lib/sl/slc-gram.y

   1 %{
   2 /*
   3  * Copyright (c) 2004-2006 Kungliga Tekniska Högskolan
   4  * (Royal Institute of Technology, Stockholm, Sweden).
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * 3. Neither the name of the Institute nor the names of its contributors
  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 INSTITUTE 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 INSTITUTE 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
  35 #include <config.h>
  36
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <err.h>
  40 #include <ctype.h>
  41 #include <limits.h>
  42 #include <getarg.h>
  43 #include <vers.h>
  44 #include <roken.h>
  45
  46 #include "slc.h"
  47 extern FILE *yyin;
  48 extern struct assignment *assignment;
  49
  50 /* Declarations for Bison:
  51  */
  52 #define YYMALLOC        malloc
  53 #define YYFREE          free
  54
  55 %}
  56
  57 %union {
  58         char *string;
  59         struct assignment *assignment;
  60 }
  61
  62 %token <string> LITERAL
  63 %token <string> STRING
  64 %type <assignment> assignment assignments
  65
  66 %start start
  67
  68 %%
  69
  70 start           : assignments
  71                 {
  72                         assignment = $1;
  73                 }
  74                 ;
  75
  76 assignments     : assignment assignments
  77                 {
  78                         $1->next = $2;
  79                         $$ = $1;
  80                 }
  81                 | assignment
  82                 ;
  83
  84 assignment      : LITERAL '=' STRING
  85                 {
  86                         $$ = malloc(sizeof(*$$));
  87                         $$->name = $1;
  88                         $$->type = a_value;
  89                         $$->lineno = lineno;
  90                         $$->u.value = $3;
  91                         $$->next = NULL;
  92                 }
  93                 | LITERAL '=' '{' assignments '}'
  94                 {
  95                         $$ = malloc(sizeof(*$$));
  96                         $$->name = $1;
  97                         $$->type = a_assignment;
  98                         $$->lineno = lineno;
  99                         $$->u.assignment = $4;
 100                         $$->next = NULL;
 101                 }
 102                 ;
 103
 104 %%
 105 char *filename;
 106 FILE *cfile, *hfile;
 107 int error_flag;
 108 struct assignment *assignment;
 109
 110
 111 static void
 112 ex(struct assignment *a, const char *fmt, ...)
 113 {
 114     va_list ap;
 115     fprintf(stderr, "%s:%d: ", a->name, a->lineno);
 116     va_start(ap, fmt);
 117     vfprintf(stderr, fmt, ap);
 118     va_end(ap);
 119     fprintf(stderr, "\n");
 120 }
 121
 122
 123
 124 static int
 125 check_option(struct assignment *as)
 126 {
 127     struct assignment *a;
 128     int seen_long = 0;
 129     int seen_name = 0;
 130     int seen_short = 0;
 131     int seen_type = 0;
 132     int seen_argument = 0;
 133     int seen_help = 0;
 134     int seen_default = 0;
 135     int ret = 0;
 136
 137     for(a = as; a != NULL; a = a->next) {
 138         if(strcmp(a->name, "long") == 0)
 139             seen_long++;
 140         else if(strcmp(a->name, "short") == 0)
 141             seen_short++;
 142         else if(strcmp(a->name, "name") == 0)
 143             seen_name++;
 144         else if(strcmp(a->name, "type") == 0)
 145             seen_type++;
 146         else if(strcmp(a->name, "argument") == 0)
 147             seen_argument++;
 148         else if(strcmp(a->name, "help") == 0)
 149             seen_help++;
 150         else if(strcmp(a->name, "default") == 0)
 151             seen_default++;
 152         else {
 153             ex(a, "unknown name %s", a->name);
 154             ret++;
 155         }
 156     }
 157     if(seen_long == 0 && seen_short == 0) {
 158         ex(as, "neither long nor short option");
 159         ret++;
 160     }
 161     if (seen_long == 0 && seen_name == 0) {
 162         ex(as, "either of long or name option must be used");
 163         ret++;
 164     }
 165     if(seen_long > 1) {
 166         ex(as, "multiple long options");
 167         ret++;
 168     }
 169     if(seen_short > 1) {
