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git.gir.st - VIper.git/blob - viiper.c
1 /*******************************************************************************
3 By Tobias Girstmair, 2018
6 (see ./viiper -h for full list of options)
8 KEYBINDINGS: - hjkl to move
9 - p to pause and resume
12 - (see `./minesviiper -h' for all keybindings)
14 GNU GPL v3, see LICENSE or https://www.gnu.org/licenses/gpl-3.0.txt
15 *******************************************************************************/
18 #define _POSIX_C_SOURCE 2 /*for getopt and sigaction in c99, sigsetjmp*/
23 #include <sys/ioctl.h>
32 #define MIN(a,b) (a>b?b:a)
33 #define MAX(a,b) (a>b?a:b)
34 #define CLAMP(a,m,M) (a<m?m:(a>M?M:a))
35 #define printm(n, s) for (int _loop = 0; _loop < n; _loop++) fputs (s, stdout)
36 #define print(str) fputs (str?str:"", stdout)
39 #define OPPOSITE(dir) ( \
40 dir == EAST ? WEST : \
41 dir == WEST ? EAST : \
42 dir == NORTH ? SOUTH : \
43 dir == SOUTH ? NORTH : -1)
48 #define CW op.scheme->cell_width
51 int w
; /* field width */
52 int h
; /* field height */
53 int d
; /* direction the snake is looking */
54 int t
; /* time of game start */
56 float v
; /* velocity in moves per second */
57 struct snake
* s
; /* snek */
58 struct item
* i
; /* items (food, boni) */
59 struct directions
* n
;/* next direction events to process */
63 int l
; /* initial snake length */
64 int s
; /* initial snake speed */
65 struct scheme
* scheme
;
70 int main (int argc
, char** argv
) {
72 g
.w
= 30; //two-char-width
79 opterr
= 0; /* don't print message on unrecognized option */
80 while ((optget
= getopt (argc
, argv
, "+s:dh")) != -1) {
85 fprintf (stderr
, SHORTHELP
"speed must be >= 1\n", argv
[0]);
89 case 'd': op
.scheme
= &vt220_charset
; break;
92 fprintf (stderr
, SHORTHELP LONGHELP
, argv
[0]);
93 return !(optget
=='h');
95 } if (optind
< argc
) { /* parse Fieldspec */
96 int n
= sscanf (argv
[optind
], "%dx%d", &g
.w
, &g
.h
);
99 fprintf (stderr
, SHORTHELP
"FIELDSIZE is WxH (width 'x' height)\n", argv
[0]);
111 if (sigsetjmp(game_over
, 1)) {
113 move_ph (g
.h
/2+LINE_OFFSET
, g
.w
);
114 printf ("snek ded :(");
120 //TODO: call viiper() in a game loop
135 spawn_item(FOOD
, rand() % NUM_FOODS
, NULL
); //TODO: shape distribution, so bigger values get selected less
138 switch (getctrlseq()) {
139 case CTRSEQ_CURSOR_LEFT
: case 'h':append_movement(WEST
); break;
140 case CTRSEQ_CURSOR_DOWN
: case 'j':append_movement(SOUTH
); break;
141 case CTRSEQ_CURSOR_UP
: case 'k':append_movement(NORTH
); break;
142 case CTRSEQ_CURSOR_RIGHT
:case 'l':append_movement(EAST
); break;
145 move_ph (g
.h
/2+LINE_OFFSET
, g
.w
*CW
/2);
146 printf ("\033[5mPAUSE\033[0m"); /* blinking text */
147 if (getchar() == 'q') exit(0);
151 case 'r': /*TODO:restart*/ return 0;
157 case 0x02: /* STX; gets sent when returning from SIGALRM */
164 void snake_advance (void) {
165 if (g
.n
) {/* new direction in the buffer */
166 int possible_new_dir
= get_movement();
167 if (g
.d
!= OPPOSITE(possible_new_dir
))
168 g
.d
= possible_new_dir
;
171 int new_row
= g
.s
->r
+(g
.d
==SOUTH
) -(g
.d
==NORTH
);
172 int new_col
= g
.s
->c
+(g
.d
==EAST
) -(g
.d
==WEST
);
174 /* detect food hit and spawn a new food */
175 for (struct item
* i
= g
.i
; i
; i
= i
->next
) {
176 if (i
->r
== new_row
&& i
->c
== new_col
) {
178 spawn_item(FOOD
, rand() % NUM_FOODS
, i
);
182 /* NOTE: we are drawing the snake 1 column too far to the left, so it
183 can directly touch the vertical walls. this also means that we essen-
184 tially extend the width by 1 cell, so we need to check against g.w+1. */
