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sbase/ls.c
Michael Forney 674d1636f8 ls: Fix sorting of named entries 
Previously, entcmp was being passed struct entry **, when it expected
struct entry *.

Many autoconf-generated configure scripts use `ls -t` to determine whether or
not the system clock is behaving correctly. If they are sorted in the wrong
order, it produces an error.

  checking whether build environment is sane... configure: error: newly created file is older than distributed files!
  Check your system clock
2015-11-01 09:36:41 +00:00

475 lines
9.1 KiB
C
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/* See LICENSE file for copyright and license details. */
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "utf.h"
#include "util.h"
struct entry {
char *name;
mode_t mode, tmode;
nlink_t nlink;
uid_t uid;
gid_t gid;
off_t size;
time_t t;
dev_t dev;
dev_t rdev;
ino_t ino, tino;
};
static struct {
dev_t dev;
ino_t ino;
} tree[PATH_MAX];
static int Aflag = 0;
static int aflag = 0;
static int cflag = 0;
static int dflag = 0;
static int Fflag = 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 nflag = 0;
static int pflag = 0;
static int qflag = 0;
static int Rflag = 0;
static int rflag = 0;
static int Uflag = 0;
static int uflag = 0;
static int first = 1;
static char sort = 0;
static void ls(const char *, const struct entry *, int);
static void
mkent(struct entry *ent, char *path, int dostat, int follow)
{
struct stat st;
ent->name = path;
if (!dostat)
return;
if ((follow ? stat : lstat)(path, &st) < 0)
eprintf("%s %s:", follow ? "stat" : "lstat", path);
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;
if (cflag)
ent->t = st.st_ctime;
else if (uflag)
ent->t = st.st_atime;
else
ent->t = st.st_mtime;
ent->dev = st.st_dev;
ent->rdev = st.st_rdev;
ent->ino = st.st_ino;
if (S_ISLNK(ent->mode)) {
if (stat(path, &st) == 0) {
ent->tmode = st.st_mode;
ent->dev = st.st_dev;
ent->tino = st.st_ino;
} else {
ent->tmode = ent->tino = 0;
}
}
}
static char *
indicator(mode_t mode)
{
if (pflag || Fflag)
if (S_ISDIR(mode))
return "/";
if (Fflag) {
if (S_ISLNK(mode))
return "@";
else if (S_ISFIFO(mode))
return "|";
else if (S_ISSOCK(mode))
return "=";
else if (mode & S_IXUSR || mode & S_IXGRP || mode & S_IXOTH)
return "*";
}
return "";
}
static void
output(const struct entry *ent)
{
struct group *gr;
struct passwd *pw;
ssize_t len;
size_t l;
char *name, *c, *u, *fmt, buf[BUFSIZ],
pwname[_SC_LOGIN_NAME_MAX], grname[_SC_LOGIN_NAME_MAX],
mode[] = "----------";
Rune r;
if (qflag) {
name = emalloc(strlen(ent->name) + 1);
for (c = name, u = ent->name; *u; u += l) {
l = chartorune(&r, u);
if (isprintrune(r)) {
memcpy(c, u, l);
c += l;
} else {
*c++ = '?';
}
}
*c = '\0';
} else {
name = ent->name;
}
if (iflag)
printf("%lu ", (unsigned long)ent->ino);
if (!lflag) {
printf("%s%s\n", name, indicator(ent->mode));
goto cleanup;
}
if (S_ISREG(ent->mode))
mode[0] = '-';
else if (S_ISBLK(ent->mode))
mode[0] = 'b';
else if (S_ISCHR(ent->mode))
mode[0] = 'c';
else if (S_ISDIR(ent->mode))
mode[0] = 'd';
else if (S_ISFIFO(ent->mode))
mode[0] = 'p';
else if (S_ISLNK(ent->mode))
mode[0] = 'l';
else if (S_ISSOCK(ent->mode))
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';
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';
if (!nflag && (pw = getpwuid(ent->uid)))
snprintf(pwname, sizeof(pwname), "%s", pw->pw_name);
else
snprintf(pwname, sizeof(pwname), "%d", ent->uid);
if (!nflag && (gr = getgrgid(ent->gid)))
snprintf(grname, sizeof(grname), "%s", gr->gr_name);
else
snprintf(grname, sizeof(grname), "%d", ent->gid);
if (time(NULL) > ent->t + (180 * 24 * 60 * 60)) /* 6 months ago? */
fmt = "%b %d %Y";
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 (S_ISBLK(ent->mode) || S_ISCHR(ent->mode))
printf("%4u, %4u ", major(ent->rdev), minor(ent->rdev));
else if (hflag)
printf("%10s ", humansize(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)
eprintf("readlink %s:", ent->name);
buf[len] = '\0';
printf(" -> %s%s", buf, indicator(ent->tmode));
}
putchar('\n');
cleanup:
if (qflag)
free(name);
}
static int
entcmp(const void *va, const void *vb)
