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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4 */
5%option nostdinit noyywrap never-interactive full ecs
6%option 8bit nodefault yylineno
7%x ASSIGN_VAL HELP STRING
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#include "parser.tab.h"
19
20#define YY_DECL static int yylex1(void)
21
22#define START_STRSIZE 16
23
24static struct {
25 struct file *file;
26 int lineno;
27} current_pos;
28
29static int prev_prev_token = T_EOL;
30static int prev_token = T_EOL;
31static char *text;
32static int text_size, text_asize;
33
34struct buffer {
35 struct buffer *parent;
36 YY_BUFFER_STATE state;
37};
38
39struct buffer *current_buf;
40
41static int last_ts, first_ts;
42
43static char *expand_token(const char *in, size_t n);
44static void append_expanded_string(const char *in);
45static void zconf_endhelp(void);
46static void zconf_endfile(void);
47
48static void new_string(void)
49{
50 text = xmalloc(START_STRSIZE);
51 text_asize = START_STRSIZE;
52 text_size = 0;
53 *text = 0;
54}
55
56static void append_string(const char *str, int size)
57{
58 int new_size = text_size + size + 1;
59 if (new_size > text_asize) {
60 new_size += START_STRSIZE - 1;
61 new_size &= -START_STRSIZE;
62 text = xrealloc(text, new_size);
63 text_asize = new_size;
64 }
65 memcpy(text + text_size, str, size);
66 text_size += size;
67 text[text_size] = 0;
68}
69
70static void alloc_string(const char *str, int size)
71{
72 text = xmalloc(size + 1);
73 memcpy(text, str, size);
74 text[size] = 0;
75}
76
77static void warn_ignored_character(char chr)
78{
79 fprintf(stderr,
80 "%s:%d:warning: ignoring unsupported character '%c'\n",
81 current_file->name, yylineno, chr);
82}
83%}
84
85n [A-Za-z0-9_-]
86
87%%
88 int str = 0;
89 int ts, i;
90
91#.* /* ignore comment */
92[ \t]* /* whitespaces */
93\\\n /* escaped new line */
94\n return T_EOL;
95"allnoconfig_y" return T_ALLNOCONFIG_Y;
96"bool" return T_BOOL;
97"choice" return T_CHOICE;
98"comment" return T_COMMENT;
99"config" return T_CONFIG;
100"def_bool" return T_DEF_BOOL;
101"def_tristate" return T_DEF_TRISTATE;
102"default" return T_DEFAULT;
103"defconfig_list" return T_DEFCONFIG_LIST;
104"depends" return T_DEPENDS;
105"endchoice" return T_ENDCHOICE;
106"endif" return T_ENDIF;
107"endmenu" return T_ENDMENU;
108"help"|"---help---" return T_HELP;
109"hex" return T_HEX;
110"if" return T_IF;
111"imply" return T_IMPLY;
112"int" return T_INT;
113"mainmenu" return T_MAINMENU;
114"menu" return T_MENU;
115"menuconfig" return T_MENUCONFIG;
116"modules" return T_MODULES;
117"on" return T_ON;
118"option" return T_OPTION;
119"optional" return T_OPTIONAL;
120"prompt" return T_PROMPT;
121"range" return T_RANGE;
122"select" return T_SELECT;
123"source" return T_SOURCE;
124"string" return T_STRING;
125"tristate" return T_TRISTATE;
126"visible" return T_VISIBLE;
127"||" return T_OR;
128"&&" return T_AND;
129"=" return T_EQUAL;
130"!=" return T_UNEQUAL;
131"<" return T_LESS;
132"<=" return T_LESS_EQUAL;
133">" return T_GREATER;
134">=" return T_GREATER_EQUAL;
135"!" return T_NOT;
136"(" return T_OPEN_PAREN;
137")" return T_CLOSE_PAREN;
138":=" return T_COLON_EQUAL;
139"+=" return T_PLUS_EQUAL;
140\"|\' {
141 str = yytext[0];
142 new_string();
143 BEGIN(STRING);
144 }
145{n}+ {
146 alloc_string(yytext, yyleng);
147 yylval.string = text;
148 return T_WORD;
149 }
150({n}|$)+ {
151 /* this token includes at least one '$' */
152 yylval.string = expand_token(yytext, yyleng);
153 if (strlen(yylval.string))
154 return T_WORD;
155 free(yylval.string);
156 }
157. warn_ignored_character(*yytext);
158
159<ASSIGN_VAL>{
160 [^[:blank:]\n]+.* {
161 alloc_string(yytext, yyleng);
162 yylval.string = text;
163 return T_ASSIGN_VAL;
164 }
165 \n { BEGIN(INITIAL); return T_EOL; }
166 .
