release/src-rt-6.x/linux/linux-2.6/scripts/kconfig/zconf.y

   1 %{
   2 /*
   3  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   4  * Released under the terms of the GNU GPL v2.0.
   5  */
   6
   7 #include <ctype.h>
   8 #include <stdarg.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <stdbool.h>
  13
  14 #define LKC_DIRECT_LINK
  15 #include "lkc.h"
  16
  17 #include "zconf.hash.c"
  18
  19 #define printd(mask, fmt...) if (cdebug & (mask)) printf(fmt)
  20
  21 #define PRINTD          0x0001
  22 #define DEBUG_PARSE     0x0002
  23
  24 int cdebug = PRINTD;
  25
  26 extern int zconflex(void);
  27 static void zconfprint(const char *err, ...);
  28 static void zconf_error(const char *err, ...);
  29 static void zconferror(const char *err);
  30 static bool zconf_endtoken(struct kconf_id *id, int starttoken, int endtoken);
  31
  32 struct symbol *symbol_hash[257];
  33
  34 static struct menu *current_menu, *current_entry;
  35
  36 #define YYDEBUG 0
  37 #if YYDEBUG
  38 #define YYERROR_VERBOSE
  39 #endif
  40 %}
  41 %expect 26
  42
  43 %union
  44 {
  45         char *string;
  46         struct file *file;
  47         struct symbol *symbol;
  48         struct expr *expr;
  49         struct menu *menu;
  50         struct kconf_id *id;
  51 }
  52
  53 %token <id>T_MAINMENU
  54 %token <id>T_MENU
  55 %token <id>T_ENDMENU
  56 %token <id>T_SOURCE
  57 %token <id>T_CHOICE
  58 %token <id>T_ENDCHOICE
  59 %token <id>T_COMMENT
  60 %token <id>T_CONFIG
  61 %token <id>T_MENUCONFIG
  62 %token <id>T_HELP
  63 %token <string> T_HELPTEXT
  64 %token <id>T_IF
  65 %token <id>T_ENDIF
  66 %token <id>T_DEPENDS
  67 %token <id>T_REQUIRES
  68 %token <id>T_OPTIONAL
  69 %token <id>T_PROMPT
  70 %token <id>T_TYPE
  71 %token <id>T_DEFAULT
  72 %token <id>T_SELECT
  73 %token <id>T_RANGE
  74 %token <id>T_OPTION
  75 %token <id>T_ON
  76 %token <string> T_WORD
  77 %token <string> T_WORD_QUOTE
  78 %token T_UNEQUAL
  79 %token T_CLOSE_PAREN
  80 %token T_OPEN_PAREN
  81 %token T_EOL
  82
  83 %left T_OR
  84 %left T_AND
  85 %left T_EQUAL T_UNEQUAL
  86 %nonassoc T_NOT
  87
  88 %type <string> prompt
  89 %type <symbol> symbol
  90 %type <expr> expr
  91 %type <expr> if_expr
  92 %type <id> end
  93 %type <id> option_name
  94 %type <menu> if_entry menu_entry choice_entry
  95 %type <string> symbol_option_arg
  96
  97 %destructor {
  98         fprintf(stderr, "%s:%d: missing end statement for this entry\n",
  99                 $$->file->name, $$->lineno);
 100         if (current_menu == $$)
 101                 menu_end_menu();
 102 } if_entry menu_entry choice_entry
 103
 104 %%
 105 input: stmt_list;
 106
 107 stmt_list:
 108           /* empty */
 109         | stmt_list common_stmt
 110         | stmt_list choice_stmt
 111         | stmt_list menu_stmt
 112         | stmt_list T_MAINMENU prompt nl
 113         | stmt_list end                 { zconf_error("unexpected end statement"); }
 114         | stmt_list T_WORD error T_EOL  { zconf_error("unknown statement \"%s\"", $2); }
 115         | stmt_list option_name error T_EOL
 116 {
 117         zconf_error("unexpected option \"%s\"", kconf_id_strings + $2->name);
 118 }
 119         | stmt_list error T_EOL         { zconf_error("invalid statement"); }
 120 ;
 121
 122 option_name:
 123         T_DEPENDS | T_PROMPT | T_TYPE | T_SELECT | T_OPTIONAL | T_RANGE | T_DEFAULT
