linux_ls.c

此程序在linux下实现了类似ls的功能

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

int wenjian(char *argv, FILE *fp)
{
    int a;
    DIR *dir;
    struct dirent *ptr;
    struct stat buf;
    dir=opendir(argv);
    if(dir == NULL)
    {
	printf("Open %s error,please input true parameter !\n",argv);
	return(0);
    }
    else
    {
    	while((ptr = readdir(dir)) != NULL)
    	{   
	    //ptr->d_name is "." or "..",if(0 && 0);
	    if(strcmp(ptr->d_name, ".") && strcmp(ptr->d_name, ".."))
	    {
	    	char path[256];
	    	strcpy(path, argv);
	    	strcat(path, "/");
	    	strcat(path, ptr->d_name);
	    	printf("%s\n", path);
	    	fwrite(path, strlen(path), 1, fp);
            	fwrite("\n", 1, 1, fp);
	    	lstat(path, &buf);
	    	if(S_ISDIR(buf.st_mode))
		    wenjian(path, fp);
	    }
	    else
	    {
	    	char path[256];
	    	strcpy(path, argv);
	    	strcat(path, "/");
	    	strcat(path, ptr->d_name);
	    	printf("%s\n", path);
	    	fwrite(path, strlen(path), 1, fp);
	    	fwrite("\n", 1, 1, fp);
	    }
	}
    	a = closedir(dir); 
    	if(a != 0)
    	{
	    printf("Close \"%s\" error !\n",argv);
	    return(0);
   	}
    	printf("Close \"%s\" succeed !\n",argv);
    	return(0);
    }
}

int close_file(FILE *fp)
{
    int a;
    a = fclose(fp);
    if(a != 0)
    {
	printf("Close \"/home/hongzhi/code/list\" error !\n");
	return(0);
    }
    printf("Close \"/home/hongzhi/code/list\" succeed !\n");
    return(0);
}

FILE* open_file(void)
{
    FILE *fpd;
    fpd=fopen("/home/hongzhi/code/list", "w+");
    if(fpd == NULL)
    {
	printf("Open /home/hongzhi/code/list error !\n");
	return(0);
    }
    printf("Open \"/home/hongzhi/code/list\" succeed !\n" );
    return fpd;
}

int main(int argc,char **argv)
{
    FILE *fp;
    if(argc!=2)
    {
	printf("Please input two parameters !\n");
	return(0);
    }
    if(argv[1][strlen(argv[1])-1] == '/')
    {
	printf("Please no take '/' behind second parameter' foot !\n");
    	return(0);
    }
    fp = open_file();
    wenjian(argv[1], fp);
    close_file(fp);
    return(0);
    //exit(0);
}