Root/scripts/kconfig/zconf.l

1%option backup nostdinit noyywrap never-interactive full ecs
2%option 8bit backup nodefault perf-report perf-report
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#define LKC_DIRECT_LINK
18#include "lkc.h"
19
20#define START_STRSIZE 16
21
22static struct {
23    struct file *file;
24    int lineno;
25} current_pos;
26
27static char *text;
28static int text_size, text_asize;
29
30struct buffer {
31        struct buffer *parent;
32        YY_BUFFER_STATE state;
33};
34
35struct buffer *current_buf;
36
37static int last_ts, first_ts;
38
39static void zconf_endhelp(void);
40static void zconf_endfile(void);
41
42static void new_string(void)
43{
44    text = malloc(START_STRSIZE);
45    text_asize = START_STRSIZE;
46    text_size = 0;
47    *text = 0;
48}
49
50static void append_string(const char *str, int size)
51{
52    int new_size = text_size + size + 1;
53    if (new_size > text_asize) {
54        new_size += START_STRSIZE - 1;
55        new_size &= -START_STRSIZE;
56        text = realloc(text, new_size);
57        text_asize = new_size;
58    }
59    memcpy(text + text_size, str, size);
60    text_size += size;
61    text[text_size] = 0;
62}
63
64static void alloc_string(const char *str, int size)
65{
66    text = malloc(size + 1);
67    memcpy(text, str, size);
68    text[size] = 0;
69}
70%}
71
72ws [ \n\t]
73n [A-Za-z0-9_]
74
75%%
76    int str = 0;
77    int ts, i;
78
79[ \t]*#.*\n |
80[ \t]*\n {
81    current_file->lineno++;
82    return T_EOL;
83}
84[ \t]*#.*
85
86
87[ \t]+ {
88    BEGIN(COMMAND);
89}
90
91. {
92    unput(yytext[0]);
93    BEGIN(COMMAND);
94}
95
96
97<COMMAND>{
98    {n}+ {
99        struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
100        BEGIN(PARAM);
101        current_pos.file = current_file;
102        current_pos.lineno = current_file->lineno;
103        if (id && id->flags & TF_COMMAND) {
104            zconflval.id = id;
105            return id->token;
106        }
107        alloc_string(yytext, yyleng);
108        zconflval.string = text;
109        return T_WORD;
110    }
111    .
112    \n {
113        BEGIN(INITIAL);
114        current_file->lineno++;
115        return T_EOL;
116    }
117}
118
119<PARAM>{
120    "&&" return T_AND;
121    "||" return T_OR;
122    "(" return T_OPEN_PAREN;
123    ")" return T_CLOSE_PAREN;
124    "!" return T_NOT;
125    "=" return T_EQUAL;
126    "!=" return T_UNEQUAL;
127    \"|\' {
128        str = yytext[0];
129        new_string();
130        BEGIN(STRING);
131    }
132    \n BEGIN(INITIAL); current_file->lineno++; return T_EOL;
133    --- /* ignore */
134    ({n}|[-/.])+ {
135        struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
136        if (id && id->flags & TF_PARAM) {
137            zconflval.id = id;
138            return id->token;
139        }
140        alloc_string(yytext, yyleng);
141        zconflval.string = text;
142        return T_WORD;
143    }
144    #.* /* comment */
145    \\\n current_file->lineno++;
146    .
