| 1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *\ |
| 2 | * This is GNU Go, a Go program. Contact gnugo@gnu.org, or see * |
| 3 | * http://www.gnu.org/software/gnugo/ for more information. * |
| 4 | * * |
| 5 | * Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, * |
| 6 | * 2008 and 2009 by the Free Software Foundation. * |
| 7 | * * |
| 8 | * This program is free software; you can redistribute it and/or * |
| 9 | * modify it under the terms of the GNU General Public License as * |
| 10 | * published by the Free Software Foundation - version 3 * |
| 11 | * or (at your option) any later version. * |
| 12 | * * |
| 13 | * This program is distributed in the hope that it will be useful, * |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
| 16 | * GNU General Public License in file COPYING for more details. * |
| 17 | * * |
| 18 | * You should have received a copy of the GNU General Public * |
| 19 | * License along with this program; if not, write to the Free * |
| 20 | * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, * |
| 21 | * Boston, MA 02111, USA. * |
| 22 | \* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
| 23 | |
| 24 | /* |
| 25 | * This program sits between a GTP client and a GTP engine, |
| 26 | * passing commands back and forth and modifying them in |
| 27 | * some cases. |
| 28 | * |
| 29 | * To the client it appears to be a GTP engine. |
| 30 | * |
| 31 | * stdin pipe a |
| 32 | * GTP client ----> metamachine -----> GTP engine |
| 33 | * <---- <----- |
| 34 | * stdout pipe b |
| 35 | * |
| 36 | * Most commands are passed verbatim to the engine. The |
| 37 | * exception is gg_genmove, which is intercepted then |
| 38 | * processed differently. The top two moves are both |
| 39 | * tried, the position evaluated by estimate_score, |
| 40 | * and the move yielding the higher score is selected. |
| 41 | * |
| 42 | * Usage: no arguments gives normal GTP behavior. |
| 43 | * 'metamachine --debug' sends diagnostics to stderr. */ |
| 44 | |
| 45 | #include <stdio.h> |
| 46 | #include <unistd.h> |
| 47 | #include <stdarg.h> |
| 48 | #include <string.h> |
| 49 | #include <ctype.h> |
| 50 | |
| 51 | void error(const char *msg); |
| 52 | void gprintf(FILE *outputfile, const char *fmt, ...); |
| 53 | void trace(const char *fmt, ...); |
| 54 | void tell_gnugo(char *gnugo_line, const char *msg); |
| 55 | |
| 56 | int boardsize = 19; |
| 57 | char delimiters[] = " \t\r\n"; |
| 58 | char gnugo_line[128], client_line[128]; |
| 59 | FILE *to_gnugo_stream, *from_gnugo_stream; |
| 60 | |
| 61 | int debug = 0; |
| 62 | |
| 63 | #define EMPTY 0 |
| 64 | #define WHITE 1 |
| 65 | #define BLACK 2 |
| 66 | |
| 67 | #define GTP_BUFSIZE 1000 |
| 68 | |
| 69 | void ask_gnugo(char *line, int verbose, const char *msg); |
| 70 | |
| 71 | int |
| 72 | main(int argc, char *const *argv) |
| 73 | { |
| 74 | int pfd_a[2]; |
| 75 | int pfd_b[2]; |
| 76 | int id; |
| 77 | int k; |
| 78 | char command[GTP_BUFSIZE]; |
| 79 | |
| 80 | for (k = 1; k < argc; k++) |
| 81 | if (argc > 1 && strstr(argv[k], "debug")) |
| 82 | debug = 1; |
| 83 | if (pipe(pfd_a) == -1) |
| 84 | error("can't open pipe a"); |
| 85 | if (pipe(pfd_b) == -1) |
| 86 | error("can't open pipe b"); |
| 87 | switch (fork()) { |
| 88 | case -1: |
| 89 | error("fork failed (try chopsticks)"); |
| 90 | case 0: |
| 91 | /* Attach pipe a to stdin */ |
| 92 | if (dup2(pfd_a[0], 0) == -1) |
| 93 | error("dup pfd_a[0] failed"); |
