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/* ls - list files and directories in the given path
* Copyright (C) 2022 Ferass EL HAFIDI
* Copyright (C) 2022 Leah Rowe
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <string.h>
#include <dirent.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <time.h>
#include <sys/ioctl.h>
#include "version.h"
#ifndef COMPILETIME
#define COMPILETIME
#endif
char param[256];
int getopt(int argc, char *const argv[], const char *optstring);
int ls(char *path);
void printUsage(char *params);
int main(int argc, char *argv[]) {
int status = 0;
int success = 0;
int argument, i;
char* params = "aACR1imlpgno";
for(i=0; i<256; i++) {
param[i]=0;
}
while ((argument = getopt(argc, argv, params)) != -1) {
if (argument == '?') {
printUsage(params);
return 1;
}
param[argument] = argument;
if (argument=='C') {
param['1'] = 0;
param['m'] = 0;
}
else if (argument=='1' || argument=='g' || argument=='n') {
param['m'] = 0;
param['C'] = 0;
}
else if (argument=='m') {
param['1'] = 0;
param['C'] = 0;
}
if (argument=='o' || argument=='n' || argument=='g') {
param['l'] = 'l';
}
}
if (status) {
if(!param['1']) printf("\n");
return status;
}
if (!param['C'] && !param['m'] && !param['1'])
param['1'] = '1';
if (param['l'] || param['g']) {
param['m'] = 0;
param['C'] = 0;
param['1'] = '1';
}
for (i = 1; i < argc; i++) {
if ((success |= (argv[i][0] != '-' ? 1 : 0))) {
if (!strcmp(argv[i],".")) status |= ls("./");
else status |= ls(argv[i]);
}
}
i = success ? status : ls("./");
if(!param['1'])
printf("\n");
return i;
}
void printUsage(char *params) {
printf("Ferass' Base System. (%s)\n\n"
"Usage: "
"ls [-%s] [directory] ...\n\n"
"Print <directory>'s contents to standard output.\n\n"
"\t-a\tInclude names starting with a dot, including '.' and '..'\n"
"\t-A\tSame as `-a` but don't include '.' and '..'\n"
"\t-C\tPrint in columns\n"
"\t-1\tPrint in lines\n"
"\t-R\tRecursively list directories\n"
"\t-i\tFor each file, write its serial number\n"
"\t-m\tList names followed by a comma and space character\n"
"\t-l\tDo not follow symbolic links named as operands and "
"write in long format (unfinished)\n"
"\t-p\tShow '/' after each name if that name is a directory\n"
"\t-g\tEnable the -l option but don't print the file owner's name\n"
"\t-n\tEnable the -l option but print the file owner and group's numeric "
"UID and GID instead of their name\n"
"\t-o\tEnable the -l option but don't print the file group's name\n",
COMPILETIME, params);
}
int ls(char *path) {
int file, dotname, cwdname, prevdir, dot;
long unsigned int cols_used;
DIR *directory, *subdirectory;
struct stat file_status;
struct dirent *dirtree;
struct winsize columns;
char *name, file_moddate[256];
char file_modes[] = "----------";
directory = opendir(path);
if (param['C']) {
ioctl(STDOUT_FILENO, TIOCGWINSZ, &columns);
cols_used = 0;
}
if (directory == NULL) {
file = open(path, O_RDONLY);
if (file == -1) return errno;
printf("%s\n", path);
close(file);
return errno;
}
if (param['R']) {
printf("The previous ls -R implementation had so much "
"flaws that it got removed from the ls codebase.\n");
return 0;
}
while ((dirtree = readdir(directory)) != NULL) {
name = dirtree->d_name;
cwdname = strcmp(name, ".") ? 0 : 1;
prevdir = strcmp(name, "..") ? 0 : 1;
dotname = (name[0]=='.' && !cwdname && !prevdir) ? 1 : 0;
dot = dotname | prevdir | cwdname;
if (dot && !param['a'] && !param['A']) continue;
if ((cwdname || prevdir) && param['A']) continue;
if (param['i']) printf("%lu ", dirtree->d_ino);
if (param['l']) {
char *fullpath = malloc(strlen(path) + strlen(name) + 2);
if (fullpath) {
strcpy(fullpath, path);
if (path[strlen(path) - 1] != '/') strcat(fullpath, "/");
strcat(fullpath, name);
}
lstat(fullpath, &file_status);
/* File modes */
/* File type */
{
if (S_ISBLK(file_status.st_mode)) file_modes[0] = 'b';
else if (S_ISCHR(file_status.st_mode)) file_modes[0] = 'c';
else if (S_ISDIR(file_status.st_mode)) file_modes[0] = 'd';
else if (S_ISFIFO(file_status.st_mode)) file_modes[0] = 'p';
else if (S_ISREG(file_status.st_mode)) file_modes[0] = '-';
else if (S_ISLNK(file_status.st_mode)) file_modes[0] = 'l';
else file_modes[0] = 's';
}
/* User */
{
if (file_status.st_mode & S_IRUSR) file_modes[1] = 'r';
if (file_status.st_mode & S_IWUSR) file_modes[2] = 'w';
if (file_status.st_mode & S_IXUSR) file_modes[3] = 'x';
}
/* Group */
{
if (file_status.st_mode & S_IRGRP) file_modes[4] = 'r';
if (file_status.st_mode & S_IWGRP) file_modes[5] = 'w';
if (file_status.st_mode & S_IXGRP) file_modes[6] = 'x';
}
/* Others */
{
if (file_status.st_mode & S_IROTH) file_modes[7] = 'r';
if (file_status.st_mode & S_IWOTH) file_modes[8] = 'w';
if (file_status.st_mode & S_IXOTH) file_modes[9] = 'x';
}
printf("%s ", file_modes);
/* Number of links */
printf("%lu ", file_status.st_nlink);
/* Owner name/uid */
if (!param['g'])
/* This recursiveness is needed for whatever reason,
* else it doesn't work...
*/
if (!param['n'])
printf("%s ", getpwuid(file_status.st_uid)->pw_name);
if (param['n']) printf("%u ", file_status.st_uid);
/* Group name/gid */
if (!param['o'])
if (!param['n']) printf("%s ", getgrgid(file_status.st_gid)->gr_name);
if (param['n']) printf("%u ", file_status.st_gid);
/* Size of file */
printf("%lu ", file_status.st_size);
/* Date and time */
int strftime_status = strftime(file_moddate, sizeof(file_moddate),
"%b %e %H:%MM", localtime(&file_status.st_mtime));
/* It should be st_mtim right? */
file_moddate[strlen(file_moddate) - 1] = 0; /* Remove newline */
printf("%s ", strftime_status ? file_moddate : "<strftime() returned 0>");
free(fullpath);
}
printf("%s", name);
if (param['p']) {
char *fullpath = malloc(strlen(path) + strlen(name) + 2);
if (fullpath) {
strcpy(fullpath, path);
if (path[strlen(path) - 1] != '/') strcat(fullpath, "/");
strcat(fullpath, name);
}
stat(fullpath, &file_status);
if (S_ISDIR(file_status.st_mode)) printf("/");
free(fullpath);
}
if (param['C']) {
if (cols_used < (long unsigned int)((columns.ws_col) / 12)) {
for (long unsigned int i = strlen(name); i < 11; i++) printf(" ");
cols_used++;
}
if (cols_used == (long unsigned int)((columns.ws_col) / 12)) {
printf("\n");
cols_used = 0;
}
}
else if (param['1'])
printf("\n");
else if (param['m'])
printf(", ");
}
closedir(directory);
return errno;
}
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