Decoded: Rogue (1980) by Toy, Arnold, Wichman DOS version (1983) by Mel Sibony and Jon Lane Source file: EXTERN.C Beginner friendly, line-by-line code walkthrough by MaiZure EXTERN.C defines global variables including monsters, player stats, etc. Original code: https://britzl.github.io/roguearchive/ Original code with line numbers http://www.maizure.org/projects/decoded-rogue/EXTERN_linenum.txt 1 COMMENT 2 COMMENT 3 COMMENT 4 COMMENT 5 COMMENT 6 BLANK 7 Includes the game header 8 Includes the console management header 9 BLANK 10 Preprocessor check for log mode (not set) 11 Declares a variable for log files (dead code) 12 End of preprocessor log check 13 Preprocessor check for debug mode (not set) 14 Declares a variable for debug (dead code) 15 End of preprocessor check for debug mode 16 COMMENT 17 COMMENT 18 COMMENT 19 COMMENT 20 Revision number global 21 Version number global 22 BLANK 23 COMMENT 24 COMMENT 25 COMMENT 26 COMMENT 27 Defines a global array of weapon name text 28 Weapon name global char array 29 Weapon name global char array 30 Weapon name global char array 31 Weapon name global char array 32 Weapon name global char array 33 Weapon name global char array 34 Weapon name global char array 35 Weapon name global char array 36 Weapon name global char array 37 Weapon name global char array 38 Empty space in array 39 End of weapon name array definition 40 Defines a global array of armor name text 41 Armor name global char array 42 Armor name global char array 43 Armor name global char array 44 Armor name global char array 45 Armor name global char array 46 Armor name global char array 47 Armor name global char array 48 Armor name global char array 49 End of armor name array definition 50 BLANK 51 Defines a global array for armor generation cumulative chance by type 52 Chance to generate leather armor is 20% 53 Chance to generate ring mail is 15% 54 Chance to generate studded leather is 13% 55 Chance to generate scale mail is 12% 56 Chance to generate chain mail is 10% 57 Chance to generate splint mail is 10% 58 Chance to generate banded mail is 10% 59 Chance to generate plate mail is 5% 60 End of armor generation chance 61 Defines global array of armor class by type (early DnD rules: low=good) 62 Leather armor has AC of 8 63 Ring mail has AC of 7 64 Studded leather has AC of 7 65 Scale mail has AC of 6 66 Chain mail has AC of 5 67 Splint mail has AC of 4 68 Banded mail has AC of 4 69 Plate mail has AC of 3 70 End of armor class array 71 BLANK 72 Defines a global struct array of magic scroll data 73 Monster confusion scrolls appear 8% of the time and are worth 140 gold 74 Magic mapping scrolls appear 5% of the time and are worth 150 gold 75 Hold monster scrolls appear 3% of the time and are worth 180 gold 76 Sleep scrolls appear 5% of the time and are worth 5 gold 77 Enchant armor scrolls appear 8% of the time and are worth 160 gold 78 Identify scrolls appear 27% of the time and are worth 100 gold 79 Scare monster scrolls appear 4% of the time and are worth 200 gold 80 Food detection scrolls appear 4% of the time and are worth 50 gold 81 Teleportation scrolls appear 7% of the time and are worth 165 gold 82 Enchant weapon scrolls appear 10% of the time and are worth 150 gold 83 Create monster scrolls appear 5% of the time and are worth 75 gold 84 Remove curse scrolls appear 8% of the time and are worth 105 gold 85 Aggravate monster scrolls appear 4% of the time and are worth 20 gold 86 Blank paper scrolls appear 1% of the time and are worth 5 gold 87 Vorpalize weapons scrolls appear 1% of the time and are worth 300 gold 88 End of scroll data 89 BLANK 90 Defines a global struct array of magic potion data 91 Confusion potions appear 8% of the time and are worth 5 gold 92 Paralysis potions appear 10% of the time and are worth 5 gold 93 Poison potions appear 8% of the time and are worth 5 gold 94 Strength potions appear 15% of the time and are worth 150 gold 95 See invisible potions appear 2% of the time and are worth 100 gold 96 Healing potions appear 15% of the time and are worth 130 gold 97 If this is a demo version... 