Annotation of src/games/tetris/screen.c, Revision 1.34
1.34 ! rillig 1: /* $NetBSD: screen.c,v 1.33 2017/03/20 22:05:27 christos Exp $ */
1.2 cgd 2:
1.1 cgd 3: /*-
4: * Copyright (c) 1992, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Chris Torek and Darren F. Provine.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
1.18 agc 18: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: *
34: * @(#)screen.c 8.1 (Berkeley) 5/31/93
35: */
36:
37: /*
38: * Tetris screen control.
39: */
40:
1.20 perry 41: #include <sys/cdefs.h>
1.1 cgd 42: #include <sys/ioctl.h>
43:
44: #include <setjmp.h>
45: #include <signal.h>
46: #include <stdio.h>
47: #include <stdlib.h>
48: #include <string.h>
1.26 roy 49: #include <term.h>
1.3 mycroft 50: #include <termios.h>
1.1 cgd 51: #include <unistd.h>
52:
53: #ifndef sigmask
54: #define sigmask(s) (1 << ((s) - 1))
55: #endif
56:
57: #include "screen.h"
58: #include "tetris.h"
59:
60: static cell curscreen[B_SIZE]; /* 1 => standout (or otherwise marked) */
61: static int curscore;
62: static int isset; /* true => terminal is in game mode */
1.3 mycroft 63: static struct termios oldtt;
1.19 jsm 64: static void (*tstp)(int);
1.1 cgd 65:
1.19 jsm 66: static void scr_stop(int);
1.21 perry 67: static void stopset(int) __dead;
1.1 cgd 68:
69:
70: /*
71: * Routine used by tputs().
72: */
1.13 lukem 73: int
1.23 dholland 74: put(int c)
1.1 cgd 75: {
76:
1.13 lukem 77: return (putchar(c));
1.1 cgd 78: }
79:
80: /*
81: * putstr() is for unpadded strings (either as in termcap(5) or
82: * simply literal strings); putpad() is for padded strings with
83: * count=1. (See screen.h for putpad().)
84: */
85: #define putstr(s) (void)fputs(s, stdout)
1.14 blymn 86:
1.24 dholland 87: static void
1.14 blymn 88: moveto(int r, int c)
89: {
1.26 roy 90: char *buf;
1.14 blymn 91:
1.27 roy 92: buf = tiparm(cursor_address, r, c);
1.26 roy 93: if (buf != NULL)
1.14 blymn 94: putpad(buf);
95: }
1.1 cgd 96:
1.28 christos 97: static void
98: setcolor(int c)
99: {
100: char *buf;
1.30 nat 101: char monochrome[] = "\033[0m";
1.29 pgoyette 102: if (nocolor == 1)
103: return;
1.28 christos 104: if (set_a_foreground == NULL)
105: return;
106:
1.30 nat 107: if (c == 0 || c == 7)
108: buf = monochrome;
109: else
110: buf = tiparm(set_a_foreground, c);
1.28 christos 111: if (buf != NULL)
112: putpad(buf);
113: }
114:
1.1 cgd 115: /*
116: * Set up from termcap.
