1 /* vi: set sw=4 ts=4: */
3 * tiny-ls.c version 0.1.0: A minimalist 'ls'
4 * Copyright (C) 1996 Brian Candler <B.Candler@pobox.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * To achieve a small memory footprint, this version of 'ls' doesn't do any
23 * file sorting, and only has the most essential command line switches
24 * (i.e. the ones I couldn't live without :-) All features which involve
25 * linking in substantial chunks of libc can be disabled.
27 * Although I don't really want to add new features to this program to
28 * keep it small, I *am* interested to receive bug fixes and ways to make
32 * 1. ls -l of a directory doesn't give "total <blocks>" header
33 * 2. ls of a symlink to a directory doesn't list directory contents
34 * 3. hidden files can make column width too large
36 * NON-OPTIMAL BEHAVIOUR:
37 * 1. autowidth reads directories twice
38 * 2. if you do a short directory listing without filetype characters
39 * appended, there's no need to stat each one
41 * 1. requires lstat (BSD) - how do you do it without?
44 #define TERMINAL_WIDTH 80 /* use 79 if your terminal has linefold bug */
45 #define COLUMN_WIDTH 14 /* default if AUTOWIDTH not defined */
46 #define COLUMN_GAP 2 /* includes the file type char, if present */
49 /************************************************************************/
52 #if !defined(__GLIBC__) && (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
53 # include <linux/types.h>
55 # include <sys/types.h>
63 #ifdef BB_FEATURE_LS_TIMESTAMPS
67 #define TYPEINDEX(mode) (((mode) >> 12) & 0x0f)
68 #define TYPECHAR(mode) ("0pcCd?bB-?l?s???" [TYPEINDEX(mode)])
69 #ifdef BB_FEATURE_LS_FILETYPES
70 #define APPCHAR(mode) ("\0|\0\0/\0\0\0\0\0@\0=\0\0\0" [TYPEINDEX(mode)])
74 #define MAJOR(dev) (((dev)>>8)&0xff)
75 #define MINOR(dev) ((dev)&0xff)
79 #define FMT_LONG 1 /* one record per line, extended info */
80 #define FMT_SINGLE 2 /* one record per line */
81 #define FMT_ROWS 3 /* print across rows */
82 #define FMT_COLUMNS 3 /* fill columns (same, since we don't sort) */
88 #define DISP_FTYPE 1 /* show character for file type */
89 #define DISP_EXEC 2 /* show '*' if regular executable file */
90 #define DISP_HIDDEN 4 /* show files starting . (except . and ..) */
91 #define DISP_DOT 8 /* show . and .. */
92 #define DISP_NUMERIC 16 /* numeric uid and gid */
93 #define DISP_FULLTIME 32 /* show extended time display */
94 #define DIR_NOLIST 64 /* show directory as itself, not contents */
95 #define DISP_DIRNAME 128 /* show directory name (for internal use) */
96 #define DIR_RECURSE 256 /* -R (not yet implemented) */
98 static unsigned char display_fmt = FMT_AUTO;
99 static unsigned short opts = 0;
100 static unsigned short column = 0;
102 #ifdef BB_FEATURE_AUTOWIDTH
103 static unsigned short terminal_width = 0;
104 static unsigned short column_width = 0;
105 static unsigned short toplevel_column_width = 0;
107 #define terminal_width TERMINAL_WIDTH
108 #define column_width COLUMN_WIDTH
111 #ifdef BB_FEATURE_LS_TIMESTAMPS
112 static unsigned char time_fmt = TIME_MOD;
115 #define wr(data,len) fwrite(data, 1, len, stdout)
117 static void writenum(long val, short minwidth)
121 char *p = scratch + sizeof(scratch);