| 94 | /* attach pipe b to stdout" */ |
| 95 | if (dup2(pfd_b[1], 1) == -1) |
| 96 | error("dup pfd_b[1] failed"); |
| 97 | execlp("gnugo", "gnugo", "--mode", "gtp", "--quiet", NULL); |
| 98 | error("execlp failed"); |
| 99 | } |
| 100 | /* Attach pipe a to to_gnugo_stream */ |
| 101 | to_gnugo_stream = fdopen(pfd_a[1], "w"); |
| 102 | /* Attach pipe b to from_gnugo_stream */ |
| 103 | from_gnugo_stream = fdopen(pfd_b[0], "r"); |
| 104 | |
| 105 | while (1) { |
| 106 | char *p; |
| 107 | int n; |
| 108 | |
| 109 | if (!fgets(client_line, GTP_BUFSIZE, stdin) |
| 110 | || (strstr(client_line, "quit") == client_line)) { |
| 111 | tell_gnugo("quit\n", "a"); |
| 112 | return 1; |
| 113 | } |
| 114 | |
| 115 | /* remove comments */ |
| 116 | if ((p = strchr(client_line, '#')) != NULL) |
| 117 | *p = 0; |
| 118 | |
| 119 | p = client_line; |
| 120 | |
| 121 | /* Look for an identification number. */ |
| 122 | if (sscanf(p, "%d%n", &id, &n) == 1) |
| 123 | p += n; |
| 124 | else |
| 125 | id = -1; /* No identification number. */ |
| 126 | trace("id = %d\n", id); |
| 127 | |
| 128 | /* Look for command name. */ |
| 129 | if (sscanf(p, " %s %n", command, &n) < 1) |
| 130 | continue; /* Whitespace only on this line, ignore. */ |
| 131 | p += n; |
| 132 | trace("command: %s\n", command); |
| 133 | |
| 134 | if (!strncmp(command, "boardsize", 9)) { |
| 135 | char *token; |
| 136 | tell_gnugo(client_line, "b"); |
| 137 | ask_gnugo(gnugo_line, 1, "1"); |
| 138 | |
| 139 | token = strtok(client_line, delimiters); |
| 140 | token = strtok(NULL, delimiters); |
| 141 | boardsize = atoi(token); |
| 142 | } |
| 143 | else if (!strncmp(command, "gg_genmove", 10)) { |
| 144 | int move_i[10], move_j[10]; |
| 145 | float move_value[10], position_value[10]; |
| 146 | int moves_considered; |
| 147 | int k; |
| 148 | char *token; |
| 149 | int line_length = 0; |
| 150 | int color; |
| 151 | |
| 152 | if (strstr(client_line, "black")) |
| 153 | color = BLACK; |
| 154 | else if (strstr(client_line, "white")) |
| 155 | color = WHITE; |
| 156 | else { |
| 157 | color = EMPTY; |
| 158 | printf("?\n\n"); |
| 159 | } |
| 160 | |
| 161 | if (color == BLACK) |
| 162 | tell_gnugo("top_moves_black\n", "c"); |
| 163 | else |
| 164 | tell_gnugo("top_moves_white\n", "d"); |
| 165 | |
| 166 | ask_gnugo(gnugo_line, 0, "2"); |
| 167 | token = strtok(gnugo_line, delimiters); |
| 168 | for (k = 0; k < 10; k++) { |
| 169 | move_i[k] = -1; |
| 170 | move_j[k] = -1; |
| 171 | move_value[k] = 0.0; |
| 172 | } |
| 173 | for (k = 0; k < 10; k++) { |
| 174 | token = strtok(NULL, delimiters); |
| 175 | if (!token) |
| 176 | break; |
| 177 | string_to_location(boardsize, token, move_i+k, move_j+k); |
| 178 | token = strtok(NULL, delimiters); |
| 179 | if (!token) |
| 180 | break; |
| 181 | sscanf(token, "%f", move_value+k); |
| 182 | trace("move %d: %m valued %f\n", k, |
| 183 | move_i[k], move_j[k], move_value[k]); |
| 184 | } |
| 185 | moves_considered = k; |
| 186 | if (debug) |
| 187 | fprintf(stderr, "moves considered: %d\n", |
| 188 | moves_considered); |
| 189 | for (k = 0; k < 2 && k < moves_considered; k++) { |
| 190 | float upper, lower; |
| 191 | int n; |
| 192 | |
| 193 | trace("%s %m\n", color == BLACK ? "black" : "white", |
| 194 | move_i[k], move_j[k]); |
| 195 | gprintf(to_gnugo_stream, "%s %m\n", color == BLACK ? "black" : "white", |
| 196 | move_i[k], move_j[k]); |
| 197 | fflush(to_gnugo_stream); |
| 198 | ask_gnugo(gnugo_line, 0, "3"); |
