rt-thread/components/finsh/cmd.c

/*
 *  RT-Thread finsh shell commands
 *
 * COPYRIGHT (C) 2006 - 2013, RT-Thread Development Team
 *
 *  This file is part of RT-Thread (http://www.rt-thread.org)
 *  Maintainer: bernard.xiong <bernard.xiong at gmail.com>
 *
 *  All rights reserved.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-04-30     Bernard      first implementation
 * 2006-05-04     Bernard      add list_thread,
 *                                 list_sem,
 *                                 list_timer
 * 2006-05-20     Bernard      add list_mutex,
 *                                 list_mailbox,
 *                                 list_msgqueue,
 *                                 list_event,
 *                                 list_fevent,
 *                                 list_mempool
 * 2006-06-03     Bernard      display stack information in list_thread
 * 2006-08-10     Bernard      change version to invoke rt_show_version
 * 2008-09-10     Bernard      update the list function for finsh syscall
 *                                 list and sysvar list
 * 2009-05-30     Bernard      add list_device
 * 2010-04-21     yi.qiu       add list_module
 * 2012-04-29     goprife      improve the command line auto-complete feature.
 * 2012-06-02     lgnq         add list_memheap
 * 2012-10-22     Bernard      add MS VC++ patch.
 */

#include <rtthread.h>
#include "finsh.h"

rt_inline unsigned int rt_list_len(const rt_list_t *l)
{
    unsigned int len = 0;
    const rt_list_t *p = l;
    while (p->next != l)
    {
        p = p->next;
        len ++;
    }

    return len;
}

long hello(void)
{
    rt_kprintf("Hello RT-Thread!\n");

    return 0;
}
FINSH_FUNCTION_EXPORT(hello, say hello world);

extern void rt_show_version(void);
long version(void)
{
    rt_show_version();

    return 0;
}
FINSH_FUNCTION_EXPORT(version, show RT-Thread version information);

extern struct rt_object_information rt_object_container[];

static long _list_thread(struct rt_list_node *list)
{
    struct rt_thread *thread;
    struct rt_list_node *node;
    rt_uint8_t *ptr;

    rt_kprintf(" thread  pri  status      sp     stack size max used   left tick  error\n");
    rt_kprintf("-------- ---- ------- ---------- ---------- ---------- ---------- ---\n");
    for (node = list->next; node != list; node = node->next)
    {
        thread = rt_list_entry(node, struct rt_thread, list);
        rt_kprintf("%-8.*s 0x%02x", RT_NAME_MAX, thread->name, thread->current_priority);

        if (thread->stat == RT_THREAD_READY)        rt_kprintf(" ready  ");
        else if (thread->stat == RT_THREAD_SUSPEND) rt_kprintf(" suspend");
        else if (thread->stat == RT_THREAD_INIT)    rt_kprintf(" init   ");
        else if (thread->stat == RT_THREAD_CLOSE)   rt_kprintf(" close  ");

        ptr = (rt_uint8_t*)thread->stack_addr;
        while (*ptr == '#')ptr ++;

        rt_kprintf(" 0x%08x 0x%08x 0x%08x 0x%08x %03d\n",
            thread->stack_size + ((rt_uint32_t)thread->stack_addr - (rt_uint32_t)thread->sp),
            thread->stack_size,
            thread->stack_size - ((rt_uint32_t) ptr - (rt_uint32_t)thread->stack_addr),
            thread->remaining_tick,
            thread->error);
    }
	
    return 0;
}

long list_thread(void)
{
    return _list_thread(&rt_object_container[RT_Object_Class_Thread].object_list);
}
FINSH_FUNCTION_EXPORT(list_thread, list thread);

static void show_wait_queue(struct rt_list_node *list)
{
    struct rt_thread *thread;
    struct rt_list_node *node;

    for (node = list->next; node != list; node = node->next)
    {
        thread = rt_list_entry(node, struct rt_thread, tlist);
        rt_kprintf("%s", thread->name);

        if (node->next != list)
            rt_kprintf("/");
    }
}

#ifdef RT_USING_SEMAPHORE
static long _list_sem(struct rt_list_node *list)
{
    struct rt_semaphore *sem;
    struct rt_list_node *node;