 124 ;
 125
 126 common_stmt:
 127           T_EOL
 128         | if_stmt
 129         | comment_stmt
 130         | config_stmt
 131         | menuconfig_stmt
 132         | source_stmt
 133 ;
 134
 135 option_error:
 136           T_WORD error T_EOL            { zconf_error("unknown option \"%s\"", $1); }
 137         | error T_EOL                   { zconf_error("invalid option"); }
 138 ;
 139
 140
 141 /* config/menuconfig entry */
 142
 143 config_entry_start: T_CONFIG T_WORD T_EOL
 144 {
 145         struct symbol *sym = sym_lookup($2, 0);
 146         sym->flags |= SYMBOL_OPTIONAL;
 147         menu_add_entry(sym);
 148         printd(DEBUG_PARSE, "%s:%d:config %s\n", zconf_curname(), zconf_lineno(), $2);
 149 };
 150
 151 config_stmt: config_entry_start config_option_list
 152 {
 153         menu_end_entry();
 154         printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
 155 };
 156
 157 menuconfig_entry_start: T_MENUCONFIG T_WORD T_EOL
 158 {
 159         struct symbol *sym = sym_lookup($2, 0);
 160         sym->flags |= SYMBOL_OPTIONAL;
 161         menu_add_entry(sym);
 162         printd(DEBUG_PARSE, "%s:%d:menuconfig %s\n", zconf_curname(), zconf_lineno(), $2);
 163 };
 164
 165 menuconfig_stmt: menuconfig_entry_start config_option_list
 166 {
 167         if (current_entry->prompt)
 168                 current_entry->prompt->type = P_MENU;
 169         else
 170                 zconfprint("warning: menuconfig statement without prompt");
 171         menu_end_entry();
 172         printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
 173 };
 174
 175 config_option_list:
 176           /* empty */
 177         | config_option_list config_option
 178         | config_option_list symbol_option
 179         | config_option_list depends
 180         | config_option_list help
 181         | config_option_list option_error
 182         | config_option_list T_EOL
 183 ;
 184
 185 config_option: T_TYPE prompt_stmt_opt T_EOL
 186 {
 187         menu_set_type($1->stype);
 188         printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
 189                 zconf_curname(), zconf_lineno(),
 190                 $1->stype);
 191 };
 192
 193 config_option: T_PROMPT prompt if_expr T_EOL
 194 {
 195         menu_add_prompt(P_PROMPT, $2, $3);
 196         printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
 197 };
 198
 199 config_option: T_DEFAULT expr if_expr T_EOL
 200 {
 201         menu_add_expr(P_DEFAULT, $2, $3);
 202         if ($1->stype != S_UNKNOWN)
 203                 menu_set_type($1->stype);
 204         printd(DEBUG_PARSE, "%s:%d:default(%u)\n",
 205                 zconf_curname(), zconf_lineno(),
 206                 $1->stype);
 207 };
 208
 209 config_option: T_SELECT T_WORD if_expr T_EOL
 210 {
 211         menu_add_symbol(P_SELECT, sym_lookup($2, 0), $3);
 212         printd(DEBUG_PARSE, "%s:%d:select\n", zconf_curname(), zconf_lineno());
 213 };
 214
 215 config_option: T_RANGE symbol symbol if_expr T_EOL
 216 {
 217         menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,$2, $3), $4);
 218         printd(DEBUG_PARSE, "%s:%d:range\n", zconf_curname(), zconf_lineno());
 219 };
 220
 221 symbol_option: T_OPTION symbol_option_list T_EOL
 222 ;
 223
 224 symbol_option_list:
 225           /* empty */
 226         | symbol_option_list T_WORD symbol_option_arg
