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/* add a wide char */
ST_FUNC void cstr_wccat(CString *cstr, int ch)
{
    int size;
    size = cstr->size + sizeof(nwchar_t);
    if (size > cstr->size_allocated)
        cstr_realloc(cstr, size);
    *(nwchar_t *)(((unsigned char *)cstr->data) + size - sizeof(nwchar_t)) = ch;
    cstr->size = size;
}

ST_FUNC void cstr_new(CString *cstr)
{
    memset(cstr, 0, sizeof(CString));
}

/* free string and reset it to NULL */
ST_FUNC void cstr_free(CString *cstr)
{
    tal_free(cstr_alloc, cstr->data);
    cstr_new(cstr);
}

/* reset string to empty */
ST_FUNC void cstr_reset(CString *cstr)
{
    cstr->size = 0;
}

/* XXX: unicode ? */
static void add_char(CString *cstr, int c)
{
    if (c == '\'' || c == '\"' || c == '\\') {
        /* XXX: could be more precise if char or string */
        cstr_ccat(cstr, '\\');
    }
    if (c >= 32 && c <= 126) {
        cstr_ccat(cstr, c);
    } else {
        cstr_ccat(cstr, '\\');
        if (c == '\n') {
            cstr_ccat(cstr, 'n');
        } else {
            cstr_ccat(cstr, '0' + ((c >> 6) & 7));
            cstr_ccat(cstr, '0' + ((c >> 3) & 7));
            cstr_ccat(cstr, '0' + (c & 7));
        }
    }
}

/* ------------------------------------------------------------------------- */
/* allocate a new token */
static TokenSym *tok_alloc_new(TokenSym **pts, const char *str, int len)
{
    TokenSym *ts, **ptable;
    int i;

    if (tok_ident >= SYM_FIRST_ANOM) 
        tcc_error("memory full (symbols)");

    /* expand token table if needed */
    i = tok_ident - TOK_IDENT;
    if ((i % TOK_ALLOC_INCR) == 0) {
        ptable = tcc_realloc(table_ident, (i + TOK_ALLOC_INCR) * sizeof(TokenSym *));
        table_ident = ptable;
    }

    ts = tal_realloc(toksym_alloc, 0, sizeof(TokenSym) + len);
    table_ident[i] = ts;
    ts->tok = tok_ident++;
    ts->sym_define = NULL;
    ts->sym_label = NULL;
    ts->sym_struct = NULL;
    ts->sym_identifier = NULL;
    ts->len = len;
    ts->hash_next = NULL;
    memcpy(ts->str, str, len);
    ts->str[len] = '\0';
    *pts = ts;
    return ts;
}

#define TOK_HASH_INIT 1
#define TOK_HASH_FUNC(h, c) ((h) + ((h) << 5) + ((h) >> 27) + (c))


/* find a token and add it if not found */
ST_FUNC TokenSym *tok_alloc(const char *str, int len)
{
    TokenSym *ts, **pts;
    int i;
    unsigned int h;
    
    h = TOK_HASH_INIT;
    for(i=0;i<len;i++)
        h = TOK_HASH_FUNC(h, ((unsigned char *)str)[i]);
    h &= (TOK_HASH_SIZE - 1);

    pts = &hash_ident[h];
    for(;;) {
        ts = *pts;
        if (!ts)
            break;
        if (ts->len == len && !memcmp(ts->str, str, len))
            return ts;
        pts = &(ts->hash_next);
    }
    return tok_alloc_new(pts, str, len);
}

/* #ifdef CONFIG_TCC_EXSYMTAB */
/* Almost identical to above: Returns a pointer to the hash_next which either
 * points to the token (if found) or points to null. If the dereferenced value
 * is null, then this pointer itself can be passed to tok_alloc_new; if the
 * dereferenced value is not null, it is already present and ready for use. */
ST_FUNC TokenSym** symtab_tok_find(const char *str, int len)
{
    TokenSym *ts, **pts;
    int i;
    unsigned int h;