    rt_kprintf("semaphore v   suspend thread\n");
    rt_kprintf("--------  --- --------------\n");
    for (node = list->next; node != list; node = node->next)
    {
        sem = (struct rt_semaphore *)(rt_list_entry(node, struct rt_object, list));
        if (!rt_list_isempty(&sem->parent.suspend_thread))
        {
            rt_kprintf("%-8.*s  %03d %d:", 
                       RT_NAME_MAX,
                       sem->parent.parent.name,
                       sem->value,
                       rt_list_len(&sem->parent.suspend_thread));
            show_wait_queue(&(sem->parent.suspend_thread));
            rt_kprintf("\n");
        }
        else
        {
            rt_kprintf("%-8.*s  %03d %d\n",
                       RT_NAME_MAX,
                       sem->parent.parent.name,
                       sem->value,
                       rt_list_len(&sem->parent.suspend_thread));
        }
    }

    return 0;
}

long list_sem(void)
{
    return _list_sem(&rt_object_container[RT_Object_Class_Semaphore].object_list);
}
FINSH_FUNCTION_EXPORT(list_sem, list semaphone in system)
#endif

#ifdef RT_USING_EVENT
static long _list_event(struct rt_list_node *list)
{
    struct rt_event *e;
    struct rt_list_node *node;

    rt_kprintf("event    set        suspend thread\n");
    rt_kprintf("-------- ---------- --------------\n");
    for (node = list->next; node != list; node = node->next)
    {
        e = (struct rt_event *)(rt_list_entry(node, struct rt_object, list));
        if (!rt_list_isempty(&e->parent.suspend_thread))
        {
            rt_kprintf("%-8.*s  0x%08x %03d:",
                       RT_NAME_MAX,
                       e->parent.parent.name,
                       e->set,
                       rt_list_len(&e->parent.suspend_thread));
            show_wait_queue(&(e->parent.suspend_thread));
            rt_kprintf("\n");
        }
        else
        {
            rt_kprintf("%-8.*s  0x%08x 0\n",
                       RT_NAME_MAX, e->parent.parent.name, e->set);
        }
    }

    return 0;
}

long list_event(void)
{
    return _list_event(&rt_object_container[RT_Object_Class_Event].object_list);
}
FINSH_FUNCTION_EXPORT(list_event, list event in system)
#endif

#ifdef RT_USING_MUTEX
static long _list_mutex(struct rt_list_node *list)
{
    struct rt_mutex *m;
    struct rt_list_node *node;

    rt_kprintf("mutex    owner    hold suspend thread\n");
    rt_kprintf("-------- -------- ---- --------------\n");
    for (node = list->next; node != list; node = node->next)
    {
        m = (struct rt_mutex *)(rt_list_entry(node, struct rt_object, list));
        rt_kprintf("%-8.*s %-8.*s %04d %d\n",
                   RT_NAME_MAX,
                   m->parent.parent.name,
                   RT_NAME_MAX,
                   m->owner->name,
                   m->hold,
                   rt_list_len(&m->parent.suspend_thread));
    }

    return 0;
}

long list_mutex(void)
{
    return _list_mutex(&rt_object_container[RT_Object_Class_Mutex].object_list);
}
FINSH_FUNCTION_EXPORT(list_mutex, list mutex in system)
#endif

#ifdef RT_USING_MAILBOX
static long _list_mailbox(struct rt_list_node *list)
{
    struct rt_mailbox *m;
    struct rt_list_node *node;

    rt_kprintf("mailbox  entry size suspend thread\n");
    rt_kprintf("-------- ----  ---- --------------\n");
    for (node = list->next; node != list; node = node->next)
    {
        m = (struct rt_mailbox *)(rt_list_entry(node, struct rt_object, list));
        if (!rt_list_isempty(&m->parent.suspend_thread))
        {
            rt_kprintf("%-8.*s %04d  %04d %d:",
                       RT_NAME_MAX,
                       m->parent.parent.name,
                       m->entry,
                       m->size,
                       rt_list_len(&m->parent.suspend_thread));
            show_wait_queue(&(m->parent.suspend_thread));
            rt_kprintf("\n");
        }
        else
        {
            rt_kprintf("%-8.*s %04d  %04d %d\n",
                       RT_NAME_MAX,
                       m->parent.parent.name,
                       m->entry,
                       m->size,
                       rt_list_len(&m->parent.suspend_thread));
        }
    }

    return 0;
}

long list_mailbox(void)
{
    return _list_mailbox(&rt_object_container[RT_Object_Class_MailBox].object_list);
}
FINSH_FUNCTION_EXPORT(list_mailbox, list mail box in system)
#endif

