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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
16#include "lkc.h"
17#include "preprocess.h"
18
19#include "parser.tab.h"
20
21#define YY_DECL static int yylex1(void)
22
23#define START_STRSIZE 16
24
25/* The Kconfig file currently being parsed. */
26const char *cur_filename;
27
28/*
29 * The line number of the current statement. This does not match yylineno.
30 * yylineno is used by the lexer, while cur_lineno is used by the parser.
31 */
32int cur_lineno;
33
34static int prev_prev_token = T_EOL;
35static int prev_token = T_EOL;
36static char *text;
37static int text_size, text_asize;
38
39struct buffer {
40 struct buffer *parent;
41 YY_BUFFER_STATE state;
42 int yylineno;
43 const char *filename;
44 int source_lineno;
45};
46
47static struct buffer *current_buf;
48
49static int last_ts, first_ts;
50
51static char *expand_token(const char *in, size_t n);
52static void append_expanded_string(const char *in);
53static void zconf_endhelp(void);
54static void zconf_endfile(void);
55
56static void new_string(void)
57{
58 text = xmalloc(START_STRSIZE);
59 text_asize = START_STRSIZE;
60 text_size = 0;
61 *text = 0;
62}
63
64static void append_string(const char *str, int size)
65{
66 int new_size = text_size + size + 1;
67 if (new_size > text_asize) {
68 new_size += START_STRSIZE - 1;
69 new_size &= -START_STRSIZE;
70 text = xrealloc(text, new_size);
71 text_asize = new_size;
72 }
73 memcpy(text + text_size, str, size);
74 text_size += size;
75 text[text_size] = 0;
76}
77
78static void alloc_string(const char *str, int size)
79{
80 text = xmalloc(size + 1);
81 memcpy(text, str, size);
82 text[size] = 0;
83}
84
85static void warn_ignored_character(char chr)
86{
87 fprintf(stderr,
88 "%s:%d:warning: ignoring unsupported character '%c'\n",
89 cur_filename, yylineno, chr);
90}
91%}
92
93n [A-Za-z0-9_-]
94
95%%
96 char open_quote = 0;
97
98#.* /* ignore comment */
99[ \t]* /* whitespaces */
100\\\n /* escaped new line */
101\n return T_EOL;
102"bool" return T_BOOL;
103"choice" return T_CHOICE;
104"comment" return T_COMMENT;
105"config" return T_CONFIG;
106"def_bool" return T_DEF_BOOL;
107"def_tristate" return T_DEF_TRISTATE;
108"default" return T_DEFAULT;
109"depends" return T_DEPENDS;
110"endchoice" return T_ENDCHOICE;
111"endif" return T_ENDIF;
112"endmenu" return T_ENDMENU;
113"help" return T_HELP;
114"hex" return T_HEX;
115"if" return T_IF;
116"imply" return T_IMPLY;
117"int" return T_INT;
118"mainmenu" return T_MAINMENU;
119"menu" return T_MENU;
120"menuconfig" return T_MENUCONFIG;
121"modules" return T_MODULES;
122"on" return T_ON;
123"optional" return T_OPTIONAL;
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}