myls.c

LINUX下FTP服务器需要的list。个人觉得还不错

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

int main(int argc, char **argv)
{
	struct stat sbuf;
	mode_t mode;
	char buf[1024];
	DIR *dp;
	struct dirent *link;
	dp=opendir(".");
	if (dp==NULL)
	{
		return -1;
	}

	while ((link=readdir(dp))!=0)
	{
		if (lstat(link->d_name, &sbuf)==-1)
		{
			continue;
		}

		if (strcmp(link->d_name, ".") == 0 || strcmp(link->d_name, "..") == 0)
		{
			continue;
		}

		mode=sbuf.st_mode;
		char perms[] = "----------";
		perms[0]='?';
		switch (mode & S_IFMT)
		{
		case S_IFREG:
			perms[0] = '-';
			break;
		case S_IFDIR:
			perms[0] = 'd';
			break;
		case S_IFLNK:
			perms[0] = 'l';
			break;
		case S_IFIFO:
			perms[0] = 'p';
			break;
		case S_IFSOCK:
			perms[0] = 's';
			break;
		case S_IFCHR:
			perms[0] = 'c';
			break;
		case S_IFBLK:
			perms[0] = 'b';
			break;
		}
		if (S_IRUSR  &  mode)
			perms[1] = 'r';
		if (S_IWUSR  & mode)
			perms[2] = 'w';
		if (mode & S_IXUSR)
			perms[3] = 'x';
		if (mode & S_IRGRP)
			perms[4] = 'r';
		if (mode & S_IWGRP)
			perms[5] = 'w';
		if (mode & S_IXGRP)
			perms[6] = 'x';
		if (mode & S_IROTH)
			perms[7] = 'r';
		if (mode & S_IWOTH)
			perms[8] = 'w';
		if (mode & S_IXOTH)
			perms[9] = 'x';
		perms[10] = '\0';

		int off=0;
		memset(buf,0,sizeof(buf));
		off += sprintf(buf+off, "%s ",perms);
		off += sprintf (buf + off, " %3d %-8d %-8d ",sbuf.st_nlink, sbuf.st_uid, sbuf.st_gid);
		off+=sprintf(buf + off, "%8lu ", (unsigned long)sbuf.st_size);


		char* p_date_format = "%b %e %H:%M";
		char datebuf[13]={0};
		struct tm* p_tm;
		//struct timeval tv;
		//long local_time;
		//gettimeofday(&tv,NULL);
		//local_time = tv.tv_sec;
		
		p_tm = localtime(&sbuf.st_mtime);

	/*if (sbuf.st_mtime > local_time ||
			(local_time - sbuf.st_mtime) > 60*60*24*182)
		{
			p_date_format = "%b %e  %Y";
		}
		*/
		
		strftime(datebuf, sizeof(datebuf), p_date_format, p_tm);

		off += sprintf (buf + off, "%s ", datebuf);

		if (S_ISLNK(sbuf.st_mode))
		{
			char tmp[1024]={0};
			readlink(link->d_name,tmp,sizeof(tmp));
			off += sprintf (buf + off, "%s -> %s", link->d_name,tmp);
		}
		else
		{
			off += sprintf (buf + off, "%s", link->d_name);
		}
		off += sprintf (buf + off, "%s", "\r\n");
		printf("%s",buf);
	}
	closedir(dp);
	return 0;
}