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/**************************************************************************** * Copyright (c) 1998-2012,2013 Free Software Foundation, Inc. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the * * "Software"), to deal in the Software without restriction, including * * without limitation the rights to use, copy, modify, merge, publish, * * distribute, distribute with modifications, sublicense, and/or sell * * copies of the Software, and to permit persons to whom the Software is * * furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included * * in all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * * * * Except as contained in this notice, the name(s) of the above copyright * * holders shall not be used in advertising or otherwise to promote the * * sale, use or other dealings in this Software without prior written * * authorization. * ***************************************************************************/ / * bs.c - original author: Bruce Holloway * salvo option by: Chuck A DeGaul * with improved user interface, autoconfiguration and code cleanup * by Eric S. Raymond <esr@snark.thyrsus.com> * v1.2 with color support and minor portability fixes, November 1990 * v2.0 featuring strict ANSI/POSIX conformance, November 1993. * v2.1 with ncurses mouse support, September 1995 * * $Id: bs.c,v 1.61 2013/04/27 19:46:53 tom Exp $ / #include <test.priv.h> #include <time.h> #ifndef SIGIOT #define SIGIOT SIGABRT #endif static int getcoord(int); / * Constants for tuning the random-fire algorithm. It prefers moves that * diagonal-stripe the board with a stripe separation of srchstep. If * no such preferred moves are found, srchstep is decremented. / #define BEGINSTEP 3 / initial value of srchstep / / miscellaneous constants / #define SHIPTYPES 5 #define OTHER (1-turn) #define PLAYER 0 #define COMPUTER 1 #define MARK_HIT 'H' #define MARK_MISS 'o' #define CTRLC '\003' / used as terminate command / #define FF '\014' / used as redraw command / / coordinate handling / #define BWIDTH 10 #define BDEPTH 10 / display symbols / #define SHOWHIT '' #define SHOWSPLASH ' ' #define IS_SHIP(c) (isupper(UChar(c)) ? TRUE : FALSE) /* how to position us on player board / #define PYBASE 3 #define PXBASE 3 #define PY(y) (PYBASE + (y)) #define PX(x) (PXBASE + (x)3) #define pgoto(y, x) (void)move(PY(y), PX(x)) /* how to position us on cpu board / #define CYBASE 3 #define CXBASE 48 #define CY(y) (CYBASE + (y)) #define CX(x) (CXBASE + (x)3) #define CYINV(y) ((y) - CYBASE) #define CXINV(x) (((x) - CXBASE) / 3) #define cgoto(y, x) (void)move(CY(y), CX(x)) #define ONBOARD(x, y) (x >= 0 && x < BWIDTH && y >= 0 && y < BDEPTH) /* other board locations / #define COLWIDTH 80 #define PROMPTLINE 21 / prompt line / #define SYBASE CYBASE + BDEPTH + 3 / move key diagram / #define SXBASE 63 #define MYBASE SYBASE - 1 / diagram caption / #define MXBASE 64 #define HYBASE SYBASE - 1 / help area / #define HXBASE 0 / this will need to be changed if BWIDTH changes / static char numbers[] = " 0 1 2 3 4 5 6 7 8 9"; static char carrier[] = "Aircraft Carrier"; static char battle[] = "Battleship"; static char sub[] = "Submarine"; static