source: MondoRescue/branches/stable/mindi-busybox/scripts/kconfig/zconf.l@ 1770

%option backup nostdinit noyywrap never-interactive full ecs
%option 8bit backup nodefault perf-report perf-report
%x COMMAND HELP STRING PARAM
%{
/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define LKC_DIRECT_LINK
#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 void zconf_endhelp(void);
static void zconf_endfile(void);

void new_string(void)
{
    text = malloc(START_STRSIZE);
    text_asize = START_STRSIZE;
    text_size = 0;
    *text = 0;
}

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 = realloc(text, new_size);
        text_asize = new_size;
    }
    memcpy(text + text_size, str, size);
    text_size += size;
    text[text_size] = 0;
}

void alloc_string(const char *str, int size)
{
    text = malloc(size + 1);
    memcpy(text, str, size);
    text[size] = 0;
}
%}

ws  [ \n\t]
n   [A-Za-z0-9_]

%%
    int str = 0;
    int ts, i;

[ \t]*#.*\n |
[ \t]*\n    {
    current_file->lineno++;
    return T_EOL;
}
[ \t]*#.*


[ \t]+  {
    BEGIN(COMMAND);
}

.   {
    unput(yytext[0]);
    BEGIN(COMMAND);
}


<COMMAND>{
    {n}+    {
        struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
        BEGIN(PARAM);
        current_pos.file = current_file;
        current_pos.lineno = current_file->lineno;
        if (id && id->flags & TF_COMMAND) {
            zconflval.id = id;
            return id->token;
        }
        alloc_string(yytext, yyleng);
        zconflval.string = text;
        return T_WORD;
    }
    .
    \n  {
        BEGIN(INITIAL);
        current_file->lineno++;
        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;
    \"|\'   {
        str = yytext[0];
        new_string();
        BEGIN(STRING);
    }
    \n  BEGIN(INITIAL); current_file->lineno++; return T_EOL;
    --- /* ignore */
    ({n}|[-/.])+    {
        struct kconf_id *id = kconf_id_lookup(yytext, yyleng);
        if (id && id->flags & TF_PARAM) {
            zconflval.id = id;
            return id->token;
        }
        alloc_string(yytext, yyleng);
        zconflval.string = text;
        return T_WORD;
    }
    #.* /* comment */
    \\\n    current_file->lineno++;
    .
    <<EOF>> {
        BEGIN(INITIAL);
    }
}

<STRING>{
    [^'"\\\n]+/\n   {
        append_string(yytext, yyleng);
        zconflval.string = text;
        return T_WORD_QUOTE;
    }
    [^'"\\\n]+  {
        append_string(yytext, yyleng);
    }
    \\.?/\n {
        append_string(yytext + 1, yyleng - 1);
        zconflval.string = text;
        return T_WORD_QUOTE;
    }
    \\.?    {
        append_string(yytext + 1, yyleng - 1);
    }
    \'|\"   {
        if (str == yytext[0]) {
            BEGIN(PARAM);
            zconflval.string = text;
            return T_WORD_QUOTE;
        } else
            append_string(yytext, 1);
    }
    \n  {
        printf("%s:%d:warning: multi-line strings not supported\n", zconf_curname(), zconf_lineno());
        current_file->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] {
        current_file->lineno++;
        zconf_endhelp();
        return T_HELPTEXT;
    }
    [ \t]*\n    {
        current_file->lineno++;
        append_string("\n", 1);
    }
    [^ \t\n].* {
        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();
}

%%
void zconf_starthelp(void)
{
    new_string();
    last_ts = first_ts = 0;
    BEGIN(HELP);
}

static void zconf_endhelp(void)
{
    zconflval.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[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) {
        printf("can't find file %s\n", name);
        exit(1);
    }

    current_buf = malloc(sizeof(*current_buf));
    memset(current_buf, 0, sizeof(*current_buf));

    current_file = file_lookup(name);
    current_file->lineno = 1;
    current_file->flags = FILE_BUSY;
}

void zconf_nextfile(const char *name)
{
    struct file *file = file_lookup(name);
    struct buffer *buf = malloc(sizeof(*buf));
    memset(buf, 0, sizeof(*buf));

    current_buf->state = YY_CURRENT_BUFFER;
    yyin = zconf_fopen(name);
    if (!yyin) {
        printf("%s:%d: can't open file \"%s\"\n", zconf_curname(), zconf_lineno(), name);
        exit(1);
    }
    yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
    buf->parent = current_buf;
    current_buf = buf;

    if (file->flags & FILE_BUSY) {
        printf("recursive scan (%s)?\n", name);
        exit(1);
    }
    if (file->flags & FILE_SCANNED) {
        printf("file %s already scanned?\n", name);
        exit(1);
    }
    file->flags |= FILE_BUSY;
    file->lineno = 1;
    file->parent = current_file;
    current_file = file;
}

static void zconf_endfile(void)
{
    struct buffer *parent;

    current_file->flags |= FILE_SCANNED;
    current_file->flags &= ~FILE_BUSY;
    current_file = current_file->parent;

    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;
}

char *zconf_curname(void)
{
    return current_pos.file ? current_pos.file->name : "<none>";
}