scripts/kconfig/zconf.l

   1 %option nostdinit noyywrap never-interactive full ecs
   2 %option 8bit nodefault yylineno
   3 %x COMMAND HELP STRING PARAM ASSIGN_VAL
   4 %{
   5 /*
   6  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   7  * Released under the terms of the GNU GPL v2.0.
   8  */
   9
  10 #include <assert.h>
  11 #include <limits.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <unistd.h>
  16
  17 #include "lkc.h"
  18
  19 #define START_STRSIZE   16
  20
  21 static struct {
  22         struct file *file;
  23         int lineno;
  24 } current_pos;
  25
  26 static char *text;
  27 static int text_size, text_asize;
  28
  29 struct buffer {
  30         struct buffer *parent;
  31         YY_BUFFER_STATE state;
  32 };
  33
  34 struct buffer *current_buf;
  35
  36 static int last_ts, first_ts;
  37
  38 static char *expand_token(const char *in, size_t n);
  39 static void append_expanded_string(const char *in);
  40 static void zconf_endhelp(void);
  41 static void zconf_endfile(void);
  42
  43 static void new_string(void)
  44 {
  45         text = xmalloc(START_STRSIZE);
  46         text_asize = START_STRSIZE;
  47         text_size = 0;
  48         *text = 0;
  49 }
  50
  51 static void append_string(const char *str, int size)
  52 {
  53         int new_size = text_size + size + 1;
  54         if (new_size > text_asize) {
  55                 new_size += START_STRSIZE - 1;
  56                 new_size &= -START_STRSIZE;
  57                 text = xrealloc(text, new_size);
  58                 text_asize = new_size;
  59         }
  60         memcpy(text + text_size, str, size);
  61         text_size += size;
  62         text[text_size] = 0;
  63 }
  64
  65 static void alloc_string(const char *str, int size)
  66 {
  67         text = xmalloc(size + 1);
  68         memcpy(text, str, size);
  69         text[size] = 0;
  70 }
  71
  72 static void warn_ignored_character(char chr)
  73 {
  74         fprintf(stderr,
  75                 "%s:%d:warning: ignoring unsupported character '%c'\n",
  76                 zconf_curname(), zconf_lineno(), chr);
  77 }
  78 %}
  79
  80 n       [A-Za-z0-9_-]
  81
  82 %%
  83         int str = 0;
  84         int ts, i;
  85
  86 [ \t]*#.*\n     |
  87 [ \t]*\n        {
  88         return T_EOL;
  89 }
  90 [ \t]*#.*
  91
  92
  93 [ \t]+  {
  94         BEGIN(COMMAND);
  95 }
  96
  97 .       {
  98         unput(yytext[0]);
  99         BEGIN(COMMAND);
 100 }
 101
 102
 103 <COMMAND>{
 104         {n}+    {
 105                 const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
 106                 current_pos.file = current_file;
 107                 current_pos.lineno = yylineno;
 108                 if (id && id->flags & TF_COMMAND) {
 109                         BEGIN(PARAM);
 110                         yylval.id = id;
 111                         return id->token;
 112                 }
 113                 alloc_string(yytext, yyleng);
 114                 yylval.string = text;
 115                 return T_VARIABLE;
 116         }
 117         ({n}|$)+        {
 118                 /* this token includes at least one '$' */
 119                 yylval.string = expand_token(yytext, yyleng);
 120                 if (strlen(yylval.string))
 121                         return T_VARIABLE;
 122                 free(yylval.string);
 123         }
 124         "="     { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_RECURSIVE; return T_ASSIGN; }
 125         ":="    { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_SIMPLE; return T_ASSIGN; }
 126         "+="    { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_APPEND; return T_ASSIGN; }
 127         [[:blank:]]+
 128         .       warn_ignored_character(*yytext);
 129         \n      {
 130                 BEGIN(INITIAL);
 131                 return T_EOL;
 132         }
 133 }
 134
 135 <ASSIGN_VAL>{
 136         [^[:blank:]\n]+.*       {
 137                 alloc_string(yytext, yyleng);
 138                 yylval.string = text;
 139                 return T_ASSIGN_VAL;
 140         }
 141         \n      { BEGIN(INITIAL); return T_EOL; }
 142         .
