# newgrf_text.cpp

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    00001 /* $Id: newgrf_text.cpp 15718 2009-03-15 00:32:18Z rubidium $ */
    00002
    00012 #include "stdafx.h"
    00013 #include "newgrf.h"
    00014 #include "strings_func.h"
    00015 #include "newgrf_storage.h"
    00016 #include "string_func.h"
    00017 #include "date_type.h"
    00018
    00019 #include "table/strings.h"
    00020 #include "table/control_codes.h"
    00021
    00022 #define GRFTAB  28
    00023 #define TABSIZE 11
    00024
    00030 enum GRFBaseLanguages {
    00031   GRFLB_AMERICAN    = 0x01,
    00032   GRFLB_ENGLISH     = 0x02,
    00033   GRFLB_GERMAN      = 0x04,
    00034   GRFLB_FRENCH      = 0x08,
    00035   GRFLB_SPANISH     = 0x10,
    00036   GRFLB_GENERIC     = 0x80,
    00037 };
    00038
    00039 enum GRFExtendedLanguages {
    00040   GRFLX_AMERICAN    = 0x00,
    00041   GRFLX_ENGLISH     = 0x01,
    00042   GRFLX_GERMAN      = 0x02,
    00043   GRFLX_FRENCH      = 0x03,
    00044   GRFLX_SPANISH     = 0x04,
    00045   GRFLX_UNSPECIFIED = 0x7F,
    00046 };
    00047
    00053 struct GRFText {
    00054   public:
    00055     static GRFText* New(byte langid, const char* text)
    00056     {
    00057       return new(strlen(text) + 1) GRFText(langid, text);
    00058     }
    00059
    00060   private:
    00061     GRFText(byte langid_, const char* text_) : next(NULL), langid(langid_)
    00062     {
    00063       strcpy(text, text_);
    00064     }
    00065
    00066     void *operator new(size_t size, size_t extra)
    00067     {
    00068       return ::operator new(size + extra);
    00069     }
    00070
    00071 public:
    00072     /* dummy operator delete to silence VC8:
    00073      * 'void *GRFText::operator new(size_t,size_t)' : no matching operator delete found;
    00074      *     memory will not be freed if initialization throws an exception */
    00075     void operator delete(void *p, size_t extra)
    00076     {
    00077       return ::operator delete(p);
    00078     }
    00079
    00080   public:
    00081     GRFText *next;
    00082     byte langid;
    00083     char text[VARARRAY_SIZE];
    00084 };
    00085
    00086
    00092 struct GRFTextEntry {
    00093   uint32 grfid;
    00094   uint16 stringid;
    00095   StringID def_string;
    00096   GRFText *textholder;
    00097 };
    00098
    00099
    00100 static uint _num_grf_texts = 0;
    00101 static GRFTextEntry _grf_text[(1 << TABSIZE) * 3];
    00102 static byte _currentLangID = GRFLX_ENGLISH;
    00103
    00104
    00105 char *TranslateTTDPatchCodes(uint32 grfid, const char *str)
    00106 {
    00107   char *tmp = MallocT<char>(strlen(str) * 10 + 1); // Allocate space to allow for expansion
    00108   char *d = tmp;
    00109   bool unicode = false;
    00110   WChar c;
    00111   size_t len = Utf8Decode(&c, str);
    00112
    00113   if (c == 0x00DE) {
    00114     /* The thorn ('þ') indicates a unicode string to TTDPatch */
    00115     unicode = true;
    00116     str += len;
    00117   }
    00118
    00119   for (;;) {
    00120     if (unicode && Utf8EncodedCharLen(*str) != 0) {
    00121       c = Utf8Consume(&str);
    00122       /* 'Magic' range of control codes. */
    00123       if (GB(c, 8, 8) == 0xE0) c = GB(c, 0, 8);
    00124     } else {
    00125       c = (byte)*str++;
    00126     }
    00127     if (c == 0) break;
    00128
    00129     switch (c) {
    00130       case 0x01:
    00131         d += Utf8Encode(d, SCC_SETX);
    00132         *d++ = *str++;
    00133         break;
    00134       case 0x0A: break;
    00135       case 0x0D: *d++ = 0x0A; break;