#ifdef RT_USING_MESSAGEQUEUE
static long _list_msgqueue(struct rt_list_node *list)
{
    struct rt_messagequeue *m;
    struct rt_list_node *node;

    rt_kprintf("msgqueue entry suspend thread\n");
    rt_kprintf("-------- ----  --------------\n");
    for (node = list->next; node != list; node = node->next)
    {
        m = (struct rt_messagequeue *)(rt_list_entry(node, struct rt_object, list));
        if (!rt_list_isempty(&m->parent.suspend_thread))
        {
            rt_kprintf("%-8.*s %04d  %d:",
                       RT_NAME_MAX,
                       m->parent.parent.name,
                       m->entry,
                       rt_list_len(&m->parent.suspend_thread));
            show_wait_queue(&(m->parent.suspend_thread));
            rt_kprintf("\n");
        }
        else
        {
            rt_kprintf("%-8.*s %04d  %d\n",
                       RT_NAME_MAX,
                       m->parent.parent.name,
                       m->entry,
                       rt_list_len(&m->parent.suspend_thread));
        }
    }

    return 0;
}

long list_msgqueue(void)
{
    return _list_msgqueue(&rt_object_container[RT_Object_Class_MessageQueue].object_list);
}
FINSH_FUNCTION_EXPORT(list_msgqueue, list message queue in system)
#endif

#ifdef RT_USING_MEMHEAP
static long _list_memheap(struct rt_list_node *list)
{
    struct rt_memheap *mh;
    struct rt_list_node *node;

    rt_kprintf("memheap  pool size  max used size available size\n");
    rt_kprintf("-------- ---------- ------------- --------------\n");
    for (node = list->next; node != list; node = node->next)
    {
        mh = (struct rt_memheap *)rt_list_entry(node, struct rt_object, list);

        rt_kprintf("%-8.*s %-010d %-013d %-05d\n",
                   RT_NAME_MAX,
                   mh->parent.name,
                   mh->pool_size,
                   mh->max_used_size,
                   mh->available_size);
    }

    return 0;
}

long list_memheap(void)
{
    return _list_memheap(&rt_object_container[RT_Object_Class_MemHeap].object_list);
}
FINSH_FUNCTION_EXPORT(list_memheap, list memory heap in system)
#endif

#ifdef RT_USING_MEMPOOL
static long _list_mempool(struct rt_list_node *list)
{
    struct rt_mempool *mp;
    struct rt_list_node *node;

    rt_kprintf("mempool  block total free suspend thread\n");
    rt_kprintf("-------- ----  ----  ---- --------------\n");
    for (node = list->next; node != list; node = node->next)
    {
        mp = (struct rt_mempool *)rt_list_entry(node, struct rt_object, list);
        if (mp->suspend_thread_count > 0)
        {
            rt_kprintf("%-8.*s %04d  %04d  %04d %d:",
                       RT_NAME_MAX,
                       mp->parent.name,
                       mp->block_size,
                       mp->block_total_count,
                       mp->block_free_count,
                       mp->suspend_thread_count);
            show_wait_queue(&(mp->suspend_thread));
            rt_kprintf("\n");
        }
        else
        {
            rt_kprintf("%-8.*s %04d  %04d  %04d %d\n",
                       RT_NAME_MAX,
                       mp->parent.name,
                       mp->block_size,
                       mp->block_total_count,
                       mp->block_free_count,
                       mp->suspend_thread_count);
        }
    }

    return 0;
}

long list_mempool(void)
{
    return _list_mempool(&rt_object_container[RT_Object_Class_MemPool].object_list);
}
FINSH_FUNCTION_EXPORT(list_mempool, list memory pool in system)
#endif

static long _list_timer(struct rt_list_node *list)
{
    struct rt_timer *timer;
    struct rt_list_node *node;

    rt_kprintf("timer    periodic   timeout    flag\n");
    rt_kprintf("-------- ---------- ---------- -----------\n");
    for (node = list->next; node != list; node = node->next)
    {
        timer = (struct rt_timer *)(rt_list_entry(node, struct rt_object, list));
        rt_kprintf("%-8.*s 0x%08x 0x%08x ",
                   RT_NAME_MAX,
                   timer->parent.name,
                   timer->init_tick,
                   timer->timeout_tick);
        if (timer->parent.flag & RT_TIMER_FLAG_ACTIVATED)
            rt_kprintf("activated\n");
        else
            rt_kprintf("deactivated\n");
    }

    rt_kprintf("current tick:0x%08x\n", rt_tick_get());

    return 0;
}

long list_timer(void)
{
    return _list_timer(&rt_object_container[RT_Object_Class_Timer].object_list);
}
FINSH_FUNCTION_EXPORT(list_timer, list timer in system)

