如何获取一个目录下的子文件和子目录

一. 使用opendir和readdir glibc函数

1.opendir

2.readdir 

 

 二.dir目录文件内容究竟长啥样

执行以下命令打开一个目录文件：

vim verilog/

 

三.提取一个目录下的子目录功能实现

/* num_subdirs - find the number of sub-directories in the specified path
 *	@dirpath - directory path to find sub-directories underneath
 *	@prefix - only count sub-directory names starting with prefix.
 *		Use blank string, "", to count all.
 *	Return - number of sub-directories
 *  参数一：目录文件路径
 *  参数二：要查找的子目录名(支持部分匹配)
 */
static int num_subdirs(char *dirpath, char *prefix)
{
	int count = 0;
	DIR *dirp;
	struct dirent *dir;
	int prefix_len = strlen(prefix);
 
	dirp = opendir(dirpath);
	if (dirp) {
		while ((dir = readdir(dirp)) != 0) {
			if ((strcmp(dir->d_name, ".") == 0) ||
				(strcmp(dir->d_name, "..") == 0))
				continue;
			if (prefix_len &&
				strncmp(dir->d_name, prefix, prefix_len))
				continue;
			count++;
		}
		closedir(dirp);
	}
 
	return count;
}