 170         ex(as, "multiple short options");
 171         ret++;
 172     }
 173     if(seen_type > 1) {
 174         ex(as, "multiple types");
 175         ret++;
 176     }
 177     if(seen_argument > 1) {
 178         ex(as, "multiple arguments");
 179         ret++;
 180     }
 181     if(seen_help > 1) {
 182         ex(as, "multiple help strings");
 183         ret++;
 184     }
 185     if(seen_default > 1) {
 186         ex(as, "multiple default values");
 187         ret++;
 188     }
 189     return ret;
 190 }
 191
 192 static int
 193 check_command(struct assignment *as)
 194 {
 195         struct assignment *a;
 196         int seen_name = 0;
 197         int seen_function = 0;
 198         int seen_help = 0;
 199         int seen_argument = 0;
 200         int seen_minargs = 0;
 201         int seen_maxargs = 0;
 202         int ret = 0;
 203         for(a = as; a != NULL; a = a->next) {
 204                 if(strcmp(a->name, "name") == 0)
 205                         seen_name++;
 206                 else if(strcmp(a->name, "function") == 0) {
 207                         seen_function++;
 208                 } else if(strcmp(a->name, "option") == 0)
 209                         ret += check_option(a->u.assignment);
 210                 else if(strcmp(a->name, "help") == 0) {
 211                         seen_help++;
 212                 } else if(strcmp(a->name, "argument") == 0) {
 213                         seen_argument++;
 214                 } else if(strcmp(a->name, "min_args") == 0) {
 215                         seen_minargs++;
 216                 } else if(strcmp(a->name, "max_args") == 0) {
 217                         seen_maxargs++;
 218                 } else {
 219                         ex(a, "unknown name: %s", a->name);
 220                         ret++;
 221                 }
 222         }
 223         if(seen_name == 0) {
 224                 ex(as, "no command name");
 225                 ret++;
 226         }
 227         if(seen_function > 1) {
 228                 ex(as, "multiple function names");
 229                 ret++;
 230         }
 231         if(seen_help > 1) {
 232                 ex(as, "multiple help strings");
 233                 ret++;
 234         }
 235         if(seen_argument > 1) {
 236                 ex(as, "multiple argument strings");
 237                 ret++;
 238         }
 239         if(seen_minargs > 1) {
 240                 ex(as, "multiple min_args strings");
 241                 ret++;
 242         }
 243         if(seen_maxargs > 1) {
 244                 ex(as, "multiple max_args strings");
 245                 ret++;
 246         }
 247
 248         return ret;
 249 }
 250
 251 static int
 252 check(struct assignment *as)
 253 {
 254     struct assignment *a;
 255     int ret = 0;
 256     for(a = as; a != NULL; a = a->next) {
 257         if(strcmp(a->name, "command")) {
 258             fprintf(stderr, "unknown type %s line %d\n", a->name, a->lineno);
 259             ret++;
 260             continue;
 261         }
 262         if(a->type != a_assignment) {
 263             fprintf(stderr, "bad command definition %s line %d\n", a->name, a->lineno);
 264             ret++;
 265             continue;
 266         }
 267         ret += check_command(a->u.assignment);
 268     }
 269     return ret;
 270 }
 271
 272 static struct assignment *
 273 find_next(struct assignment *as, const char *name)
 274 {
 275     for(as = as->next; as != NULL; as = as->next) {
 276         if(strcmp(as->name, name) == 0)
 277             return as;
 278     }
 279     return NULL;
 280 }
 281
 282 static struct assignment *
 283 find(struct assignment *as, const char *name)
 284 {
 285     for(; as != NULL; as = as->next) {
 286         if(strcmp(as->name, name) == 0)
 287             return as;
 288     }
 289     return NULL;
 290 }
 291
 292 static void
 293 space(FILE *f, int level)
 294 {
 295     fprintf(f, "%*.*s", level * 4, level * 4, " ");
 296 }
 297
 298 static void
 299 cprint(int level, const char *fmt, ...)
 300 {
 301     va_list ap;
 302     va_start(ap, fmt);
 303     space(cfile, level);
 304     vfprintf(cfile, fmt, ap);
 305     va_end(ap);
 306 }
 307
 308 static void
 309 hprint(int level, const char *fmt, ...)