 227 {
 228         struct kconf_id *id = kconf_id_lookup($2, strlen($2));
 229         if (id && id->flags & TF_OPTION)
 230                 menu_add_option(id->token, $3);
 231         else
 232                 zconfprint("warning: ignoring unknown option %s", $2);
 233         free($2);
 234 };
 235
 236 symbol_option_arg:
 237           /* empty */           { $$ = NULL; }
 238         | T_EQUAL prompt        { $$ = $2; }
 239 ;
 240
 241 /* choice entry */
 242
 243 choice: T_CHOICE T_EOL
 244 {
 245         struct symbol *sym = sym_lookup(NULL, 0);
 246         sym->flags |= SYMBOL_CHOICE;
 247         menu_add_entry(sym);
 248         menu_add_expr(P_CHOICE, NULL, NULL);
 249         printd(DEBUG_PARSE, "%s:%d:choice\n", zconf_curname(), zconf_lineno());
 250 };
 251
 252 choice_entry: choice choice_option_list
 253 {
 254         $$ = menu_add_menu();
 255 };
 256
 257 choice_end: end
 258 {
 259         if (zconf_endtoken($1, T_CHOICE, T_ENDCHOICE)) {
 260                 menu_end_menu();
 261                 printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), zconf_lineno());
 262         }
 263 };
 264
 265 choice_stmt: choice_entry choice_block choice_end
 266 ;
 267
 268 choice_option_list:
 269           /* empty */
 270         | choice_option_list choice_option
 271         | choice_option_list depends
 272         | choice_option_list help
 273         | choice_option_list T_EOL
 274         | choice_option_list option_error
 275 ;
 276
 277 choice_option: T_PROMPT prompt if_expr T_EOL
 278 {
 279         menu_add_prompt(P_PROMPT, $2, $3);
 280         printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
 281 };
 282
 283 choice_option: T_TYPE prompt_stmt_opt T_EOL
 284 {
 285         if ($1->stype == S_BOOLEAN || $1->stype == S_TRISTATE) {
 286                 menu_set_type($1->stype);
 287                 printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
 288                         zconf_curname(), zconf_lineno(),
 289                         $1->stype);
 290         } else
 291                 YYERROR;
 292 };
 293
 294 choice_option: T_OPTIONAL T_EOL
 295 {
 296         current_entry->sym->flags |= SYMBOL_OPTIONAL;
 297         printd(DEBUG_PARSE, "%s:%d:optional\n", zconf_curname(), zconf_lineno());
 298 };
 299
 300 choice_option: T_DEFAULT T_WORD if_expr T_EOL
 301 {
 302         if ($1->stype == S_UNKNOWN) {
 303                 menu_add_symbol(P_DEFAULT, sym_lookup($2, 0), $3);
 304                 printd(DEBUG_PARSE, "%s:%d:default\n",
 305                         zconf_curname(), zconf_lineno());
 306         } else
 307                 YYERROR;
 308 };
 309
 310 choice_block:
 311           /* empty */
 312         | choice_block common_stmt
 313 ;
 314
 315 /* if entry */
 316
 317 if_entry: T_IF expr nl
 318 {
 319         printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
 320         menu_add_entry(NULL);
 321         menu_add_dep($2);
 322         $$ = menu_add_menu();
 323 };
 324
 325 if_end: end
 326 {
 327         if (zconf_endtoken($1, T_IF, T_ENDIF)) {
 328                 menu_end_menu();
 329                 printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
 330         }
 331 };
 332
 333 if_stmt: if_entry if_block if_end
 334 ;
 335
 336 if_block:
 337           /* empty */
 338         | if_block common_stmt