167}
168
169<STRING>{
170 "$".* append_expanded_string(yytext);
171 [^$'"\\\n]+ {
172 append_string(yytext, yyleng);
173 }
174 \\.? {
175 append_string(yytext + 1, yyleng - 1);
176 }
177 \'|\" {
178 if (str == yytext[0]) {
179 BEGIN(INITIAL);
180 yylval.string = text;
181 return T_WORD_QUOTE;
182 } else
183 append_string(yytext, 1);
184 }
185 \n {
186 fprintf(stderr,
187 "%s:%d:warning: multi-line strings not supported\n",
188 zconf_curname(), zconf_lineno());
189 unput('\n');
190 BEGIN(INITIAL);
191 yylval.string = text;
192 return T_WORD_QUOTE;
193 }
194 <<EOF>> {
195 BEGIN(INITIAL);
196 yylval.string = text;
197 return T_WORD_QUOTE;
198 }
199}
200
201<HELP>{
202 [ \t]+ {
203 ts = 0;
204 for (i = 0; i < yyleng; i++) {
205 if (yytext[i] == '\t')
206 ts = (ts & ~7) + 8;
207 else
208 ts++;
209 }
210 last_ts = ts;
211 if (first_ts) {
212 if (ts < first_ts) {
213 zconf_endhelp();
214 return T_HELPTEXT;
215 }
216 ts -= first_ts;
217 while (ts > 8) {
218 append_string(" ", 8);
219 ts -= 8;
220 }
221 append_string(" ", ts);
222 }
223 }
224 [ \t]*\n/[^ \t\n] {
225 zconf_endhelp();
226 return T_HELPTEXT;
227 }
228 [ \t]*\n {
229 append_string("\n", 1);
230 }
231 [^ \t\n].* {
232 while (yyleng) {
233 if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
234 break;
235 yyleng--;
236 }
237 append_string(yytext, yyleng);
238 if (!first_ts)
239 first_ts = last_ts;
240 }
241 <<EOF>> {
242 zconf_endhelp();
243 return T_HELPTEXT;
244 }
245}
246
247<<EOF>> {
248 BEGIN(INITIAL);
249
250 if (prev_token != T_EOL && prev_token != T_HELPTEXT)
251 fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
252 current_file->name, yylineno);
253
254 if (current_file) {
255 zconf_endfile();
256 return T_EOL;
257 }
258 fclose(yyin);
259 yyterminate();
260}
261
262%%
263
264/* second stage lexer */
265int yylex(void)
266{
267 int token;
268
269repeat:
270 token = yylex1();
271
272 if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
273 if (token == T_EOL) {
274 /* Do not pass unneeded T_EOL to the parser. */
275 goto repeat;
276 } else {
277 /*
278 * For the parser, update file/lineno at the first token
279 * of each statement. Generally, \n is a statement
280 * terminator in Kconfig, but it is not always true
281 * because \n could be escaped by a backslash.