char destroy[] = "Destroyer"; static char ptboat[] = "PT Boat"; static char your_name; static char dftname[] = "stranger"; /* direction constants / #define E 0 #define SE 1 #define S 2 #define SW 3 #define W 4 #define NW 5 #define N 6 #define NE 7 static int xincr[8] = {1, 1, 0, -1, -1, -1, 0, 1}; static int yincr[8] = {0, 1, 1, 1, 0, -1, -1, -1}; / current ship position and direction / static int curx = (BWIDTH / 2); static int cury = (BDEPTH / 2); typedef struct { char name; /* name of the ship type / int hits; / how many times has this ship been hit? / char symbol; / symbol for game purposes / int length; / length of ship / int x, y; / coordinates of ship start point / int dir; / direction of `bow' / bool placed; / has it been placed on the board? / } ship_t; static bool checkplace(int b, ship_t ss, int vis); #define SHIPIT(name, symbol, length) { name, 0, symbol, length, 0,0, 0, FALSE } static ship_t plyship[SHIPTYPES] = { SHIPIT(carrier, 'A', 5), SHIPIT(battle, 'B', 4), SHIPIT(destroy, 'D', 3), SHIPIT(sub, 'S', 3), SHIPIT(ptboat, 'P', 2), }; static ship_t cpuship[SHIPTYPES] = { SHIPIT(carrier, 'A', 5), SHIPIT(battle, 'B', 4), SHIPIT(destroy, 'D', 3), SHIPIT(sub, 'S', 3), SHIPIT(ptboat, 'P', 2), }; /* "Hits" board, and main board. / static char hits[2][BWIDTH][BDEPTH]; static char board[2][BWIDTH][BDEPTH]; static int turn; / 0=player, 1=computer / static int plywon = 0, cpuwon = 0; / How many games has each won? / static int salvo, blitz, closepack; #define PR (void)addstr static void uninitgame(int sig) GCC_NORETURN; static void uninitgame(int sig GCC_UNUSED) / end the game, either normally or due to signal / { clear(); (void) refresh(); (void) reset_shell_mode(); (void) echo(); (void) endwin(); ExitProgram(sig ? EXIT_FAILURE : EXIT_SUCCESS); } static void announceopts(void) / announce which game options are enabled / { if (salvo \|\| blitz \|\| closepack) { (void) printw("Playing optional game ("); if (salvo) (void) printw("salvo, "); else (void) printw("nosalvo, "); if (blitz) (void) printw("blitz "); else (void) printw("noblitz, "); if (closepack) (void) printw("closepack)"); else (void) printw("noclosepack)"); } else (void) printw( "Playing standard game (noblitz, nosalvo, noclosepack)"); } static void intro(void) { char tmpname; srand((unsigned) (time(0L) + getpid())); /* Kick the random number generator / CATCHALL(uninitgame); if ((tmpname = getlogin()) != 0 && (your_name = strdup(tmpname)) != 0) { your_name[0] = (char) toupper(UChar(your_name[0])); } else { your_name = dftname; } (void) initscr(); keypad(stdscr, TRUE); (void) def_prog_mode(); (void) nonl(); (void) cbreak(); (void) noecho(); #ifdef PENGUIN (void) clear(); MvAddStr(4, 29, "Welcome to Battleship!"); (void) move(8, 0); PR(" \\\n"); PR(" \\ \\ \\\n"); PR(" \\ \\ \\ \\ \\_____________\n"); PR(" \\ \\ \\_____________ \\ \\/ \|\n"); PR(" \\ \\/ \\ \\/ \|\n"); PR(" \\/ \\_____/ \|__\n"); PR(" ________________/ \|\n"); PR(" \\ S.S. Penguin \|\n"); PR(" \\ /\n"); PR(" \\___________________________________________________/\n"); MvAddStr(22, 27, "Hit any key to continue..."); (void) refresh(); (void) getch(); #endif / PENGUIN / #ifdef A_COLOR