    00136       case 0x0E: d += Utf8Encode(d, SCC_TINYFONT); break;
    00137       case 0x0F: d += Utf8Encode(d, SCC_BIGFONT); break;
    00138       case 0x1F:
    00139         d += Utf8Encode(d, SCC_SETXY);
    00140         *d++ = *str++;
    00141         *d++ = *str++;
    00142         break;
    00143       case 0x7B:
    00144       case 0x7C:
    00145       case 0x7D:
    00146       case 0x7E:
    00147       case 0x7F:
    00148       case 0x80: d += Utf8Encode(d, SCC_NEWGRF_PRINT_DWORD + c - 0x7B); break;
    00149       case 0x81: {
    00150         StringID string;
    00151         string  = ((uint8)*str++);
    00152         string |= ((uint8)*str++) << 8;
    00153         d += Utf8Encode(d, SCC_STRING_ID);
    00154         d += Utf8Encode(d, MapGRFStringID(grfid, string));
    00155         break;
    00156       }
    00157       case 0x82:
    00158       case 0x83:
    00159       case 0x84: d += Utf8Encode(d, SCC_NEWGRF_PRINT_WORD_SPEED + c - 0x82); break;
    00160       case 0x85: d += Utf8Encode(d, SCC_NEWGRF_DISCARD_WORD);       break;
    00161       case 0x86: d += Utf8Encode(d, SCC_NEWGRF_ROTATE_TOP_4_WORDS); break;
    00162       case 0x87: d += Utf8Encode(d, SCC_NEWGRF_PRINT_WORD_LITRES);  break;
    00163       case 0x88: d += Utf8Encode(d, SCC_BLUE);    break;
    00164       case 0x89: d += Utf8Encode(d, SCC_SILVER);  break;
    00165       case 0x8A: d += Utf8Encode(d, SCC_GOLD);    break;
    00166       case 0x8B: d += Utf8Encode(d, SCC_RED);     break;
    00167       case 0x8C: d += Utf8Encode(d, SCC_PURPLE);  break;
    00168       case 0x8D: d += Utf8Encode(d, SCC_LTBROWN); break;
    00169       case 0x8E: d += Utf8Encode(d, SCC_ORANGE);  break;
    00170       case 0x8F: d += Utf8Encode(d, SCC_GREEN);   break;
    00171       case 0x90: d += Utf8Encode(d, SCC_YELLOW);  break;
    00172       case 0x91: d += Utf8Encode(d, SCC_DKGREEN); break;
    00173       case 0x92: d += Utf8Encode(d, SCC_CREAM);   break;
    00174       case 0x93: d += Utf8Encode(d, SCC_BROWN);   break;
    00175       case 0x94: d += Utf8Encode(d, SCC_WHITE);   break;
    00176       case 0x95: d += Utf8Encode(d, SCC_LTBLUE);  break;
    00177       case 0x96: d += Utf8Encode(d, SCC_GRAY);    break;
    00178       case 0x97: d += Utf8Encode(d, SCC_DKBLUE);  break;
    00179       case 0x98: d += Utf8Encode(d, SCC_BLACK);   break;
    00180       case 0x9A:
    00181         switch (*str++) {
    00182           case 0: // FALL THROUGH
    00183           case 1:
    00184             d += Utf8Encode(d, SCC_NEWGRF_PRINT_QWORD_CURRENCY);
    00185             break;
    00186           case 3: {
    00187             uint16 tmp  = ((uint8)*str++);
    00188             tmp        |= ((uint8)*str++) << 8;
    00189             d += Utf8Encode(d, SCC_NEWGRF_PUSH_WORD);
    00190             d += Utf8Encode(d, tmp);
    00191           } break;
    00192           case 4:
    00193             d += Utf8Encode(d, SCC_NEWGRF_UNPRINT);
    00194             d += Utf8Encode(d, *str++);
    00195             break;
    00196           case 6:
    00197             d += Utf8Encode(d, SCC_NEWGRF_PRINT_HEX_BYTE);
    00198             break;
    00199           case 7:
    00200             d += Utf8Encode(d, SCC_NEWGRF_PRINT_HEX_WORD);
    00201             break;
    00202           case 8:
    00203             d += Utf8Encode(d, SCC_NEWGRF_PRINT_HEX_DWORD);
    00204             break;
    00205
    00206           default:
    00207             grfmsg(1, "missing handler for extended format code");
    00208             break;
    00209         }
    00210         break;
    00211
    00212       case 0x9E: d += Utf8Encode(d, 0x20AC); break; // Euro