282 */
283 current_pos.file = current_file;
284 current_pos.lineno = yylineno;
285 }
286 }
287
288 if (prev_prev_token == T_EOL && prev_token == T_WORD &&
289 (token == T_EQUAL || token == T_COLON_EQUAL || token == T_PLUS_EQUAL))
290 BEGIN(ASSIGN_VAL);
291
292 prev_prev_token = prev_token;
293 prev_token = token;
294
295 return token;
296}
297
298static char *expand_token(const char *in, size_t n)
299{
300 char *out;
301 int c;
302 char c2;
303 const char *rest, *end;
304
305 new_string();
306 append_string(in, n);
307
308 /* get the whole line because we do not know the end of token. */
309 while ((c = input()) != EOF) {
310 if (c == '\n') {
311 unput(c);
312 break;
313 }
314 c2 = c;
315 append_string(&c2, 1);
316 }
317
318 rest = text;
319 out = expand_one_token(&rest);
320
321 /* push back unused characters to the input stream */
322 end = rest + strlen(rest);
323 while (end > rest)
324 unput(*--end);
325
326 free(text);
327
328 return out;
329}
330
331static void append_expanded_string(const char *str)
332{
333 const char *end;
334 char *res;
335
336 str++;
337
338 res = expand_dollar(&str);
339
340 /* push back unused characters to the input stream */
341 end = str + strlen(str);
342 while (end > str)
343 unput(*--end);
344
345 append_string(res, strlen(res));
346
347 free(res);
348}
349
350void zconf_starthelp(void)
351{
352 new_string();
353 last_ts = first_ts = 0;
354 BEGIN(HELP);
355}
356
357static void zconf_endhelp(void)
358{
359 yylval.string = text;
360 BEGIN(INITIAL);
361}
362
363
364/*
365 * Try to open specified file with following names:
366 * ./name
367 * $(srctree)/name
368 * The latter is used when srctree is separate from objtree
369 * when compiling the kernel.
370 * Return NULL if file is not found.
371 */
372FILE *zconf_fopen(const char *name)
373{
374 char *env, fullname[PATH_MAX+1];
375 FILE *f;
376
377 f = fopen(name, "r");
378 if (!f && name != NULL && name[0] != '/') {
379 env = getenv(SRCTREE);
380 if (env) {
381 snprintf(fullname, sizeof(fullname),
382 "%s/%s", env, name);
383 f = fopen(fullname, "r");
384 }
385 }
386 return f;
387}
388
389void zconf_initscan(const char *name)
390{
391 yyin = zconf_fopen(name);
392 if (!yyin) {
393 fprintf(stderr, "can't find file %s\n", name);
394 exit(1);
395 }
396
397 current_buf = xmalloc(sizeof(*current_buf));
398 memset(current_buf, 0, sizeof(*current_buf));
399
400 current_file = file_lookup(name);
401 yylineno = 1;
402}
403
404void zconf_nextfile(const char *name)
405{
406 struct file *iter;
407 struct file *file = file_lookup(name);
408 struct buffer *buf = xmalloc(sizeof(*buf));
409 memset(buf, 0, sizeof(*buf));
410
411 current_buf->state = YY_CURRENT_BUFFER;
412 yyin = zconf_fopen(file->name);
413 if (!yyin) {
414 fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
415 zconf_curname(), zconf_lineno(), file->name);
416 exit(1);
417 }
418 yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
419 buf->parent = current_buf;
420 current_buf = buf;
421
422 current_file->lineno = yylineno;
423 file->parent = current_file;
424
425 for (iter = current_file; iter; iter = iter->parent) {
426 if (!strcmp(iter->name, file->name)) {
427 fprintf(stderr,
428 "Recursive inclusion detected.\n"
429 "Inclusion path:\n"
430 " current file : %s\n", file->name);
431 iter = file;
432 do {
433 iter = iter->parent;
434 fprintf(stderr, " included from: %s:%d\n",
435 iter->name, iter->lineno - 1);
436 } while (strcmp(iter->name, file->name));
437 exit(1);
438 }
439 }
440
441 yylineno = 1;
442 current_file = file;
443}
444
445static void zconf_endfile(void)
446{
447 struct buffer *parent;
448
449 current_file = current_file->parent;
450 if (current_file)
451 yylineno = current_file->lineno;
452
453 parent = current_buf->parent;
454 if (parent) {
455 fclose(yyin);
456 yy_delete_buffer(YY_CURRENT_BUFFER);
457 yy_switch_to_buffer(parent->state);
458 }
459 free(current_buf);
460 current_buf = parent;
461}
462
463int zconf_lineno(void)
464{
465 return current_pos.lineno;
466}
467
468const char *zconf_curname(void)
469{
470 return current_pos.file ? current_pos.file->name : "<none>";
471}
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
4 */
5%option nostdinit noyywrap never-interactive full ecs
6%option 8bit nodefault yylineno
7%x ASSIGN_VAL HELP STRING
8%{
9
10#include <assert.h>
11#include <limits.h>
12#include <stdio.h>
13#include <stdlib.h>
14#include <string.h>
15
16#include <xalloc.h>
17#include "lkc.h"
18#include "preprocess.h"
19
20#include "parser.tab.h"
21
22#define YY_DECL static int yylex1(void)
23
24#define START_STRSIZE 16
25
26/* The Kconfig file currently being parsed. */
27const char *cur_filename;
28
29/*
30 * The line number of the current statement. This does not match yylineno.
