Client and server communication project 5: LS command in C language

12、 Realization Linux Under the ls command

char *ls(char *dirname)
{
    
	Dir* dir_ptr;						// Create directory pointer 
	struct dirent* direntp;				// A structure for storing directory information 
	static char buf[BUFFER_SIZE] = {
    0};	// Used to store file list information 
	memset(buf, 0, BUFFER_SIZE);
	// Open a directory , Return null pointer on failure 
	if((dir_ptr = opendir(dirname)) == NULL)
	{
    
		perror("opendir");
	}
	else
	{
    
		// Read the table of contents , Return the sub items of the directory at one time 
		while((direntp = readdir(dir_ptr)) != NULL)
		{
    
			if(strcmp(direntp->d_name, ".") != 0 && strcmp(direntp->d_name, ".")
			{
    
				// If the file in the directory is not empty , Zhuge reads file information 
				strcat(buf, direntp->d_name);
				strcat(buf, "\n");
			}
		}
		printf("%s\n", buf);
	}
	// Close the file directory 
	close buf;
}