今日任务

代码

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <dirent.h>
#include <grp.h>
#include <time.h>


/*
 * function:   打印某个文件的基本属性：
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int print_file_info(char *filename){
	//定义结构体变量接受文件的属性
	struct stat buf;
	//printf("---%s---\n",filename);
	if(-1==stat(filename,&buf)){
		perror("stat");
		printf("%d",__LINE__);
		return -1;
	}
	//打印文件类型
	switch (buf.st_mode & S_IFMT) {
	case S_IFBLK:  printf("b");            break;
	case S_IFCHR:  printf("c");        break;
	case S_IFDIR:  printf("d");               break;
	case S_IFIFO:  printf("p");               break;
	case S_IFLNK:  printf("l");                 break;
	case S_IFREG:  printf("-");            break;
	case S_IFSOCK: printf("s");                  break;
	default:       printf("?");                break;
	}
	//打印文件权限
	for (int i=0; i<9; i++)
	{
		if(0==(buf.st_mode & 0400>>i)){
			putchar('-');
		}else{
			if(i%3==0)
				putchar('r');
			else if(i%3==1)
				putchar('w');
			else if(i%3==2)
				putchar('x');
			else
				putchar('?');
		}
	}
	//打印文件硬链接个数
	printf(" %ld ",buf.st_nlink);
	//打印用户名
	struct passwd* pwd=getpwuid(buf.st_uid);
	if(NULL==pwd){
		perror("getpwuid");printf("%d",__LINE__);
		return -1;
	}
	printf("%s ",pwd->pw_name);
	//打印用户所在组名
	struct group* grp=getgrgid(buf.st_gid);
	if(NULL==grp){
		perror("getgrgid");
		printf("%d",__LINE__);
		return -1;
	}
	printf("%s ",grp->gr_name);

	//打印文件大小
	printf("%5ld ",buf.st_size);

	//打印时间
	struct tm *time=localtime(&buf.st_atime);
	printf("%4d  %d %d:%d ",time->tm_mon+1,time->tm_mday,time->tm_hour,time->tm_min);

	//打印文件名
	printf(" %s\n ",filename);

	return 0;
}
/*
 * function:    打印某个目录下的所有文件名（）
 * @param [ in] 
 * @param [out] 
 * @return      
 */
int print_all_file(char *filepath){
	DIR * od=opendir(filepath);
	if(NULL==od){
		perror("opendir");
		printf("%d",__LINE__);
		return -1;
	}
	//读取文件，循环打印文件名
	struct dirent* rd=NULL;
	while(1){
		rd=readdir(od);
		if(NULL==rd)
			break;
		if('.'==rd->d_name[0])
			continue;
		char file[20]="";
		strcpy(file,filepath);
		//strcat(file,"/");
		strcat(file,rd->d_name);
		//printf("%s\n",file);
		print_file_info(file);
	}

	closedir(od);
	return 0;
}
int main(int argc, const char *argv[])
{
	puts("please input directory name you want to printf");
	char filepath[20]="";
	scanf("%s",filepath);
	print_all_file(filepath);
	//print_file_info("1.txt");
	return 0;
}

运行结果：

今日思维导图：