 310 {
 311     va_list ap;
 312     va_start(ap, fmt);
 313     space(hfile, level);
 314     vfprintf(hfile, fmt, ap);
 315     va_end(ap);
 316 }
 317
 318 static void gen_name(char *str);
 319
 320 static void
 321 gen_command(struct assignment *as)
 322 {
 323     struct assignment *a, *b;
 324     char *f;
 325     a = find(as, "name");
 326     f = strdup(a->u.value);
 327     gen_name(f);
 328     cprint(1, "    { ");
 329     fprintf(cfile, "\"%s\", ", a->u.value);
 330     fprintf(cfile, "%s_wrap, ", f);
 331     b = find(as, "argument");
 332     if(b)
 333         fprintf(cfile, "\"%s %s\", ", a->u.value, b->u.value);
 334     else
 335         fprintf(cfile, "\"%s\", ", a->u.value);
 336     b = find(as, "help");
 337     if(b)
 338         fprintf(cfile, "\"%s\"", b->u.value);
 339     else
 340         fprintf(cfile, "NULL");
 341     fprintf(cfile, " },\n");
 342     for(a = a->next; a != NULL; a = a->next)
 343         if(strcmp(a->name, "name") == 0)
 344             cprint(1, "    { \"%s\" },\n", a->u.value);
 345     cprint(0, "\n");
 346 }
 347
 348 static void
 349 gen_name(char *str)
 350 {
 351     char *p;
 352     for(p = str; *p != '\0'; p++)
 353         if(!isalnum((unsigned char)*p))
 354             *p = '_';
 355 }
 356
 357 static char *
 358 make_name(struct assignment *as)
 359 {
 360     struct assignment *lopt;
 361     struct assignment *type;
 362     char *s;
 363
 364     lopt = find(as, "long");
 365     if(lopt == NULL)
 366         lopt = find(as, "name");
 367     if(lopt == NULL)
 368         return NULL;
 369
 370     type = find(as, "type");
 371     if(strcmp(type->u.value, "-flag") == 0)
 372         asprintf(&s, "%s_flag", lopt->u.value);
 373     else
 374         asprintf(&s, "%s_%s", lopt->u.value, type->u.value);
 375     gen_name(s);
 376     return s;
 377 }
 378
 379
 380 static void defval_int(const char *name, struct assignment *defval)
 381 {
 382     if(defval != NULL)
 383         cprint(1, "opt.%s = %s;\n", name, defval->u.value);
 384     else
 385         cprint(1, "opt.%s = 0;\n", name);
 386 }
 387 static void defval_neg_flag(const char *name, struct assignment *defval)
 388 {
 389     if(defval != NULL)
 390         cprint(1, "opt.%s = %s;\n", name, defval->u.value);
 391     else
 392         cprint(1, "opt.%s = 1;\n", name);
 393 }
 394 static void defval_string(const char *name, struct assignment *defval)
 395 {
 396     if(defval != NULL)
 397         cprint(1, "opt.%s = (char *)(unsigned long)\"%s\";\n", name, defval->u.value);
 398     else
 399         cprint(1, "opt.%s = NULL;\n", name);
 400 }
 401 static void defval_strings(const char *name, struct assignment *defval)
 402 {
 403     cprint(1, "opt.%s.num_strings = 0;\n", name);
 404     cprint(1, "opt.%s.strings = NULL;\n", name);
 405 }
 406
 407 static void free_strings(const char *name)
 408 {
 409     cprint(1, "free_getarg_strings (&opt.%s);\n", name);
 410 }
 411
 412 struct type_handler {
 413     const char *typename;
 414     const char *c_type;
 415     const char *getarg_type;
 416     void (*defval)(const char*, struct assignment*);
 417     void (*free)(const char*);
 418 } type_handlers[] = {
 419         { "integer",
 420           "int",
 421           "arg_integer",
 422           defval_int,
 423           NULL
 424         },
 425         { "string",
 426           "char*",
 427           "arg_string",
 428           defval_string,
 429           NULL
 430         },
 431         { "strings",
 432           "struct getarg_strings",
 433           "arg_strings",
 434           defval_strings,
 435           free_strings
 436         },
 437         { "flag",
 438           "int",
 439           "arg_flag",
 440           defval_int,
