1 %option nostdinit noyywrap never-interactive full ecs 2 %option 8bit nodefault yylineno 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 = xrealloc(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 static void warn_ignored_character(char chr) 71 { 72 fprintf(stderr, 73 "%s:%d:warning: ignoring unsupported character '%c'\n", 74 zconf_curname(), zconf_lineno(), chr); 75 } 76 %} 77 78 n [A-Za-z0-9_-] 79 80 %% 81 int str = 0; 82 int ts, i; 83 84 [ \t]*#.*\n | 85 [ \t]*\n { 86 return T_EOL; 87 } 88 [ \t]*#.* 89 90 91 [ \t]+ { 92 BEGIN(COMMAND); 93 } 94 95 . { 96 unput(yytext[0]); 97 BEGIN(COMMAND); 98 } 99 100 101 <COMMAND>{ 102 {n}+ { 103 const struct kconf_id *id = kconf_id_lookup(yytext, yyleng); 104 BEGIN(PARAM); 105 current_pos.file = current_file; 106 current_pos.lineno = yylineno; 107 if (id && id->flags & TF_COMMAND) { 108 yylval.id = id; 109 return id->token; 110 } 111 alloc_string(yytext, yyleng); 112 yylval.string = text; 113 return T_WORD; 114 } 115 . warn_ignored_character(*yytext); 116 \n { 117 BEGIN(INITIAL); 118 return T_EOL; 119 } 120 } 121 122 <PARAM>{ 123 "&&" return T_AND; 124 "||" return T_OR; 125 "(" return T_OPEN_PAREN; 126 ")" return T_CLOSE_PAREN; 127 "!" return T_NOT; 128 "=" return T_EQUAL; 129 "!=" return T_UNEQUAL; 130 "<=" return T_LESS_EQUAL; 131 ">=" return T_GREATER_EQUAL; 132 "<" return T_LESS; 133 ">" return T_GREATER; 134 \"|\' { 135 str = yytext[0]; 136 new_string(); 137 BEGIN(STRING); 138 } 139 \n BEGIN(INITIAL); return T_EOL; 140 ({n}|[/.])+ { 141 const struct kconf_id *id = kconf_id_lookup(yytext, yyleng); 142 if (id && id->flags & TF_PARAM) { 143 yylval.id = id; 144 return id->token; 145 } 146 alloc_string(yytext, yyleng); 147 yylval.string = text; 148 return T_WORD; 149 } 150 #.* /* comment */ 151 \\\n ; 152 [[:blank:]]+ 153 . warn_ignored_character(*yytext); 154 <<EOF>> { 155 BEGIN(INITIAL); 156 } 157 } 158 159 <STRING>{ 160 [^'"\\\n]+/\n { 161 append_string(yytext, yyleng); 162 yylval.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 yylval.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 yylval.string = text; 180 return T_WORD_QUOTE; 181 } else 182 append_string(yytext, 1); 183 } 184 \n { 185 fprintf(stderr, 186 "%s:%d:warning: multi-line strings not supported\n", 187 zconf_curname(), zconf_lineno()); 188 BEGIN(INITIAL); 189 return T_EOL; 190 } 191 <<EOF>> { 192 BEGIN(INITIAL); 193 } 194 } 195 196 <HELP>{ 197 [ \t]+ { 198 ts = 0; 199 for (i = 0; i < yyleng; i++) { 200 if (yytext[i] == '\t') 201 ts = (ts & ~7) + 8; 202 else 203 ts++; 204 } 205 last_ts = ts; 206 if (first_ts) { 207 if (ts < first_ts) { 208 zconf_endhelp(); 209 return T_HELPTEXT; 210 } 211 ts -= first_ts; 212 while (ts > 8) { 213 append_string(" ", 8); 214 ts -= 8; 215 } 216 append_string(" ", ts); 217 } 218 } 219 [ \t]*\n/[^ \t\n] { 220 zconf_endhelp(); 221 return T_HELPTEXT; 222 } 223 [ \t]*\n { 224 append_string("\n", 1); 225 } 226 [^ \t\n].