Logo Search packages:      
Sourcecode: scummvm version File versions  Download package

op_test.cpp

/* ScummVM - Scumm Interpreter
 * Copyright (C) 2006 The ScummVM project
 *
 * Copyright (C) 1999-2003 Sarien Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL: https://svn.sourceforge.net/svnroot/scummvm/scummvm/tags/release-0-9-1/engines/agi/op_test.cpp $
 * $Id: op_test.cpp 22618 2006-05-24 21:40:24Z aquadran $
 *
 */

#include "common/stdafx.h"

#include "agi/agi.h"
#include "agi/keyboard.h"
#include "agi/opcodes.h"

namespace Agi {

static uint8 test_obj_right(uint8, uint8, uint8, uint8, uint8);
static uint8 test_obj_centre(uint8, uint8, uint8, uint8, uint8);
static uint8 test_obj_in_box(uint8, uint8, uint8, uint8, uint8);
static uint8 test_posn(uint8, uint8, uint8, uint8, uint8);
static uint8 test_said(uint8, uint8 *);
static uint8 test_controller(uint8);
static uint8 test_keypressed(void);
static uint8 test_compare_strings(uint8, uint8);

#define ip (game.logics[lognum].cIP)
#define code (game.logics[lognum].data)

#define test_equal(v1,v2)     (getvar(v1) == (v2))
#define test_less(v1,v2)      (getvar(v1) < (v2))
#define test_greater(v1,v2)   (getvar(v1) > (v2))
#define test_isset(flag)      (getflag (flag))
#define test_has(obj)         (object_get_location (obj) == EGO_OWNED)
#define test_obj_in_room(obj,v)     (object_get_location (obj) == getvar (v))

extern int timer_hack;        /* For the timer loop in MH1 logic 153 */

static uint8 test_compare_strings(uint8 s1, uint8 s2) {
      char ms1[MAX_STRINGLEN];
      char ms2[MAX_STRINGLEN];
      int j, k, l;

      strcpy(ms1, game.strings[s1]);
      strcpy(ms2, game.strings[s2]);

      l = strlen(ms1);
      for (k = 0, j = 0; k < l; k++) {
            switch (ms1[k]) {
            case 0x20:
            case 0x09:
            case '-':
            case '.':
            case ',':
            case ':':
            case ';':
            case '!':
            case '\'':
                  break;

            default:
                  ms1[j++] = toupper(ms1[k]);
                  break;
            }
      }
      ms1[j] = 0x0;

      l = strlen(ms2);
      for (k = 0, j = 0; k < l; k++) {
            switch (ms2[k]) {
            case 0x20:
            case 0x09:
            case '-':
            case '.':
            case ',':
            case ':':
            case ';':
            case '!':
            case '\'':
                  break;

            default:
                  ms2[j++] = toupper(ms2[k]);
                  break;
            }
      }
      ms2[j] = 0x0;

      return !strcmp(ms1, ms2);
}

static uint8 test_keypressed() {
      int x = game.keypress;

      game.keypress = 0;
      if (!x) {
            int mode = game.input_mode;
            game.input_mode = INPUT_NONE;
            main_cycle();
            game.input_mode = mode;
      }

      if (x)
            debugC(5, kDebugLevelScripts | kDebugLevelInput, "keypress = %02x", x);

      return x;
}

static uint8 test_controller(uint8 cont) {
      return game.ev_keyp[cont].occured;
}

static uint8 test_posn(uint8 n, uint8 x1, uint8 y1, uint8 x2, uint8 y2) {
      struct vt_entry *v = &game.view_table[n];
      uint8 r;

      r = v->x_pos >= x1 && v->y_pos >= y1 && v->x_pos <= x2 && v->y_pos <= y2;

      debugC(7, kDebugLevelScripts, "(%d,%d) in (%d,%d,%d,%d): %s", v->x_pos, v->y_pos, x1, y1, x2, y2, r ? "true" : "false");

      return r;
}

static uint8 test_obj_in_box(uint8 n, uint8 x1, uint8 y1, uint8 x2, uint8 y2) {
      struct vt_entry *v = &game.view_table[n];

      return v->x_pos >= x1 &&
          v->y_pos >= y1 && v->x_pos + v->x_size - 1 <= x2 && v->y_pos <= y2;
}

