key.c

早期freebsd实现

	switch (ptr->type = ntype) {
	case XK_CMD:
	    ptr->val = *val;
	    break;
	case XK_STR:
	case XK_EXE:
	    ptr->val.str = strdup(val->str);
	    break;
	default:
	    abort();
	    break;
	}
    }
    else {
	/* still more chars to go */
	if (ptr->next == NULL)
	    ptr->next = node__get(*str);	/* setup new node */
	(void) node__try(ptr->next, str, val, ntype);
    }
    return 0;
}


/* node__delete():
 *	Delete node that matches str
 */
private int
node__delete(inptr, str)
    key_node_t **inptr;
    char   *str;
{
    key_node_t *ptr;
    key_node_t *prev_ptr = NULL;

    ptr = *inptr;

    if (ptr->ch != *str) {
	key_node_t *xm;

	for (xm = ptr; xm->sibling != NULL; xm = xm->sibling)
	    if (xm->sibling->ch == *str)
		break;
	if (xm->sibling == NULL)
	    return 0;
	prev_ptr = xm;
	ptr = xm->sibling;
    }

    if (*++str == '\0') {
	/* we're there */
	if (prev_ptr == NULL)
	    *inptr = ptr->sibling;
	else
	    prev_ptr->sibling = ptr->sibling;
	ptr->sibling = NULL;
	node__put(ptr);
	return 1;
    }
    else if (ptr->next != NULL && node__delete(&ptr->next, str) == 1) {
	if (ptr->next != NULL)
	    return 0;
	if (prev_ptr == NULL)
	    *inptr = ptr->sibling;
	else
	    prev_ptr->sibling = ptr->sibling;
	ptr->sibling = NULL;
	node__put(ptr);
	return 1;
    }
    else {
	return 0;
    }
}

/* node__put():
 *	Puts a tree of nodes onto free list using free(3).
 */
private void
node__put(ptr)
    key_node_t *ptr;
{
    if (ptr == NULL)
	return;

    if (ptr->next != NULL) {
	node__put(ptr->next);
	ptr->next = NULL;
    }

    node__put(ptr->sibling);

    switch (ptr->type) {
    case XK_CMD:
    case XK_NOD:
	break;
    case XK_EXE:
    case XK_STR:
	if (ptr->val.str != NULL)
	    el_free((ptr_t) ptr->val.str);
	break;
    default:
	abort();
	break;
    }
    el_free((ptr_t) ptr);
}


/* node__get():
 *	Returns pointer to an key_node_t for ch.
 */
private key_node_t *
node__get(ch)
    int    ch;
{
    key_node_t *ptr;

    ptr = (key_node_t *) el_malloc((size_t) sizeof(key_node_t));
    ptr->ch = ch;
    ptr->type = XK_NOD;
    ptr->val.str = NULL;
    ptr->next = NULL;
    ptr->sibling = NULL;
    return ptr;
}



/* node_lookup():
 *	look for the str starting at node ptr.
 *	Print if last node
 */
private int
node_lookup(el, str, ptr, cnt)
    EditLine   *el;
    char       *str;
    key_node_t *ptr;
    int         cnt;
{
    int     ncnt;

    if (ptr == NULL)
	return -1;		/* cannot have null ptr */

    if (*str == 0) {
	/* no more chars in str.  node_enum from here. */
	(void) node_enum(el, ptr, cnt);
	return 0;
    }
    else {
	/* If match put this char into el->el_key.buf.  Recurse */
	if (ptr->ch == *str) {
	    /* match found */
	    ncnt = key__decode_char(el->el_key.buf, cnt, 
				    (unsigned char) ptr->ch);
	    if (ptr->next != NULL)
		/* not yet at leaf */
		return node_lookup(el, str + 1, ptr->next, ncnt + 1);
	    else {
		/* next node is null so key should be complete */
		if (str[1] == 0) {
		    el->el_key.buf[ncnt + 1] = '"';
		    el->el_key.buf[ncnt + 2] = '\0';
		    key_kprint(el, el->el_key.buf, &ptr->val, ptr->type);
		    return 0;
		}
		else
		    return -1;/* mismatch -- str still has chars */
	    }
	}
	else {
	    /* no match found try sibling */
	    if (ptr->sibling)
		return node_lookup(el, str, ptr->sibling, cnt);
	    else
		return -1;
	}
    }
}


