1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
|
/* ls - list files and directories in the given path
* Copyright (C) 2022 Ferass EL HAFIDI
* Copyright (C) 2022 Leah Rowe
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#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;
}
|