98 Advertisement potions appear 6% of the time and are worth 130 gold 99 Otherwise this is the full version and so... 100 Monster detection potions appear 6% of the time and are worth 130 gold 101 End check for demo version 102 Magic detection potions appear 6% of the time and are worth 105 gold 103 Raise level potions appear 2% of the time and are worth 250 gold 104 Extra healing potions appear 5% of the time and are worth 200 gold 105 Haste potions appear 4% of the time and are worth 190 gold 106 Restore strength potions appear 14% of the time and are worth 130 gold 107 Blindness potions appear 4% of the time and are worth 5 gold 108 Thirst quenching potions appear 1% of the time and are worth 5 gold 109 End of potions data 110 BLANK 111 Defines a global struct array of magic rings data 112 Protection rings appear 9% of the time and are worth 400 gold 113 Protection rings appear 9% of the time and are worth 400 gold 114 Protection rings appear 5% of the time and are worth 280 gold 115 Protection rings appear 10% of the time and are worth 420 gold 116 Protection rings appear 10% of the time and are worth 310 gold 117 Protection rings appear 1% of the time and are worth 10 gold 118 Protection rings appear 10% of the time and are worth 10 gold 119 Protection rings appear 8% of the time and are worth 440 gold 120 Protection rings appear 8% of the time and are worth 400 gold 121 Protection rings appear 4% of the time and are worth 460 gold 122 Protection rings appear 9% of the time and are worth 240 gold 123 Protection rings appear 5% of the time and are worth 30 gold 124 Protection rings appear 7% of the time and are worth 470 gold 125 Protection rings appear 5% of the time and are worth 380 gold 126 End of rings data 127 BLANK 128 Defines a global struct array of wand and staff data 129 Light wands/staves appear 12% of the time and are worth 250 gold 130 Striking wands/staves appear 12% of the time and are worth 75 gold 131 Lightning wands/staves appear 12% of the time and are worth 330 gold 132 Fire wands/staves appear 12% of the time and are worth 330 gold 133 Cold wands/staves appear 12% of the time and are worth 330 gold 134 Polymorph wands/staves appear 12% of the time and are worth 310 gold 135 Magic missile wands/staves appear 12% of the time and are worth 170 gold 136 Haste monster wands/staves appear 12% of the time and are worth 5 gold 137 Slow monster wands/staves appear 12% of the time and are worth 350 gold 138 Drain life wands/staves appear 12% of the time and are worth 300 gold 139 Useless wands/staves appear 12% of the time and are worth 5 gold 140 Teleport away wands/staves appear 12% of the time and are worth 340 gold 141 Teleport to wands/staves appear 12% of the time and are worth 50 gold 142 Cancellation wands/staves appear 12% of the time and are worth 280 gold 143 End of wand and staff data 144 BLANK 145 Check if help is defined (it is in ROGUE.H) 146 Set a maximum of 65 help items 147 Define a global array of formatted output strings for control help 148 Help command string 149 Help command string 150 Help command string 151 Help command string 152 Help command string 153 Help command string 154 Help command string 155 Help command string 156 Help command string 157 Help command string 158 Help command string 159 Help command string 160 Help command string 161 Help command string 162 Help command string 163 Help command string 164 Help command string 165 Help command string 166 Help command string 167 Help command string 168 Help command string 169 Help command string 170 Help command string 171 Help command string 172 Help command string 173 Help command string 174 Help command string 175 Help command string 176 Help command string 177 Help command string 178 Help command string 179 Help command string 180 Help command string 181 Help command string 182 Help command string 183 Help command string 184 Help command string 185 Help command string 186 Help command string 187 Help command string 188 Help command string 189 Help command string 190 Help command string 191 Help command string 192 Help command string 193 Help command string 194 Help command string 195 Help command string 196 Help command string 197 Help command string 198 Help command string 199 Help command string 200 Help command string 201 Help command string 202 Help command string 203 Help command string 204 Help command string 205 Help command string 206 Help command string 207 Help command string 208 Help command