LinuxC模拟ls程序

#include <sys/types.h>
#include <dirent.h>

int main(int argc, char* argv[])
{
    DIR* lpoDir;
    struct dirent* lpoDirent;

    if ( 2 != argc)
    {   
        printf("a single argument (the directory name) is required");
        return -1; 
    }   

    if ( (lpoDir = opendir(argv[1])) == NULL)
    {   
        printf("can't open %s", argv[1]);
        return -1; 
    }   

    while ( (lpoDirent = readdir(lpoDir)) != NULL)
        printf("%s\n", lpoDirent->d_name);

    closedir(lpoDir);
    return 0;
}