288 lines
6.8 KiB
C
288 lines
6.8 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <dirent.h>
|
|
#include <errno.h>
|
|
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <time.h>
|
|
|
|
#include <pwd.h>
|
|
#include <grp.h>
|
|
|
|
#include <linux/kdev_t.h>
|
|
|
|
// bits for flags argument
|
|
#define LIST_LONG (1 << 0)
|
|
#define LIST_ALL (1 << 1)
|
|
#define LIST_RECURSIVE (1 << 2)
|
|
#define LIST_DIRECTORIES (1 << 3)
|
|
|
|
// fwd
|
|
static int listpath(const char *name, int flags);
|
|
|
|
static char mode2kind(unsigned mode)
|
|
{
|
|
switch(mode & S_IFMT){
|
|
case S_IFSOCK: return 's';
|
|
case S_IFLNK: return 'l';
|
|
case S_IFREG: return '-';
|
|
case S_IFDIR: return 'd';
|
|
case S_IFBLK: return 'b';
|
|
case S_IFCHR: return 'c';
|
|
case S_IFIFO: return 'p';
|
|
default: return '?';
|
|
}
|
|
}
|
|
|
|
static void mode2str(unsigned mode, char *out)
|
|
{
|
|
*out++ = mode2kind(mode);
|
|
|
|
*out++ = (mode & 0400) ? 'r' : '-';
|
|
*out++ = (mode & 0200) ? 'w' : '-';
|
|
if(mode & 04000) {
|
|
*out++ = (mode & 0100) ? 's' : 'S';
|
|
} else {
|
|
*out++ = (mode & 0100) ? 'x' : '-';
|
|
}
|
|
*out++ = (mode & 040) ? 'r' : '-';
|
|
*out++ = (mode & 020) ? 'w' : '-';
|
|
if(mode & 02000) {
|
|
*out++ = (mode & 010) ? 's' : 'S';
|
|
} else {
|
|
*out++ = (mode & 010) ? 'x' : '-';
|
|
}
|
|
*out++ = (mode & 04) ? 'r' : '-';
|
|
*out++ = (mode & 02) ? 'w' : '-';
|
|
if(mode & 01000) {
|
|
*out++ = (mode & 01) ? 't' : 'T';
|
|
} else {
|
|
*out++ = (mode & 01) ? 'x' : '-';
|
|
}
|
|
*out = 0;
|
|
}
|
|
|
|
static void user2str(unsigned uid, char *out)
|
|
{
|
|
struct passwd *pw = getpwuid(uid);
|
|
if(pw) {
|
|
strcpy(out, pw->pw_name);
|
|
} else {
|
|
sprintf(out, "%d", uid);
|
|
}
|
|
}
|
|
|
|
static void group2str(unsigned gid, char *out)
|
|
{
|
|
struct group *gr = getgrgid(gid);
|
|
if(gr) {
|
|
strcpy(out, gr->gr_name);
|
|
} else {
|
|
sprintf(out, "%d", gid);
|
|
}
|
|
}
|
|
|
|
static int listfile(const char *path, int flags)
|
|
{
|
|
struct stat s;
|
|
char date[32];
|
|
char mode[16];
|
|
char user[16];
|
|
char group[16];
|
|
const char *name;
|
|
|
|
/* name is anything after the final '/', or the whole path if none*/
|
|
name = strrchr(path, '/');
|
|
if(name == 0) {
|
|
name = path;
|
|
} else {
|
|
name++;
|
|
}
|
|
|
|
if(lstat(path, &s) < 0) {
|
|
return -1;
|
|
}
|
|
|
|
mode2str(s.st_mode, mode);
|
|
user2str(s.st_uid, user);
|
|
group2str(s.st_gid, group);
|
|
|
|
strftime(date, 32, "%Y-%m-%d %H:%M", localtime((const time_t*)&s.st_mtime));
|
|
date[31] = 0;
|
|
|
|
// 12345678901234567890123456789012345678901234567890123456789012345678901234567890
|
|
// MMMMMMMM UUUUUUUU GGGGGGGGG XXXXXXXX YYYY-MM-DD HH:MM NAME (->LINK)
|
|
|
|
switch(s.st_mode & S_IFMT) {
|
|
case S_IFBLK:
|
|
case S_IFCHR:
|
|
printf("%s %-8s %-8s %3d, %3d %s %s\n",
|
|
mode, user, group,
|
|
(int) MAJOR(s.st_rdev), (int) MINOR(s.st_rdev),
|
|
date, name);
|
|
break;
|
|
case S_IFREG:
|
|
printf("%s %-8s %-8s %8d %s %s\n",
|
|
mode, user, group, (int) s.st_size, date, name);
|
|
break;
|
|
case S_IFLNK: {
|
|
char linkto[256];
|
|
int len;
|
|
|
|
len = readlink(path, linkto, 256);
|
|
if(len < 0) return -1;
|
|
|
|
if(len > 255) {
|
|
linkto[252] = '.';
|
|
linkto[253] = '.';