31 * yylineno is used by the lexer, while cur_lineno is used by the parser.
32 */
33int cur_lineno;
34
35static int prev_prev_token = T_EOL;
36static int prev_token = T_EOL;
37static char *text;
38static int text_size, text_asize;
39
40struct buffer {
41 struct buffer *parent;
42 YY_BUFFER_STATE state;
43 int yylineno;
44 const char *filename;
45 int source_lineno;
46};
47
48static struct buffer *current_buf;
49
50static int last_ts, first_ts;
51
52static char *expand_token(const char *in, size_t n);
53static void append_expanded_string(const char *in);
54static void zconf_endhelp(void);
55static void zconf_endfile(void);
56
57static void new_string(void)
58{
59 text = xmalloc(START_STRSIZE);
60 text_asize = START_STRSIZE;
61 text_size = 0;
62 *text = 0;
63}
64
65static void append_string(const char *str, int size)
66{
67 int new_size = text_size + size + 1;
68 if (new_size > text_asize) {
69 new_size += START_STRSIZE - 1;
70 new_size &= -START_STRSIZE;
71 text = xrealloc(text, new_size);
72 text_asize = new_size;
73 }
74 memcpy(text + text_size, str, size);
75 text_size += size;
76 text[text_size] = 0;
77}
78
79static void alloc_string(const char *str, int size)
80{
81 text = xmalloc(size + 1);
82 memcpy(text, str, size);
83 text[size] = 0;
84}
85
86static void warn_ignored_character(char chr)
87{
88 fprintf(stderr,
89 "%s:%d:warning: ignoring unsupported character '%c'\n",
90 cur_filename, yylineno, chr);
91}
92%}
93
94n [A-Za-z0-9_-]
95
96%%
97 char open_quote = 0;
98
99#.* /* ignore comment */
100[ \t]* /* whitespaces */
101\\\n /* escaped new line */
102\n return T_EOL;
103"bool" return T_BOOL;
104"choice" return T_CHOICE;
105"comment" return T_COMMENT;
106"config" return T_CONFIG;
107"def_bool" return T_DEF_BOOL;
108"def_tristate" return T_DEF_TRISTATE;
109"default" return T_DEFAULT;
110"depends" return T_DEPENDS;
111"endchoice" return T_ENDCHOICE;
112"endif" return T_ENDIF;
113"endmenu" return T_ENDMENU;
114"help" return T_HELP;
115"hex" return T_HEX;
116"if" return T_IF;
117"imply" return T_IMPLY;
118"int" return T_INT;
119"mainmenu" return T_MAINMENU;
120"menu" return T_MENU;
121"menuconfig" return T_MENUCONFIG;
122"modules" return T_MODULES;
123"on" return T_ON;
124"prompt" return T_PROMPT;
125"range" return T_RANGE;
126"select" return T_SELECT;
127"source" return T_SOURCE;
128"string" return T_STRING;
129"tristate" return T_TRISTATE;
130"visible" return T_VISIBLE;
131"||" return T_OR;
132"&&" return T_AND;
133"=" return T_EQUAL;
134"!=" return T_UNEQUAL;
135"<" return T_LESS;
136"<=" return T_LESS_EQUAL;
137">" return T_GREATER;
138">=" return T_GREATER_EQUAL;
139"!" return T_NOT;
140"(" return T_OPEN_PAREN;
141")" return T_CLOSE_PAREN;
142":=" return T_COLON_EQUAL;
143"+=" return T_PLUS_EQUAL;
144\"|\' {
145 open_quote = yytext[0];
146 new_string();
147 BEGIN(STRING);
148 }
149{n}+ {
150 alloc_string(yytext, yyleng);
151 yylval.string = text;
152 return T_WORD;
153 }
154({n}|$)+ {
155 /* this token includes at least one '$' */
156 yylval.string = expand_token(yytext, yyleng);
157 if (strlen(yylval.string))
158 return T_WORD;
159 free(yylval.string);
160 }
161. warn_ignored_character(*yytext);
162
163<ASSIGN_VAL>{
164 [^[:blank:]\n]+.* {
165 alloc_string(yytext, yyleng);
166 yylval.string = text;
167 return T_ASSIGN_VAL;
168 }
169 \n { BEGIN(INITIAL); return T_EOL; }
170 .