#ifdef RT_USING_DEVICE
static long _list_device(struct rt_list_node *list)
{
    struct rt_device *device;
    struct rt_list_node *node;
    char * const device_type_str[] =
    {
        "Character Device",
        "Block Device",
        "Network Interface",
        "MTD Device",
        "CAN Device",
        "RTC",
        "Sound Device",
        "Graphic Device",
        "I2C Bus",
        "USB Slave Device",
        "USB Host Bus",
        "SPI Bus",
        "SPI Device",
        "SDIO Bus",
        "PM Pseudo Device",
        "Unknown"
    };

    rt_kprintf("device    type      \n");
    rt_kprintf("-------- ---------- \n");
    for (node = list->next; node != list; node = node->next)
    {
        device = (struct rt_device *)(rt_list_entry(node, struct rt_object, list));
        rt_kprintf("%-8.*s %-8s \n",
                   RT_NAME_MAX,
                   device->parent.name,
                   (device->type <= RT_Device_Class_Unknown) ?
                   device_type_str[device->type] :
                   device_type_str[RT_Device_Class_Unknown]);
    }

    return 0;
}

long list_device(void)
{
    return _list_device(&rt_object_container[RT_Object_Class_Device].object_list);
}
FINSH_FUNCTION_EXPORT(list_device, list device in system)
#endif

#ifdef RT_USING_MODULE
#include <rtm.h>

int list_module(void)
{
    struct rt_module *module;
    struct rt_list_node *list, *node;

    list = &rt_object_container[RT_Object_Class_Module].object_list;

    rt_kprintf("module name     ref\n");
    rt_kprintf("------------ --------\n");
    for (node = list->next; node != list; node = node->next)
    {
        module = (struct rt_module *)(rt_list_entry(node, struct rt_object, list));
        rt_kprintf("%-16.*s %-04d\n",
                   RT_NAME_MAX, module->parent.name, module->nref);
    }

    return 0;
}

FINSH_FUNCTION_EXPORT(list_module, list module in system)

int list_mod_detail(const char *name)
{
    int i;
    struct rt_module *module;
    
    /* find module */
    if ((module = rt_module_find(name)) != RT_NULL)
    {
        /* module has entry point */
        if (!(module->parent.flag & RT_MODULE_FLAG_WITHOUTENTRY))
        {   
            struct rt_thread *thread;
            struct rt_list_node *tlist;
            rt_uint8_t *ptr;

            /* list main thread in module */
            if (module->module_thread != RT_NULL)
            {   
                rt_kprintf("main thread  pri  status      sp     stack size max used   left tick  error\n");
                rt_kprintf("------------- ---- ------- ---------- ---------- ---------- ---------- ---\n");
                thread = module->module_thread;
                rt_kprintf("%-8.*s 0x%02x", RT_NAME_MAX, thread->name, thread->current_priority);

                if (thread->stat == RT_THREAD_READY)        rt_kprintf(" ready  ");
                else if (thread->stat == RT_THREAD_SUSPEND) rt_kprintf(" suspend");
                else if (thread->stat == RT_THREAD_INIT)    rt_kprintf(" init   ");

                ptr = (rt_uint8_t*)thread->stack_addr;
                while (*ptr == '#')ptr ++;

                rt_kprintf(" 0x%08x 0x%08x 0x%08x 0x%08x %03d\n",
                    thread->stack_size + ((rt_uint32_t)thread->stack_addr - (rt_uint32_t)thread->sp),
                    thread->stack_size,
                    thread->stack_size - ((rt_uint32_t) ptr - (rt_uint32_t)thread->stack_addr),
                    thread->remaining_tick,
                    thread->error);
            }   

