sbase/ls.c

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C
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/* See LICENSE file for copyright and license details. */
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#include <sys/stat.h>
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#include <dirent.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
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#include "util.h"
typedef struct {
char *name;
mode_t mode, tmode;
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nlink_t nlink;
uid_t uid;
gid_t gid;
off_t size;
time_t t;
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ino_t ino;
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} Entry;
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static int entcmp(const void *, const void *);
static void ls(Entry *);
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static void lsdir(const char *);
static void mkent(Entry *, char *, int, int);
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static void output(Entry *);
static int aflag = 0;
static int cflag = 0;
static int dflag = 0;
static int Fflag = 0;
static int Hflag = 0;
static int hflag = 0;
static int iflag = 0;
static int Lflag = 0;
static int lflag = 0;
static int rflag = 0;
static int tflag = 0;
static int Uflag = 0;
static int first = 1;
static int many;
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static void
usage(void)
{
eprintf("usage: %s [-1acdFHhiLlrtU] [file ...]\n", argv0);
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}
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int
main(int argc, char *argv[])
{
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int i;
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Entry *ents;
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ARGBEGIN {
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case '1':
/* ignore */
break;
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case 'a':
aflag = 1;
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break;
case 'c':
cflag = 1;
break;
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case 'd':
dflag = 1;
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break;
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case 'F':
Fflag = 1;
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break;
case 'H':
Hflag = 1;
break;
case 'h':
hflag = 1;
break;
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case 'i':
iflag = 1;
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break;
case 'L':
Lflag = 1;
break;
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case 'l':
lflag = 1;
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break;
case 'r':
rflag = 1;
break;
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case 't':
tflag = 1;
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break;
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case 'U':
Uflag = 1;
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break;
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default:
usage();
} ARGEND;
many = (argc > 1);
if (argc == 0)
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*--argv = ".", argc++;
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ents = emalloc(argc * sizeof(*ents));
for (i = 0; i < argc; i++)
mkent(&ents[i], argv[i], 1, Hflag || Lflag);
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qsort(ents, argc, sizeof *ents, entcmp);
for (i = 0; i < argc; i++)
ls(&ents[rflag ? argc-i-1 : i]);
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return 0;
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}
static int
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entcmp(const void *va, const void *vb)
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{
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const Entry *a = va, *b = vb;
if (tflag)
return b->t - a->t;
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else
return strcmp(a->name, b->name);
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}
static void
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ls(Entry *ent)
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{
if ((S_ISDIR(ent->mode) || (S_ISLNK(ent->mode) && S_ISDIR(ent->tmode) && !Fflag && !lflag)) && !dflag) {
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lsdir(ent->name);
} else {
output(ent);
}
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}
static void
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lsdir(const char *path)
{
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char *cwd, *p;
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long i, n = 0;
struct dirent *d;
DIR *dp;
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Entry ent, *ents = NULL;
size_t sz;
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cwd = agetcwd();
if (!(dp = opendir(path)))
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eprintf("opendir %s:", path);
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if (chdir(path) < 0)
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eprintf("chdir %s:", path);
if (many) {
if (!first)
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putchar('\n');
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printf("%s:\n", path);
first = 0;
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}
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while ((d = readdir(dp))) {
if (d->d_name[0] == '.' && !aflag)
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continue;
if (Uflag){
mkent(&ent, d->d_name, Fflag || lflag || iflag, Lflag);
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output(&ent);
} else {