 339         | if_block menu_stmt
 340         | if_block choice_stmt
 341 ;
 342
 343 /* menu entry */
 344
 345 menu: T_MENU prompt T_EOL
 346 {
 347         menu_add_entry(NULL);
 348         menu_add_prompt(P_MENU, $2, NULL);
 349         printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
 350 };
 351
 352 menu_entry: menu depends_list
 353 {
 354         $$ = menu_add_menu();
 355 };
 356
 357 menu_end: end
 358 {
 359         if (zconf_endtoken($1, T_MENU, T_ENDMENU)) {
 360                 menu_end_menu();
 361                 printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), zconf_lineno());
 362         }
 363 };
 364
 365 menu_stmt: menu_entry menu_block menu_end
 366 ;
 367
 368 menu_block:
 369           /* empty */
 370         | menu_block common_stmt
 371         | menu_block menu_stmt
 372         | menu_block choice_stmt
 373 ;
 374
 375 source_stmt: T_SOURCE prompt T_EOL
 376 {
 377         printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), $2);
 378         zconf_nextfile($2);
 379 };
 380
 381 /* comment entry */
 382
 383 comment: T_COMMENT prompt T_EOL
 384 {
 385         menu_add_entry(NULL);
 386         menu_add_prompt(P_COMMENT, $2, NULL);
 387         printd(DEBUG_PARSE, "%s:%d:comment\n", zconf_curname(), zconf_lineno());
 388 };
 389
 390 comment_stmt: comment depends_list
 391 {
 392         menu_end_entry();
 393 };
 394
 395 /* help option */
 396
 397 help_start: T_HELP T_EOL
 398 {
 399         printd(DEBUG_PARSE, "%s:%d:help\n", zconf_curname(), zconf_lineno());
 400         zconf_starthelp();
 401 };
 402
 403 help: help_start T_HELPTEXT
 404 {
 405         current_entry->sym->help = $2;
 406 };
 407
 408 /* depends option */
 409
 410 depends_list:
 411           /* empty */
 412         | depends_list depends
 413         | depends_list T_EOL
 414         | depends_list option_error
 415 ;
 416
 417 depends: T_DEPENDS T_ON expr T_EOL
 418 {
 419         menu_add_dep($3);
 420         printd(DEBUG_PARSE, "%s:%d:depends on\n", zconf_curname(), zconf_lineno());
 421 }
 422         | T_DEPENDS expr T_EOL
 423 {
 424         menu_add_dep($2);
 425         printd(DEBUG_PARSE, "%s:%d:depends\n", zconf_curname(), zconf_lineno());
 426 }
 427         | T_REQUIRES expr T_EOL
 428 {
 429         menu_add_dep($2);
 430         printd(DEBUG_PARSE, "%s:%d:requires\n", zconf_curname(), zconf_lineno());
 431 };
 432
 433 /* prompt statement */
 434
 435 prompt_stmt_opt:
 436           /* empty */
 437         | prompt if_expr
 438 {
 439         menu_add_prompt(P_PROMPT, $1, $2);
 440 };
 441
 442 prompt:   T_WORD
 443         | T_WORD_QUOTE
 444 ;
 445
 446 end:      T_ENDMENU T_EOL       { $$ = $1; }
 447         | T_ENDCHOICE T_EOL     { $$ = $1; }
 448         | T_ENDIF T_EOL         { $$ = $1; }
 449 ;
 450
 451 nl:
 452           T_EOL
 453         | nl T_EOL
 454 ;
 455
 456 if_expr:  /* empty */                   { $$ = NULL; }
 457         | T_IF expr                     { $$ = $2; }
 458 ;
 459
 460 expr:     symbol                                { $$ = expr_alloc_symbol($1); }
 461         | symbol T_EQUAL symbol                 { $$ = expr_alloc_comp(E_EQUAL, $1, $3); }
 462         | symbol T_UNEQUAL symbol               { $$ = expr_alloc_comp(E_UNEQUAL, $1, $3); }
 463         | T_OPEN_PAREN expr T_CLOSE_PAREN       { $$ = $2; }
