#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <grp.h>
#include <pwd.h>
void do_ls(char []);
void dostat(char*);
void show_file_info(char*,struct stat *);
void mode_to_letters(int, char[]);
char *uid_to_name(uid_t);
char *gid_to_name(gid_t);
void main(int ac, char *av[])
{
if(ac == 1)
do_ls(".");
else
{
while(--ac)
{
printf("%s:\n",*++av);
do_ls(*av);
}
}
}
void do_ls(char dirname[])
{
DIR *dir_ptr;
struct dirent *direntp;
if((dir_ptr = opendir(dirname)) == NULL)
fprintf(stderr, "ls3: cannot open %s\n", dirname);
else
{
while ((direntp = readdir(dir_ptr)) != NULL)
dostat(direntp->d_name);
closedir(dir_ptr);
}
}
void dostat(char *filename)
{
struct stat info;
if (stat(filename, &info) == -1)
perror(filename);
else
show_file_info(filename, &info);
}
void show_file_info(char *filename, struct stat *info_p)
{
char *uid_to_name(), *ctime(), *gid_to_name(), *filemode();
void mode_to_letters();
char modestr[11];
mode_to_letters(info_p->st_mode, modestr);
printf("%s",modestr);
printf("%4d ",(int)info_p->st_nlink);
printf("%-8s ",uid_to_name(info_p->st_uid));
printf("%-8s ",gid_to_name(info_p->st_gid));
printf("%8ld ",(long)info_p->st_size);
printf("%.12s ",4+ctime(&info_p->st_mtime));
printf("%s\n",filename);
}
void mode_to_letters(int mode, char str[])
{
strcpy(str, "----------");
if(S_ISDIR(mode)) str[0] = 'd';
if(S_ISCHR(mode)) str[0] = 'c';
if(S_ISBLK(mode)) str[0] = 'b';
if(mode&S_IRUSR) str[1] = 'r';
if(mode&S_IWUSR) str[2] = 'w';
if(mode&S_IXUSR) str[3] = 'x';
if(mode&S_IRGRP) str[1] = 'r';
if(mode&S_IWGRP) str[2] = 'w';
if(mode&S_IXGRP) str[3] = 'x';
if(mode&S_IROTH) str[1] = 'r';
if(mode&S_IWOTH) str[2] = 'w';
if(mode&S_IXOTH) str[3] = 'x';
}
char *uid_to_name(uid_t uid)
{
struct passwd *getpwuid(), *pw_ptr;
static char numstr[10];
if((pw_ptr = getpwuid(uid)) == NULL)
{
sprintf(numstr,"%d", uid);
return numstr;
}
else
return pw_ptr->pw_name;
}
char *gid_to_name(gid_t gid)
{
struct group *getgrgid(), *grp_ptr;
static char numstr[10];
if((grp_ptr = getgrgid(gid)) == NULL)
{
sprintf(numstr,"%d", gid);
return numstr;
}
else
return grp_ptr->gr_name;
}