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// SPDX-License-Identifier: GPL-2.0
/*
* lass.c - list files and directories in Kebab style
*/
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <string.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <time.h>
#include <math.h>
#include <limits.h>
static int cmp_entries(const void *a, const void *b)
{
const char *fa = *(const char **)a;
const char *fb = *(const char **)b;
return strcmp(fa, fb);
}
static void print_file_info(const char *path, const char *name, int width_uid,
int width_gid, int width_size)
{
struct stat st;
struct passwd *pw;
struct group *gr;
struct tm *timeinfo;
char time_buffer[64];
if (stat(path, &st))
return;
printf(S_ISDIR(st.st_mode) ? "d" :
S_ISSOCK(st.st_mode) ? "s" :
S_ISREG(st.st_mode) ? "-" :
S_ISLNK(st.st_mode) ? "l" :
S_ISCHR(st.st_mode) ? "c" :
S_ISBLK(st.st_mode) ? "b" :
S_ISFIFO(st.st_mode) ? "p" : "?");
printf((st.st_mode & 0400) ? "r" : "-");
printf((st.st_mode & 0200) ? "w" : "-");
printf((st.st_mode & 0100) ? "x" : "-");
printf((st.st_mode & 0040) ? "r" : "-");
printf((st.st_mode & 0020) ? "w" : "-");
printf((st.st_mode & 0010) ? "x" : "-");
printf((st.st_mode & 0004) ? "r" : "-");
printf((st.st_mode & 0002) ? "w" : "-");
printf((st.st_mode & 0001) ? "x" : "-");
pw = getpwuid(st.st_uid);
gr = getgrgid(st.st_gid);
printf(" %*s %*s ", width_uid, pw ? pw->pw_name : "?",
width_gid, gr ? gr->gr_name : "?");
timeinfo = localtime(&st.st_mtime);
strftime(time_buffer, sizeof(time_buffer),
"%a %b %d %H:%M:%S %Y", timeinfo);
printf("%s ", time_buffer);
if (S_ISSOCK(st.st_mode) || S_ISFIFO(st.st_mode))
printf("%*d ", width_size, 0);
else
printf("%*zu ", width_size, st.st_size);
printf("%s\n", name);
}
static int list_files(const char *path)
{
DIR *dir;
struct dirent *entry;
char **entries;
size_t file_count;
size_t capacity;
int width_uid;
int width_gid;
int width_size;
int size_digits;
struct stat st;
struct passwd *pw;
struct group *gr;
char fullpath[PATH_MAX];
file_count = 0;
capacity = 2;
width_uid = 0;
width_gid = 0;
width_size = 0;
if (stat(path, &st))
return 1;
if (!S_ISDIR(st.st_mode)) {
pw = getpwuid(st.st_uid);
gr = getgrgid(st.st_gid);
width_uid = pw ? strlen(pw->pw_name) : 1;
width_gid = gr ? strlen(gr->gr_name) : 1;
width_size = (st.st_size == 0) ? 1 : (int)log10(st.st_size) + 1;
print_file_info(path, path, width_uid, width_gid, width_size);
return 0;
}
dir = opendir(path);
if (!dir)
return 1;
entries = malloc(capacity * sizeof(char *));
if (!entries) {
closedir(dir);
return 1;
}
while ((entry = readdir(dir)) != NULL) {
if (file_count == capacity) {
capacity *= 2;
entries = realloc(entries, capacity * sizeof(char *));
if (!entries) {
closedir(dir);
return 1;
}
}
entries[file_count] = strdup(entry->d_name);
if (!entries[file_count])
continue;
snprintf(fullpath, sizeof(fullpath), "%s/%s", path,
entry->d_name);
if (stat(fullpath, &st))
continue;
pw = getpwuid(st.st_uid);
gr = getgrgid(st.st_gid);
size_digits = (st.st_size == 0) ? 1 : (int)log10(st.st_size)+1;
if (size_digits > width_size)
width_size = size_digits;
if (pw && (int)strlen(pw->pw_name) > width_uid)
width_uid = strlen(pw->pw_name);
if (gr && (int)strlen(gr->gr_name) > width_gid)
width_gid = strlen(gr->gr_name);
file_count++;
}
closedir(dir);
qsort(entries, file_count, sizeof(char *), cmp_entries);
for (size_t i = 0; i < file_count; i++) {
snprintf(fullpath, sizeof(fullpath), "%s/%s", path, entries[i]);
print_file_info(fullpath, entries[i], width_uid, width_gid,
width_size);
free(entries[i]);
}
free(entries);
return 0;
}
int main(int argc, char *argv[])
{
if (argc > 1)
return list_files(argv[1]);
return list_files(".");
}
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