 464         | T_NOT expr                            { $$ = expr_alloc_one(E_NOT, $2); }
 465         | expr T_OR expr                        { $$ = expr_alloc_two(E_OR, $1, $3); }
 466         | expr T_AND expr                       { $$ = expr_alloc_two(E_AND, $1, $3); }
 467 ;
 468
 469 symbol:   T_WORD        { $$ = sym_lookup($1, 0); free($1); }
 470         | T_WORD_QUOTE  { $$ = sym_lookup($1, 1); free($1); }
 471 ;
 472
 473 %%
 474
 475 void conf_parse(const char *name)
 476 {
 477         struct symbol *sym;
 478         int i;
 479
 480         zconf_initscan(name);
 481
 482         sym_init();
 483         menu_init();
 484         modules_sym = sym_lookup(NULL, 0);
 485         modules_sym->type = S_BOOLEAN;
 486         modules_sym->flags |= SYMBOL_AUTO;
 487         rootmenu.prompt = menu_add_prompt(P_MENU, "Linux Kernel Configuration", NULL);
 488
 489 #if YYDEBUG
 490         if (getenv("ZCONF_DEBUG"))
 491                 zconfdebug = 1;
 492 #endif
 493         zconfparse();
 494         if (zconfnerrs)
 495                 exit(1);
 496         if (!modules_sym->prop) {
 497                 struct property *prop;
 498
 499                 prop = prop_alloc(P_DEFAULT, modules_sym);
 500                 prop->expr = expr_alloc_symbol(sym_lookup("MODULES", 0));
 501         }
 502         menu_finalize(&rootmenu);
 503         for_all_symbols(i, sym) {
 504                 if (sym_check_deps(sym))
 505                         zconfnerrs++;
 506         }
 507         if (zconfnerrs)
 508                 exit(1);
 509         sym_set_change_count(1);
 510 }
 511
 512 const char *zconf_tokenname(int token)
 513 {
 514         switch (token) {
 515         case T_MENU:            return "menu";
 516         case T_ENDMENU:         return "endmenu";
 517         case T_CHOICE:          return "choice";
 518         case T_ENDCHOICE:       return "endchoice";
 519         case T_IF:              return "if";
 520         case T_ENDIF:           return "endif";
 521         case T_DEPENDS:         return "depends";
 522         }
 523         return "<token>";
 524 }
 525
 526 static bool zconf_endtoken(struct kconf_id *id, int starttoken, int endtoken)
 527 {
 528         if (id->token != endtoken) {
 529                 zconf_error("unexpected '%s' within %s block",
 530                         kconf_id_strings + id->name, zconf_tokenname(starttoken));
 531                 zconfnerrs++;
 532                 return false;
 533         }
 534         if (current_menu->file != current_file) {
 535                 zconf_error("'%s' in different file than '%s'",
 536                         kconf_id_strings + id->name, zconf_tokenname(starttoken));
 537                 fprintf(stderr, "%s:%d: location of the '%s'\n",
 538                         current_menu->file->name, current_menu->lineno,
 539                         zconf_tokenname(starttoken));
 540                 zconfnerrs++;
 541                 return false;
 542         }
 543         return true;
 544 }
 545
 546 static void zconfprint(const char *err, ...)
 547 {
 548         va_list ap;
 549
 550         fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
 551         va_start(ap, err);
 552         vfprintf(stderr, err, ap);
 553         va_end(ap);
 554         fprintf(stderr, "\n");
 555 }
 556
 557 static void zconf_error(const char *err, ...)
