linux/scripts/kconfig/zconf.l

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%option nostdinit noyywrap never-interactive full ecs
%option 8bit nodefault yylineno
%x COMMAND HELP STRING PARAM ASSIGN_VAL
%{
/*
* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
* Released under the terms of the GNU GPL v2.0.
*/
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "lkc.h"
#define START_STRSIZE 16
static struct {
struct file *file;
int lineno;
} current_pos;
static char *text;
static int text_size, text_asize;
struct buffer {
struct buffer *parent;
YY_BUFFER_STATE state;
};
struct buffer *current_buf;
static int last_ts, first_ts;
static char *expand_token(const char *in, size_t n);
static void append_expanded_string(const char *in);
static void zconf_endhelp(void);
static void zconf_endfile(void);
static void new_string(void)
{
text = xmalloc(START_STRSIZE);
text_asize = START_STRSIZE;
text_size = 0;
*text = 0;
}
static void append_string(const char *str, int size)
{
int new_size = text_size + size + 1;
if (new_size > text_asize) {
new_size += START_STRSIZE - 1;
new_size &= -START_STRSIZE;
text = xrealloc(text, new_size);
text_asize = new_size;
}
memcpy(text + text_size, str, size);
text_size += size;
text[text_size] = 0;
}
static void alloc_string(const char *str, int size)
{
text = xmalloc(size + 1);
memcpy(text, str, size);
text[size] = 0;
}
static void warn_ignored_character(char chr)
{
fprintf(stderr,
"%s:%d:warning: ignoring unsupported character '%c'\n",
zconf_curname(), zconf_lineno(), chr);
}
%}
n [A-Za-z0-9_-]
%%
int str = 0;
int ts, i;
[ \t]*#.*\n |
[ \t]*\n {
return T_EOL;
}
[ \t]*#.*
[ \t]+ {
BEGIN(COMMAND);
}
. {
unput(yytext[0]);
BEGIN(COMMAND);
}
<COMMAND>{
{n}+ {
const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
current_pos.file = current_file;
current_pos.lineno = yylineno;
if (id && id->flags & TF_COMMAND) {
BEGIN(PARAM);
yylval.id = id;
return id->token;
}
alloc_string(yytext, yyleng);
yylval.string = text;
return T_VARIABLE;
}
({n}|$)+ {
/* this token includes at least one '$' */
yylval.string = expand_token(yytext, yyleng);
if (strlen(yylval.string))
return T_VARIABLE;
free(yylval.string);
}
"=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_RECURSIVE; return T_ASSIGN; }
":=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_SIMPLE; return T_ASSIGN; }
"+=" { BEGIN(ASSIGN_VAL); yylval.flavor = VAR_APPEND; return T_ASSIGN; }
[[:blank:]]+
. warn_ignored_character(*yytext);
\n {
BEGIN(INITIAL);
return T_EOL;
}
}
<ASSIGN_VAL>{
[^[:blank:]\n]+.* {
alloc_string(yytext, yyleng);
yylval.string = text;
return T_ASSIGN_VAL;
}
\n { BEGIN(INITIAL); return T_EOL; }
.
}
<PARAM>{
"&&" return T_AND;
"||" return T_OR;
"(" return T_OPEN_PAREN;
")" return T_CLOSE_PAREN;
"!" return T_NOT;
"=" return T_EQUAL;
"!=" return T_UNEQUAL;
"<=" return T_LESS_EQUAL;
">=" return T_GREATER_EQUAL;
"<" return T_LESS;
">" return T_GREATER;
\"|\' {
str = yytext[0];
new_string();
BEGIN(STRING);
}
\n BEGIN(INITIAL); return T_EOL;
({n}|[/.])+ {
const struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
if (id && id->flags & TF_PARAM) {
yylval.id = id;
return id->token;
}
alloc_string(yytext, yyleng);
yylval.string = text;
return T_WORD;
}
({n}|[/.$])+ {
/* this token includes at least one '$' */
yylval.string = expand_token(yytext, yyleng);
if (strlen(yylval.string))
return T_WORD;
free(yylval.string);
}
#.* /* comment */
\\\n ;
[[:blank:]]+
. warn_ignored_character(*yytext);
<<EOF>> {
BEGIN(INITIAL);
}
}
<STRING>{
"$".* append_expanded_string(yytext);
[^$'"\\\n]+/\n {
append_string(yytext, yyleng);
yylval.string = text;
return T_WORD_QUOTE;
}
[^$'"\\\n]+ {
append_string(yytext, yyleng);
}
\\.?/\n {
append_string(yytext + 1, yyleng - 1);
yylval.string = text;
return T_WORD_QUOTE;
}
\\.? {
append_string(yytext + 1, yyleng - 1);
}
\'|\" {
if (str == yytext[0]) {
BEGIN(PARAM);
yylval.string = text;
return T_WORD_QUOTE;
} else
append_string(yytext, 1);
}
\n {