185 if (new_row
>= g
.h
|| new_col
>= g
.w
+1 || new_row
< 0 || new_col
< 0)
186 siglongjmp(game_over
, 1/*<-will be the retval of setjmp*/);
188 struct snake
* new_head
;
189 struct snake
* new_tail
; /* former second-to-last element */
190 for (new_tail
= g
.s
; new_tail
->next
->next
; new_tail
= new_tail
->next
)
191 /* use the opportunity of looping to check if we eat ourselves*/
192 if(new_tail
->next
->r
== new_row
&& new_tail
->next
->c
== new_col
)
193 siglongjmp(game_over
, 1/*<-will be the retval of setjmp*/);
194 int old_tail
[2] = {new_tail
->next
->r
, new_tail
->next
->c
}; /* save it for erasing */
195 new_head
= new_tail
->next
; /* reuse element instead of malloc() */
196 new_tail
->next
= NULL
;
198 new_head
->r
= new_row
;
199 new_head
->c
= new_col
;
200 new_head
->next
= g
.s
;
204 draw_sprites (old_tail
[0], old_tail
[1]);
207 void spawn_item (int type
, int value
, struct item
* p_item
) {
212 /* loop through snake to check if we aren't on it */
213 //WARN: inefficient as snake gets longer; near impossible in the end
214 for (struct snake
* s
= g
.s
; s
; s
= s
->next
)
215 if (s
->r
== row
&& s
->c
== col
) goto try_again
; //TODO: appears to not work all the time
217 struct item
* new_item
;
218 if (p_item
) new_item
= p_item
;
219 else new_item
= malloc (sizeof(struct item
));
225 new_item
->s
= time(0);
226 if (g
.i
) g
.i
->prev
= new_item
;
227 new_item
->next
= g
.i
;
228 new_item
->prev
= NULL
;
233 void consume_item (struct item
* i
) {
237 case FOOD_5
: g
.p
+= 5; break;
238 case FOOD_10
: g
.p
+= 10; break;
239 case FOOD_20
: g
.p
+= 20; break;
241 snake_append(&g
.s
, 0,0); /* position doesn't matter, as item */
242 break; /* will be reused as the head before it is drawn */
248 if (i
->next
) i
->next
->prev
= i
->prev
;
249 if (i
->prev
) i
->prev
->next
= i
->next
;
253 void show_playfield (void) {
258 printm (g
.w
, BORDER(T
,C
));
259 printf ("%s\n", BORDER(T
,R
));
262 for (int row
= 0; row
< g
.h
; row
++)
263 printf ("%s%*s%s\n", BORDER(C
,L
), CW
*g
.w
, "", BORDER(C
,R
));
267 printm (g
.w
, BORDER(B
,C
));
273 void draw_sprites (int erase_r
, int erase_c
) {
275 move_ph (erase_r
+LINE_OFFSET
, erase_c
*CW
+COL_OFFSET
);
279 struct snake
* last
= NULL
;
281 for (struct snake
* s
= g
.s
; s
; s
= s
->next
) {
282 move_ph (s
->r
+LINE_OFFSET
, s
->c
*CW
+COL_OFFSET
); /*NOTE: all those are actually wrong; draws snake 1 col too far left*/
284 int predecessor
= (last
==NULL
)?NONE
:
285 (last
->r
< s
->r
) ? NORTH
:
286 (last
->r
> s
->r
) ? SOUTH
:
287 (last
->c
> s
->c
) ? EAST
:
288 (last
->c
< s
->c
) ? WEST
:NONE
;
289 int successor
= (s
->next
== NULL
)?NONE
:
290 (s
->next
->r
< s
->r
) ? NORTH
:
291 (s
->next
->r
> s
->r
) ? SOUTH
:
292 (s
->next
->c
> s
->c
) ? EAST
:
293 (s
->next
->c
< s
->c
) ? WEST
:NONE
;
295 printf ("\033[%sm", op
.scheme
->color
[color
]);
296 print (op
.scheme
->snake
[predecessor
][successor
]);
302 /* print item queue */
303 for (struct item
* i
= g
.i
; i
; i
= i
->next
) {
304 move_ph (i
->r
+LINE_OFFSET
, i
->c
*CW
+COL_OFFSET
);
305 if (i
->t
== FOOD
) print (op
.scheme
->item
[i
->v
]);
306 else if (i
->t
==BONUS
) /* TODO: print bonus */;
310 int score_width
= g
.p
> 9999?6:4;
311 move_ph (0, (g
.w
*CW
-score_width
)/2);
312 printf ("%s %0*d %s", BORDER(S
,L
), score_width
, g
.p
, BORDER(S
,R
));
315 void snake_append (struct snake
** s
, int row
, int col
) {
316 struct snake
* new = malloc (sizeof(struct snake
));
322 struct snake
* p
= *s
;
323 while (p
->next
) p
= p
->next
;