start_color(); init_pair(COLOR_BLACK, COLOR_BLACK, COLOR_BLACK); init_pair(COLOR_GREEN, COLOR_GREEN, COLOR_BLACK); init_pair(COLOR_RED, COLOR_RED, COLOR_BLACK); init_pair(COLOR_CYAN, COLOR_CYAN, COLOR_BLACK); init_pair(COLOR_WHITE, COLOR_WHITE, COLOR_BLACK); init_pair(COLOR_MAGENTA, COLOR_MAGENTA, COLOR_BLACK); init_pair(COLOR_BLUE, COLOR_BLUE, COLOR_BLACK); init_pair(COLOR_YELLOW, COLOR_YELLOW, COLOR_BLACK); #endif / A_COLOR / #ifdef NCURSES_MOUSE_VERSION (void) mousemask(BUTTON1_CLICKED, (mmask_t ) NULL); #endif /* NCURSES_MOUSE_VERSION / } / VARARGS1 / static void prompt(int n, NCURSES_CONST char f, const char s) / print a message at the prompt line / { (void) move(PROMPTLINE + n, 0); (void) clrtoeol(); (void) printw(f, s); (void) refresh(); } static void error(NCURSES_CONST char s) { (void) move(PROMPTLINE + 2, 0); (void) clrtoeol(); if (s) { (void) addstr(s); (void) beep(); } } static void placeship(int b, ship_t * ss, int vis) { int l; for (l = 0; l < ss->length; ++l) { int newx = ss->x + l * xincr[ss->dir]; int newy = ss->y + l * yincr[ss->dir]; board[b][newx][newy] = ss->symbol; if (vis) { pgoto(newy, newx); (void) addch((chtype) ss->symbol); } } ss->hits = 0; } static int rnd(int n) { return (((rand() & 0x7FFF) % n)); } static void randomplace(int b, ship_t * ss) /* generate a valid random ship placement into px,py / { do { ss->dir = rnd(2) ? E : S; ss->x = rnd(BWIDTH - (ss->dir == E ? ss->length : 0)); ss->y = rnd(BDEPTH - (ss->dir == S ? ss->length : 0)); } while (!checkplace(b, ss, FALSE)); } static void initgame(void) { int i, j, unplaced; ship_t ss; (void) clear(); MvAddStr(0, 35, "BATTLESHIPS"); (void) move(PROMPTLINE + 2, 0); announceopts(); memset(board, 0, sizeof(char) * BWIDTH * BDEPTH * 2); memset(hits, 0, sizeof(char) * BWIDTH * BDEPTH * 2); for (i = 0; i < SHIPTYPES; i++) { ss = cpuship + i; ss->x = ss->y = ss->dir = ss->hits = 0; ss->placed = FALSE; ss = plyship + i; ss->x = ss->y = ss->dir = ss->hits = 0; ss->placed = FALSE; } /* draw empty boards / MvAddStr(PYBASE - 2, PXBASE + 5, "Main Board"); MvAddStr(PYBASE - 1, PXBASE - 3, numbers); for (i = 0; i < BDEPTH; ++i) { MvAddCh(PYBASE + i, PXBASE - 3, (chtype) (i + 'A')); #ifdef A_COLOR if (has_colors()) attron((attr_t) COLOR_PAIR(COLOR_BLUE)); #endif / A_COLOR / (void) addch(' '); for (j = 0; j < BWIDTH; j++) (void) addstr(" . "); #ifdef A_COLOR (void) attrset(0); #endif / A_COLOR / (void) addch(' '); (void) addch((chtype) (i + 'A')); } MvAddStr(PYBASE + BDEPTH, PXBASE - 3, numbers); MvAddStr(CYBASE - 2, CXBASE + 7, "Hit/Miss Board"); MvAddStr(CYBASE - 1, CXBASE - 3, numbers); for (i = 0; i < BDEPTH; ++i) { MvAddCh(CYBASE + i, CXBASE - 3, (chtype) (i + 'A')); #ifdef A_COLOR if (has_colors()) attron((attr_t) COLOR_PAIR(COLOR_BLUE)); #endif / A_COLOR / (void) addch(' '); for (j = 0; j < BWIDTH; j++) (void) addstr(" . "); #ifdef A_COLOR (void) attrset(0); #endif / A_COLOR / (void) addch(' '); (void) addch((chtype) (i + 'A')); } MvAddStr(CYBASE + BDEPTH, CXBASE - 3, numbers); MvPrintw(HYBASE, HXBASE, "To position your ships: move the cursor to a spot, then"); MvPrintw(HYBASE + 1, HXBASE, "type the first letter of a ship type to select it, then"); MvPrintw(HYBASE + 2, HXBASE, "type