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
new_string(void)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
append_string(const char * str,int size)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
alloc_string(const char * str,int size)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
warn_ignored_character(char chr)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