331 for (int i
= 0; i
< op
.l
; i
++) {
332 if (g
.w
/2-i
< 0) /* go upwards if we hit left wall */
333 snake_append(&g
.s
, g
.h
/2-(i
-g
.w
/2), 0);
334 else /* normally just keep goint left */
335 snake_append(&g
.s
, g
.h
/2, g
.w
/2-i
);
339 #define free_ll(head) do{ \
360 int getctrlseq (void) {
363 while ((c
= getchar()) != EOF
) {
367 case '\033': state
=ESC_SENT
; break;
373 case '[': state
=CSI_SENT
; break;
374 default: return CTRSEQ_INVALID
;
379 case 'A': return CTRSEQ_CURSOR_UP
;
380 case 'B': return CTRSEQ_CURSOR_DOWN
;
381 case 'C': return CTRSEQ_CURSOR_RIGHT
;
382 case 'D': return CTRSEQ_CURSOR_LEFT
;
383 default: return CTRSEQ_INVALID
;
387 return CTRSEQ_INVALID
;
393 void append_movement (int dir
) {
394 struct directions
* n
;
395 for (n
= g
.n
; n
&& n
->next
; n
= n
->next
); /* advance to the end */
396 if (n
&& n
->d
== dir
) return; /* don't add the same direction twice */
397 if (n
&& n
->d
== OPPOSITE(dir
)) return; /* don't add impossible dir. */
399 struct directions
* new_event
= malloc (sizeof(struct directions
));
401 new_event
->next
= NULL
;
409 int get_movement (void) {
410 if (g
.n
== NULL
) return -1;
413 struct directions
* delet_this
= g
.n
;
419 void move_ph (int line
, int col
) {
420 /* move printhead to zero-indexed position */
421 printf ("\033[%d;%dH", line
+1, col
+1);
424 void clamp_fieldsize (void) {
425 /* clamp field size to terminal size and mouse maximum: */
427 ioctl(STDOUT_FILENO
, TIOCGWINSZ
, &w
);
429 if (g
.w
< 10) g
.w
= 10;
430 if (g
.h
< 10) g
.h
= 10;
432 if (COL_OFFSET
+ g
.w
*CW
+ COL_OFFSET
> w
.ws_col
)
433 g
.w
= (w
.ws_col
- COL_OFFSET
- COL_OFFSET
)/CW
-1; //TODO: does not work in `-d' (in xterm)
434 if (LINE_OFFSET
+ g
.h
+ LINES_AFTER
> w
.ws_row
)
435 g
.h
= w
.ws_row
- (LINE_OFFSET
+LINES_AFTER
);
438 void timer_setup (int enable
) {
439 static struct itimerval tbuf
;
440 tbuf
.it_interval
.tv_sec
= 0;//TODO: make it speed up automatically
441 tbuf
.it_interval
.tv_usec
= (1000000/g
.v
)-1; /*WARN: 1 <= g.v <= 999999*/
444 tbuf
.it_value
.tv_sec
= tbuf
.it_interval
.tv_sec
;
445 tbuf
.it_value
.tv_usec
= tbuf
.it_interval
.tv_usec
;
447 tbuf
.it_value
.tv_sec
= 0;
448 tbuf
.it_value
.tv_usec
= 0;
451 if ( setitimer(ITIMER_REAL
, &tbuf
, NULL
) == -1 ) {
458 void signal_setup (void) {
459 struct sigaction saction
;
461 saction
.sa_handler
= signal_handler
;
462 sigemptyset(&saction
.sa_mask
);
463 saction
.sa_flags
= 0;
464 if (sigaction(SIGALRM
, &saction
, NULL
) < 0 ) {
469 if (sigaction(SIGINT
, &saction
, NULL
) < 0 ) {
475 void signal_handler (int signum
) {
485 void screen_setup (int enable
) {
488 printf ("\033[s\033[?47h"); /* save cursor, alternate screen */
489 printf ("\033[H\033[J"); /* reset cursor, clear screen */
490 printf ("\033[?25l"); /* hide cursor */
491 print (op
.scheme
->init_seq
); /* swich charset, if necessary */
493 print (op
.scheme
->reset_seq
); /* reset charset, if necessary */
494 printf ("\033[?25h"); /* show cursor */
495 printf ("\033[?47l\033[u"); /* primary screen, restore cursor */
500 /* http://users.csc.calpoly.edu/~phatalsk/357/lectures/code/sigalrm.c */
501 void raw_mode(int enable
) {
502 static struct termios saved_term_mode
;
503 struct termios raw_term_mode
;
506 tcgetattr(STDIN_FILENO
, &saved_term_mode
);
507 raw_term_mode
= saved_term_mode
;
508 raw_term_mode
.c_lflag
&= ~(ICANON
| ECHO
);
509 raw_term_mode
.c_cc
[VMIN
] = 1 ;
510 raw_term_mode
.c_cc
[VTIME
] = 0;
511 tcsetattr(STDIN_FILENO
, TCSAFLUSH
, &raw_term_mode
);
513 tcsetattr(STDIN_FILENO
, TCSAFLUSH
, &saved_term_mode
);