/* if n is in centre of box */
static uint8 test_obj_centre(uint8 n, uint8 x1, uint8 y1, uint8 x2, uint8 y2) {
      struct vt_entry *v = &game.view_table[n];

      return v->x_pos + v->x_size / 2 >= x1 &&
                  v->x_pos + v->x_size / 2 <= x2 && v->y_pos >= y1 && v->y_pos <= y2;
}

/* if nect N is in right corner */
static uint8 test_obj_right(uint8 n, uint8 x1, uint8 y1, uint8 x2, uint8 y2) {
      struct vt_entry *v = &game.view_table[n];

      return v->x_pos + v->x_size - 1 >= x1 &&
                  v->x_pos + v->x_size - 1 <= x2 && v->y_pos >= y1 && v->y_pos <= y2;
}

/* When player has entered something, it is parsed elsewhere */
static uint8 test_said(uint8 nwords, uint8 *cc) {
      int c, n = game.num_ego_words;
      int z = 0;

      if (getflag(F_said_accepted_input) || !getflag(F_entered_cli))
            return false;

      /* FR:
       * I think the reason for the code below is to add some speed....
       *
       *      if (nwords != num_ego_words)
       *              return false;
       *
       * In the disco scene in Larry 1 when you type "examine blonde", 
       * inside the logic is expected ( said("examine", "blonde", "rol") )
       * where word("rol") = 9999
       *
       * According to the interpreter code 9999 means that whatever the
       * user typed should be correct, but it looks like code 9999 means that
       * if the string is empty at this point, the entry is also correct...
       * 
       * With the removal of this code, the behaviour of the scene was
       * corrected
       */

      for (c = 0; nwords && n; c++, nwords--, n--) {
            z = READ_LE_UINT16(cc);
            cc += 2;

            switch (z) {
            case 9999:  /* rest of line (empty string counts to...) */
                  nwords = 1;
                  break;
            case 1:     /* any word */
                  break;
            default:
                  if (game.ego_words[c].id != z)
                        return false;
                  break;
            }
      }

      /* The entry string should be entirely parsed, or last word = 9999 */
      if (n && z != 9999)
            return false;

      /* The interpreter string shouldn't be entirely parsed, but next
       * word must be 9999.
       */
      if (nwords != 0 && READ_LE_UINT16(cc) != 9999)
            return false;

      setflag(F_said_accepted_input, true);

      return true;
}

int test_if_code(int lognum) {
      int ec = true;
      int retval = true;
      uint8 op = 0;
      uint8 not_test = false;
      uint8 or_test = false;
      uint16 last_ip = ip;
      uint8 p[16] = { 0 };

      while (retval && !game.quit_prog_now) {
            if (debug_.enabled && (debug_.logic0 || lognum))
                  debug_console(lognum, lTEST_MODE, NULL);

            last_ip = ip;
            op = *(code + ip++);
            memmove(p, (code + ip), 16);

            switch (op) {
            case 0xFF:  /* END IF, TEST true */
                  goto end_test;
            case 0xFD:
                  not_test = !not_test;
                  continue;
            case 0xFC:  /* OR */
                  /* if or_test is ON and we hit 0xFC, end of OR, then
                   * or is STILL false so break.
                   */
                  if (or_test) {
                        ec = false;
                        retval = false;
                        goto end_test;
                  }

                  or_test = true;
                  continue;