123 short neg = (val < 0);
128 *--p = (val % 10) + '0', len++, val /= 10;
132 while (len < minwidth)
138 static void newline(void)
146 static void tab(short col)
148 static const char spaces[] = " ";
150 #define nspaces ((sizeof spaces)-1) /* null terminator! */
152 short n = col - column;
156 while (n > nspaces) {
160 /* must be 1...(sizeof spaces) left */
166 #ifdef BB_FEATURE_LS_FILETYPES
167 static char append_char(mode_t mode)
169 if (!(opts & DISP_FTYPE))
171 if ((opts & DISP_EXEC) && S_ISREG(mode)
172 && (mode & (S_IXUSR | S_IXGRP | S_IXOTH))) return '*';
173 return APPCHAR(mode);
179 ** Display a file or directory as a single item
180 ** (in either long or short format)
184 static void list_single(const char *name, struct stat *info,
185 const char *fullname)
187 char scratch[PATH_MAX + 1];
188 short len = strlen(name);
190 #ifdef BB_FEATURE_LS_FILETYPES
191 char append = append_char(info->st_mode);
194 if (display_fmt == FMT_LONG) {
195 mode_t mode = info->st_mode;
198 wr(modeString(mode), 10);
200 writenum((long) info->st_nlink, (short) 5);
202 #ifdef BB_FEATURE_LS_USERNAME
203 if (!(opts & DISP_NUMERIC)) {
204 memset(scratch, 0, sizeof(scratch));
205 my_getpwuid(scratch, info->st_uid);
207 fputs(scratch, stdout);
208 if (strlen(scratch) <= 8)
209 wr(" ", 9 - strlen(scratch));
211 writenum((long) info->st_uid, (short) 8);
217 writenum((long) info->st_uid, (short) 8);
220 #ifdef BB_FEATURE_LS_USERNAME
221 if (!(opts & DISP_NUMERIC)) {
222 memset(scratch, 0, sizeof(scratch));
223 my_getgrgid(scratch, info->st_gid);
225 fputs(scratch, stdout);
226 if (strlen(scratch) <= 8)
227 wr(" ", 8 - strlen(scratch));
229 writenum((long) info->st_gid, (short) 8);
232 writenum((long) info->st_gid, (short) 8);
234 if (S_ISBLK(mode) || S_ISCHR(mode)) {
235 writenum((long) MAJOR(info->st_rdev), (short) 3);
237 writenum((long) MINOR(info->st_rdev), (short) 3);
239 writenum((long) info->st_size, (short) 8);
242 #ifdef BB_FEATURE_LS_TIMESTAMPS
249 cal = info->st_ctime;
252 cal = info->st_atime;
255 cal = info->st_mtime;
258 string = ctime(&cal);
259 if (opts & DISP_FULLTIME)
262 time_t age = time(NULL) - cal;
264 wr(string + 4, 7); /* mmm_dd_ */
265 if (age < 3600L * 24 * 365 / 2 && age > -15 * 60)
266 /* hh:mm if less than 6 months old */
269 /* _yyyy otherwise */
275 fputs("--- -- ----- ", stdout);
280 len = readlink(fullname, scratch, sizeof scratch);
282 fwrite(scratch, 1, len, stdout);
283 #ifdef BB_FEATURE_LS_FILETYPES
284 /* show type of destination */
285 if (opts & DISP_FTYPE) {
286 if (!stat(fullname, info)) {
287 append = append_char(info->st_mode);
289 fputc(append, stdout);
294 #ifdef BB_FEATURE_LS_FILETYPES
299 static short nexttab = 0;
301 /* sort out column alignment */
302 if (column == 0); /* nothing to do */
303 else if (display_fmt == FMT_SINGLE)
306 if (nexttab + column_width > terminal_width
307 #ifndef BB_FEATURE_AUTOWIDTH
308 || nexttab + len >= terminal_width
315 /* work out where next column starts */
316 #ifdef BB_FEATURE_AUTOWIDTH
317 /* we know the calculated width is big enough */
318 nexttab = column + column_width + COLUMN_GAP;
320 /* might cover more than one fixed-width column */
323 nexttab += column_width + COLUMN_GAP;