| 199 | tell_gnugo("estimate_score\n", "e"); |
| 200 | ask_gnugo(gnugo_line, 0, "4"); |
| 201 | strtok(gnugo_line, "()\n"); |
| 202 | token = strtok(NULL, "()\n"); |
| 203 | trace("%s\n", token); |
| 204 | sscanf(token, "upper bound: %f, lower: %f%n", |
| 205 | &upper, &lower, &n); |
| 206 | if (n < 2) |
| 207 | error("can't read territory"); |
| 208 | trace("upper %f, lower %f\n", upper, lower); |
| 209 | tell_gnugo("undo\n", "f"); |
| 210 | ask_gnugo(gnugo_line, 0, "5"); |
| 211 | fflush(stdout); |
| 212 | if (color == BLACK) |
| 213 | position_value[k] = - upper; |
| 214 | else |
| 215 | position_value[k] = lower; |
| 216 | trace("position value %f\n", position_value[k]); |
| 217 | } |
| 218 | if (moves_considered == 0) { |
| 219 | if (id == -1) |
| 220 | gprintf(stdout, "= PASS\n\n"); |
| 221 | else |
| 222 | gprintf(stdout, "=%d PASS\n\n", id); |
| 223 | fflush(stdout); |
| 224 | } |
| 225 | else if (moves_considered == 1 |
| 226 | || position_value[0] > position_value[1]) { |
| 227 | gprintf(to_gnugo_stream, "%s %m\n", color == BLACK ? "black" : "white", |
| 228 | move_i[0], move_j[0]); |
| 229 | ask_gnugo(gnugo_line, 0, "6"); |
| 230 | if (id == -1) |
| 231 | gprintf(stdout, "= %m\n\n", move_i[0], move_j[0]); |
| 232 | else |
| 233 | gprintf(stdout, "=%d %m\n\n", id, move_i[0], move_j[0]); |
| 234 | fflush(stdout); |
| 235 | } |
| 236 | else { |
| 237 | gprintf(to_gnugo_stream, "%s %m\n", color == BLACK ? "black" : "white", |
| 238 | move_i[1], move_j[1]); |
| 239 | ask_gnugo(gnugo_line, 0, "7"); |
| 240 | if (id == -1) |
| 241 | gprintf(stdout, "= %m\n\n", move_i[1], move_j[1]); |
| 242 | else |
| 243 | gprintf(stdout, "=%d %m\n\n", id, move_i[1], move_j[1]); |
| 244 | fflush(stdout); |
| 245 | } |
| 246 | } |
| 247 | else { |
| 248 | tell_gnugo(client_line, "g"); |
| 249 | ask_gnugo(gnugo_line, 1, "8"); |
| 250 | } |
| 251 | /* loadsgf commands could change the boardsize, so we get |
| 252 | * it from the engine, after the command is run. */ |
| 253 | if (!strncmp(command, "loadsgf", 7)) { |
| 254 | tell_gnugo("query_boardsize\n", "i"); |
| 255 | ask_gnugo(gnugo_line, 0, "10"); |
| 256 | if (!sscanf(gnugo_line, "= %d", &boardsize)) |
| 257 | error("can't get boardsize"); |
| 258 | trace("setting boardsize %d\n", boardsize); |
| 259 | fflush(stderr); |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | |
| 265 | /* bark and barf */ |
| 266 | |
| 267 | void |
| 268 | error(const char *msg) |
| 269 | { |
| 270 | fprintf(stderr, "metamachine: %s\n", msg); |
| 271 | tell_gnugo("quit\n", msg); |
| 272 | abort(); |
| 273 | } |
| 274 | |
| 275 | /* Send a GTP command to the engine. */ |
| 276 | |
| 277 | void |
| 278 | tell_gnugo(char *gnugo_line, const char *msg) |
| 279 | { |
| 280 | gprintf(to_gnugo_stream, gnugo_line); |
| 281 | fflush(to_gnugo_stream); |
| 282 | if (debug) { |
| 283 | fprintf(stderr, "%s: %s", msg, gnugo_line); |
| 284 | fflush(stderr); |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | /* Obtains the engine's response to a GTP command. If verbose is true, |
| 289 | * the reply is echoed to stdout. |
| 290 | */ |
| 291 | |
| 292 | void |
| 293 | ask_gnugo(char *gnugo_line, int verbose, const char *msg) |
| 294 | { |
| 295 | int line_length = 0; |
| 296 | char line[GTP_BUFSIZE]; |
| 297 | |
| 298 | while (line_length != 1) { |
| 299 | if (!fgets(line, 128, from_gnugo_stream)) |
| 300 | error("can't get response"); |
| 301 | line_length = strlen(line); |
| 302 | if (line_length > 1 |
