scripts/kconfig/zconf.l

   1 %option nostdinit noyywrap never-interactive full ecs
   2 %option 8bit nodefault perf-report perf-report
   3 %option noinput
   4 %x COMMAND HELP STRING PARAM
   5 %{
   6 /*
   7  * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   8  * Released under the terms of the GNU GPL v2.0.
   9  */
  10
  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 void zconf_endhelp(void);
  39 static void zconf_endfile(void);
  40
  41 static void new_string(void)
  42 {
  43         text = xmalloc(START_STRSIZE);
  44         text_asize = START_STRSIZE;
  45         text_size = 0;
  46         *text = 0;
  47 }
  48
  49 static void append_string(const char *str, int size)
  50 {
  51         int new_size = text_size + size + 1;
  52         if (new_size > text_asize) {
  53                 new_size += START_STRSIZE - 1;
  54                 new_size &= -START_STRSIZE;
  55                 text = realloc(text, new_size);
  56                 text_asize = new_size;
  57         }
  58         memcpy(text + text_size, str, size);
  59         text_size += size;
  60         text[text_size] = 0;
  61 }
  62
  63 static void alloc_string(const char *str, int size)
  64 {
  65         text = xmalloc(size + 1);
  66         memcpy(text, str, size);
  67         text[size] = 0;
  68 }
  69 %}
  70
  71 n       [A-Za-z0-9_]
  72
  73 %%
  74         int str = 0;
  75         int ts, i;
  76
  77 [ \t]*#.*\n     |
  78 [ \t]*\n        {
  79         current_file->lineno++;
  80         return T_EOL;
  81 }
  82 [ \t]*#.*
  83
  84
  85 [ \t]+  {
  86         BEGIN(COMMAND);
  87 }
  88
  89 .       {
  90         unput(yytext[0]);
  91         BEGIN(COMMAND);
  92 }
  93
  94
  95 <COMMAND>{
  96         {n}+    {
  97                 const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
  98                 BEGIN(PARAM);
  99                 current_pos.file = current_file;
 100                 current_pos.lineno = current_file->lineno;
 101                 if (id && id->flags & TF_COMMAND) {
 102                         zconflval.id = id;
 103                         return id->token;
 104                 }
 105                 alloc_string(yytext, yyleng);
 106                 zconflval.string = text;
 107                 return T_WORD;
 108         }
 109         .
 110         \n      {
 111                 BEGIN(INITIAL);
 112                 current_file->lineno++;
 113                 return T_EOL;
 114         }
 115 }
 116
 117 <PARAM>{
 118         "&&"    return T_AND;
 119         "||"    return T_OR;
 120         "("     return T_OPEN_PAREN;
 121         ")"     return T_CLOSE_PAREN;
 122         "!"     return T_NOT;
 123         "="     return T_EQUAL;
 124         "!="    return T_UNEQUAL;
 125         \"|\'   {
 126                 str = yytext[0];
 127                 new_string();
 128                 BEGIN(STRING);
 129         }
 130         \n      BEGIN(INITIAL); current_file->lineno++; return T_EOL;
 131         ---     /* ignore */
 132         ({n}|[-/.])+    {
 133                 const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
 134                 if (id && id->flags & TF_PARAM) {
 135                         zconflval.id = id;
 136                         return id->token;
 137                 }
 138                 alloc_string(yytext, yyleng);
 139                 zconflval.string = text;
 140                 return T_WORD;
 141         }
 142         #.*     /* comment */
 143         \\\n    current_file->lineno++;
 144         .
 145         <<EOF>> {
 146                 BEGIN(INITIAL);
 147         }
 148 }
 149
 150 <STRING>{
 151         [^'"\\\n]+/\n   {
 152                 append_string(yytext, yyleng);
 153                 zconflval.string = text;
 154                 return T_WORD_QUOTE;
 155         }
 156         [^'"\\\n]+      {
 157                 append_string(yytext, yyleng);
 158         }
 159         \\.?/\n {
 160                 append_string(yytext + 1, yyleng - 1);
 161                 zconflval.string = text;
 162                 return T_WORD_QUOTE;
 163         }
 164         \\.?    {
 165                 append_string(yytext + 1, yyleng - 1);
 166         }
 167         \'|\"   {
 168                 if (str == yytext[0]) {
 169                         BEGIN(PARAM);
 170                         zconflval.string = text;
 171                         return T_WORD_QUOTE;
 172                 } else
 173                         append_string(yytext, 1);
 174         }
 175         \n      {
 176                 printf("%s:%d:warning: multi-line strings not supported\n", zconf_curname(), zconf_lineno());
 177                 current_file->lineno++;
 178                 BEGIN(INITIAL);
 179                 return T_EOL;
 180         }
 181         <<EOF>> {
 182                 BEGIN(INITIAL);
 183         }
 184 }
 185
 186 <HELP>{
 187         [ \t]+  {
 188                 ts = 0;
 189                 for (i = 0; i < yyleng; i++) {
 190                         if (yytext[i] == '\t')
 191                                 ts = (ts & ~7) + 8;
 192                         else
 193                                 ts++;
 194                 }
 195                 last_ts = ts;
 196                 if (first_ts) {
 197                         if (ts < first_ts) {
 198                                 zconf_endhelp();
 199                                 return T_HELPTEXT;