    00213       case 0x9F: d += Utf8Encode(d, 0x0178); break; // Y with diaeresis
    00214       case 0xA0: d += Utf8Encode(d, SCC_UPARROW); break;
    00215       case 0xAA: d += Utf8Encode(d, SCC_DOWNARROW); break;
    00216       case 0xAC: d += Utf8Encode(d, SCC_CHECKMARK); break;
    00217       case 0xAD: d += Utf8Encode(d, SCC_CROSS); break;
    00218       case 0xAF: d += Utf8Encode(d, SCC_RIGHTARROW); break;
    00219       case 0xB4: d += Utf8Encode(d, SCC_TRAIN); break;
    00220       case 0xB5: d += Utf8Encode(d, SCC_LORRY); break;
    00221       case 0xB6: d += Utf8Encode(d, SCC_BUS); break;
    00222       case 0xB7: d += Utf8Encode(d, SCC_PLANE); break;
    00223       case 0xB8: d += Utf8Encode(d, SCC_SHIP); break;
    00224       case 0xB9: d += Utf8Encode(d, SCC_SUPERSCRIPT_M1); break;
    00225       case 0xBC: d += Utf8Encode(d, SCC_SMALLUPARROW); break;
    00226       case 0xBD: d += Utf8Encode(d, SCC_SMALLDOWNARROW); break;
    00227       default:
    00228         /* Validate any unhandled character */
    00229         if (!IsValidChar(c, CS_ALPHANUMERAL)) c = '?';
    00230         d += Utf8Encode(d, c);
    00231         break;
    00232     }
    00233   }
    00234
    00235   *d = '\0';
    00236   tmp = ReallocT(tmp, strlen(tmp) + 1);
    00237   return tmp;
    00238 }
    00239
    00240
    00244 StringID AddGRFString(uint32 grfid, uint16 stringid, byte langid_to_add, bool new_scheme, const char *text_to_add, StringID def_string)
    00245 {
    00246   char *translatedtext;
    00247   uint id;
    00248
    00249   /* When working with the old language scheme (grf_version is less than 7) and
    00250    * English or American is among the set bits, simply add it as English in
    00251    * the new scheme, i.e. as langid = 1.
    00252    * If English is set, it is pretty safe to assume the translations are not
    00253    * actually translated.
    00254    */
    00255   if (!new_scheme) {
    00256     if (HASBITS(langid_to_add, GRFLB_AMERICAN | GRFLB_ENGLISH)) {
    00257       langid_to_add = GRFLX_ENGLISH;
    00258     } else {
    00259       StringID ret = STR_EMPTY;
    00260       if (langid_to_add & GRFLB_GERMAN)  ret = AddGRFString(grfid, stringid, GRFLX_GERMAN,  true, text_to_add, def_string);
    00261       if (langid_to_add & GRFLB_FRENCH)  ret = AddGRFString(grfid, stringid, GRFLX_FRENCH,  true, text_to_add, def_string);
    00262       if (langid_to_add & GRFLB_SPANISH) ret = AddGRFString(grfid, stringid, GRFLX_SPANISH, true, text_to_add, def_string);
    00263       return ret;
    00264     }
    00265   }
    00266
    00267   for (id = 0; id < _num_grf_texts; id++) {
    00268     if (_grf_text[id].grfid == grfid && _grf_text[id].stringid == stringid) {
    00269       break;
    00270     }
    00271   }
    00272
    00273   /* Too many strings allocated, return empty */
    00274   if (id == lengthof(_grf_text)) return STR_EMPTY;
    00275
    00276   translatedtext = TranslateTTDPatchCodes(grfid, text_to_add);
    00277
    00278   GRFText *newtext = GRFText::New(langid_to_add, translatedtext);
    00279
    00280   free(translatedtext);
    00281
    00282   /* If we didn't find our stringid and grfid in the list, allocate a new id */
    00283   if (id == _num_grf_texts) _num_grf_texts++;
    00284
    00285   if (_grf_text[id].textholder == NULL) {
    00286     _grf_text[id].grfid      = grfid;
    00287     _grf_text[id].stringid   = stringid;
    00288     _grf_text[id].def_string = def_string;
    00289     _grf_text[id].textholder = newtext;
    00290   } else {
    00291     GRFText **ptext, *text;
    00292     bool replaced = false;