171}
172
173<STRING>{
174 "$".* append_expanded_string(yytext);
175 [^$'"\\\n]+ {
176 append_string(yytext, yyleng);
177 }
178 \\.? {
179 append_string(yytext + 1, yyleng - 1);
180 }
181 \'|\" {
182 if (open_quote == yytext[0]) {
183 BEGIN(INITIAL);
184 yylval.string = text;
185 return T_WORD_QUOTE;
186 } else
187 append_string(yytext, 1);
188 }
189 \n {
190 fprintf(stderr,
191 "%s:%d:warning: multi-line strings not supported\n",
192 cur_filename, cur_lineno);
193 unput('\n');
194 BEGIN(INITIAL);
195 yylval.string = text;
196 return T_WORD_QUOTE;
197 }
198 <<EOF>> {
199 BEGIN(INITIAL);
200 yylval.string = text;
201 return T_WORD_QUOTE;
202 }
203}
204
205<HELP>{
206 [ \t]+ {
207 int ts, i;
208
209 ts = 0;
210 for (i = 0; i < yyleng; i++) {
211 if (yytext[i] == '\t')
212 ts = (ts & ~7) + 8;
213 else
214 ts++;
215 }
216 last_ts = ts;
217 if (first_ts) {
218 if (ts < first_ts) {
219 zconf_endhelp();
220 return T_HELPTEXT;
221 }
222 ts -= first_ts;
223 while (ts > 8) {
224 append_string(" ", 8);
225 ts -= 8;
226 }
227 append_string(" ", ts);
228 }
229 }
230 [ \t]*\n/[^ \t\n] {
231 zconf_endhelp();
232 return T_HELPTEXT;
233 }
234 [ \t]*\n {
235 append_string("\n", 1);
236 }
237 [^ \t\n].* {
238 while (yyleng) {
239 if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
240 break;
241 yyleng--;
242 }
243 append_string(yytext, yyleng);
244 if (!first_ts)
245 first_ts = last_ts;
246 }
247 <<EOF>> {
248 zconf_endhelp();
249 return T_HELPTEXT;
250 }
251}
252
253<<EOF>> {
254 BEGIN(INITIAL);
255
256 if (prev_token != T_EOL && prev_token != T_HELPTEXT)
257 fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
258 cur_filename, yylineno);
259
260 if (current_buf) {
261 zconf_endfile();
262 return T_EOL;
263 }
264 fclose(yyin);
265 yyterminate();
266}
267
268%%
269
270/* second stage lexer */
271int yylex(void)
272{
273 int token;
274
275repeat:
276 token = yylex1();
277
278 if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
279 if (token == T_EOL)
280 /* Do not pass unneeded T_EOL to the parser. */
281 goto repeat;
282 else
283 /*
284 * For the parser, update lineno at the first token
285 * of each statement. Generally, \n is a statement
286 * terminator in Kconfig, but it is not always true
287 * because \n could be escaped by a backslash.