            /* list sub thread in module */
            tlist = &module->module_object[RT_Object_Class_Thread].object_list;
            if (!rt_list_isempty(tlist)) _list_thread(tlist);
#ifdef RT_USING_SEMAPHORE
            /* list semaphored in module */
            tlist = &module->module_object[RT_Object_Class_Semaphore].object_list;
            if (!rt_list_isempty(tlist)) _list_sem(tlist);
#endif
#ifdef RT_USING_MUTEX
            /* list mutex in module */
            tlist = &module->module_object[RT_Object_Class_Mutex].object_list;
            if (!rt_list_isempty(tlist)) _list_mutex(tlist);
#endif
#ifdef RT_USING_EVENT
            /* list event in module */
            tlist = &module->module_object[RT_Object_Class_Event].object_list;
            if (!rt_list_isempty(tlist)) _list_event(tlist);
#endif
#ifdef RT_USING_MAILBOX
            /* list mailbox in module */
            tlist = &module->module_object[RT_Object_Class_MailBox].object_list;
            if (!rt_list_isempty(tlist)) _list_mailbox(tlist);
#endif
#ifdef RT_USING_MESSAGEQUEUE
            /* list message queue in module */
            tlist = &module->module_object[RT_Object_Class_MessageQueue].object_list;
            if (!rt_list_isempty(tlist)) _list_msgqueue(tlist);
#endif
#ifdef RT_USING_MEMHEAP
            /* list memory heap in module */
            tlist = &module->module_object[RT_Object_Class_MemHeap].object_list;
            if (!rt_list_isempty(tlist)) _list_memheap(tlist);
#endif
#ifdef RT_USING_MEMPOOL
            /* list memory pool in module */
            tlist = &module->module_object[RT_Object_Class_MemPool].object_list;
            if (!rt_list_isempty(tlist)) _list_mempool(tlist);
#endif
#ifdef RT_USING_DEVICE
            /* list device in module */
            tlist = &module->module_object[RT_Object_Class_Device].object_list;
            if (!rt_list_isempty(tlist)) _list_device(tlist);
#endif
            /* list timer in module */
            tlist = &module->module_object[RT_Object_Class_Timer].object_list;
            if (!rt_list_isempty(tlist)) _list_timer(tlist);
        }

        rt_kprintf("symbol    address   \n");
        rt_kprintf("-------- ----------\n");
    
        /* list module export symbols */
        for (i=0; i<module->nsym; i++)
        {
            rt_kprintf("%s 0x%x\n",
                       module->symtab[i].name, module->symtab[i].addr);
        }
    }

    return 0;
}
FINSH_FUNCTION_EXPORT(list_mod_detail, list module objects in system)
#endif

long list(void)
{
    struct finsh_syscall_item *syscall_item;
    struct finsh_sysvar_item *sysvar_item;

    rt_kprintf("--Function List:\n");
    {
        struct finsh_syscall *index;
        for (index = _syscall_table_begin;
             index < _syscall_table_end;
             FINSH_NEXT_SYSCALL(index))
        {
			/* skip the internal command */
			if (strncpy((char*)index->name, "__", 2) == 0) continue;

#ifdef FINSH_USING_DESCRIPTION
            rt_kprintf("%-16s -- %s\n", index->name, index->desc);
#else
            rt_kprintf("%s\n", index->name);
#endif
        }
    }

    /* list syscall list */
    syscall_item = global_syscall_list;
    while (syscall_item != NULL)
    {
        rt_kprintf("[l] %s\n", syscall_item->syscall.name);
        syscall_item = syscall_item->next;
    }

    rt_kprintf("--Variable List:\n");
    {
        struct finsh_sysvar *index;
        for (index = _sysvar_table_begin;
             index < _sysvar_table_end;
             FINSH_NEXT_SYSVAR(index))
        {
#ifdef FINSH_USING_DESCRIPTION
            rt_kprintf("%-16s -- %s\n", index->name, index->desc);
#else
            rt_kprintf("%s\n", index->name);
#endif
        }
    }

    sysvar_item = global_sysvar_list;
    while (sysvar_item != NULL)
    {
        rt_kprintf("[l] %s\n", sysvar_item->sysvar.name);
        sysvar_item = sysvar_item->next;
    }

    return 0;
}
FINSH_FUNCTION_EXPORT(list, list all symbol in system)

static int str_is_prefix(const char *prefix, const char *str)
{
    while ((*prefix) && (*prefix == *str))
    {
        prefix ++;
        str ++;
    }

    if (*prefix == 0)
        return 0;

    return -1;
}

static int str_common(const char *str1, const char *str2)
{
    const char *str = str1;

    while ((*str != 0) && (*str2 != 0) && (*str == *str2))
    {
        str ++;
        str2 ++;
    }

    return (str - str1);
}

void list_prefix(char *prefix)
{
    struct finsh_syscall_item *syscall_item;
    struct finsh_sysvar_item *sysvar_item;
    rt_uint16_t func_cnt, var_cnt;
    int length, min_length;
    const char *name_ptr;

    func_cnt = 0;
    var_cnt  = 0;
    min_length = 0;
    name_ptr = RT_NULL;