ents = erealloc(ents, ++n * sizeof *ents);
p = emalloc((sz = strlen(d->d_name)+1));
memcpy(p, d->d_name, sz);
mkent(&ents[n-1], p, tflag || Fflag || lflag || iflag, Lflag);
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}
}
closedir(dp);
if (!Uflag){
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qsort(ents, n, sizeof *ents, entcmp);
for (i = 0; i < n; i++) {
output(&ents[rflag ? n-i-1 : i]);
free(ents[rflag ? n-i-1 : i].name);
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}
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}
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if (chdir(cwd) < 0)
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eprintf("chdir %s:", cwd);
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free(ents);
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free(cwd);
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}
static void
mkent(Entry *ent, char *path, int dostat, int follow)
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{
struct stat st;
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ent->name = path;
if (!dostat)
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return;
if ((follow ? stat : lstat)(path, &st) < 0)
eprintf("%s %s:", follow ? "stat" : "lstat", path);
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ent->mode = st.st_mode;
ent->nlink = st.st_nlink;
ent->uid = st.st_uid;
ent->gid = st.st_gid;
ent->size = st.st_size;
ent->t = cflag ? st.st_ctime : st.st_mtime;
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ent->ino = st.st_ino;
if (S_ISLNK(ent->mode))
ent->tmode = stat(path, &st) == 0 ? st.st_mode : 0;
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}
static char *
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indicator(mode_t mode)
{
if (!Fflag)
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return "";
if (S_ISLNK(mode))
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return "@";
else if (S_ISDIR(mode))
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return "/";
else if (S_ISFIFO(mode))
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return "|";
else if (S_ISSOCK(mode))
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return "=";
else if (mode & S_IXUSR ||
mode & S_IXGRP ||
mode & S_IXOTH)
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return "*";
else
return "";
}
static void
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output(Entry *ent)
{
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char buf[BUFSIZ], *fmt;
char mode[] = "----------";
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ssize_t len;
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struct group *gr;
struct passwd *pw;
char pwname[_SC_LOGIN_NAME_MAX];
char grname[_SC_LOGIN_NAME_MAX];
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if (iflag)
printf("%lu ", (unsigned long)ent->ino);
if (!lflag) {
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printf("%s%s\n", ent->name, indicator(ent->mode));
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return;
}
if (S_ISREG(ent->mode))
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mode[0] = '-';
else if (S_ISBLK(ent->mode))
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mode[0] = 'b';
else if (S_ISCHR(ent->mode))
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mode[0] = 'c';
else if (S_ISDIR(ent->mode))
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mode[0] = 'd';
else if (S_ISFIFO(ent->mode))
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mode[0] = 'p';
else if (S_ISLNK(ent->mode))
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mode[0] = 'l';
else if (S_ISSOCK(ent->mode))
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mode[0] = 's';
else
mode[0] = '?';
if (ent->mode & S_IRUSR) mode[1] = 'r';
if (ent->mode & S_IWUSR) mode[2] = 'w';
if (ent->mode & S_IXUSR) mode[3] = 'x';
if (ent->mode & S_IRGRP) mode[4] = 'r';
if (ent->mode & S_IWGRP) mode[5] = 'w';
if (ent->mode & S_IXGRP) mode[6] = 'x';
if (ent->mode & S_IROTH) mode[7] = 'r';
if (ent->mode & S_IWOTH) mode[8] = 'w';
if (ent->mode & S_IXOTH) mode[9] = 'x';
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if (ent->mode & S_ISUID) mode[3] = (mode[3] == 'x') ? 's' : 'S';
if (ent->mode & S_ISGID) mode[6] = (mode[6] == 'x') ? 's' : 'S';
if (ent->mode & S_ISVTX) mode[9] = (mode[9] == 'x') ? 't' : 'T';
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pw = getpwuid(ent->uid);
if (pw)
snprintf(pwname, sizeof(pwname), "%s", pw->pw_name);
else
snprintf(pwname, sizeof(pwname), "%d", ent->uid);
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gr = getgrgid(ent->gid);
if (gr)
snprintf(grname, sizeof(grname), "%s", gr->gr_name);
else
snprintf(grname, sizeof(grname), "%d", ent->gid);
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if (time(NULL) > ent->t + (180*24*60*60)) /* 6 months ago? */
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fmt = "%b %d %Y";
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else
fmt = "%b %d %H:%M";
strftime(buf, sizeof buf, fmt, localtime(&ent->t));
printf("%s %4ld %-8.8s %-8.8s ", mode, (long)ent->nlink, pwname, grname);
if (hflag)
printf("%10s ", humansize((unsigned long)ent->size));
else
printf("%10lu ", (unsigned long)ent->size);
printf("%s %s%s", buf, ent->name, indicator(ent->mode));
if (S_ISLNK(ent->mode)) {
if ((len = readlink(ent->name, buf, sizeof buf - 1)) < 0)
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eprintf("readlink %s:", ent->name);
buf[len] = '\0';
printf(" -> %s%s", buf, indicator(ent->tmode));
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}
putchar('\n');
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}