{
int cmp = 0;
const struct entry *a = va, *b = vb;
switch (sort) {
case 'S':
cmp = b->size - a->size;
break;
case 't':
cmp = b->t - a->t;
break;
}
if (!cmp)
cmp = strcmp(a->name, b->name);
return rflag ? 0 - cmp : cmp;
}
static void
lsdir(const char *path, const struct entry *dir)
{
DIR *dp;
struct entry *ent, *ents = NULL;
struct dirent *d;
size_t i, n = 0;
char prefix[PATH_MAX];
if (!(dp = opendir(dir->name)))
eprintf("opendir %s:", dir->name);
if (chdir(dir->name) < 0)
eprintf("chdir %s:", dir->name);
while ((d = readdir(dp))) {
if (d->d_name[0] == '.' && !aflag && !Aflag)
continue;
else if (Aflag)
if (strcmp(d->d_name, ".") == 0 ||
strcmp(d->d_name, "..") == 0)
continue;
ents = ereallocarray(ents, ++n, sizeof(*ents));
mkent(&ents[n - 1], estrdup(d->d_name), Fflag || iflag ||
lflag || pflag || Rflag || sort, Lflag);
}
closedir(dp);
if (!Uflag)
qsort(ents, n, sizeof(*ents), entcmp);
if (path[0] || dir->name[0] != '.')
printf("%s:\n", dir->name);
for (i = 0; i < n; i++)
output(&ents[i]);
if (Rflag) {
if (snprintf(prefix, PATH_MAX, "%s%s/", path, dir->name) >=
PATH_MAX)
eprintf("path too long: %s%s\n", path, dir->name);
for (i = 0; i < n; i++) {
ent = &ents[i];
if (strcmp(ent->name, ".") == 0 ||
strcmp(ent->name, "..") == 0)
continue;
if (S_ISLNK(ent->mode) && S_ISDIR(ent->tmode) && !Lflag)
continue;
ls(prefix, ent, Rflag);
}
}
for (i = 0; i < n; ++i)
free(ents[i].name);
free(ents);
}
static int
visit(const struct entry *ent)
{
dev_t dev;
ino_t ino;
int i;
dev = ent->dev;
ino = S_ISLNK(ent->mode) ? ent->tino : ent->ino;
for (i = 0; tree[i].ino && i < PATH_MAX; ++i) {
if (ino == tree[i].ino && dev == tree[i].dev)
return -1;
}
tree[i].ino = ino;
tree[i].dev = dev;
return i;
}
static void
ls(const char *path, const struct entry *ent, int listdir)
{
int treeind;
char cwd[PATH_MAX];
if (!listdir) {
output(ent);
} else if (S_ISDIR(ent->mode) ||
(S_ISLNK(ent->mode) && S_ISDIR(ent->tmode))) {
if ((treeind = visit(ent)) < 0) {
fprintf(stderr, "%s%s: already visited\n",
path, ent->name);
return;
}
if (!getcwd(cwd, PATH_MAX))
eprintf("getcwd:");
if (first)
first = !first;
else
putchar('\n');
fputs(path, stdout);
lsdir(path, ent);
tree[treeind].ino = 0;
if (chdir(cwd) < 0)
eprintf("chdir %s:", cwd);
}
}
static void
usage(void)
{
eprintf("usage: %s [-1AacdFfHhiLlnpqRrtUu] [file ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
struct entry *ent, *dents, *fents;
size_t i, ds, fs;
ARGBEGIN {
case '1':
/* ignore */
break;
case 'A':
Aflag = 1;
break;
case 'a':
aflag = 1;
break;
case 'c':
cflag = 1;
uflag = 0;
break;
case 'd':
dflag = 1;
break;
case 'f':
aflag = 1;
fflag = 1;
Uflag = 1;
break;
case 'F':
Fflag = 1;
break;
case 'H':
Hflag = 1;
break;
case 'h':
hflag = 1;
break;
case 'i':
iflag = 1;
break;
case 'L':
Lflag = 1;
break;
case 'l':
lflag = 1;
break;
case 'n':
lflag = 1;
nflag = 1;
break;
case 'p':
pflag = 1;
break;
case 'q':
qflag = 1;
break;
case 'R':
Rflag = 1;
break;
case 'r':
rflag = 1;
break;
case 'S':
sort = 'S';
break;
case 't':
sort = 't';
break;
case 'U':
Uflag = 1;
break;
case 'u':
uflag = 1;
cflag = 0;
break;
default:
usage();
} ARGEND;
switch (argc) {
case 0: /* fallthrough */
*--argv = ".", ++argc;
case 1:
ent = emalloc(sizeof(*ent));
mkent(ent, argv[0], 1, Hflag || Lflag);
ls("", ent, (!dflag && S_ISDIR(ent->mode)) ||
((S_ISLNK(ent->mode) && S_ISDIR(ent->tmode)) &&
((Hflag || Lflag) || !(dflag || Fflag || lflag))));
break;
default:
for (i = ds = fs = 0, fents = dents = NULL; i < argc; ++i) {
if ((!dflag && S_ISDIR(ent->mode)) ||
((S_ISLNK(ent->mode) && S_ISDIR(ent->tmode)) &&
((Hflag || Lflag) || !(dflag || Fflag || lflag)))) {
dents = ereallocarray(dents, ++ds, sizeof(*dents));
ent = &dents[ds - 1];
} else {
fents = ereallocarray(fents, ++fs, sizeof(*fents));
ent = &fents[fs - 1];
}
mkent(ent, argv[i], 1, Hflag || Lflag);
}
qsort(fents, fs, sizeof(*fents), entcmp);
qsort(dents, ds, sizeof(*dents), entcmp);
for (i = 0; i < fs; ++i)
ls("", &fents[i], 0);
if (fs && ds)
putchar('\n');
for (i = 0; i < ds; ++i)
ls("", &dents[i], 1);
}
return fshut(stdout, "<stdout>");
}
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