读取一个目录中的所有文件

#include <stdio.h>
#include <stdlib.h>
#include <sys/unistd.h>
#include <sys/types.h>
#include <dirent.h>

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

        dir = opendir(argv[1]);
        if (!dir) {
                fprintf(stderr, "%s is opened error!\n", argv[1]);
                exit(1);
        }

        while ((dp = readdir(dir)) != NULL) {
                const char * p = dp ->d_name;
                fprintf(stdout, "%s\n", p);
        }

        return 0;
}