/* node_enum():
 *	Traverse the node printing the characters it is bound in buffer
 */
private int
node_enum(el, ptr, cnt)
    EditLine *el;
    key_node_t *ptr;
    int     cnt;
{
    int     ncnt;

    if (cnt >= KEY_BUFSIZ - 5) {	/* buffer too small */
	el->el_key.buf[++cnt] = '"';
	el->el_key.buf[++cnt] = '\0';
	(void) fprintf(el->el_errfile, 
		    "Some extended keys too long for internal print buffer");
	(void) fprintf(el->el_errfile, " \"%s...\"\n", el->el_key.buf);
	return 0;
    }

    if (ptr == NULL) {
#ifdef DEBUG_EDIT
	(void) fprintf(el->el_errfile, "node_enum: BUG!! Null ptr passed\n!");
#endif
	return -1;
    }

    /* put this char at end of str */
    ncnt = key__decode_char(el->el_key.buf, cnt, (unsigned char) ptr->ch);
    if (ptr->next == NULL) {
	/* print this key and function */
	el->el_key.buf[ncnt + 1] = '"';
	el->el_key.buf[ncnt + 2] = '\0';
	key_kprint(el, el->el_key.buf, &ptr->val, ptr->type);
    }
    else
	(void) node_enum(el, ptr->next, ncnt + 1);

    /* go to sibling if there is one */
    if (ptr->sibling)
	(void) node_enum(el, ptr->sibling, cnt);
    return 0;
}


/* key_kprint():
 *	Print the specified key and its associated
 *	function specified by val
 */
protected void
key_kprint(el, key, val, ntype)
    EditLine      *el;
    char          *key;
    key_value_t   *val;
    int            ntype;
{
    el_bindings_t *fp;
    char unparsbuf[EL_BUFSIZ];
    static char *fmt = "%-15s->  %s\n";

    if (val != NULL)
	switch (ntype) {
	case XK_STR:
	case XK_EXE:
	    (void) fprintf(el->el_errfile, fmt, key, 
			   key__decode_str(val->str, unparsbuf, 
					      ntype == XK_STR ? "\"\"" : "[]"));
	    break;
	case XK_CMD:
	    for (fp = el->el_map.help; fp->name; fp++) 
		if (val->cmd == fp->func) {
		    (void) fprintf(el->el_errfile, fmt, key, fp->name);
		    break;
		}
#ifdef DEBUG_KEY
	    if (fp->name == NULL) 
		(void) fprintf(el->el_errfile, "BUG! Command not found.\n");
#endif

	    break;
	default:
	    abort();
	    break;
	}
    else
	(void) fprintf(el->el_errfile, fmt, key, "no input");
}


/* key__decode_char():
 *	Put a printable form of char in buf.
 */
private int
key__decode_char(buf, cnt, ch)
    char *buf;
    int   cnt, ch;
{
    if (ch == 0) {
	buf[cnt++] = '^';
	buf[cnt] = '@';
	return cnt;
    }

    if (iscntrl(ch)) {
	buf[cnt++] = '^';
	if (ch == '\177')
	    buf[cnt] = '?';
	else
	    buf[cnt] = ch | 0100;
    }
    else if (ch == '^') {
	buf[cnt++] = '\\';
	buf[cnt] = '^';
    }
    else if (ch == '\\') {
	buf[cnt++] = '\\';
	buf[cnt] = '\\';
    }
    else if (ch == ' ' || (isprint(ch) && !isspace(ch))) {
	buf[cnt] = ch;
    }
    else {
	buf[cnt++] = '\\';
	buf[cnt++] = ((ch >> 6) & 7) + '0';
	buf[cnt++] = ((ch >> 3) & 7) + '0';
	buf[cnt] = (ch & 7) + '0';
    }
    return cnt;
}

/* key__decode_str():
 *	Make a printable version of the ey
 */
protected char *
key__decode_str(str, buf, sep)
    char   *str;
    char   *buf;
    char   *sep;
{
    char *b, *p;

    b = buf;
    if (sep[0] != '\0')
	*b++ = sep[0];
    if (*str == 0) {
	*b++ = '^';
	*b++ = '@';
	if (sep[0] != '\0' && sep[1] != '\0')
	    *b++ = sep[1];
	*b++ = 0;
	return buf;
    }

    for (p = str; *p != 0; p++) {
	if (iscntrl((unsigned char) *p)) {
	    *b++ = '^';
	    if (*p == '\177')
		*b++ = '?';
	    else
		*b++ = *p | 0100;
	}
	else if (*p == '^' || *p == '\\') {
	    *b++ = '\\';
	    *b++ = *p;
	}
	else if (*p == ' ' || (isprint((unsigned char) *p) && 
			       !isspace((unsigned char) *p))) {
	    *b++ = *p;
	}
	else {
	    *b++ = '\\';
	    *b++ = ((*p >> 6) & 7) + '0';
	    *b++ = ((*p >> 3) & 7) + '0';
	    *b++ = (*p & 7) + '0';
	}
    }
    if (sep[0] != '\0' && sep[1] != '\0')
	*b++ = sep[1];
    *b++ = 0;
    return buf;			/* should check for overflow */
}