117: */
118: void
1.23 dholland 119: scr_init(void)
1.1 cgd 120: {
121:
1.26 roy 122: setupterm(NULL, 0, NULL);
123: if (clear_screen == NULL)
1.1 cgd 124: stop("cannot clear screen");
1.26 roy 125: if (cursor_address == NULL || cursor_up == NULL)
126: stop("cannot do random cursor positioning");
1.1 cgd 127: }
128:
129: /* this foolery is needed to modify tty state `atomically' */
130: static jmp_buf scr_onstop;
131:
132: static void
1.23 dholland 133: stopset(int sig)
1.1 cgd 134: {
1.22 dholland 135: sigset_t set;
1.3 mycroft 136:
1.1 cgd 137: (void) signal(sig, SIG_DFL);
138: (void) kill(getpid(), sig);
1.22 dholland 139: sigemptyset(&set);
140: sigaddset(&set, sig);
141: (void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0);
1.1 cgd 142: longjmp(scr_onstop, 1);
143: }
144:
145: static void
1.23 dholland 146: scr_stop(int sig)
1.1 cgd 147: {
1.22 dholland 148: sigset_t set;
1.3 mycroft 149:
1.1 cgd 150: scr_end();
1.3 mycroft 151: (void) kill(getpid(), sig);
1.22 dholland 152: sigemptyset(&set);
153: sigaddset(&set, sig);
154: (void) sigprocmask(SIG_UNBLOCK, &set, (sigset_t *)0);
1.1 cgd 155: scr_set();
156: scr_msg(key_msg, 1);
157: }
158:
159: /*
160: * Set up screen mode.
161: */
162: void
1.23 dholland 163: scr_set(void)
1.1 cgd 164: {
165: struct winsize ws;
1.3 mycroft 166: struct termios newtt;
1.22 dholland 167: sigset_t nsigset, osigset;
1.19 jsm 168: void (*ttou)(int);
1.1 cgd 169:
1.22 dholland 170: sigemptyset(&nsigset);
171: sigaddset(&nsigset, SIGTSTP);
172: sigaddset(&nsigset, SIGTTOU);
173: (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
1.1 cgd 174: if ((tstp = signal(SIGTSTP, stopset)) == SIG_IGN)
175: (void) signal(SIGTSTP, SIG_IGN);
1.3 mycroft 176: if ((ttou = signal(SIGTTOU, stopset)) == SIG_IGN)
177: (void) signal(SIGTTOU, SIG_IGN);
1.1 cgd 178: /*
179: * At last, we are ready to modify the tty state. If
180: * we stop while at it, stopset() above will longjmp back
181: * to the setjmp here and we will start over.
182: */
183: (void) setjmp(scr_onstop);
1.3 mycroft 184: (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
1.1 cgd 185: Rows = 0, Cols = 0;
186: if (ioctl(0, TIOCGWINSZ, &ws) == 0) {
187: Rows = ws.ws_row;
188: Cols = ws.ws_col;
189: }
190: if (Rows == 0)
1.26 roy 191: Rows = lines;
1.1 cgd 192: if (Cols == 0)
1.26 roy 193: Cols = columns;
1.1 cgd 194: if (Rows < MINROWS || Cols < MINCOLS) {
195: (void) fprintf(stderr,
1.8 hubertf 196: "the screen is too small: must be at least %dx%d, ",
197: MINCOLS, MINROWS);
1.1 cgd 198: stop(""); /* stop() supplies \n */
199: }
1.32 nat 200: Offset = (Rows - D_LAST + D_FIRST - 2) / 2;
1.3 mycroft 201: if (tcgetattr(0, &oldtt) < 0)
202: stop("tcgetattr() fails");
1.1 cgd 203: newtt = oldtt;
1.3 mycroft 204: newtt.c_lflag &= ~(ICANON|ECHO);
205: newtt.c_oflag &= ~OXTABS;
206: if (tcsetattr(0, TCSADRAIN, &newtt) < 0)
207: stop("tcsetattr() fails");
208: ospeed = cfgetospeed(&newtt);
1.22 dholland 209: (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
1.1 cgd 210:
211: /*
212: * We made it. We are now in screen mode, modulo TIstr
213: * (which we will fix immediately).
214: */
1.33 christos 215: const char *tstr;
216: if ((tstr = enter_ca_mode) != NULL)
217: putstr(tstr);
218: if ((tstr = cursor_invisible) != NULL)
219: putstr(tstr);
1.1 cgd 220: if (tstp != SIG_IGN)
221: (void) signal(SIGTSTP, scr_stop);
1.3 mycroft 222: if (ttou != SIG_IGN)
223: (void) signal(SIGTTOU, ttou);
1.1 cgd 224:
225: isset = 1;
1.3 mycroft 226: (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
1.1 cgd 227: scr_clear();
228: }
229:
230: /*
231: * End screen mode.