            case 0x00:
                  /* return true? */
                  goto end_test;
            case 0x01:
                  ec = test_equal(p[0], p[1]);
                  if (p[0] == 11)
                        timer_hack++;
                  break;
            case 0x02:
                  ec = test_equal(p[0], getvar(p[1]));
                  if (p[0] == 11 || p[1] == 11)
                        timer_hack++;
                  break;
            case 0x03:
                  ec = test_less(p[0], p[1]);
                  if (p[0] == 11)
                        timer_hack++;
                  break;
            case 0x04:
                  ec = test_less(p[0], getvar(p[1]));
                  if (p[0] == 11 || p[1] == 11)
                        timer_hack++;
                  break;
            case 0x05:
                  ec = test_greater(p[0], p[1]);
                  if (p[0] == 11)
                        timer_hack++;
                  break;
            case 0x06:
                  ec = test_greater(p[0], getvar(p[1]));
                  if (p[0] == 11 || p[1] == 11)
                        timer_hack++;
                  break;
            case 0x07:
                  ec = test_isset(p[0]);
                  break;
            case 0x08:
                  ec = test_isset(getvar(p[0]));
                  break;
            case 0x09:
                  ec = test_has(p[0]);
                  break;
            case 0x0A:
                  ec = test_obj_in_room(p[0], p[1]);
                  break;
            case 0x0B:
                  ec = test_posn(p[0], p[1], p[2], p[3], p[4]);
                  break;
            case 0x0C:
                  ec = test_controller(p[0]);
                  break;
            case 0x0D:
                  ec = test_keypressed();
                  break;
            case 0x0E:
                  ec = test_said(p[0], (uint8 *) code + (ip + 1));
                  ip = last_ip;
                  ip++; /* skip opcode */
                  ip += p[0] * 2;   /* skip num_words * 2 */
                  ip++; /* skip num_words opcode */
                  break;
            case 0x0F:
                  debugC(7, kDebugLevelScripts, "comparing [%s], [%s]", game.strings[p[0]], game.strings[p[1]]);
                  ec = test_compare_strings(p[0], p[1]);
                  break;
            case 0x10:
                  ec = test_obj_in_box(p[0], p[1], p[2], p[3], p[4]);
                  break;
            case 0x11:
                  ec = test_obj_centre(p[0], p[1], p[2], p[3], p[4]);
                  break;
            case 0x12:
                  ec = test_obj_right(p[0], p[1], p[2], p[3], p[4]);
                  break;
            default:
                  ec = false;
                  goto end_test;
            }

            if (op <= 0x12)
                  ip += logic_names_test[op].num_args;

            /* exchange ec value */
            if (not_test)
                  ec = !ec;

            /* not is only enabled for 1 test command */
            not_test = false;

            if (or_test && ec) {
                  /* a true inside an OR statement passes
                   * ENTIRE statement scan for end of OR
                   */

                  /* CM: test for opcode < 0xfc changed from 'op' to
                   *     '*(code+ip)', to avoid problem with the 0xfd (NOT)
                   *     opcode byte. Changed a bad ip += ... ip++ construct.
                   *     This should fix the crash with Larry's logic.0 code:
                   *
                   *     if ((isset(4) ||
                   *          !isset(2) ||
                   *          v30 == 2 ||
                   *          v30 == 1)) {
                   *       goto Label1;
                   *     }
                   *
                   *     The bytecode is: 
                   *     ff fc 07 04 fd 07 02 01 1e 02 01 1e 01 fc ff
                   */

                  /* find end of OR */
                  while (*(code + ip) != 0xFC) {
                        if (*(code + ip) == 0x0E) {   /* said */
                              ip++;
                              /* cover count + ^words */
                              ip += 1 + ((*(code + ip)) * 2);
                              continue;
                        }

                        if (*(code + ip) < 0xFC)
                              ip += logic_names_test[*(code + ip)].num_args;
                        ip++;
                  }
                  ip++;

                  or_test = false;
                  retval = true;
            } else {
                  retval = or_test ? retval || ec : retval && ec;
            }
      }
      end_test:

      /* if false, scan for end of IP? */
      if (retval)
            ip += 2;
      else {
            ip = last_ip;
            while (*(code + ip) != 0xff) {
                  if (*(code + ip) == 0x0e) {
                        ip++;
                        ip += (*(code + ip)) * 2 + 1;
                  } else if (*(code + ip) < 0xfc) {
                        ip += logic_names_test[*(code + ip)].num_args;
                        ip++;
                  } else {
                        ip++;
                  }
            }
            ip++;       /* skip over 0xFF */
            ip += READ_LE_UINT16(code + ip) + 2;
      }

      if (debug_.enabled && (debug_.logic0 || lognum))
            debug_console(lognum, 0xFF, retval ? "=true" : "=false");

      return retval;
}

}                             // End of namespace Agi

Generated by  Doxygen 1.6.0   Back to index