* { 227 while (yyleng) { 228 if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t')) 229 break; 230 yyleng--; 231 } 232 append_string(yytext, yyleng); 233 if (!first_ts) 234 first_ts = last_ts; 235 } 236 <<EOF>> { 237 zconf_endhelp(); 238 return T_HELPTEXT; 239 } 240 } 241 242 <<EOF>> { 243 if (current_file) { 244 zconf_endfile(); 245 return T_EOL; 246 } 247 fclose(yyin); 248 yyterminate(); 249 } 250 251 %% 252 void zconf_starthelp(void) 253 { 254 new_string(); 255 last_ts = first_ts = 0; 256 BEGIN(HELP); 257 } 258 259 static void zconf_endhelp(void) 260 { 261 yylval.string = text; 262 BEGIN(INITIAL); 263 } 264 265 266 /* 267 * Try to open specified file with following names: 268 * ./name 269 * $(srctree)/name 270 * The latter is used when srctree is separate from objtree 271 * when compiling the kernel. 272 * Return NULL if file is not found. 273 */ 274 FILE *zconf_fopen(const char *name) 275 { 276 char *env, fullname[PATH_MAX+1]; 277 FILE *f; 278 279 f = fopen(name, "r"); 280 if (!f && name != NULL && name[0] != '/') { 281 env = getenv(SRCTREE); 282 if (env) { 283 sprintf(fullname, "%s/%s", env, name); 284 f = fopen(fullname, "r"); 285 } 286 } 287 return f; 288 } 289 290 void zconf_initscan(const char *name) 291 { 292 yyin = zconf_fopen(name); 293 if (!yyin) { 294 fprintf(stderr, "can't find file %s\n", name); 295 exit(1); 296 } 297 298 current_buf = xmalloc(sizeof(*current_buf)); 299 memset(current_buf, 0, sizeof(*current_buf)); 300 301 current_file = file_lookup(name); 302 yylineno = 1; 303 } 304 305 void zconf_nextfile(const char *name) 306 { 307 struct file *iter; 308 struct file *file = file_lookup(name); 309 struct buffer *buf = xmalloc(sizeof(*buf)); 310 memset(buf, 0, sizeof(*buf)); 311 312 current_buf->state = YY_CURRENT_BUFFER; 313 yyin = zconf_fopen(file->name); 314 if (!yyin) { 315 fprintf(stderr, "%s:%d: can't open file \"%s\"\n", 316 zconf_curname(), zconf_lineno(), file->name); 317 exit(1); 318 } 319 yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE)); 320 buf->parent = current_buf; 321 current_buf = buf; 322 323 current_file->lineno = yylineno; 324 file->parent = current_file; 325 326 for (iter = current_file; iter; iter = iter->parent) { 327 if (!strcmp(iter->name, file->name)) { 328 fprintf(stderr, 329 "Recursive inclusion detected.\n" 330 "Inclusion path:\n" 331 " current file : %s\n", file->name); 332 iter = file; 333 do { 334 iter = iter->parent; 335 fprintf(stderr, " included from: %s:%d\n", 336 iter->name, iter->lineno - 1); 337 } while (strcmp(iter->name, file->name)); 338 exit(1); 339 } 340 } 341 342 yylineno = 1; 343 current_file = file; 344 } 345 346 static void zconf_endfile(void) 347 { 348 struct buffer *parent; 349 350 current_file = current_file->parent; 351 if (current_file) 352 yylineno = current_file->lineno; 353 354 parent = current_buf->parent; 355 if (parent) { 356 fclose(yyin); 357 yy_delete_buffer(YY_CURRENT_BUFFER); 358 yy_switch_to_buffer(parent->state); 359 } 360 free(current_buf); 361 current_buf = parent; 362 } 363 364 int zconf_lineno(void) 365 { 366 return current_pos.lineno; 367 } 368 369 const char *zconf_curname(void) 370 { 371 return current_pos.file ? current_pos.file->name : "<none>"; 372 } 373