 441           NULL
 442         },
 443         { "-flag",
 444           "int",
 445           "arg_negative_flag",
 446           defval_neg_flag,
 447           NULL
 448         },
 449         { NULL }
 450 };
 451
 452 static struct type_handler *find_handler(struct assignment *type)
 453 {
 454     struct type_handler *th;
 455     for(th = type_handlers; th->typename != NULL; th++)
 456         if(strcmp(type->u.value, th->typename) == 0)
 457             return th;
 458     ex(type, "unknown type \"%s\"", type->u.value);
 459     exit(1);
 460 }
 461
 462 static void
 463 gen_options(struct assignment *opt1, const char *name)
 464 {
 465     struct assignment *tmp;
 466
 467     hprint(0, "struct %s_options {\n", name);
 468
 469     for(tmp = opt1;
 470         tmp != NULL;
 471         tmp = find_next(tmp, "option")) {
 472         struct assignment *type;
 473         struct type_handler *th;
 474         char *s;
 475
 476         s = make_name(tmp->u.assignment);
 477         type = find(tmp->u.assignment, "type");
 478         th = find_handler(type);
 479         hprint(1, "%s %s;\n", th->c_type, s);
 480         free(s);
 481     }
 482     hprint(0, "};\n");
 483 }
 484
 485 static void
 486 gen_wrapper(struct assignment *as)
 487 {
 488     struct assignment *name;
 489     struct assignment *arg;
 490     struct assignment *opt1;
 491     struct assignment *function;
 492     struct assignment *tmp;
 493     char *n, *f;
 494     int nargs = 0;
 495
 496     name = find(as, "name");
 497     n = strdup(name->u.value);
 498     gen_name(n);
 499     arg = find(as, "argument");
 500     opt1 = find(as, "option");
 501     function = find(as, "function");
 502     if(function)
 503         f = function->u.value;
 504     else
 505         f = n;
 506
 507
 508     if(opt1 != NULL) {
 509         gen_options(opt1, n);
 510         hprint(0, "int %s(struct %s_options*, int, char **);\n", f, n);
 511     } else {
 512         hprint(0, "int %s(void*, int, char **);\n", f);
 513     }
 514
 515     fprintf(cfile, "static int\n");
 516     fprintf(cfile, "%s_wrap(int argc, char **argv)\n", n);
 517     fprintf(cfile, "{\n");
 518     if(opt1 != NULL)
 519         cprint(1, "struct %s_options opt;\n", n);
 520     cprint(1, "int ret;\n");
 521     cprint(1, "int optidx = 0;\n");
 522     cprint(1, "struct getargs args[] = {\n");
 523     for(tmp = find(as, "option");
 524         tmp != NULL;
 525         tmp = find_next(tmp, "option")) {
 526         struct assignment *type = find(tmp->u.assignment, "type");
 527         struct assignment *lopt = find(tmp->u.assignment, "long");
 528         struct assignment *sopt = find(tmp->u.assignment, "short");
 529         struct assignment *aarg = find(tmp->u.assignment, "argument");
 530         struct assignment *help = find(tmp->u.assignment, "help");
 531
 532         struct type_handler *th;
 533
 534         cprint(2, "{ ");
 535         if(lopt)
 536             fprintf(cfile, "\"%s\", ", lopt->u.value);
 537         else
 538             fprintf(cfile, "NULL, ");
 539         if(sopt)
 540             fprintf(cfile, "'%c', ", *sopt->u.value);
 541         else
 542             fprintf(cfile, "0, ");
 543         th = find_handler(type);
 544         fprintf(cfile, "%s, ", th->getarg_type);
 545         fprintf(cfile, "NULL, ");
 546         if(help)
 547             fprintf(cfile, "\"%s\", ", help->u.value);
 548         else
 549             fprintf(cfile, "NULL, ");
 550         if(aarg)
 551             fprintf(cfile, "\"%s\"", aarg->u.value);
 552         else
 553             fprintf(cfile, "NULL");
 554         fprintf(cfile, " },\n");
 555     }
 556     cprint(2, "{ \"help\", 'h', arg_flag, NULL, NULL, NULL }\n");