    00293
    00294     /* Loop through all languages and see if we can replace a string */
    00295     for (ptext = &_grf_text[id].textholder; (text = *ptext) != NULL; ptext = &text->next) {
    00296       if (text->langid != langid_to_add) continue;
    00297       newtext->next = text->next;
    00298       *ptext = newtext;
    00299       delete text;
    00300       replaced = true;
    00301       break;
    00302     }
    00303
    00304     /* If a string wasn't replaced, then we must append the new string */
    00305     if (!replaced) *ptext = newtext;
    00306   }
    00307
    00308   grfmsg(3, "Added 0x%X: grfid %08X string 0x%X lang 0x%X string '%s'", id, grfid, stringid, newtext->langid, newtext->text);
    00309
    00310   return (GRFTAB << TABSIZE) + id;
    00311 }
    00312
    00313 /* Used to remember the grfid that the last retrieved string came from */
    00314 static uint32 _last_grfid = 0;
    00315
    00319 StringID GetGRFStringID(uint32 grfid, uint16 stringid)
    00320 {
    00321   uint id;
    00322
    00323   /* grfid is zero when we're being called via an include */
    00324   if (grfid == 0) grfid = _last_grfid;
    00325
    00326   for (id = 0; id < _num_grf_texts; id++) {
    00327     if (_grf_text[id].grfid == grfid && _grf_text[id].stringid == stringid) {
    00328       return (GRFTAB << TABSIZE) + id;
    00329     }
    00330   }
    00331
    00332   return STR_UNDEFINED;
    00333 }
    00334
    00335
    00336 const char *GetGRFStringPtr(uint16 stringid)
    00337 {
    00338   const GRFText *default_text = NULL;
    00339   const GRFText *search_text;
    00340
    00341   assert(_grf_text[stringid].grfid != 0);
    00342
    00343   /* Remember this grfid in case the string has included text */
    00344   _last_grfid = _grf_text[stringid].grfid;
    00345
    00346   /* Search the list of lang-strings of this stringid for current lang */
    00347   for (search_text = _grf_text[stringid].textholder; search_text != NULL; search_text = search_text->next) {
    00348     if (search_text->langid == _currentLangID) {
    00349       return search_text->text;
    00350     }
    00351
    00352     /* If the current string is English or American, set it as the
    00353      * fallback language if the specific language isn't available. */
    00354     if (search_text->langid == GRFLX_UNSPECIFIED || (default_text == NULL && (search_text->langid == GRFLX_ENGLISH || search_text->langid == GRFLX_AMERICAN))) {
    00355       default_text = search_text;
    00356     }
    00357   }
    00358
    00359   /* If there is a fallback string, return that */
    00360   if (default_text != NULL) return default_text->text;
    00361
    00362   /* Use the default string ID if the fallback string isn't available */
    00363   return GetStringPtr(_grf_text[stringid].def_string);
    00364 }
    00365
    00374 void SetCurrentGrfLangID(byte language_id)
    00375 {
    00376   _currentLangID = language_id;
    00377 }
    00378
    00379 bool CheckGrfLangID(byte lang_id, byte grf_version)
    00380 {
    00381   if (grf_version < 7) {
    00382     switch (_currentLangID) {
    00383       case GRFLX_GERMAN:  return (lang_id & GRFLB_GERMAN)  != 0;
    00384       case GRFLX_FRENCH:  return (lang_id & GRFLB_FRENCH)  != 0;
    00385       case GRFLX_SPANISH: return (lang_id & GRFLB_SPANISH) != 0;
    00386       default:            return (lang_id & (GRFLB_ENGLISH | GRFLB_AMERICAN)) != 0;
    00387     }
    00388   }
    00389
    00390   return (lang_id == _currentLangID || lang_id == GRFLX_UNSPECIFIED);
    00391 }
    00392
    00397 void CleanUpStrings()
    00398 {