324 while (nexttab < (column + len + COLUMN_GAP));
326 /* now write the data */
328 column = column + len;
329 #ifdef BB_FEATURE_LS_FILETYPES
331 wr(&append, 1), column++;
338 ** List the given file or directory, expanding a directory
339 ** to show its contents if required
343 static int list_item(const char *name)
347 struct dirent *entry;
348 char fullname[MAXNAMLEN + 1], *fnend;
350 if (lstat(name, &info))
353 if (!S_ISDIR(info.st_mode) || (opts & DIR_NOLIST)) {
354 #ifdef BB_FEATURE_AUTOWIDTH
355 column_width = toplevel_column_width;
357 list_single(name, &info, name);
361 /* Otherwise, it's a directory we want to list the contents of */
363 if (opts & DISP_DIRNAME) { /* identify the directory */
365 wr("\n\n", 2), column = 0;
366 wr(name, strlen(name));
373 #ifdef BB_FEATURE_AUTOWIDTH
375 while ((entry = readdir(dir)) != NULL) {
376 short w = strlen(entry->d_name);
378 if (column_width < w)
391 /* List the contents */
393 strcpy(fullname, name); /* *** ignore '.' by itself */
394 fnend = fullname + strlen(fullname);
395 if (fnend[-1] != '/')
398 while ((entry = readdir(dir)) != NULL) {
399 const char *en = entry->d_name;
402 if (!en[1] || (en[1] == '.' && !en[2])) { /* . or .. */
403 if (!(opts & DISP_DOT))
405 } else if (!(opts & DISP_HIDDEN))
408 /* FIXME: avoid stat if not required */
409 strcpy(fnend, entry->d_name);
410 if (lstat(fullname, &info))
411 goto direrr; /* (shouldn't fail) */
412 list_single(entry->d_name, &info, fullname);
416 if (opts & DISP_DIRNAME) { /* separate the directory */
434 static const char ls_usage[] = "ls [-1a"
435 #ifdef BB_FEATURE_LS_TIMESTAMPS
439 #ifdef BB_FEATURE_LS_TIMESTAMPS
443 #ifdef BB_FEATURE_LS_FILETYPES
446 #ifdef BB_FEATURE_LS_TIMESTAMPS
450 #ifdef BB_FEATURE_LS_FILETYPES
453 #ifdef FEATURE_RECURSIVE
456 "] [filenames...]\n";
458 extern int ls_main(int argc, char **argv)
462 /* process options */
463 while (argi < argc && argv[argi][0] == '-') {
464 const char *p = &argv[argi][1];
467 goto print_usage_message; /* "-" by itself not allowed */
469 if (!p[1]) { /* "--" forces end of options */
473 /* it's a long option name - we don't support them */
474 goto print_usage_message;
480 display_fmt = FMT_LONG;
483 display_fmt = FMT_SINGLE;
486 display_fmt = FMT_ROWS;
489 display_fmt = FMT_COLUMNS;
491 #ifdef BB_FEATURE_LS_FILETYPES
496 opts |= DISP_FTYPE | DISP_EXEC;
503 opts |= DISP_HIDDEN | DISP_DOT;
506 opts |= DISP_NUMERIC;
511 #ifdef FEATURE_RECURSIVE
516 #ifdef BB_FEATURE_LS_TIMESTAMPS
518 time_fmt = TIME_ACCESS;
521 time_fmt = TIME_CHANGE;
524 opts |= DISP_FULLTIME;
528 goto print_usage_message;
534 /* choose a display format */
535 if (display_fmt == FMT_AUTO)
536 display_fmt = isatty(fileno(stdout)) ? FMT_COLUMNS : FMT_SINGLE;
538 opts |= DISP_DIRNAME; /* 2 or more items? label directories */
539 #ifdef BB_FEATURE_AUTOWIDTH
540 /* could add a -w option and/or TIOCGWINSZ call */
541 if (terminal_width < 1)
542 terminal_width = TERMINAL_WIDTH;
544 for (i = argi; i < argc; i++) {
545 int len = strlen(argv[i]);
547 if (toplevel_column_width < len)
548 toplevel_column_width = len;
552 /* process files specified, or current directory if none */
557 i |= list_item(argv[argi++]);