 558 {
 559         va_list ap;
 560
 561         zconfnerrs++;
 562         fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
 563         va_start(ap, err);
 564         vfprintf(stderr, err, ap);
 565         va_end(ap);
 566         fprintf(stderr, "\n");
 567 }
 568
 569 static void zconferror(const char *err)
 570 {
 571 #if YYDEBUG
 572         fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
 573 #endif
 574 }
 575
 576 void print_quoted_string(FILE *out, const char *str)
 577 {
 578         const char *p;
 579         int len;
 580
 581         putc('"', out);
 582         while ((p = strchr(str, '"'))) {
 583                 len = p - str;
 584                 if (len)
 585                         fprintf(out, "%.*s", len, str);
 586                 fputs("\\\"", out);
 587                 str = p + 1;
 588         }
 589         fputs(str, out);
 590         putc('"', out);
 591 }
 592
 593 void print_symbol(FILE *out, struct menu *menu)
 594 {
 595         struct symbol *sym = menu->sym;
 596         struct property *prop;
 597
 598         if (sym_is_choice(sym))
 599                 fprintf(out, "choice\n");
 600         else
 601                 fprintf(out, "config %s\n", sym->name);
 602         switch (sym->type) {
 603         case S_BOOLEAN:
 604                 fputs("  boolean\n", out);
 605                 break;
 606         case S_TRISTATE:
 607                 fputs("  tristate\n", out);
 608                 break;
 609         case S_STRING:
 610                 fputs("  string\n", out);
 611                 break;
 612         case S_INT:
 613                 fputs("  integer\n", out);
 614                 break;
 615         case S_HEX:
 616                 fputs("  hex\n", out);
 617                 break;
 618         default:
 619                 fputs("  ???\n", out);
 620                 break;
 621         }
 622         for (prop = sym->prop; prop; prop = prop->next) {
 623                 if (prop->menu != menu)
 624                         continue;
 625                 switch (prop->type) {
 626                 case P_PROMPT:
 627                         fputs("  prompt ", out);
 628                         print_quoted_string(out, prop->text);
 629                         if (!expr_is_yes(prop->visible.expr)) {
 630                                 fputs(" if ", out);
 631                                 expr_fprint(prop->visible.expr, out);
 632                         }
 633                         fputc('\n', out);
 634                         break;
 635                 case P_DEFAULT:
 636                         fputs( "  default ", out);
 637                         expr_fprint(prop->expr, out);
 638                         if (!expr_is_yes(prop->visible.expr)) {
 639                                 fputs(" if ", out);
 640                                 expr_fprint(prop->visible.expr, out);
 641                         }
 642                         fputc('\n', out);
 643                         break;
 644                 case P_CHOICE:
 645                         fputs("  #choice value\n", out);
 646                         break;
 647                 default:
 648                         fprintf(out, "  unknown prop %d!\n", prop->type);
 649                         break;
 650                 }
 651         }
 652         if (sym->help) {
 653                 int len = strlen(sym->help);
 654                 while (sym->help[--len] == '\n')
 655                         sym->help[len] = 0;
 656                 fprintf(out, "  help\n%s\n", sym->help);
 657         }
 658         fputc('\n', out);
 659 }
 660
 661 void zconfdump(FILE *out)
 662 {
 663         struct property *prop;
 664         struct symbol *sym;
 665         struct menu *menu;
 666
 667         menu = rootmenu.list;
 668         while (menu) {
 669                 if ((sym = menu->sym))
 670                         print_symbol(out, menu);
 671                 else if ((prop = menu->prompt)) {
 672                         switch (prop->type) {
 673                         case P_COMMENT:
 674                                 fputs("\ncomment ", out);
 675                                 print_quoted_string(out, prop->text);
 676                                 fputs("\n", out);
 677                                 break;
 678                         case P_MENU:
 679                                 fputs("\nmenu ", out);
 680                                 print_quoted_string(out, prop->text);
 681                                 fputs("\n", out);
 682                                 break;
 683                         default:
 684                                 ;
 685                         }
 686                         if (!expr_is_yes(prop->visible.expr)) {
 687                                 fputs("  depends ", out);
 688                                 expr_fprint(prop->visible.expr, out);
 689                                 fputc('\n', out);
 690                         }
 691                         fputs("\n", out);
 692                 }
 693
 694                 if (menu->list)
 695                         menu = menu->list;
 696                 else if (menu->next)
 697                         menu = menu->next;
 698                 else while ((menu = menu->parent)) {
 699                         if (menu->prompt && menu->prompt->type == P_MENU)
 700                                 fputs("\nendmenu\n", out);
 701                         if (menu->next) {
 702                                 menu = menu->next;
 703                                 break;
 704                         }
 705                 }
 706         }
 707 }
 708
 709 #include "lex.zconf.c"
 710 #include "util.c"
 711 #include "confdata.c"
 712 #include "expr.c"
 713 #include "symbol.c"
 714 #include "menu.c"