a direction ([hjkl] or [4862]), indicating how the"); MvPrintw(HYBASE + 3, HXBASE, "ship should be pointed. You may also type a ship letter"); MvPrintw(HYBASE + 4, HXBASE, "followed by `r' to position it randomly, or type `R' to"); MvPrintw(HYBASE + 5, HXBASE, "place all remaining ships randomly."); MvAddStr(MYBASE, MXBASE, "Aiming keys:"); MvAddStr(SYBASE, SXBASE, "y k u 7 8 9"); MvAddStr(SYBASE + 1, SXBASE, " \\\|/ \\\|/ "); MvAddStr(SYBASE + 2, SXBASE, "h-+-l 4-+-6"); MvAddStr(SYBASE + 3, SXBASE, " /\|\\ /\|\\ "); MvAddStr(SYBASE + 4, SXBASE, "b j n 1 2 3"); / have the computer place ships / for (ss = cpuship; ss < cpuship + SHIPTYPES; ss++) { randomplace(COMPUTER, ss); placeship(COMPUTER, ss, FALSE); } do { char c, docked[SHIPTYPES + 2], cp = docked; ss = (ship_t ) NULL; / figure which ships still wait to be placed / cp++ = 'R'; for (i = 0; i < SHIPTYPES; i++) if (!plyship[i].placed) cp++ = plyship[i].symbol; cp = '\0'; /* get a command letter / prompt(1, "Type one of [%s] to pick a ship.", docked + 1); do { c = (char) getcoord(PLAYER); } while (!strchr(docked, c)); if (c == 'R') (void) ungetch('R'); else { / map that into the corresponding symbol / for (ss = plyship; ss < plyship + SHIPTYPES; ss++) if (ss->symbol == c) break; prompt(1, "Type one of [hjklrR] to place your %s.", ss->name); pgoto(cury, curx); } do { c = (char) getch(); } while (!(strchr("hjkl8462rR", c) \|\| c == FF)); if (c == FF) { (void) clearok(stdscr, TRUE); (void) refresh(); } else if (ss == 0) { beep(); / simple to verify, unlikely to happen / } else if (c == 'r') { prompt(1, "Random-placing your %s", ss->name); randomplace(PLAYER, ss); placeship(PLAYER, ss, TRUE); error((char ) NULL); ss->placed = TRUE; } else if (c == 'R') { prompt(1, "Placing the rest of your fleet at random...", ""); for (ss = plyship; ss < plyship + SHIPTYPES; ss++) if (!ss->placed) { randomplace(PLAYER, ss); placeship(PLAYER, ss, TRUE); ss->placed = TRUE; } error((char ) NULL); } else if (strchr("hjkl8462", c)) { ss->x = curx; ss->y = cury; switch (c) { case 'k': case '8': ss->dir = N; break; case 'j': case '2': ss->dir = S; break; case 'h': case '4': ss->dir = W; break; case 'l': case '6': ss->dir = E; break; } if (checkplace(PLAYER, ss, TRUE)) { placeship(PLAYER, ss, TRUE); error((char ) NULL); ss->placed = TRUE; } } for (unplaced = i = 0; i < SHIPTYPES; i++) unplaced += !plyship[i].placed; } while (unplaced); turn = rnd(2); MvPrintw(HYBASE, HXBASE, "To fire, move the cursor to your chosen aiming point "); MvPrintw(HYBASE + 1, HXBASE, "and strike any key other than a motion key. "); MvPrintw(HYBASE + 2, HXBASE, " "); MvPrintw(HYBASE + 3, HXBASE, " "); MvPrintw(HYBASE + 4, HXBASE, " "); MvPrintw(HYBASE + 5, HXBASE, " "); (void) prompt(0, "Press any key to start...", ""); (void) getch(); } static int getcoord(int atcpu) { int ny, nx, c; if (atcpu) cgoto(cury, curx); else pgoto(cury, curx); (void) refresh(); for (;;) { if (atcpu) { MvPrintw(CYBASE + BDEPTH + 1, CXBASE + 11, "(%d, %c)", curx, 'A' + cury); cgoto(cury, curx); } else { MvPrintw(PYBASE + BDEPTH + 1, PXBASE + 11, "(%d, %c)", curx, 'A' + cury); pgoto(cury, curx); } switch (c = getch()) { case 'k': case '8': case KEY_UP: ny = cury + BDEPTH - 1; nx = curx; break; case 'j': case '2': case KEY_DOWN: ny = cury + 1; nx = curx; break; case 'h': case '4': case KEY_LEFT: ny = cury; nx = curx + BWIDTH - 1; break; case 'l': case '6': case KEY_RIGHT: ny = cury; nx = curx + 1; break; case 'y': case '7': case KEY_A1: ny = cury + BDEPTH - 1; nx = curx + BWIDTH - 1; break; case 'b': case '1': case KEY_C1: ny = cury + 1; nx = curx + BWIDTH - 1; break; case 'u': case '9': case KEY_A3: ny = cury + BDEPTH - 1; nx = curx + 1; break; case 'n': case '3': case KEY_C3: ny = cury + 1; nx = curx + 1; break; case FF: nx = curx; ny = cury; (void) clearok(stdscr, TRUE); (void) refresh(); break; #ifdef NCURSES_MOUSE_VERSION case KEY_MOUSE: { MEVENT myevent; getmouse(&myevent); if (atcpu && myevent.y >= CY(0) && myevent.y <= CY(BDEPTH) && myevent.x >= CX(0) && myevent.x <= CX(BDEPTH)) { curx = CXINV(myevent.x); cury = CYINV(myevent.y); return (' '); } else { beep(); continue; } } /* no fall through / #endif / NCURSES_MOUSE_VERSION / default: if (atcpu) MvAddStr(CYBASE + BDEPTH + 1, CXBASE + 11, " "); else MvAddStr(PYBASE + BDEPTH + 1, PXBASE + 11, " "); return (c); } curx = nx % BWIDTH; cury = ny % BDEPTH; } } static bool collidecheck(int b, int y, int x) / is this location on the selected zboard adjacent to a ship? / { bool collide; / anything on the square / if ((collide = IS_SHIP(board[b][x][y])) != FALSE) return (collide); / anything on the neighbors / if (!closepack) { int i; for (i = 0; i < 8; i++) { int xend, yend; yend = y + yincr[i]; xend = x + xincr[i]; if (ONBOARD(xend, yend) && IS_SHIP(board[b][xend][yend])) { collide = TRUE; break; } } } return (collide); } static bool checkplace(int b, ship_t ss, int vis) { int l, xend, yend; /* first, check for board edges / xend = ss->x + (ss->length - 1) xincr[ss->dir]; yend = ss->y + (ss->length - 1) * yincr[ss->dir]; if (!ONBOARD(xend, yend)) { if (vis) switch (rnd(3)) { case 0: error("Ship is hanging from the edge of the world"); break; case 1: error("Try fitting it on the board"); break; case 2: error("Figure I won't find it if you put it there?"); break; } return (FALSE); } for (l = 0; l < ss->length; ++l) { if (collidecheck(b, ss->y + l * yincr[ss->dir], ss->x + l * xincr[ss->dir])) { if (vis) switch (rnd(3)) { case 0: error("There's already a ship there"); break; case 1: error("Collision alert! Aaaaaagh!"); break; case 2: error("Er, Admiral, what about the other ship?"); break; } return (FALSE); } } return (TRUE); } static int awinna(void) { int i, j; ship_t ss; for (i = 0; i < 2; ++i) { ss = (i) ? cpuship : plyship; for (j = 0; j < SHIPTYPES; ++j, ++ss) if (ss->length > ss->hits) break; if (j == SHIPTYPES) return (OTHER); } return (-1); } static ship_t hitship(int x, int y) /* register a hit on the targeted ship / { ship_t sb, ss; char sym; int oldx, oldy; getyx(stdscr, oldy, oldx); sb = (turn) ? plyship : cpuship; if ((sym = board[OTHER][x][y]) == 0) return ((ship_t ) NULL); for (ss = sb; ss < sb + SHIPTYPES; ++ss) if (ss->symbol == sym) { if (++ss->hits < ss->length) /* still afloat? / return ((ship_t ) NULL); else { /* sunk! / int i, j; if (!closepack) for (j = -1; j <= 1; j++) { int bx = ss->x + j xincr[(ss->dir + 2) % 8]; int by = ss->y + j * yincr[(ss->dir + 2) % 8]; for (i = -1; i <= ss->length; ++i) { int x1, y1; x1 = bx + i * xincr[ss->dir]; y1 = by + i * yincr[ss->dir]; if (ONBOARD(x1, y1)) { hits[turn][x1][y1] = MARK_MISS; if (turn % 2 == PLAYER) { cgoto(y1, x1); #ifdef A_COLOR if (has_colors()) attron((attr_t) COLOR_PAIR(COLOR_GREEN)); #endif /* A_COLOR / (void) addch(MARK_MISS); #ifdef A_COLOR (void) attrset(0); #endif / A_COLOR / } else { pgoto(y1, x1); (void) addch(SHOWSPLASH); } } } } for (i = 0; i < ss->length; ++i) { int x1 = ss->x + i xincr[ss->dir]; int y1 = ss->y + i * yincr[ss->dir]; hits[turn][x1][y1] = ss->symbol; if (turn % 2 == PLAYER) { cgoto(y1, x1); (void) addch((chtype) (ss->symbol)); } else { pgoto(y1, x1); #ifdef A_COLOR if (has_colors()) attron((attr_t) COLOR_PAIR(COLOR_RED)); #endif /* A_COLOR / (void) addch(SHOWHIT); #ifdef A_COLOR (void) attrset(0); #endif / A_COLOR / } } (void) move(oldy, oldx); return (ss); } } (void) move(oldy, oldx); return ((ship_t ) NULL); } static bool plyturn(void) { ship_t ss; bool hit; NCURSES_CONST char m = NULL; prompt(1, "Where do you want to shoot? ", ""); for (;;) { (void) getcoord(COMPUTER); if (hits[PLAYER][curx][cury]) { prompt(1, "You shelled this spot already! Try again.", ""); beep(); } else break; } hit = IS_SHIP(board[COMPUTER][curx][cury]); hits[PLAYER][curx][cury] = (char) (hit ? MARK_HIT : MARK_MISS); cgoto(cury, curx); #ifdef A_COLOR if (has_colors()) { if (hit) attron((attr_t) COLOR_PAIR(COLOR_RED)); else attron((attr_t) COLOR_PAIR(COLOR_GREEN)); } #endif /* A_COLOR / (void) addch((chtype) hits[PLAYER][curx][cury]); #ifdef A_COLOR (void) attrset(0); #endif / A_COLOR / prompt(1, "You %s.", hit ? "scored a hit" : "missed"); if (hit && (ss = hitship(curx, cury))) { switch (rnd(5)) { case 0: m = " You sank my %s!"; break; case 1: m = " I have this sinking feeling about my %s...."; break; case 2: m = " My %s has gone to Davy Jones's locker!"; break; case 3: m = " Glub, glub -- my %s is headed for the bottom!"; break; case 4: m = " You'll pick up survivors from my %s, I hope...!"; break; } if (m != 0) { (void) printw(m, ss->name); } (void) beep(); } return (hit); } static int sgetc(const char s) { const char s1; int ch; (void) refresh(); for (;;) { ch = getch(); if (islower(ch)) ch = toupper(ch); if (ch == CTRLC) uninitgame(0); for (s1 = s; s1 && ch != s1; ++s1) continue; if (s1) { (void) addch((chtype) ch); (void) refresh(); return (ch); } } } static void randomfire(int px, int py) /* random-fire routine -- implements simple diagonal-striping strategy / { static int turncount = 0; static int srchstep = BEGINSTEP; static int huntoffs; / Offset on search strategy / int ypossible[BWIDTH BDEPTH], xpossible[BWIDTH * BDEPTH], nposs; int ypreferred[BWIDTH * BDEPTH], xpreferred[BWIDTH * BDEPTH], npref; int x, y, i; if (turncount++ == 0) huntoffs = rnd(srchstep); /* first, list all possible moves / nposs = npref = 0; for (x = 0; x < BWIDTH; x++) for (y = 0; y < BDEPTH; y++) if (!hits[COMPUTER][x][y]) { xpossible[nposs] = x; ypossible[nposs] = y; nposs++; if (((x + huntoffs) % srchstep) != (y % srchstep)) { xpreferred[npref] = x; ypreferred[npref] = y; npref++; } } if (npref) { i = rnd(npref); px = xpreferred[i]; py = ypreferred[i]; } else if (nposs) { i = rnd(nposs); px = xpossible[i]; py = ypossible[i]; if (srchstep > 1) --srchstep; } else { error("No moves possible?? Help!"); ExitProgram(EXIT_FAILURE); /NOTREACHED / } } #define S_MISS 0 #define S_HIT 1 #define S_SUNK -1 static int cpufire(int x, int y) / fire away at given location / { bool hit, sunk; ship_t ss = NULL; hit = (bool) board[PLAYER][x][y]; hits[COMPUTER][x][y] = (hit ? MARK_HIT : MARK_MISS); MvPrintw(PROMPTLINE, 0, "I shoot at %c%d. I %s!", y + 'A', x, hit ? "hit" : "miss"); if ((sunk = (hit && (ss = hitship(x, y)))) != 0) (void) printw(" I've sunk your %s", ss->name); (void) clrtoeol(); pgoto(y, x); #ifdef A_COLOR if (has_colors()) { if (hit) attron((attr_t) COLOR_PAIR(COLOR_RED)); else attron((attr_t) COLOR_PAIR(COLOR_GREEN)); } #endif /* A_COLOR / (void) addch((chtype) (hit ? SHOWHIT : SHOWSPLASH)); #ifdef A_COLOR (void) attrset(0); #endif / A_COLOR / return hit ? (sunk ? S_SUNK : S_HIT) : S_MISS; } / * This code implements a fairly irregular FSM, so please forgive the rampant * unstructuredness below. The five labels are states which need to be held * between computer turns. * * The FSM is not externally reset to RANDOM_FIRE if the player wins. Instead, * the other states check for "impossible" conditions which signify a new * game, then if found transition to RANDOM_FIRE. / static bool cputurn(void) { #define POSSIBLE(x, y) (ONBOARD(x, y) && !hits[COMPUTER][x][y]) #define RANDOM_FIRE 0 #define RANDOM_HIT 1 #define HUNT_DIRECT 2 #define FIRST_PASS 3 #define REVERSE_JUMP 4 #define SECOND_PASS 5 static int next = RANDOM_FIRE; static bool used[4]; static ship_t ts; int navail, x, y, d, n; int hit = S_MISS; switch (next) { case RANDOM_FIRE: / last shot was random and missed / refire: randomfire(&x, &y); if (!(hit = cpufire(x, y))) next = RANDOM_FIRE; else { ts.x = x; ts.y = y; ts.hits = 1; next = (hit == S_SUNK) ? RANDOM_FIRE : RANDOM_HIT; } break; case RANDOM_HIT: / last shot was random and hit / used[E / 2] = used[S / 2] = used[W / 2] = used[N / 2] = FALSE; / FALLTHROUGH / case HUNT_DIRECT: / last shot hit, we're looking for ship's long axis / for (d = navail = 0; d < 4; d++) { x = ts.x + xincr[d 2]; y = ts.y + yincr[d * 2]; if (!used[d] && POSSIBLE(x, y)) navail++; else used[d] = TRUE; } if (navail == 0) /* no valid places for shots adjacent... / goto refire; / ...so we must random-fire / else { n = rnd(navail) + 1; for (d = 0; used[d]; d++) ; / used[d] is first that == 0 / for (; n > 1; n--) while (used[++d]) ; / used[d] is next that == 0 / assert(d < 4); assert(used[d] == FALSE); used[d] = TRUE; x = ts.x + xincr[d 2]; y = ts.y + yincr[d * 2]; assert(POSSIBLE(x, y)); if (!