wmenuifi.c

详细介绍了一篇关于pci开发的接口芯片

/*  CXL - Copyright (c) 1987-1989 by Mike Smedley - All Rights Reserved  */
/*  WMENUIFI.C  - finds item record in a menu structure  */

#include "cxlwin.h"

static struct _item_t *search_menu(struct _menu_t *menu,int tagid);

struct _item_t *wmenuifind(int tagid)
{
    register struct _item_t *item;

    /* check for existance of a menu */
    if(_winfo.cmenu==NULL) {
        _winfo.errno=W_NOMNUDEF;
        return(NULL);
    }

    /* start search process at root of menu structure */
    item=search_menu(_winfo.menu,tagid);

    /* return to caller */
    _winfo.errno=(item==NULL?W_NOTFOUND:W_NOERROR);
    return(item);
}

static struct _item_t *search_menu(struct _menu_t *menu,int tagid)
{
    register struct _item_t *witem,*item;

    /* do while more items in this menu */
    for(witem=menu->item;witem!=NULL;witem=witem->prev) {

        /* if tagid of found item matches item we're      */
        /* searching for, then return that item's address */
        if(witem->tagid==tagid) return(witem);

        /* if current item has a child menu, search it */
        if(witem->child!=NULL) {
            item=search_menu(witem->child,tagid);
            if(item!=NULL) return(item);
        }
    }

    /* return address of item found */
    return(witem);
}