string 209 Help command string 210 Help command string 211 Help command string 212 Null array element 213 End of help command strings array 214 BLANK 215 Defines the global game symbol help list 216 Game symbol description string 217 Game symbol description string 218 Game symbol description string 219 Game symbol description string 220 Game symbol description string 221 Game symbol description string 222 Game symbol description string 223 Game symbol description string 224 Game symbol description string 225 Game symbol description string 226 Game symbol description string 227 Game symbol description string 228 Game symbol description string 229 COMMENT 230 COMMENT 231 Game symbol description string 232 Game symbol description string 233 Game symbol description string 234 Game symbol description string 235 Game symbol description string 236 Game symbol description string 237 Game symbol description string 238 Game symbol description string 239 Game symbol description string 240 Game symbol description string 241 Game symbol description string 242 Null symbol 243 End of global game symbol help data 244 End for help check 245 COMMENT 246 COMMENT 247 COMMENT 248 BLANK 249 Define a global array for character level (rank) names 250 Level 0 has no name 251 Level 1 is Guild Novice 252 Level 2 is Apprentice 253 Level 3 is Journeyman 254 Level 4 is Adventurer 255 Level 5 is Fighter 256 Level 6 is Warrior 257 Level 7 is Rogue 258 Level 8 is Champion 259 Level 9 is Master Rogue 260 Level 10 is Warlord 261 Level 11 is Hero 262 Level 12 is Guild Master 263 Level 13 is Dragonlord 264 Level 14 is Wizard 265 Level 15 is Rogue Geek 266 Level 16 is Rogue Addict 267 Level 17 is Schmendrick (aka...you might need a life) 268 Level 18 is Gunfighter 269 Level 19 is Time Waster 270 Level 20 is Bug Chaser 271 End of level name array 272 BLANK 273 COMMENT 274 COMMENT 275 COMMENT 276 Global integer for max item count. Init to zero and set later 277 Global integer for reinitialization (used on restart) 278 BLANK 279 Global flag to defer events until after daemon/timer processing 280 Global flag to invalidate the game score 281 Global flag to repeat last command 282 Global flag mask for (un)known scrolls 283 Global flag mask for (un)known potions 284 Global flag mask for (un)known rings 285 Global flag mask for (un)known wands/staves 286 Global flag for if the player has the amulet of Yendor 287 Global flag for if the player has seen, but not picked up, the amulet. 288 COMMENT 289 Global flag to capture door passes during running 290 Global flag used to detect running-break conditions 291 Another global flag used during running 292 COMMENT 293 Global flag to detect player moves 294 COMMENT 295 COMMENT 296 Global flag true when the game is active (this is the game loop var) 297 Global flag for running players 298 Global flag to save messages 299 COMMENT 300 Global flag for terse mode (short text) 301 Global flag for expert mode (ever shorter messages) 302 Check for developer mode (not used) 303 Global flag for developer mode 304 End check for developer mode 305 Global variable for current trap status 306 Check if we're in wizard mode (basically debug/superuser mode) 307 Global flag if wizard mode is enabled 308 End check for wizard mode 309 Global bailout flag. Used for debug detection for several failure cases 310 Declares a global byte holding the type of item the player picks up 311 Declares a global variable hlding player's running direction 312 COMMENT 313 Decalres a global array for actual scroll types 314 Decalres a global array for actual potion types 315 Decalres a global array for actual ring types 316 Decalres a global array for actual wand/staff types 317 COMMENT 318 Declares a global message buffer for the last printed message 319 Declares a global guess array for scrolls 320 Declares a global guess array for potions 321 Declares a global guess array for rings 322 Declares a global guess array for wands/staves 323 COMMENT 324 Declares a global array for all item types during guessing 325 Defines a global integer for indexing arrays during player guessing 326 Declares an array to mask for wands vs sticks 327 BLANK 328 Declares a global variable for screen vertical size (in lines) 329 Declares a global tracking variable for furthest