| 303 | && (line[0] == '=' || line[0] == '?')) |
| 304 | strncpy(gnugo_line, line, 128); |
| 305 | if (verbose) |
| 306 | printf(line); |
| 307 | if (debug) |
| 308 | fprintf(stderr, "%s: %s\n", msg, gnugo_line); |
| 309 | } |
| 310 | if (verbose) |
| 311 | fflush(stdout); |
| 312 | fflush(stderr); |
| 313 | } |
| 314 | |
| 315 | |
| 316 | /* Adapted from GNU Go. Formatted output with %m format. */ |
| 317 | |
| 318 | void |
| 319 | gprintf(FILE *outputfile, const char *fmt, ...) |
| 320 | { |
| 321 | va_list ap; |
| 322 | va_start(ap, fmt); |
| 323 | vgprintf(outputfile, fmt, ap); |
| 324 | fflush(outputfile); |
| 325 | va_end(ap); |
| 326 | } |
| 327 | |
| 328 | /* print diagnostic */ |
| 329 | |
| 330 | void |
| 331 | trace(const char *fmt, ...) |
| 332 | { |
| 333 | va_list ap; |
| 334 | if (debug) { |
| 335 | va_start(ap, fmt); |
| 336 | vgprintf(stderr, fmt, ap); |
| 337 | fflush(stderr); |
| 338 | va_end(ap); |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | int |
| 343 | vgprintf(FILE *outputfile, const char *fmt, va_list ap) |
| 344 | { |
| 345 | for ( ; *fmt; ++fmt) { |
| 346 | if (*fmt == '%') { |
| 347 | switch (*++fmt) { |
| 348 | case 'c': |
| 349 | { |
| 350 | /* rules of promotion => passed as int, not char */ |
| 351 | |
| 352 | int c = va_arg(ap, int); |
| 353 | putc(c, outputfile); |
| 354 | break; |
| 355 | } |
| 356 | case 'd': |
| 357 | { |
| 358 | int d = va_arg(ap, int); |
| 359 | fprintf(outputfile, "%d", d); |
| 360 | break; |
| 361 | } |
| 362 | case 'f': |
| 363 | { |
| 364 | double f = va_arg(ap, double); /* passed as double, not float */ |
| 365 | fprintf(outputfile, "%.2f", f); |
| 366 | break; |
| 367 | } |
| 368 | case 's': |
| 369 | { |
| 370 | char *s = va_arg(ap, char *); |
| 371 | fputs(s, outputfile); |
| 372 | break; |
| 373 | } |
| 374 | case 'm': |
| 375 | case 'M': |
| 376 | { |
| 377 | char movename[4]; |
| 378 | int m = va_arg(ap, int); |
| 379 | int n = va_arg(ap, int); |
| 380 | if (m == -1 && n == -1) |
| 381 | fputs("PASS", outputfile); |
| 382 | else if (m < 0 || n < 0 || m >= 19 || n >= 19) |
| 383 | fprintf(outputfile, "[%d,%d]", m, n); |
| 384 | else { |
| 385 | /* Generate the move name. */ |
| 386 | if (n < 8) |
| 387 | movename[0] = n + 65; |
| 388 | else |
| 389 | movename[0] = n + 66; |
| 390 | if (*fmt == 'm') |
| 391 | sprintf(movename+1, "%d", boardsize-m); |
| 392 | else |
| 393 | sprintf(movename+1, "%-2d", boardsize-m); |
| 394 | fputs(movename, outputfile); |
| 395 | } |
| 396 | break; |
| 397 | } |
| 398 | default: |
| 399 | { |
| 400 | fprintf(outputfile, "\n\nUnknown format character: '%c'\n", *fmt); |
| 401 | abort(); |
| 402 | } |
| 403 | } |
| 404 | } |
| 405 | else |
| 406 | putc(*fmt, outputfile); |
| 407 | } |
| 408 | fflush(outputfile); |
| 409 | } |
| 410 | |
| 411 | /* Extracts coordinates from a location in algebraic notation */ |
| 412 | |
| 413 | int |
| 414 | string_to_location(int boardsize, char *str, int *m, int *n) |
| 415 | { |
| 416 | if (*str == '\0') |
| 417 | return 0; |
| 418 | |
| 419 | if (!isalpha((int) *str)) |
| 420 | return 0; |
| 421 | *n = tolower((int) *str) - 'a'; |
| 422 | if (tolower((int) *str) >= 'i') |
| 423 | --*n; |
| 424 | if (*n < 0 || *n > boardsize - 1) |
| 425 | return 0; |
| 426 | |
| 427 | if (!isdigit((int) *(str+1))) |
| 428 | return 0; |
| 429 | *m = boardsize - atoi(str + 1); |
| 430 | if (*m < 0 || *m > boardsize - 1) |
| 431 | return 0; |
| 432 | |
| 433 | return 1; |
| 434 | } |
| 435 | |