288 */
289 cur_lineno = yylineno;
290 }
291
292 if (prev_prev_token == T_EOL && prev_token == T_WORD &&
293 (token == T_EQUAL || token == T_COLON_EQUAL || token == T_PLUS_EQUAL))
294 BEGIN(ASSIGN_VAL);
295
296 prev_prev_token = prev_token;
297 prev_token = token;
298
299 return token;
300}
301
302static char *expand_token(const char *in, size_t n)
303{
304 char *out;
305 int c;
306 char c2;
307 const char *rest, *end;
308
309 new_string();
310 append_string(in, n);
311
312 /*
313 * get the whole line because we do not know the end of token.
314 * input() returns 0 (not EOF!) when it reachs the end of file.
315 */
316 while ((c = input()) != 0) {
317 if (c == '\n') {
318 unput(c);
319 break;
320 }
321 c2 = c;
322 append_string(&c2, 1);
323 }
324
325 rest = text;
326 out = expand_one_token(&rest);
327
328 /* push back unused characters to the input stream */
329 end = rest + strlen(rest);
330 while (end > rest)
331 unput(*--end);
332
333 free(text);
334
335 return out;
336}
337
338static void append_expanded_string(const char *str)
339{
340 const char *end;
341 char *res;
342
343 str++;
344
345 res = expand_dollar(&str);
346
347 /* push back unused characters to the input stream */
348 end = str + strlen(str);
349 while (end > str)
350 unput(*--end);
351
352 append_string(res, strlen(res));
353
354 free(res);
355}
356
357void zconf_starthelp(void)
358{
359 new_string();
360 last_ts = first_ts = 0;
361 BEGIN(HELP);
362}
363
364static void zconf_endhelp(void)
365{
366 yylval.string = text;
367 BEGIN(INITIAL);
368}
369
370
371/*
372 * Try to open specified file with following names:
373 * ./name
374 * $(srctree)/name
375 * The latter is used when srctree is separate from objtree
376 * when compiling the kernel.
377 * Return NULL if file is not found.
378 */
379FILE *zconf_fopen(const char *name)
380{
381 char *env, fullname[PATH_MAX+1];
382 FILE *f;
383
384 f = fopen(name, "r");
385 if (!f && name != NULL && name[0] != '/') {
386 env = getenv(SRCTREE);
387 if (env) {
388 snprintf(fullname, sizeof(fullname),
389 "%s/%s", env, name);
390 f = fopen(fullname, "r");
391 }
392 }
393 return f;
394}
395
396void zconf_initscan(const char *name)
397{
398 yyin = zconf_fopen(name);
399 if (!yyin) {
400 fprintf(stderr, "can't find file %s\n", name);
401 exit(1);
402 }
403
404 cur_filename = file_lookup(name);
405 yylineno = 1;
406}
407
408void zconf_nextfile(const char *name)
409{
410 struct buffer *buf = xmalloc(sizeof(*buf));
411 bool recur_include = false;
412
413 buf->state = YY_CURRENT_BUFFER;
414 buf->yylineno = yylineno;
415 buf->filename = cur_filename;
416 buf->source_lineno = cur_lineno;
417 buf->parent = current_buf;
418 current_buf = buf;
419 yyin = zconf_fopen(name);
420 if (!yyin) {
421 fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
422 cur_filename, cur_lineno, name);
423 exit(1);
424 }
425 yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
426
427 for (buf = current_buf; buf; buf = buf->parent) {
428 if (!strcmp(buf->filename, name))
429 recur_include = true;
430 }
431
432 if (recur_include) {
433 fprintf(stderr,
434 "Recursive inclusion detected.\n"
435 "Inclusion path:\n"
436 " current file : %s\n", name);
437
438 for (buf = current_buf; buf; buf = buf->parent)
439 fprintf(stderr, " included from: %s:%d\n",
440 buf->filename, buf->source_lineno);
441 exit(1);
442 }
443
444 yylineno = 1;
445 cur_filename = file_lookup(name);
446}
447
448static void zconf_endfile(void)
449{
450 struct buffer *tmp;
451
452 fclose(yyin);
453 yy_delete_buffer(YY_CURRENT_BUFFER);
454 yy_switch_to_buffer(current_buf->state);
455 yylineno = current_buf->yylineno;
456 cur_filename = current_buf->filename;
457 tmp = current_buf;
458 current_buf = current_buf->parent;
459 free(tmp);
460}