    /* checks in system function call */
    {
        struct finsh_syscall *index;
        for (index = _syscall_table_begin;
             index < _syscall_table_end;
             FINSH_NEXT_SYSCALL(index))
        {
			/* skip internal command */
			if (str_is_prefix("__", index->name) == 0) continue;
			
            if (str_is_prefix(prefix, index->name) == 0)
            {
                if (func_cnt == 0)
                {
                    rt_kprintf("--function:\n");

                    if (*prefix != 0)
                    {
                        /* set name_ptr */
                        name_ptr = index->name;

                        /* set initial length */
                        min_length = strlen(name_ptr);
                    }
                }

                func_cnt ++;

                if (*prefix != 0)
                {
                    length = str_common(name_ptr, index->name);
                    if (length < min_length)
                        min_length = length;
                }

#ifdef FINSH_USING_DESCRIPTION
                rt_kprintf("%-16s -- %s\n", index->name, index->desc);
#else
                rt_kprintf("%s\n", index->name);
#endif
            }
        }
    }

    /* checks in dynamic system function call */
    syscall_item = global_syscall_list;
    while (syscall_item != NULL)
    {
        if (str_is_prefix(prefix, syscall_item->syscall.name) == 0)
        {
            if (func_cnt == 0)
            {
                rt_kprintf("--function:\n");
                if (*prefix != 0 && name_ptr == NULL)
                {
                    /* set name_ptr */
                    name_ptr = syscall_item->syscall.name;

                    /* set initial length */
                    min_length = strlen(name_ptr);
                }
            }

            func_cnt ++;

            if (*prefix != 0)
            {
                length = str_common(name_ptr, syscall_item->syscall.name);
                if (length < min_length)
                    min_length = length;
            }

            rt_kprintf("[l] %s\n", syscall_item->syscall.name);
        }
        syscall_item = syscall_item->next;
    }

    /* checks in system variable */
    {
        struct finsh_sysvar* index;
        for (index = _sysvar_table_begin;
             index < _sysvar_table_end;
             FINSH_NEXT_SYSVAR(index))
        {
            if (str_is_prefix(prefix, index->name) == 0)
            {
                if (var_cnt == 0)
                {
                    rt_kprintf("--variable:\n");

                    if (*prefix != 0 && name_ptr == NULL)
                    {
                        /* set name_ptr */
                        name_ptr = index->name;

                        /* set initial length */
                        min_length = strlen(name_ptr);

                    }
                }

                var_cnt ++;

                if (*prefix != 0)
                {
                    length = str_common(name_ptr, index->name);
                    if (length < min_length)
                        min_length = length;
                }

#ifdef FINSH_USING_DESCRIPTION
                rt_kprintf("%-16s -- %s\n", index->name, index->desc);
#else
                rt_kprintf("%s\n", index->name);
#endif
            }
        }
    }

    /* checks in dynamic system variable */
    sysvar_item = global_sysvar_list;
    while (sysvar_item != NULL)
    {
        if (str_is_prefix(prefix, sysvar_item->sysvar.name) == 0)
        {
            if (var_cnt == 0)
            {
                rt_kprintf("--variable:\n");
                if (*prefix != 0 && name_ptr == NULL)
                {
                    /* set name_ptr */
                    name_ptr = sysvar_item->sysvar.name;

                    /* set initial length */
                    min_length = strlen(name_ptr);
                }
            }

            var_cnt ++;

            if (*prefix != 0)
            {
                length = str_common(name_ptr, sysvar_item->sysvar.name);
                if (length < min_length)
                    min_length = length;
            }

            rt_kprintf("[v] %s\n", sysvar_item->sysvar.name);
        }
        sysvar_item = sysvar_item->next;
    }

    /* only one matched */
    if (name_ptr != NULL)
    {
        rt_strncpy(prefix, name_ptr, min_length);
    }
}

#ifdef FINSH_USING_SYMTAB
static int dummy = 0;
FINSH_VAR_EXPORT(dummy, finsh_type_int, dummy variable for finsh)
#endif