    00399   uint id;
    00400
    00401   for (id = 0; id < _num_grf_texts; id++) {
    00402     GRFText *grftext = _grf_text[id].textholder;
    00403     while (grftext != NULL) {
    00404       GRFText *grftext2 = grftext->next;
    00405       delete grftext;
    00406       grftext = grftext2;
    00407     }
    00408     _grf_text[id].grfid      = 0;
    00409     _grf_text[id].stringid   = 0;
    00410     _grf_text[id].textholder = NULL;
    00411   }
    00412
    00413   _num_grf_texts = 0;
    00414 }
    00415
    00416 struct TextRefStack {
    00417   byte stack[0x30];
    00418   byte position;
    00419   bool used;
    00420
    00421   TextRefStack() : used(false) {}
    00422
    00423   uint8  PopUnsignedByte()  { assert(this->position < lengthof(this->stack)); return this->stack[this->position++]; }
    00424   int8   PopSignedByte()    { return (int8)this->PopUnsignedByte(); }
    00425
    00426   uint16 PopUnsignedWord()
    00427   {
    00428     uint16 val = this->PopUnsignedByte();
    00429     return val | (this->PopUnsignedByte() << 8);
    00430   }
    00431   int16  PopSignedWord()    { return (int32)this->PopUnsignedWord(); }
    00432
    00433   uint32 PopUnsignedDWord()
    00434   {
    00435     uint32 val = this->PopUnsignedWord();
    00436     return val | (this->PopUnsignedWord() << 16);
    00437   }
    00438   int32  PopSignedDWord()   { return (int32)this->PopUnsignedDWord(); }
    00439
    00440   uint64 PopUnsignedQWord()
    00441   {
    00442     uint64 val = this->PopUnsignedDWord();
    00443     return val | (((uint64)this->PopUnsignedDWord()) << 32);
    00444   }
    00445   int64  PopSignedQWord()   { return (int64)this->PopUnsignedQWord(); }
    00446
    00448   void RotateTop4Words()
    00449   {
    00450     byte tmp[2];
    00451     for (int i = 0; i  < 2; i++) tmp[i] = this->stack[this->position + i + 6];
    00452     for (int i = 5; i >= 0; i--) this->stack[this->position + i + 2] = this->stack[this->position + i];
    00453     for (int i = 0; i  < 2; i++) this->stack[this->position + i] = tmp[i];
    00454   }
    00455
    00456   void PushWord(uint16 word)
    00457   {
    00458     if (this->position >= 2) {
    00459       this->position -= 2;
    00460     } else {
    00461       for (int i = lengthof(stack) - 1; i >= this->position + 2; i--) {
    00462         this->stack[i] = this->stack[i - 2];
    00463       }
    00464     }
    00465     this->stack[this->position]     = GB(word, 0, 8);
    00466     this->stack[this->position + 1] = GB(word, 8, 8);
    00467   }
    00468
    00469   void ResetStack()  { this->position = 0; this->used = true; }
    00470   void RewindStack() { this->position = 0; }
    00471 };
    00472
    00473 static TextRefStack _newgrf_normal_textrefstack;
    00474 static TextRefStack _newgrf_error_textrefstack;
    00475
    00477 static TextRefStack *_newgrf_textrefstack = &_newgrf_normal_textrefstack;
    00478
    00483 void PrepareTextRefStackUsage(byte numEntries)
    00484 {
    00485   extern TemporaryStorageArray<uint32, 0x110> _temp_store;
    00486
    00487   _newgrf_textrefstack->ResetStack();
    00488
    00489   byte *p = _newgrf_textrefstack->stack;
    00490   for (uint i = 0; i < numEntries; i++) {
    00491     for (uint j = 0; j < 32; j += 8) {
    00492       *p = GB(_temp_store.Get(0x100 + i), j, 8);
    00493       p++;
    00494     }
    00495   }
    00496 }
    00497
    00499 void StopTextRefStackUsage() { _newgrf_textrefstack->used = false; }
    00500
    00501 void SwitchToNormalRefStack()
    00502 {
    00503   _newgrf_textrefstack = &_newgrf_normal_textrefstack;
    00504 }