147    <<EOF>> {
148        BEGIN(INITIAL);
149    }
150}
151
152<STRING>{
153    [^'"\\\n]+/\n {
154        append_string(yytext, yyleng);
155        zconflval.string = text;
156        return T_WORD_QUOTE;
157    }
158    [^'"\\\n]+ {
159        append_string(yytext, yyleng);
160    }
161    \\.?/\n {
162        append_string(yytext + 1, yyleng - 1);
163        zconflval.string = text;
164        return T_WORD_QUOTE;
165    }
166    \\.? {
167        append_string(yytext + 1, yyleng - 1);
168    }
169    \'|\" {
170        if (str == yytext[0]) {
171            BEGIN(PARAM);
172            zconflval.string = text;
173            return T_WORD_QUOTE;
174        } else
175            append_string(yytext, 1);
176    }
177    \n {
178        printf("%s:%d:warning: multi-line strings not supported\n", zconf_curname(), zconf_lineno());
179        current_file->lineno++;
180        BEGIN(INITIAL);
181        return T_EOL;
182    }
183    <<EOF>> {
184        BEGIN(INITIAL);
185    }
186}
187
188<HELP>{
189    [ \t]+ {
190        ts = 0;
191        for (i = 0; i < yyleng; i++) {
192            if (yytext[i] == '\t')
193                ts = (ts & ~7) + 8;
194            else
195                ts++;
196        }
197        last_ts = ts;
198        if (first_ts) {
199            if (ts < first_ts) {
200                zconf_endhelp();
201                return T_HELPTEXT;
202            }
203            ts -= first_ts;
204            while (ts > 8) {
205                append_string(" ", 8);
206                ts -= 8;
207            }
208            append_string(" ", ts);
209        }
210    }
211    [ \t]*\n/[^ \t\n] {
212        current_file->lineno++;
213        zconf_endhelp();
214        return T_HELPTEXT;
215    }
216    [ \t]*\n {
217        current_file->lineno++;
218        append_string("\n", 1);
219    }
220    [^ \t\n].* {
221        while (yyleng) {
222            if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
223                break;
224            yyleng--;
225        }
226        append_string(yytext, yyleng);
227        if (!first_ts)
228            first_ts = last_ts;
229    }
230    <<EOF>> {
231        zconf_endhelp();
232        return T_HELPTEXT;
233    }
234}
235
236<<EOF>> {
237    if (current_file) {
238        zconf_endfile();
239        return T_EOL;
240    }
241    fclose(yyin);
242    yyterminate();
243}
244
245%%
246void zconf_starthelp(void)
247{
248    new_string();
249    last_ts = first_ts = 0;
250    BEGIN(HELP);
251}
252
253static void zconf_endhelp(void)
254{
255    zconflval.string = text;
256    BEGIN(INITIAL);
257}
258
259
260/*
261 * Try to open specified file with following names:
262 * ./name
263 * $(srctree)/name
264 * The latter is used when srctree is separate from objtree
265 * when compiling the kernel.
266 * Return NULL if file is not found.
267 */
268FILE *zconf_fopen(const char *name)
269{
270    char *env, fullname[PATH_MAX+1];
271    FILE *f;
272
273    f = fopen(name, "r");
274    if (!f && name != NULL && name[0] != '/') {
275        env = getenv(SRCTREE);
276        if (env) {
277            sprintf(fullname, "%s/%s", env, name);
278            f = fopen(fullname, "r");
279        }
280    }
281    return f;
282}
283
284void zconf_initscan(const char *name)
285{
286    yyin = zconf_fopen(name);
287    if (!yyin) {
288        printf("can't find file %s\n", name);
289        exit(1);
290    }
291
292    current_buf = malloc(sizeof(*current_buf));
293    memset(current_buf, 0, sizeof(*current_buf));
294
295    current_file = file_lookup(name);
296    current_file->lineno = 1;
297}
298
299void zconf_nextfile(const char *name)
300{
301    struct file *iter;
302    struct file *file = file_lookup(name);
303    struct buffer *buf = malloc(sizeof(*buf));
304    memset(buf, 0, sizeof(*buf));
305
306    current_buf->state = YY_CURRENT_BUFFER;
307    yyin = zconf_fopen(file->name);
308    if (!yyin) {
309        printf("%s:%d: can't open file \"%s\"\n",
310            zconf_curname(), zconf_lineno(), file->name);
311        exit(1);
312    }
313    yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
314    buf->parent = current_buf;
315    current_buf = buf;
316
317    for (iter = current_file->parent; iter; iter = iter->parent ) {
318        if (!strcmp(current_file->name,iter->name) ) {
319            printf("%s:%d: recursive inclusion detected. "
320                   "Inclusion path:\n current file : '%s'\n",
321                   zconf_curname(), zconf_lineno(),
322                   zconf_curname());
323            iter = current_file->parent;
324            while (iter && \
325                   strcmp(iter->name,current_file->name)) {
326                printf(" included from: '%s:%d'\n",
327                       iter->name, iter->lineno-1);
328                iter = iter->parent;
329            }
330            if (iter)
331                printf(" included from: '%s:%d'\n",
332                       iter->name, iter->lineno+1);
333            exit(1);
334        }
335    }
336    file->lineno = 1;
337    file->parent = current_file;
338    current_file = file;
339}
340
341static void zconf_endfile(void)
342{
343    struct buffer *parent;
344
345    current_file = current_file->parent;
346
347    parent = current_buf->parent;
348    if (parent) {
349        fclose(yyin);
350        yy_delete_buffer(YY_CURRENT_BUFFER);
351        yy_switch_to_buffer(parent->state);
352    }
353    free(current_buf);
354    current_buf = parent;
355}
356
357int zconf_lineno(void)
358{
359    return current_pos.lineno;
360}
361
362const char *zconf_curname(void)
363{
364    return current_pos.file ? current_pos.file->name : "<none>";
365}
366

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