fprintf(stderr,
"%s:%d:warning: multi-line strings not supported\n",
zconf_curname(), zconf_lineno());
BEGIN(INITIAL);
return T_EOL;
}
<<EOF>> {
BEGIN(INITIAL);
}
}
<HELP>{
[ \t]+ {
ts = 0;
for (i = 0; i < yyleng; i++) {
if (yytext[i] == '\t')
ts = (ts & ~7) + 8;
else
ts++;
}
last_ts = ts;
if (first_ts) {
if (ts < first_ts) {
zconf_endhelp();
return T_HELPTEXT;
}
ts -= first_ts;
while (ts > 8) {
append_string(" ", 8);
ts -= 8;
}
append_string(" ", ts);
}
}
[ \t]*\n/[^ \t\n] {
zconf_endhelp();
return T_HELPTEXT;
}
[ \t]*\n {
append_string("\n", 1);
}
[^ \t\n].* {
while (yyleng) {
if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
break;
yyleng--;
}
append_string(yytext, yyleng);
if (!first_ts)
first_ts = last_ts;
}
<<EOF>> {
zconf_endhelp();
return T_HELPTEXT;
}
}
<<EOF>> {
if (current_file) {
zconf_endfile();
return T_EOL;
}
fclose(yyin);
yyterminate();
}
%%
static char *expand_token(const char *in, size_t n)
{
char *out;
int c;
char c2;
const char *rest, *end;
new_string();
append_string(in, n);
/* get the whole line because we do not know the end of token. */
while ((c = input()) != EOF) {
if (c == '\n') {
unput(c);
break;
}
c2 = c;
append_string(&c2, 1);
}
rest = text;
out = expand_one_token(&rest);
/* push back unused characters to the input stream */
end = rest + strlen(rest);
while (end > rest)
unput(*--end);
free(text);
return out;
}
static void append_expanded_string(const char *str)
{
const char *end;
char *res;
str++;
res = expand_dollar(&str);
/* push back unused characters to the input stream */
end = str + strlen(str);
while (end > str)
unput(*--end);
append_string(res, strlen(res));
free(res);
}
void zconf_starthelp(void)
{
new_string();
last_ts = first_ts = 0;
BEGIN(HELP);
}
static void zconf_endhelp(void)
{
yylval.string = text;
BEGIN(INITIAL);
}
/*
* Try to open specified file with following names:
* ./name
* $(srctree)/name
* The latter is used when srctree is separate from objtree
* when compiling the kernel.
* Return NULL if file is not found.
*/
FILE *zconf_fopen(const char *name)
{
char *env, fullname[PATH_MAX+1];
FILE *f;
f = fopen(name, "r");
if (!f && name != NULL && name[0] != '/') {
env = getenv(SRCTREE);
if (env) {
sprintf(fullname, "%s/%s", env, name);
f = fopen(fullname, "r");
}
}
return f;
}
void zconf_initscan(const char *name)
{
yyin = zconf_fopen(name);
if (!yyin) {
fprintf(stderr, "can't find file %s\n", name);
exit(1);
}
current_buf = xmalloc(sizeof(*current_buf));
memset(current_buf, 0, sizeof(*current_buf));
current_file = file_lookup(name);
yylineno = 1;
}
void zconf_nextfile(const char *name)
{
struct file *iter;
struct file *file = file_lookup(name);
struct buffer *buf = xmalloc(sizeof(*buf));
memset(buf, 0, sizeof(*buf));
current_buf->state = YY_CURRENT_BUFFER;
yyin = zconf_fopen(file->name);
if (!yyin) {
fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
zconf_curname(), zconf_lineno(), file->name);
exit(1);
}
yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
buf->parent = current_buf;
current_buf = buf;
current_file->lineno = yylineno;
file->parent = current_file;
for (iter = current_file; iter; iter = iter->parent) {
if (!strcmp(iter->name, file->name)) {
fprintf(stderr,
"Recursive inclusion detected.\n"
"Inclusion path:\n"
" current file : %s\n", file->name);
iter = file;
do {
iter = iter->parent;
fprintf(stderr, " included from: %s:%d\n",
iter->name, iter->lineno - 1);
} while (strcmp(iter->name, file->name));
exit(1);
}
}
yylineno = 1;
current_file = file;
}
static void zconf_endfile(void)
{
struct buffer *parent;
current_file = current_file->parent;
if (current_file)
yylineno = current_file->lineno;
parent = current_buf->parent;
if (parent) {
fclose(yyin);
yy_delete_buffer(YY_CURRENT_BUFFER);
yy_switch_to_buffer(parent->state);
}
free(current_buf);
current_buf = parent;
}
int zconf_lineno(void)
{
return current_pos.lineno;
}
const char *zconf_curname(void)
{
return current_pos.file ? current_pos.file->name : "<none>";
}