232: */
233: void
1.23 dholland 234: scr_end(void)
1.1 cgd 235: {
1.22 dholland 236: sigset_t nsigset, osigset;
1.1 cgd 237:
1.22 dholland 238: sigemptyset(&nsigset);
239: sigaddset(&nsigset, SIGTSTP);
240: sigaddset(&nsigset, SIGTTOU);
241: (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
1.1 cgd 242: /* move cursor to last line */
1.33 christos 243: const char *tstr;
244: if ((tstr = cursor_to_ll) != NULL)
245: putstr(tstr);
1.1 cgd 246: else
247: moveto(Rows - 1, 0);
248: /* exit screen mode */
1.33 christos 249: if ((tstr = exit_ca_mode) != NULL)
250: putstr(tstr);
251: if ((tstr = cursor_normal) != NULL)
252: putstr(tstr);
1.1 cgd 253: (void) fflush(stdout);
1.3 mycroft 254: (void) tcsetattr(0, TCSADRAIN, &oldtt);
1.1 cgd 255: isset = 0;
256: /* restore signals */
257: (void) signal(SIGTSTP, tstp);
1.3 mycroft 258: (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
1.1 cgd 259: }
260:
261: void
1.23 dholland 262: stop(const char *why)
1.1 cgd 263: {
264:
265: if (isset)
266: scr_end();
267: (void) fprintf(stderr, "aborting: %s\n", why);
268: exit(1);
269: }
270:
271: /*
272: * Clear the screen, forgetting the current contents in the process.
273: */
274: void
1.23 dholland 275: scr_clear(void)
1.1 cgd 276: {
277:
1.26 roy 278: putpad(clear_screen);
1.1 cgd 279: curscore = -1;
1.7 perry 280: memset((char *)curscreen, 0, sizeof(curscreen));
1.1 cgd 281: }
282:
283: #if vax && !__GNUC__
284: typedef int regcell; /* pcc is bad at `register char', etc */
285: #else
286: typedef cell regcell;
287: #endif
288:
289: /*
290: * Update the screen.
291: */
292: void
1.23 dholland 293: scr_update(void)
1.1 cgd 294: {
1.17 wiz 295: cell *bp, *sp;
296: regcell so, cur_so = 0;
297: int i, ccol, j;
1.22 dholland 298: sigset_t nsigset, osigset;
1.11 jsm 299: static const struct shape *lastshape;
1.3 mycroft 300:
1.22 dholland 301: sigemptyset(&nsigset);
302: sigaddset(&nsigset, SIGTSTP);
303: (void) sigprocmask(SIG_BLOCK, &nsigset, &osigset);
1.1 cgd 304:
305: /* always leave cursor after last displayed point */
306: curscreen[D_LAST * B_COLS - 1] = -1;
307:
308: if (score != curscore) {
1.26 roy 309: if (cursor_home)
310: putpad(cursor_home);
1.1 cgd 311: else
312: moveto(0, 0);
1.30 nat 313: setcolor(0);
1.8 hubertf 314: (void) printf("Score: %d", score);
1.1 cgd 315: curscore = score;
316: }
317:
1.8 hubertf 318: /* draw preview of nextpattern */
1.9 hubertf 319: if (showpreview && (nextshape != lastshape)) {
1.8 hubertf 320: static int r=5, c=2;
1.34 ! rillig 321: int tr, tc, t;
1.8 hubertf 322:
323: lastshape = nextshape;
1.34 ! rillig 324:
1.8 hubertf 325: /* clean */
1.26 roy 326: putpad(exit_standout_mode);
1.8 hubertf 327: moveto(r-1, c-1); putstr(" ");
328: moveto(r, c-1); putstr(" ");
329: moveto(r+1, c-1); putstr(" ");
330: moveto(r+2, c-1); putstr(" ");
