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582 lines
13 KiB
C
582 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* tiny-ls.c version 0.1.0: A minimalist 'ls'
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* Copyright (C) 1996 Brian Candler <B.Candler@pobox.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* To achieve a small memory footprint, this version of 'ls' doesn't do any
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* file sorting, and only has the most essential command line switches
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* (i.e. the ones I couldn't live without :-) All features which involve
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* linking in substantial chunks of libc can be disabled.
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*
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* Although I don't really want to add new features to this program to
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* keep it small, I *am* interested to receive bug fixes and ways to make
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* it more portable.
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*
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* KNOWN BUGS:
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* 1. ls -l of a directory doesn't give "total <blocks>" header
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* 2. ls of a symlink to a directory doesn't list directory contents
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* 3. hidden files can make column width too large
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*
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* NON-OPTIMAL BEHAVIOUR:
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* 1. autowidth reads directories twice
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* 2. if you do a short directory listing without filetype characters
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* appended, there's no need to stat each one
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* PORTABILITY:
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* 1. requires lstat (BSD) - how do you do it without?
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*/
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#define TERMINAL_WIDTH 80 /* use 79 if your terminal has linefold bug */
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#define COLUMN_WIDTH 14 /* default if AUTOWIDTH not defined */
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#define COLUMN_GAP 2 /* includes the file type char, if present */
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#define HAS_REWINDDIR
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/************************************************************************/
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#include "internal.h"
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#if !defined(__GLIBC__) && (__GLIBC__ >= 2) && (__GLIBC_MINOR__ >= 1)
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# include <linux/types.h>
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#else
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# include <sys/types.h>
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#endif
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#include <sys/stat.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <stdio.h>
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#ifdef BB_FEATURE_LS_TIMESTAMPS
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#include <time.h>
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#endif
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#define TYPEINDEX(mode) (((mode) >> 12) & 0x0f)
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#define TYPECHAR(mode) ("0pcCd?bB-?l?s???" [TYPEINDEX(mode)])
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#ifdef BB_FEATURE_LS_FILETYPES
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#define APPCHAR(mode) ("\0|\0\0/\0\0\0\0\0@\0=\0\0\0" [TYPEINDEX(mode)])
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#endif
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#define FMT_AUTO 0
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#define FMT_LONG 1 /* one record per line, extended info */
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#define FMT_SINGLE 2 /* one record per line */
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#define FMT_ROWS 3 /* print across rows */
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#define FMT_COLUMNS 3 /* fill columns (same, since we don't sort) */
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#define TIME_MOD 0
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#define TIME_CHANGE 1
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#define TIME_ACCESS 2
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#define DISP_FTYPE 1 /* show character for file type */
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#define DISP_EXEC 2 /* show '*' if regular executable file */
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#define DISP_HIDDEN 4 /* show files starting . (except . and ..) */
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#define DISP_DOT 8 /* show . and .. */
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#define DISP_NUMERIC 16 /* numeric uid and gid */
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#define DISP_FULLTIME 32 /* show extended time display */
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#define DIR_NOLIST 64 /* show directory as itself, not contents */
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#define DISP_DIRNAME 128 /* show directory name (for internal use) */
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#ifndef MAJOR
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#define MAJOR(dev) (((dev)>>8)&0xff)
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#define MINOR(dev) ((dev)&0xff)
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#endif
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static unsigned char display_fmt = FMT_AUTO;
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static unsigned short opts = 0;
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static unsigned short column = 0;
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#ifdef BB_FEATURE_AUTOWIDTH
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static unsigned short terminal_width = 0;
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static unsigned short column_width = 0;
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static unsigned short toplevel_column_width = 0;
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#else
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#define terminal_width TERMINAL_WIDTH
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#define column_width COLUMN_WIDTH
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#endif
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#ifdef BB_FEATURE_LS_TIMESTAMPS
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static unsigned char time_fmt = TIME_MOD;
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#endif
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#define wr(data,len) fwrite(data, 1, len, stdout)
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static void writenum(long val, short minwidth)
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{
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char scratch[128];
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char *p = scratch + sizeof(scratch);
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short len = 0;
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short neg = (val < 0);
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if (neg)
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val = -val;
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do
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*--p = (val % 10) + '0', len++, val /= 10;
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while (val);
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if (neg)
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*--p = '-', len++;
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while (len < minwidth)
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*--p = ' ', len++;
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wr(p, len);
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column += len;
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}
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static void newline(void)
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{
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if (column > 0) {
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wr("\n", 1);
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column = 0;
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}
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}
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static void tab(short col)
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{
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static const char spaces[] = " ";
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#define nspaces ((sizeof spaces)-1) /* null terminator! */
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short n = col - column;
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if (n > 0) {
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column = col;
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while (n > nspaces) {
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wr(spaces, nspaces);
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n -= nspaces;
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}
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/* must be 1...(sizeof spaces) left */
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wr(spaces, n);
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}
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#undef nspaces
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}
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#ifdef BB_FEATURE_LS_FILETYPES
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static char append_char(mode_t mode)
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{
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if (!(opts & DISP_FTYPE))
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return '\0';
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if ((opts & DISP_EXEC) && S_ISREG(mode)
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&& (mode & (S_IXUSR | S_IXGRP | S_IXOTH))) return '*';
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return APPCHAR(mode);
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}
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#endif
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/**
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**
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** Display a file or directory as a single item
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** (in either long or short format)
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**
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**/
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static void list_single(const char *name, struct stat *info,
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const char *fullname)
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{
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char scratch[PATH_MAX + 1];
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short len = strlen(name);
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#ifdef BB_FEATURE_LS_FILETYPES
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char append = append_char(info->st_mode);
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#endif
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if (display_fmt == FMT_LONG) {
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mode_t mode = info->st_mode;
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newline();
