scripts/config/zconf.l

   1 %option backup nostdinit noyywrap never-interactive full ecs
   2 %option 8bit backup nodefault perf-report perf-report
   3 %x COMMAND HELP STRING PARAM
   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 <limits.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <unistd.h>
  15 #include <glob.h>
  16
  17 #define LKC_DIRECT_LINK
  18 #include "lkc.h"
  19
  20 #define START_STRSIZE   16
  21
  22 static struct {
  23         struct file *file;
  24         int lineno;
  25 } current_pos;
  26
  27 static char *text;
  28 static int text_size, text_asize;
  29
  30 struct buffer {
  31         struct buffer *parent;
  32         YY_BUFFER_STATE state;
  33 };
  34
  35 struct buffer *current_buf;
  36
  37 static int last_ts, first_ts;
  38
  39 static void zconf_endhelp(void);
  40 static void zconf_endfile(void);
  41
  42 void new_string(void)
  43 {
  44         text = malloc(START_STRSIZE);
  45         text_asize = START_STRSIZE;
  46         text_size = 0;
  47         *text = 0;
  48 }
  49
  50 void append_string(const char *str, int size)
  51 {
  52         int new_size = text_size + size + 1;
  53         if (new_size > text_asize) {
  54                 new_size += START_STRSIZE - 1;
  55                 new_size &= -START_STRSIZE;
  56                 text = realloc(text, new_size);
  57                 text_asize = new_size;
  58         }
  59         memcpy(text + text_size, str, size);
  60         text_size += size;
  61         text[text_size] = 0;
  62 }
  63
  64 void alloc_string(const char *str, int size)
  65 {
  66         text = malloc(size + 1);
  67         memcpy(text, str, size);
  68         text[size] = 0;
  69 }
  70 %}
  71
  72 ws      [ \n\t]
  73 n       [A-Za-z0-9_]
  74
  75 %%
  76         int str = 0;
  77         int ts, i;
  78
  79 [ \t]*#.*\n     |
  80 [ \t]*\n        {
  81         current_file->lineno++;
  82         return T_EOL;
  83 }
  84 [ \t]*#.*
  85
  86
  87 [ \t]+  {
  88         BEGIN(COMMAND);
  89 }
  90
  91 .       {
  92         unput(yytext[0]);
  93         BEGIN(COMMAND);
  94 }
  95
  96
  97 <COMMAND>{
  98         {n}+    {
  99                 struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
 100                 BEGIN(PARAM);
 101                 current_pos.file = current_file;
 102                 current_pos.lineno = current_file->lineno;
 103                 if (id && id->flags & TF_COMMAND) {
 104                         zconflval.id = id;
 105                         return id->token;
 106                 }
 107                 alloc_string(yytext, yyleng);
 108                 zconflval.string = text;
 109                 return T_WORD;
 110         }
 111         .
 112         \n      {
 113                 BEGIN(INITIAL);
 114                 current_file->lineno++;
 115                 return T_EOL;
 116         }
 117 }
 118
 119 <PARAM>{
 120         "&&"    return T_AND;
 121         "||"    return T_OR;
 122         "("     return T_OPEN_PAREN;
 123         ")"     return T_CLOSE_PAREN;
 124         "!"     return T_NOT;
 125         "="     return T_EQUAL;
 126         "!="    return T_UNEQUAL;
 127         \"|\'   {
 128                 str = yytext[0];
 129                 new_string();
 130                 BEGIN(STRING);
 131         }
 132         \n      BEGIN(INITIAL); current_file->lineno++; return T_EOL;
 133         ---     /* ignore */
 134         ({n}|[-/.])+    {
 135                 struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
 136                 if (id && id->flags & TF_PARAM) {
 137                         zconflval.id = id;
 138                         return id->token;
 139                 }
 140                 alloc_string(yytext, yyleng);
 141                 zconflval.string = text;
 142                 return T_WORD;
 143         }
 144         #.*     /* comment */
 145         \\\n    current_file->lineno++;
 146         .