 143 }
 144
 145 <PARAM>{
 146         "&&"    return T_AND;
 147         "||"    return T_OR;
 148         "("     return T_OPEN_PAREN;
 149         ")"     return T_CLOSE_PAREN;
 150         "!"     return T_NOT;
 151         "="     return T_EQUAL;
 152         "!="    return T_UNEQUAL;
 153         "<="    return T_LESS_EQUAL;
 154         ">="    return T_GREATER_EQUAL;
 155         "<"     return T_LESS;
 156         ">"     return T_GREATER;
 157         \"|\'   {
 158                 str = yytext[0];
 159                 new_string();
 160                 BEGIN(STRING);
 161         }
 162         \n      BEGIN(INITIAL); return T_EOL;
 163         ({n}|[/.])+     {
 164                 const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
 165                 if (id && id->flags & TF_PARAM) {
 166                         yylval.id = id;
 167                         return id->token;
 168                 }
 169                 alloc_string(yytext, yyleng);
 170                 yylval.string = text;
 171                 return T_WORD;
 172         }
 173         ({n}|[/.$])+    {
 174                 /* this token includes at least one '$' */
 175                 yylval.string = expand_token(yytext, yyleng);
 176                 if (strlen(yylval.string))
 177                         return T_WORD;
 178                 free(yylval.string);
 179         }
 180         #.*     /* comment */
 181         \\\n    ;
 182         [[:blank:]]+
 183         .       warn_ignored_character(*yytext);
 184         <<EOF>> {
 185                 BEGIN(INITIAL);
 186         }
 187 }
 188
 189 <STRING>{
 190         "$".*   append_expanded_string(yytext);
 191         [^$'"\\\n]+/\n  {
 192                 append_string(yytext, yyleng);
 193                 yylval.string = text;
 194                 return T_WORD_QUOTE;
 195         }
 196         [^$'"\\\n]+     {
 197                 append_string(yytext, yyleng);
 198         }
 199         \\.?/\n {
 200                 append_string(yytext + 1, yyleng - 1);
 201                 yylval.string = text;
 202                 return T_WORD_QUOTE;
 203         }
 204         \\.?    {
 205                 append_string(yytext + 1, yyleng - 1);
 206         }
 207         \'|\"   {
 208                 if (str == yytext[0]) {
 209                         BEGIN(PARAM);
 210                         yylval.string = text;
 211                         return T_WORD_QUOTE;
 212                 } else
 213                         append_string(yytext, 1);
 214         }
 215         \n      {
 216                 fprintf(stderr,
 217                         "%s:%d:warning: multi-line strings not supported\n",
 218                         zconf_curname(), zconf_lineno());
 219                 BEGIN(INITIAL);
 220                 return T_EOL;
 221         }
 222         <<EOF>> {
 223                 BEGIN(INITIAL);
 224         }
 225 }
 226
 227 <HELP>{
 228         [ \t]+  {
 229                 ts = 0;
 230                 for (i = 0; i < yyleng; i++) {
 231                         if (yytext[i] == '\t')
 232                                 ts = (ts & ~7) + 8;
 233                         else
 234                                 ts++;
 235                 }
 236                 last_ts = ts;
 237                 if (first_ts) {
 238                         if (ts < first_ts) {
 239                                 zconf_endhelp();
 240                                 return T_HELPTEXT;
 241                         }
 242                         ts -= first_ts;
 243                         while (ts > 8) {
 244                                 append_string("        ", 8);
 245                                 ts -= 8;
 246                         }
 247                         append_string("        ", ts);
 248                 }
 249         }
 250         [ \t]*\n/[^ \t\n] {
 251                 zconf_endhelp();
 252                 return T_HELPTEXT;
 253         }
 254         [ \t]*\n        {
 255                 append_string("\n", 1);
 256         }
 257         [^ \t\n].* {
 258                 while (yyleng) {
 259                         if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
 260                                 break;
 261                         yyleng--;
 262                 }
 263                 append_string(yytext, yyleng);
 264                 if (!first_ts)
 265                         first_ts = last_ts;
 266         }
 267         <<EOF>> {
 268                 zconf_endhelp();
 269                 return T_HELPTEXT;
 270         }
 271 }
 272
 273 <<EOF>> {
 274         if (current_file) {
 275                 zconf_endfile();
 276                 return T_EOL;
 277         }
 278         fclose(yyin);
 279         yyterminate();
 280 }
 281
 282 %%
 283 static char *expand_token(const char *in, size_t n)
 284 {
 285         char *out;
 286         int c;
 287         char c2;
 288         const char *rest, *end;
 289
 290         new_string();
 291         append_string(in, n);
 292
 293         /* get the whole line because we do not know the end of token. */
 294         while ((c = input()) != EOF) {
 295                 if (c == '\n') {
 296                         unput(c);
 297                         break;
 298                 }
 299                 c2 = c;
 300                 append_string(&c2, 1);
 301         }
 302
 303         rest = text;
 304         out = expand_one_token(&rest);
 305
 306         /* push back unused characters to the input stream */
 307         end = rest + strlen(rest);
 308         while (end > rest)
 309                 unput(*--end);
 310
 311         free(text);
 312
 313         return out;
 314 }
 315
 316 static void append_expanded_string(const char *str)
 317 {
 318         const char *end;
 319         char *res;
 320
 321         str++;
 322
 323         res = expand_dollar(&str);
 324
 325         /* push back unused characters to the input stream */
 326         end = str + strlen(str);
 327         while (end > str)
 328                 unput(*--end);
 329
 330         append_string(res, strlen(res));
 331
 332         free(res);
 333 }
 334
 335 void zconf_starthelp(void)
 336 {
 337         new_string();
 338         last_ts = first_ts = 0;
 339         BEGIN(HELP);
 340 }
 341
 342 static void zconf_endhelp(void)
 343 {
 344         yylval.string = text;
 345         BEGIN(INITIAL);
 346 }
 347
 348
 349 /*
 350  * Try to open specified file with following names:
 351  * ./name
 352  * $(srctree)/name
 353  * The latter is used when srctree is separate from objtree
 354  * when compiling the kernel.