player level progress 330 Declares a global trap counter for the level 331 Declares a global dungeon number tracker (number of games played) 332 Defines a global for current level number 333 Defines a global integer for tracking player gold 334 Defines a global for cursor horizontal position 335 Defines a global counter for no player movement turns 336 Defines a global counter for turns that player cannot execute commands 337 Defines a global inventory counter 338 Defines a global memory tracker 339 Defines a global counter for counting levels without food 340 Defines a global counter for command repeats 341 Defines a global counter for fungus hits on player (freeze/drain effect) 342 Defines a global counter for turns without combat (healing daemon) 343 Defines a global integer for player's hunger level 344 Defines a global number for group (not used) 345 Defines a global flag for the player's hunger state 346 Defines a global checksum comparison used in copy protection (not used) 347 Declares a global long for random number seed (32-bit in this era) 348 BLANK 349 Defines a global integer for player hit damage multiplier 350 Defines global integer meant for copy protection check (disabled) 351 Defines a global text string meant for copy protection failure 352 Defines a global text string meant for copy protection failure 353 Defines a global pointer, probably meant for player (appears dead) 354 BLANK 355 COMMENT 356 BLANK 357 Defines a coord struct (x,y pair) for the player's last drawn location 358 Defines a coord struct for the last movement direction 359 BLANK 360 Global pointer to the player's current armor 361 Global pointers to the player's current rings 362 Global pointer to the player's current weapon 363 BLANK 364 Global pointer to a room of interest 365 Global array of level rooms 366 Global array of passage information. These are initialized as null 367 Initializing passage to null 368 Initializing passage to null 369 Initializing passage to null 370 Initializing passage to null 371 Initializing passage to null 372 Initializing passage to null 373 Initializing passage to null 374 Initializing passage to null 375 Initializing passage to null 376 Initializing passage to null 377 Initializing passage to null 378 Initializing passage to null 379 Initializing passage to null 380 Initializing passage to null 381 BLANK 382 Defines a preprocessor macro for the initial player stats 383 BLANK 384 Sets the maximum stats for the player using the previous macro 385 BLANK 386 Global reference for the player 387 Global pointer to the level object linked list 388 Global pointer to the level monster linked list 389 BLANK 390 Preprocessor macro to plug enemy hitpoint values 391 Preprocessor macro to plug enemy strength values 392 Defines the global structure of monster data, including strength, experience, level, armor, hitpoints, damage range, and special behavior flags. 393 BLOCK START - Monster data structure 394 COMMENT 395 Aquator stats 396 Bat stats 397 Centaur stats 398 Dragon stats (toughest enemy!) 399 Emu stats 400 COMMENT 401 COMMENT 402 Venus flytrap stats 403 Griffin stats 404 Hobgoblin stats 405 Ice monster stats 406 Jabberwock stats 407 Kestral stats 408 Leprechaun stats 409 Medusa stats 410 Nymph stats 411 Orc stats 412 Phantom stats 413 Quagga stats 414 Rattlesnake stats 415 Slime stats 416 Troll stats 417 Ur-vile stats 418 Vampire stats 419 Wraith stats 420 Xeroc stats 421 Yeti stats 422 Zombie stats 423 BLOCK END - Monster data structure 424 Global string holder for monster damage data 425 Removes preprocessor macro for hitpoints 426 Removes preprocessor macro for strength 427 BLANK 428 Defines the global item probability table by type 429 Potions generate 27% of the time 430 Scrolls generate 30% of the time 431 Food generate 17% of the time 432 Weapons generate 8% of the time 433 Armor generate 8% of the time 434 Rings generate 5% of the time 435 Wands/staves generate 5% of the time 436 End of global item probability data 437 BLANK 438 COMMENT 439 COMMENT 440 COMMENT 441 Global empty string 442 Global reference to the empty string 443 BLANK 444 Global common string 445 Global common string 446 Global common string 447 Global common string 448 Global common string 449 Global common string 450 EOF