 557     cprint(1, "};\n");
 558     cprint(1, "int help_flag = 0;\n");
 559
 560     for(tmp = find(as, "option");
 561         tmp != NULL;
 562         tmp = find_next(tmp, "option")) {
 563         char *s;
 564         struct assignment *type = find(tmp->u.assignment, "type");
 565
 566         struct assignment *defval = find(tmp->u.assignment, "default");
 567
 568         struct type_handler *th;
 569
 570         s = make_name(tmp->u.assignment);
 571         th = find_handler(type);
 572         (*th->defval)(s, defval);
 573         free(s);
 574     }
 575
 576     for(tmp = find(as, "option");
 577         tmp != NULL;
 578         tmp = find_next(tmp, "option")) {
 579         char *s;
 580         s = make_name(tmp->u.assignment);
 581         cprint(1, "args[%d].value = &opt.%s;\n", nargs++, s);
 582         free(s);
 583     }
 584     cprint(1, "args[%d].value = &help_flag;\n", nargs++);
 585     cprint(1, "if(getarg(args, %d, argc, argv, &optidx))\n", nargs);
 586     cprint(2, "goto usage;\n");
 587
 588     {
 589         int min_args = -1;
 590         int max_args = -1;
 591         char *end;
 592         if(arg == NULL) {
 593             max_args = 0;
 594         } else {
 595             if((tmp = find(as, "min_args")) != NULL) {
 596                 min_args = strtol(tmp->u.value, &end, 0);
 597                 if(*end != '\0') {
 598                     ex(tmp, "min_args is not numeric");
 599                     exit(1);
 600                 }
 601                 if(min_args < 0) {
 602                     ex(tmp, "min_args must be non-negative");
 603                     exit(1);
 604                 }
 605             }
 606             if((tmp = find(as, "max_args")) != NULL) {
 607                 max_args = strtol(tmp->u.value, &end, 0);
 608                 if(*end != '\0') {
 609                     ex(tmp, "max_args is not numeric");
 610                     exit(1);
 611                 }
 612                 if(max_args < 0) {
 613                     ex(tmp, "max_args must be non-negative");
 614                     exit(1);
 615                 }
 616             }
 617         }
 618         if(min_args != -1 || max_args != -1) {
 619             if(min_args == max_args) {
 620                 cprint(1, "if(argc - optidx != %d) {\n",
 621                        min_args);
 622                 cprint(2, "fprintf(stderr, \"Need exactly %u parameters (%%u given).\\n\\n\", argc - optidx);\n", min_args);
 623                 cprint(2, "goto usage;\n");
 624                 cprint(1, "}\n");
 625             } else {
 626                 if(max_args != -1) {
 627                     cprint(1, "if(argc - optidx > %d) {\n", max_args);
 628                     cprint(2, "fprintf(stderr, \"Arguments given (%%u) are more than expected (%u).\\n\\n\", argc - optidx);\n", max_args);
 629                     cprint(2, "goto usage;\n");
 630                     cprint(1, "}\n");
 631                 }
 632                 if(min_args != -1) {
 633                     cprint(1, "if(argc - optidx < %d) {\n", min_args);
 634                     cprint(2, "fprintf(stderr, \"Arguments given (%%u) are less than expected (%u).\\n\\n\", argc - optidx);\n", min_args);
 635                     cprint(2, "goto usage;\n");
 636                     cprint(1, "}\n");
 637                 }
 638             }
 639         }
 640     }
 641
 642     cprint(1, "if(help_flag)\n");
 643     cprint(2, "goto usage;\n");
 644
 645     cprint(1, "ret = %s(%s, argc - optidx, argv + optidx);\n",
 646            f, opt1 ? "&opt": "NULL");
 647
 648     /* free allocated data */
 649     for(tmp = find(as, "option");
 650         tmp != NULL;