|
|
linkto[254] = '.';
|
|
linkto[255] = 0;
|
|
} else {
|
|
linkto[len] = 0;
|
|
}
|
|
|
|
printf("%s %-8s %-8s %s %s -> %s\n",
|
|
mode, user, group, date, name, linkto);
|
|
break;
|
|
}
|
|
default:
|
|
printf("%s %-8s %-8s %s %s\n",
|
|
mode, user, group, date, name);
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int listdir(const char *name, int flags)
|
|
{
|
|
char tmp[4096];
|
|
DIR *d;
|
|
struct dirent *de;
|
|
|
|
d = opendir(name);
|
|
if(d == 0) {
|
|
fprintf(stderr, "opendir failed, %s\n", strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
while((de = readdir(d)) != 0){
|
|
if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) continue;
|
|
if(de->d_name[0] == '.' && (flags & LIST_ALL) == 0) continue;
|
|
if ((flags & LIST_LONG) != 0) {
|
|
sprintf(tmp, "%s/%s", name, de->d_name);
|
|
listfile(tmp, flags);
|
|
} else {
|
|
printf("%s\n", de->d_name);
|
|
}
|
|
}
|
|
|
|
if (flags & LIST_RECURSIVE) {
|
|
rewinddir(d);
|
|
|
|
while ((de = readdir(d)) != 0) {
|
|
struct stat s;
|
|
int err;
|
|
|
|
if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
|
|
continue;
|
|
if (de->d_name[0] == '.' && (flags & LIST_ALL) == 0)
|
|
continue;
|
|
|
|
if (!strcmp(name, "/")) sprintf(tmp, "/%s", de->d_name);
|
|
else sprintf(tmp, "%s/%s", name, de->d_name);
|
|
|
|
/*
|
|
* If the name ends in a '/', use stat() so we treat it like a
|
|
* directory even if it's a symlink.
|
|
*/
|
|
if (tmp[strlen(tmp)-1] == '/')
|
|
err = stat(tmp, &s);
|
|
else
|
|
err = lstat(tmp, &s);
|
|
|
|
if (err < 0) {
|
|
perror(tmp);
|
|
closedir(d);
|
|
return -1;
|
|
}
|
|
|
|
if (S_ISDIR(s.st_mode)) {
|
|
printf("\n%s:\n", tmp);
|
|
listdir(tmp, flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
closedir(d);
|
|
return 0;
|
|
}
|
|
|
|
static int listpath(const char *name, int flags)
|
|
{
|
|
struct stat s;
|
|
int err;
|
|
|
|
/*
|
|
* If the name ends in a '/', use stat() so we treat it like a
|
|
* directory even if it's a symlink.
|
|
*/
|
|
if (name[strlen(name)-1] == '/')
|
|
err = stat(name, &s);
|
|
else
|
|
err = lstat(name, &s);
|
|
|
|
if (err < 0) {
|
|
perror(name);
|
|
return -1;
|
|
}
|
|
|
|
if ((flags & LIST_DIRECTORIES) == 0 && S_ISDIR(s.st_mode)) {
|
|
if (flags & LIST_RECURSIVE)
|
|
printf("\n%s:\n", name);
|
|
return listdir(name, flags);
|
|
} else {
|
|
if ((flags & LIST_LONG) != 0) {
|
|
/* yeah this calls stat() again*/
|
|
return listfile(name, flags);
|
|
} else {
|
|
printf("%s\n", name);
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
int ls_main(int argc, char **argv)
|
|
{
|
|
int flags = 0;
|
|
int listed = 0;
|
|
|
|
if(argc > 1) {
|
|
int i;
|
|
int err = 0;
|
|
|
|
for (i = 1; i < argc; i++) {
|
|
if(!strcmp(argv[i], "-l")) {
|
|
flags |= LIST_LONG;
|
|
} else if (!strcmp(argv[i], "-a")) {
|
|
flags |= LIST_ALL;
|
|
} else if (!strcmp(argv[i], "-R")) {
|
|
flags |= LIST_RECURSIVE;
|
|
} else if (!strcmp(argv[i], "-d")) {
|
|
flags |= LIST_DIRECTORIES;
|
|
} else {
|
|
listed++;
|
|
if(listpath(argv[i], flags) != 0) {
|
|
err = EXIT_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (listed > 0) return err;
|
|
}
|
|
|
|
// list working directory if no files or directories were specified
|
|
return listpath(".", flags);
|
|
}
|