331:
332: moveto(r-3, c-2);
333: putstr("Next shape:");
1.34 ! rillig 334:
1.8 hubertf 335: /* draw */
1.31 christos 336: setcolor(nextshape->color);
1.26 roy 337: putpad(enter_standout_mode);
1.8 hubertf 338: moveto(r, 2*c);
339: putstr(" ");
340: for(i=0; i<3; i++) {
341: t = c + r*B_COLS;
342: t += nextshape->off[i];
343:
344: tr = t / B_COLS;
345: tc = t % B_COLS;
346:
347: moveto(tr, 2*tc);
348: putstr(" ");
349: }
1.26 roy 350: putpad(exit_standout_mode);
1.8 hubertf 351: }
1.34 ! rillig 352:
1.1 cgd 353: bp = &board[D_FIRST * B_COLS];
354: sp = &curscreen[D_FIRST * B_COLS];
355: for (j = D_FIRST; j < D_LAST; j++) {
356: ccol = -1;
357: for (i = 0; i < B_COLS; bp++, sp++, i++) {
358: if (*sp == (so = *bp))
359: continue;
360: *sp = so;
361: if (i != ccol) {
1.26 roy 362: if (cur_so && move_standout_mode) {
363: putpad(exit_standout_mode);
1.1 cgd 364: cur_so = 0;
365: }
1.32 nat 366: moveto(RTOD(j + Offset), CTOD(i));
1.1 cgd 367: }
1.26 roy 368: if (enter_standout_mode) {
1.1 cgd 369: if (so != cur_so) {
1.30 nat 370: setcolor(so);
1.26 roy 371: putpad(so ?
372: enter_standout_mode :
373: exit_standout_mode);
1.1 cgd 374: cur_so = so;
375: }
1.28 christos 376: #ifdef DEBUG
377: char buf[3];
378: snprintf(buf, sizeof(buf), "%d%d", so, so);
379: putstr(buf);
380: #else
1.1 cgd 381: putstr(" ");
1.28 christos 382: #endif
1.1 cgd 383: } else
384: putstr(so ? "XX" : " ");
385: ccol = i + 1;
386: /*
387: * Look ahead a bit, to avoid extra motion if
388: * we will be redrawing the cell after the next.
389: * Motion probably takes four or more characters,
390: * so we save even if we rewrite two cells
391: * `unnecessarily'. Skip it all, though, if
392: * the next cell is a different color.
393: */
394: #define STOP (B_COLS - 3)
395: if (i > STOP || sp[1] != bp[1] || so != bp[1])
396: continue;
397: if (sp[2] != bp[2])
398: sp[1] = -1;
399: else if (i < STOP && so == bp[2] && sp[3] != bp[3]) {
400: sp[2] = -1;
401: sp[1] = -1;
402: }
403: }
404: }
405: if (cur_so)
1.26 roy 406: putpad(exit_standout_mode);
1.1 cgd 407: (void) fflush(stdout);
1.3 mycroft 408: (void) sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
1.1 cgd 409: }
410:
411: /*
412: * Write a message (set!=0), or clear the same message (set==0).
413: * (We need its length in case we have to overwrite with blanks.)
414: */
415: void
1.23 dholland 416: scr_msg(char *s, int set)
1.1 cgd 417: {
1.34 ! rillig 418:
1.26 roy 419: if (set || clr_eol == NULL) {
1.17 wiz 420: int l = strlen(s);
1.1 cgd 421:
422: moveto(Rows - 2, ((Cols - l) >> 1) - 1);
423: if (set)
424: putstr(s);
425: else
426: while (--l >= 0)
427: (void) putchar(' ');
428: } else {
429: moveto(Rows - 2, 0);
1.26 roy 430: putpad(clr_eol);
1.1 cgd 431: }
432: }
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