 147         <<EOF>> {
 148                 BEGIN(INITIAL);
 149         }
 150 }
 151
 152 <STRING>{
 153         [^'"\\\n]+/\n   {
 154                 append_string(yytext, yyleng);
 155                 zconflval.string = text;
 156                 return T_WORD_QUOTE;
 157         }
 158         [^'"\\\n]+      {
 159                 append_string(yytext, yyleng);
 160         }
 161         \\.?/\n {
 162                 append_string(yytext + 1, yyleng - 1);
 163                 zconflval.string = text;
 164                 return T_WORD_QUOTE;
 165         }
 166         \\.?    {
 167                 append_string(yytext + 1, yyleng - 1);
 168         }
 169         \'|\"   {
 170                 if (str == yytext[0]) {
 171                         BEGIN(PARAM);
 172                         zconflval.string = text;
 173                         return T_WORD_QUOTE;
 174                 } else
 175                         append_string(yytext, 1);
 176         }
 177         \n      {
 178                 printf("%s:%d:warning: multi-line strings not supported\n", zconf_curname(), zconf_lineno());
 179                 current_file->lineno++;
 180                 BEGIN(INITIAL);
 181                 return T_EOL;
 182         }
 183         <<EOF>> {
 184                 BEGIN(INITIAL);
 185         }
 186 }
 187
 188 <HELP>{
 189         [ \t]+  {
 190                 ts = 0;
 191                 for (i = 0; i < yyleng; i++) {
 192                         if (yytext[i] == '\t')
 193                                 ts = (ts & ~7) + 8;
 194                         else
 195                                 ts++;
 196                 }
 197                 last_ts = ts;
 198                 if (first_ts) {
 199                         if (ts < first_ts) {
 200                                 zconf_endhelp();
 201                                 return T_HELPTEXT;
 202                         }
 203                         ts -= first_ts;
 204                         while (ts > 8) {
 205                                 append_string("        ", 8);
 206                                 ts -= 8;
 207                         }
 208                         append_string("        ", ts);
 209                 }
 210         }
 211         [ \t]*\n/[^ \t\n] {
 212                 current_file->lineno++;
 213                 zconf_endhelp();
 214                 return T_HELPTEXT;
 215         }
 216         [ \t]*\n        {
 217                 current_file->lineno++;
 218                 append_string("\n", 1);
 219         }
 220         [^ \t\n].* {
 221                 append_string(yytext, yyleng);
 222                 if (!first_ts)
 223                         first_ts = last_ts;
 224         }
 225         <<EOF>> {
 226                 zconf_endhelp();
 227                 return T_HELPTEXT;
 228         }
 229 }
 230
 231 <<EOF>> {
 232         if (current_file) {
 233                 zconf_endfile();
 234                 return T_EOL;
 235         }
 236         fclose(yyin);
 237         yyterminate();
 238 }
 239
 240 %%
 241 void zconf_starthelp(void)
 242 {
 243         new_string();
 244         last_ts = first_ts = 0;
 245         BEGIN(HELP);
 246 }
 247
 248 static void zconf_endhelp(void)
 249 {
 250         zconflval.string = text;
 251         BEGIN(INITIAL);
 252 }
 253
 254
 255 /*
 256  * Try to open specified file with following names:
 257  * ./name
 258  * $(srctree)/name
 259  * The latter is used when srctree is separate from objtree
 260  * when compiling the kernel.
 261  * Return NULL if file is not found.
 262  */
 263 FILE *zconf_fopen(const char *name)
 264 {
 265         char *env, fullname[PATH_MAX+1];
 266         FILE *f;
 267
 268         f = fopen(name, "r");
 269         if (!f && name[0] != '/') {
 270                 env = getenv(SRCTREE);
 271                 if (env) {
 272                         sprintf(fullname, "%s/%s", env, name);
 273                         f = fopen(fullname, "r");
 274                 }
 275         }
 276         return f;
 277 }
 278
 279 void zconf_initscan(const char *name)
 280 {
 281         yyin = zconf_fopen(name);
 282         if (!yyin) {
 283                 printf("can't find file %s\n", name);
 284                 exit(1);
 285         }
 286
 287         current_buf = malloc(sizeof(*current_buf));
 288         memset(current_buf, 0, sizeof(*current_buf));
 289
 290         current_file = file_lookup(name);
 291         current_file->lineno = 1;
 292         current_file->flags = FILE_BUSY;
 293 }
 294
 295 void zconf_nextfile(const char *name)
 296 {
 297         size_t i;
 298         int retval;
 299         glob_t files;
 300         char *filename;
 301         struct file *file;
 302         struct buffer *buf;
 303
 304         retval = glob(name, GLOB_ERR | GLOB_MARK, NULL, &files);
 305         if (retval == GLOB_NOMATCH)
 306                 return;
 307
 308         if (retval == GLOB_NOSPACE || retval == GLOB_ABORTED) {
 309                 printf("%s:%d: glob failed: %s \"%s\"\n", zconf_curname(), zconf_lineno(),
 310                         retval == GLOB_NOSPACE ? "failed to allocate memory" :
 311                                 retval == GLOB_ABORTED ? "read error" : "no match",
 312                         name);
 313                 exit(1);
 314         }
 315
 316         for (i = files.gl_pathc-1; i != (size_t)-1; --i) {
 317                 filename = files.gl_pathv[i];
 318
 319                 file = file_lookup(filename);
 320                 buf = malloc(sizeof(*buf));
 321                 memset(buf, 0, sizeof(*buf));
 322                 current_buf->state = YY_CURRENT_BUFFER;
 323                 zconfin = zconf_fopen(filename);
 324                 if (!zconfin) {
 325                         printf("%s:%d: can't open file \"%s\"\n",
 326                                 zconf_curname(), zconf_lineno(), filename);
 327                         exit(1);
 328                 }
 329                 zconf_switch_to_buffer(zconf_create_buffer(zconfin,YY_BUF_SIZE));
 330                 buf->parent = current_buf;
 331                 current_buf = buf;
 332
 333                 if (file->flags & FILE_BUSY) {
 334                         printf("recursive scan (%s)?\n", filename);
 335                         exit(1);
 336                 }
 337                 if (file->flags & FILE_SCANNED) {
 338                         printf("file %s already scanned?\n", filename);
 339                         exit(1);
 340                 }
 341                 file->flags |= FILE_BUSY;
 342                 file->lineno = 1;
 343                 file->parent = current_file;
 344                 current_file = file;
 345         }
 346 }
 347
 348 static void zconf_endfile(void)
 349 {
 350         struct buffer *parent;
 351
 352         current_file->flags |= FILE_SCANNED;
 353         current_file->flags &= ~FILE_BUSY;
 354         current_file = current_file->parent;
 355
 356         parent = current_buf->parent;
 357         if (parent) {
 358                 fclose(yyin);
 359                 yy_delete_buffer(YY_CURRENT_BUFFER);
 360                 yy_switch_to_buffer(parent->state);
 361         }
 362         free(current_buf);
 363         current_buf = parent;
 364 }
 365
 366 int zconf_lineno(void)
 367 {
 368         return current_pos.lineno;
 369 }
 370
 371 char *zconf_curname(void)
 372 {
 373         return current_pos.file ? current_pos.file->name : "<none>";
 374 }