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