static struct usb_function_instance *try_get_usb_function_instance(const char *name)
{
    struct usb_function_driver *fd;
    struct usb_function_instance *fi;

    fi = ERR_PTR(-ENOENT);
    mutex_lock(&func_lock);
    list_for_each_entry(fd, &func_list, list) {

        if (strcmp(name, fd->name))
            
 
continue;

        if (!try_module_get(fd->mod)) {
            fi = ERR_PTR(-EBUSY);
            break;
        }
        fi = fd->alloc_inst();
        if (IS_ERR(fi))
            module_put(fd->mod);
        else
            fi->fd = fd;
        break;
    }
    mutex_unlock(&func_lock);
    
 
return fi;
}

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <pthread.h>
#include <semaphore.h>
#include <unistd.h>
#include <signal.h>
#include <string.h>


// static
static char*  name[] = {"uac","uvc","back","fprint"};

int main()
{
    int i = 0;

    while(i++<10)
    {

        if(strcmp(name[i],"uac"))
        {
            printf("string is not the same \n");
            continue;
        }

    }
    
    while(1);

    return 0;
}
 

C/C++函式，比較兩個字串

設這兩個字串為str1，str2，

若str1==str2，則返回零;

若str1<str2，則返回負數;

若str1>str2，則返回正數。

matlab中函式，strcmp(s1，s2) 判斷兩個字串s1和s2是否相同，相同返回true ,不同返回false