(hit = cpufire(x, y))) next = HUNT_DIRECT; else { ts.x = x; ts.y = y; ts.dir = d * 2; ts.hits++; next = (hit == S_SUNK) ? RANDOM_FIRE : FIRST_PASS; } } break; case FIRST_PASS: /* we have a start and a direction now / x = ts.x + xincr[ts.dir]; y = ts.y + yincr[ts.dir]; if (POSSIBLE(x, y) && (hit = cpufire(x, y))) { ts.x = x; ts.y = y; ts.hits++; next = (hit == S_SUNK) ? RANDOM_FIRE : FIRST_PASS; } else next = REVERSE_JUMP; break; case REVERSE_JUMP: / nail down the ship's other end / d = (ts.dir + 4) % 8; x = ts.x + ts.hits xincr[d]; y = ts.y + ts.hits * yincr[d]; if (POSSIBLE(x, y) && (hit = cpufire(x, y))) { ts.x = x; ts.y = y; ts.dir = d; ts.hits++; next = (hit == S_SUNK) ? RANDOM_FIRE : SECOND_PASS; } else next = RANDOM_FIRE; break; case SECOND_PASS: /* continue shooting after reversing / x = ts.x + xincr[ts.dir]; y = ts.y + yincr[ts.dir]; if (POSSIBLE(x, y) && (hit = cpufire(x, y))) { ts.x = x; ts.y = y; ts.hits++; next = (hit == S_SUNK) ? RANDOM_FIRE : SECOND_PASS; break; } else next = RANDOM_FIRE; break; } / pause between shots in salvo / if (salvo) { (void) refresh(); (void) sleep(1); } #ifdef DEBUG MvPrintw(PROMPTLINE + 2, 0, "New state %d, x=%d, y=%d, d=%d", next, x, y, d); #endif / DEBUG / return ((hit) ? TRUE : FALSE); } static int playagain(void) { int j; ship_t ss; for (ss = cpuship; ss < cpuship + SHIPTYPES; ss++) for (j = 0; j < ss->length; j++) { cgoto(ss->y + j * yincr[ss->dir], ss->x + j * xincr[ss->dir]); (void) addch((chtype) ss->symbol); } if (awinna()) ++cpuwon; else ++plywon; j = 18 + (int) strlen(your_name); if (plywon >= 10) ++j; if (cpuwon >= 10) ++j; MvPrintw(1, (COLWIDTH - j) / 2, "%s: %d Computer: %d", your_name, plywon, cpuwon); prompt(2, (awinna())? "Want to be humiliated again, %s [yn]? " : "Going to give me a chance for revenge, %s [yn]? ", your_name); return (sgetc("YN") == 'Y'); } static void do_options(int c, char op[]) { register int i; if (c > 1) { for (i = 1; i < c; i++) { switch (op[i][0]) { default: case '?': (void) fprintf(stderr, "Usage: battle [-s \| -b] [-c]\n"); (void) fprintf(stderr, "\tWhere the options are:\n"); (void) fprintf(stderr, "\t-s : play a salvo game\n"); (void) fprintf(stderr, "\t-b : play a blitz game\n"); (void) fprintf(stderr, "\t-c : ships may be adjacent\n"); ExitProgram(EXIT_FAILURE); break; case '-': switch (op[i][1]) { case 'b': blitz = 1; if (salvo == 1) { (void) fprintf(stderr, "Bad Arg: -b and -s are mutually exclusive\n"); ExitProgram(EXIT_FAILURE); } break; case 's': salvo = 1; if (blitz == 1) { (void) fprintf(stderr, "Bad Arg: -s and -b are mutually exclusive\n"); ExitProgram(EXIT_FAILURE); } break; case 'c': closepack = 1; break; default: (void) fprintf(stderr, "Bad arg: type \"%s ?\" for usage message\n", op[0]); ExitProgram(EXIT_FAILURE); } } } } } static int scount(int who) { register int i, shots; register ship_t sp; if (who) sp = cpuship; /* count cpu shots / else sp = plyship; / count player shots / for (i = 0, shots = 0; i < SHIPTYPES; i++, sp++) { if (sp->hits >= sp->length) continue; / dead ship / else shots++; } return (shots); } int main(int argc, char argv[]) { setlocale(LC_ALL, ""); do_options(argc, argv); intro(); do { initgame(); while (awinna() == -1) { if (!blitz) { if (!salvo) { if (turn) (void) cputurn(); else (void) plyturn(); } else { register int i; i = scount(turn); while (i--) { if (turn) { if (cputurn() && awinna() != -1) i = 0; } else { if (plyturn() && awinna() != -1) i = 0; } } } } else while ((turn ? cputurn() : plyturn()) && awinna() == -1) continue; turn = OTHER; } } while (playagain()); uninitgame(0); /NOTREACHED / } /* bs.c ends here */

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