 651         tmp = find_next(tmp, "option")) {
 652         char *s;
 653         struct assignment *type = find(tmp->u.assignment, "type");
 654         struct type_handler *th;
 655         th = find_handler(type);
 656         if(th->free == NULL)
 657             continue;
 658         s = make_name(tmp->u.assignment);
 659         (*th->free)(s);
 660         free(s);
 661     }
 662     cprint(1, "return ret;\n");
 663
 664     cprint(0, "usage:\n");
 665     cprint(1, "arg_printusage (args, %d, \"%s\", \"%s\");\n", nargs,
 666            name->u.value, arg ? arg->u.value : "");
 667     /* free allocated data */
 668     for(tmp = find(as, "option");
 669         tmp != NULL;
 670         tmp = find_next(tmp, "option")) {
 671         char *s;
 672         struct assignment *type = find(tmp->u.assignment, "type");
 673         struct type_handler *th;
 674         th = find_handler(type);
 675         if(th->free == NULL)
 676             continue;
 677         s = make_name(tmp->u.assignment);
 678         (*th->free)(s);
 679         free(s);
 680     }
 681     cprint(1, "return 0;\n");
 682     cprint(0, "}\n");
 683     cprint(0, "\n");
 684 }
 685
 686 char cname[PATH_MAX];
 687 char hname[PATH_MAX];
 688
 689 static void
 690 gen(struct assignment *as)
 691 {
 692     struct assignment *a;
 693     cprint(0, "#include <stdio.h>\n");
 694     cprint(0, "#include <getarg.h>\n");
 695     cprint(0, "#include <sl.h>\n");
 696     cprint(0, "#include \"%s\"\n\n", hname);
 697
 698     hprint(0, "#include <stdio.h>\n");
 699     hprint(0, "#include <sl.h>\n");
 700     hprint(0, "\n");
 701
 702
 703     for(a = as; a != NULL; a = a->next)
 704         gen_wrapper(a->u.assignment);
 705
 706     cprint(0, "SL_cmd commands[] = {\n");
 707     for(a = as; a != NULL; a = a->next)
 708         gen_command(a->u.assignment);
 709     cprint(1, "{ NULL }\n");
 710     cprint(0, "};\n");
 711
 712     hprint(0, "extern SL_cmd commands[];\n");
 713 }
 714
 715 int version_flag;
 716 int help_flag;
 717 struct getargs args[] = {
 718     { "version", 0, arg_flag, &version_flag },
 719     { "help", 0, arg_flag, &help_flag }
 720 };
 721 int num_args = sizeof(args) / sizeof(args[0]);
 722
 723 static void
 724 usage(int code)
 725 {
 726     arg_printusage(args, num_args, NULL, "command-table");
 727     exit(code);
 728 }
 729
 730 int
 731 main(int argc, char **argv)
 732 {
 733     char *p;
 734
 735     int optidx = 0;
 736
 737     setprogname(argv[0]);
 738     if(getarg(args, num_args, argc, argv, &optidx))
 739         usage(1);
 740     if(help_flag)
 741         usage(0);
 742     if(version_flag) {
 743         print_version(NULL);
 744         exit(0);
 745     }
 746
 747     if(argc == optidx)
 748         usage(1);
 749
 750     filename = argv[optidx];
 751     yyin = fopen(filename, "r");
 752     if(yyin == NULL)
 753         err(1, "%s", filename);
 754     p = strrchr(filename, '/');
 755     if(p)
 756         strlcpy(cname, p + 1, sizeof(cname));
 757     else
 758         strlcpy(cname, filename, sizeof(cname));
 759     p = strrchr(cname, '.');
 760     if(p)
 761         *p = '\0';
 762     strlcpy(hname, cname, sizeof(hname));
 763     strlcat(cname, ".c", sizeof(cname));
 764     strlcat(hname, ".h", sizeof(hname));
 765     yyparse();
 766     if(error_flag)
 767         exit(1);
 768     if(check(assignment) == 0) {
 769         cfile = fopen(cname, "w");
 770         if(cfile == NULL)
 771           err(1, "%s", cname);
 772         hfile = fopen(hname, "w");
 773         if(hfile == NULL)
 774           err(1, "%s", hname);
 775         gen(assignment);
 776         fclose(cfile);
 777         fclose(hfile);
 778     }
 779     fclose(yyin);
 780     return 0;
 781 }