 355  * Return NULL if file is not found.
 356  */
 357 FILE *zconf_fopen(const char *name)
 358 {
 359         char *env, fullname[PATH_MAX+1];
 360         FILE *f;
 361
 362         f = fopen(name, "r");
 363         if (!f && name != NULL && name[0] != '/') {
 364                 env = getenv(SRCTREE);
 365                 if (env) {
 366                         sprintf(fullname, "%s/%s", env, name);
 367                         f = fopen(fullname, "r");
 368                 }
 369         }
 370         return f;
 371 }
 372
 373 void zconf_initscan(const char *name)
 374 {
 375         yyin = zconf_fopen(name);
 376         if (!yyin) {
 377                 fprintf(stderr, "can't find file %s\n", name);
 378                 exit(1);
 379         }
 380
 381         current_buf = xmalloc(sizeof(*current_buf));
 382         memset(current_buf, 0, sizeof(*current_buf));
 383
 384         current_file = file_lookup(name);
 385         yylineno = 1;
 386 }
 387
 388 void zconf_nextfile(const char *name)
 389 {
 390         struct file *iter;
 391         struct file *file = file_lookup(name);
 392         struct buffer *buf = xmalloc(sizeof(*buf));
 393         memset(buf, 0, sizeof(*buf));
 394
 395         current_buf->state = YY_CURRENT_BUFFER;
 396         yyin = zconf_fopen(file->name);
 397         if (!yyin) {
 398                 fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
 399                         zconf_curname(), zconf_lineno(), file->name);
 400                 exit(1);
 401         }
 402         yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
 403         buf->parent = current_buf;
 404         current_buf = buf;
 405
 406         current_file->lineno = yylineno;
 407         file->parent = current_file;
 408
 409         for (iter = current_file; iter; iter = iter->parent) {
 410                 if (!strcmp(iter->name, file->name)) {
 411                         fprintf(stderr,
 412                                 "Recursive inclusion detected.\n"
 413                                 "Inclusion path:\n"
 414                                 "  current file : %s\n", file->name);
 415                         iter = file;
 416                         do {
 417                                 iter = iter->parent;
 418                                 fprintf(stderr, "  included from: %s:%d\n",
 419                                         iter->name, iter->lineno - 1);
 420                         } while (strcmp(iter->name, file->name));
 421                         exit(1);
 422                 }
 423         }
 424
 425         yylineno = 1;
 426         current_file = file;
 427 }
 428
 429 static void zconf_endfile(void)
 430 {
 431         struct buffer *parent;
 432
 433         current_file = current_file->parent;
 434         if (current_file)
 435                 yylineno = current_file->lineno;
 436
 437         parent = current_buf->parent;
 438         if (parent) {
 439                 fclose(yyin);
 440                 yy_delete_buffer(YY_CURRENT_BUFFER);
 441                 yy_switch_to_buffer(parent->state);
 442         }
 443         free(current_buf);
 444         current_buf = parent;
 445 }
 446
 447 int zconf_lineno(void)
 448 {
 449         return current_pos.lineno;
 450 }
 451
 452 const char *zconf_curname(void)
 453 {
 454         return current_pos.file ? current_pos.file->name : "<none>";
 455 }