 200                         }
 201                         ts -= first_ts;
 202                         while (ts > 8) {
 203                                 append_string("        ", 8);
 204                                 ts -= 8;
 205                         }
 206                         append_string("        ", ts);
 207                 }
 208         }
 209         [ \t]*\n/[^ \t\n] {
 210                 current_file->lineno++;
 211                 zconf_endhelp();
 212                 return T_HELPTEXT;
 213         }
 214         [ \t]*\n        {
 215                 current_file->lineno++;
 216                 append_string("\n", 1);
 217         }
 218         [^ \t\n].* {
 219                 while (yyleng) {
 220                         if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
 221                                 break;
 222                         yyleng--;
 223                 }
 224                 append_string(yytext, yyleng);
 225                 if (!first_ts)
 226                         first_ts = last_ts;
 227         }
 228         <<EOF>> {
 229                 zconf_endhelp();
 230                 return T_HELPTEXT;
 231         }
 232 }
 233
 234 <<EOF>> {
 235         if (current_file) {
 236                 zconf_endfile();
 237                 return T_EOL;
 238         }
 239         fclose(yyin);
 240         yyterminate();
 241 }
 242
 243 %%
 244 void zconf_starthelp(void)
 245 {
 246         new_string();
 247         last_ts = first_ts = 0;
 248         BEGIN(HELP);
 249 }
 250
 251 static void zconf_endhelp(void)
 252 {
 253         zconflval.string = text;
 254         BEGIN(INITIAL);
 255 }
 256
 257
 258 /*
 259  * Try to open specified file with following names:
 260  * ./name
 261  * $(srctree)/name
 262  * The latter is used when srctree is separate from objtree
 263  * when compiling the kernel.
 264  * Return NULL if file is not found.
 265  */
 266 FILE *zconf_fopen(const char *name)
 267 {
 268         char *env, fullname[PATH_MAX+1];
 269         FILE *f;
 270
 271         f = fopen(name, "r");
 272         if (!f && name != NULL && name[0] != '/') {
 273                 env = getenv(SRCTREE);
 274                 if (env) {
 275                         sprintf(fullname, "%s/%s", env, name);
 276                         f = fopen(fullname, "r");
 277                 }
 278         }
 279         return f;
 280 }
 281
 282 void zconf_initscan(const char *name)
 283 {
 284         yyin = zconf_fopen(name);
 285         if (!yyin) {
 286                 printf("can't find file %s\n", name);
 287                 exit(1);
 288         }
 289
 290         current_buf = xmalloc(sizeof(*current_buf));
 291         memset(current_buf, 0, sizeof(*current_buf));
 292
 293         current_file = file_lookup(name);
 294         current_file->lineno = 1;
 295 }
 296
 297 void zconf_nextfile(const char *name)
 298 {
 299         struct file *iter;
 300         struct file *file = file_lookup(name);
 301         struct buffer *buf = xmalloc(sizeof(*buf));
 302         memset(buf, 0, sizeof(*buf));
 303
 304         current_buf->state = YY_CURRENT_BUFFER;
 305         yyin = zconf_fopen(file->name);
 306         if (!yyin) {
 307                 printf("%s:%d: can't open file \"%s\"\n",
 308                     zconf_curname(), zconf_lineno(), file->name);
 309                 exit(1);
 310         }
 311         yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
 312         buf->parent = current_buf;
 313         current_buf = buf;
 314
 315         for (iter = current_file->parent; iter; iter = iter->parent ) {
 316                 if (!strcmp(current_file->name,iter->name) ) {
 317                         printf("%s:%d: recursive inclusion detected. "
 318                                "Inclusion path:\n  current file : '%s'\n",
 319                                zconf_curname(), zconf_lineno(),
 320                                zconf_curname());
 321                         iter = current_file->parent;
 322                         while (iter && \
 323                                strcmp(iter->name,current_file->name)) {
 324                                 printf("  included from: '%s:%d'\n",
 325                                        iter->name, iter->lineno-1);
 326                                 iter = iter->parent;
 327                         }
 328                         if (iter)
 329                                 printf("  included from: '%s:%d'\n",
 330                                        iter->name, iter->lineno+1);
 331                         exit(1);
 332                 }
 333         }
 334         file->lineno = 1;
 335         file->parent = current_file;
 336         current_file = file;
 337 }
 338
 339 static void zconf_endfile(void)
 340 {
 341         struct buffer *parent;
 342
 343         current_file = current_file->parent;
 344
 345         parent = current_buf->parent;
 346         if (parent) {
 347                 fclose(yyin);
 348                 yy_delete_buffer(YY_CURRENT_BUFFER);
 349                 yy_switch_to_buffer(parent->state);
 350         }
 351         free(current_buf);
 352         current_buf = parent;
 353 }
 354
 355 int zconf_lineno(void)
 356 {
 357         return current_pos.lineno;
 358 }
 359
 360 const char *zconf_curname(void)
 361 {
 362         return current_pos.file ? current_pos.file->name : "<none>";
 363 }