    00505
    00506 void SwitchToErrorRefStack()
    00507 {
    00508   _newgrf_textrefstack = &_newgrf_error_textrefstack;
    00509 }
    00510
    00511 void RewindTextRefStack()
    00512 {
    00513   _newgrf_textrefstack->RewindStack();
    00514 }
    00515
    00522 uint RemapNewGRFStringControlCode(uint scc, char **buff, const char **str, int64 *argv)
    00523 {
    00524   if (_newgrf_textrefstack->used) {
    00525     switch (scc) {
    00526       default: NOT_REACHED();
    00527       case SCC_NEWGRF_PRINT_SIGNED_BYTE:    *argv = _newgrf_textrefstack->PopSignedByte();    break;
    00528       case SCC_NEWGRF_PRINT_SIGNED_WORD:    *argv = _newgrf_textrefstack->PopSignedWord();    break;
    00529       case SCC_NEWGRF_PRINT_QWORD_CURRENCY: *argv = _newgrf_textrefstack->PopUnsignedQWord(); break;
    00530
    00531       case SCC_NEWGRF_PRINT_DWORD_CURRENCY:
    00532       case SCC_NEWGRF_PRINT_DWORD:          *argv = _newgrf_textrefstack->PopSignedDWord();   break;
    00533
    00534       case SCC_NEWGRF_PRINT_HEX_BYTE:       *argv = _newgrf_textrefstack->PopUnsignedByte();  break;
    00535       case SCC_NEWGRF_PRINT_HEX_DWORD:      *argv = _newgrf_textrefstack->PopUnsignedDWord(); break;
    00536
    00537       case SCC_NEWGRF_PRINT_HEX_WORD:
    00538       case SCC_NEWGRF_PRINT_WORD_SPEED:
    00539       case SCC_NEWGRF_PRINT_WORD_LITRES:
    00540       case SCC_NEWGRF_PRINT_UNSIGNED_WORD:  *argv = _newgrf_textrefstack->PopUnsignedWord();  break;
    00541
    00542       case SCC_NEWGRF_PRINT_DATE:
    00543       case SCC_NEWGRF_PRINT_MONTH_YEAR:     *argv = _newgrf_textrefstack->PopSignedWord() + DAYS_TILL_ORIGINAL_BASE_YEAR; break;
    00544
    00545       case SCC_NEWGRF_DISCARD_WORD:         _newgrf_textrefstack->PopUnsignedWord(); break;
    00546
    00547       case SCC_NEWGRF_ROTATE_TOP_4_WORDS:   _newgrf_textrefstack->RotateTop4Words(); break;
    00548       case SCC_NEWGRF_PUSH_WORD:            _newgrf_textrefstack->PushWord(Utf8Consume(str)); break;
    00549       case SCC_NEWGRF_UNPRINT:              *buff -= Utf8Consume(str); break;
    00550
    00551       case SCC_NEWGRF_PRINT_STRING_ID:
    00552         *argv = _newgrf_textrefstack->PopUnsignedWord();
    00553         if (*argv == STR_NULL) *argv = STR_EMPTY;
    00554         break;
    00555     }
    00556   }
    00557
    00558   switch (scc) {
    00559     default: NOT_REACHED();
    00560     case SCC_NEWGRF_PRINT_DWORD:
    00561     case SCC_NEWGRF_PRINT_SIGNED_WORD:
    00562     case SCC_NEWGRF_PRINT_SIGNED_BYTE:
    00563     case SCC_NEWGRF_PRINT_UNSIGNED_WORD:
    00564       return SCC_COMMA;
    00565
    00566     case SCC_NEWGRF_PRINT_HEX_BYTE:
    00567     case SCC_NEWGRF_PRINT_HEX_WORD:
    00568     case SCC_NEWGRF_PRINT_HEX_DWORD:
    00569       return SCC_HEX;
    00570
    00571     case SCC_NEWGRF_PRINT_DWORD_CURRENCY:
    00572     case SCC_NEWGRF_PRINT_QWORD_CURRENCY:
    00573       return SCC_CURRENCY;
    00574
    00575     case SCC_NEWGRF_PRINT_STRING_ID:
    00576       return SCC_STRING1;
    00577
    00578     case SCC_NEWGRF_PRINT_DATE:
    00579       return SCC_DATE_LONG;
    00580
    00581     case SCC_NEWGRF_PRINT_MONTH_YEAR:
    00582       return SCC_DATE_TINY;
    00583
    00584     case SCC_NEWGRF_PRINT_WORD_SPEED:
    00585       return SCC_VELOCITY;
    00586
    00587     case SCC_NEWGRF_PRINT_WORD_LITRES:
    00588       return SCC_VOLUME;
    00589
    00590     case SCC_NEWGRF_DISCARD_WORD:
    00591     case SCC_NEWGRF_ROTATE_TOP_4_WORDS:
    00592     case SCC_NEWGRF_PUSH_WORD:
    00593     case SCC_NEWGRF_UNPRINT:
    00594       return 0;
    00595   }
    00596 }