~A a blow!~%" (name *curr-monster*)) (setf (health *curr-monster*) (- (health *curr-monster*) 1))) ((< attack monster-attack) (my-print "You have been wounded!") (setf (health *the-player*) (- (health *the-player*) 1)))) (my-print +press-key+) (read-line))) (cursor 10 1) (clrtoeol) (if (> (health *the-player*) 0) (progn (clrtoeol) (my-print "You won the fight!") (format *standard-output* "You found ~A pieces of gold!~%" *monster-gold*) (setf (gold *the-player*) (+ (gold *the-player*) *monster-gold*)) (setq *curr-monster* nil) (setf (monster (aref *map* (row *curr-coord*) (col *curr-coord*))) nil) (my-print +press-key+) (read-line)) (progn (format *standard-output* "The ~A killed you!~%" (name *curr-monster*)) (my-print "Game over!") (throw 'quit nil)))))) (defun take() (if (null *curr-item*) (progn (cursor 10 1) (my-print "Nothing to take!") (my-print +press-key+) (read-line)) (progn (case (class-of *curr-item*) ((find-class '<food>) (cursor 10 1) (format *standard-output* "You eat the ~A.~%" (name *curr-item*)) (if (>= (health *the-player*) 20) (my-print "You had no wounds, so the food is wasted.~%") (progn (setf (health *the-player*) (+ (health *the-player*) (value *curr-item*))) (format *standard-output* "You gain ~A health points ~%" (value *curr-item*))))) ((find-class '<weapon>) (cursor 10 1) (if (>= (weapon *the-player*) (value *curr-item*)) (my-print "You have a similar or better weapon.") (progn (format *standard-output* "You pick up a ~A!") (setf (weapon *the-player*) (value *curr-item*)) (format *standard-output* "Your weapon rating is now ~A.~%" (weapon *the-player)))))) (my-print +press-key+) (read-line) (setf (item (aref *map* (row *curr-coord*) (col *curr-coord))) nil)))) (defun handle-cmd (cmd) (cond ((string= cmd "n") (move *curr-coord* 'n)) ((string= cmd "s") (move *curr-coord* 's)) ((string= cmd "w") (move *curr-coord* 'w)) ((string= cmd "e") (move *curr-coord* 'e)) ((string= cmd "x") (if (coord= *curr-coord* +exit+) (if (< (gold *the-player*) 100) (my-print "You dont have enough gold!") (my-print "You have escaped! Well done!")))) ((string= cmd "a") (attack-cmd)) ((string= cmd "t") (take)) ((string= cmd "q") (my-print "Bye!") (throw 'quit nil)))) (defun get-next-cmd () (cursor 8 1) (my-print "What now") (let ((reply (read-line))) (cursor 10 1) (clrtoeol) reply)) (defun main-loop () (loop (cursor 1 1) (format *standard-output* "Your position: ~A~%" *curr-coord*) (cursor 1 25) (format *standard-output* "~A~%" *the-player*) (cursor 2 1) (if (coord= *curr-coord* +exit+) (my-print "You are at the exit!") (clrtoeol)) (cursor 3 1) (clrtoeol) (let ((monster-type (monster (aref *map* (row *curr-coord*) (col *curr-coord*))))) (if (null monster-type) (progn (setq *curr-monster* nil) (format *standard-output* "Monster: nothing~%") (setq *monster-gold* 0)) (progn (setq *curr-monster* (copy (elt +monsters+ monster-type))) (format *standard-output* "Monster: ~A~%" *curr-monster*) (setq *monster-gold* (* monster-type (random 6)))))) (let ((item-type (item (aref *map* (row *curr-coord*) (col *curr-coord*))))) (if (null item-type) (progn (cursor 15 41) (my-print "nothing ")) (progn (setq *curr-item* (elt +items+ item-type)) (cursor 15 41) (my-print (name *curr-item*)) (if (eq (class-of *curr-item*) (find-class '<trap>)) (progn (cursor 10 1) (format *standard-output* "The ~A damages you for ~A points!~%" (name *curr-item*) (value *curr-item*)) (setf (health *the-player*) (- (health *the-player*) (value *curr-item*))) (setf (item (aref *map* (row *curr-coord*) (col *curr-coord*))) nil) (if (<= (health *the-player*) 0) (progn (my-print "You die!") (my-print "Game over!") (throw 'quit nil)))))))) (handle-cmd (get-next-cmd)))) (defun init () (page) (setq *random-state* (make-random-state t)) (do ((row 1 (+ row 1))) ((>= row 10)) (do ((col 1 (+ col 1))) ((>= col 10)) (setf (aref *map* row col) (make-instance (find-class '<location>))) (let ((rnd (random 11))) (if (/= rnd 0) (setf (monster (aref *map* row col)) (- rnd 1)))) (if (< (random 1.0) 0.2) (setf (item (aref *map* row col)) (random 9)))))) (defun main () (init) (print-help) (catch 'quit (main-loop))) (provide "crpg") (crpg:main)
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-08-04 09:44:26 +0000