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wr(modeString(mode), 10);
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column = 10;
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writenum((long) info->st_nlink, (short) 5);
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fputs(" ", stdout);
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#ifdef BB_FEATURE_LS_USERNAME
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if (!(opts & DISP_NUMERIC)) {
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memset(scratch, 0, sizeof(scratch));
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my_getpwuid(scratch, info->st_uid);
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if (*scratch) {
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fputs(scratch, stdout);
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if (strlen(scratch) <= 8)
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wr(" ", 9 - strlen(scratch));
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} else {
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writenum((long) info->st_uid, (short) 8);
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fputs(" ", stdout);
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}
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} else
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#endif
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{
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writenum((long) info->st_uid, (short) 8);
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fputs(" ", stdout);
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}
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#ifdef BB_FEATURE_LS_USERNAME
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if (!(opts & DISP_NUMERIC)) {
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memset(scratch, 0, sizeof(scratch));
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my_getgrgid(scratch, info->st_gid);
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if (*scratch) {
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fputs(scratch, stdout);
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if (strlen(scratch) <= 8)
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wr(" ", 8 - strlen(scratch));
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} else
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writenum((long) info->st_gid, (short) 8);
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} else
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#endif
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writenum((long) info->st_gid, (short) 8);
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//tab(26);
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if (S_ISBLK(mode) || S_ISCHR(mode)) {
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writenum((long) MAJOR(info->st_rdev), (short) 3);
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fputs(", ", stdout);
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writenum((long) MINOR(info->st_rdev), (short) 3);
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} else
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writenum((long) info->st_size, (short) 8);
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fputs(" ", stdout);
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//tab(32);
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#ifdef BB_FEATURE_LS_TIMESTAMPS
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{
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time_t cal;
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char *string;
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switch (time_fmt) {
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case TIME_CHANGE:
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cal = info->st_ctime;
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break;
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case TIME_ACCESS:
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cal = info->st_atime;
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break;
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default:
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cal = info->st_mtime;
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break;
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}
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string = ctime(&cal);
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if (opts & DISP_FULLTIME)
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wr(string, 24);
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else {
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time_t age = time(NULL) - cal;
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wr(string + 4, 7); /* mmm_dd_ */
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if (age < 3600L * 24 * 365 / 2 && age > -15 * 60)
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/* hh:mm if less than 6 months old */
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wr(string + 11, 5);
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else
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/* _yyyy otherwise */
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wr(string + 19, 5);
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}
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wr(" ", 1);
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}
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#else
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fputs("--- -- ----- ", stdout);
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#endif
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wr(name, len);
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if (S_ISLNK(mode)) {
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wr(" -> ", 4);
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len = readlink(fullname, scratch, sizeof scratch);
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if (len > 0)
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fwrite(scratch, 1, len, stdout);
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#ifdef BB_FEATURE_LS_FILETYPES
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/* show type of destination */
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if (opts & DISP_FTYPE) {
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if (!stat(fullname, info)) {
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append = append_char(info->st_mode);
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if (append)
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fputc(append, stdout);
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}
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}
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#endif
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}
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#ifdef BB_FEATURE_LS_FILETYPES
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else if (append)
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wr(&append, 1);
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#endif
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} else {
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static short nexttab = 0;
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/* sort out column alignment */
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if (column == 0); /* nothing to do */
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else if (display_fmt == FMT_SINGLE)
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newline();
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else {
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if (nexttab + column_width > terminal_width
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#ifndef BB_FEATURE_AUTOWIDTH
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|| nexttab + len >= terminal_width
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#endif
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)
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newline();
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else
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tab(nexttab);
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}
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/* work out where next column starts */
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#ifdef BB_FEATURE_AUTOWIDTH
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/* we know the calculated width is big enough */
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nexttab = column + column_width + COLUMN_GAP;
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#else
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/* might cover more than one fixed-width column */
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nexttab = column;
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do
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nexttab += column_width + COLUMN_GAP;
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while (nexttab < (column + len + COLUMN_GAP));
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#endif
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/* now write the data */
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wr(name, len);
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column = column + len;
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#ifdef BB_FEATURE_LS_FILETYPES
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if (append)
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wr(&append, 1), column++;
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#endif
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}
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}
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/**
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**
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** List the given file or directory, expanding a directory
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** to show its contents if required
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**
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**/
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static int list_item(const char *name)
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{
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struct stat info;
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DIR *dir;
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struct dirent *entry;
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char fullname[MAXNAMLEN + 1], *fnend;
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if (lstat(name, &info))
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goto listerr;
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if (!S_ISDIR(info.st_mode) || (opts & DIR_NOLIST)) {
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#ifdef BB_FEATURE_AUTOWIDTH
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column_width = toplevel_column_width;
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#endif
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list_single(name, &info, name);
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return 0;
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}
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/* Otherwise, it's a directory we want to list the contents of */
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if (opts & DISP_DIRNAME) { /* identify the directory */
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if (column)
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wr("\n\n", 2), column = 0;
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wr(name, strlen(name));
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wr(":\n", 2);
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}
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dir = opendir(name);
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if (!dir)
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goto listerr;
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#ifdef BB_FEATURE_AUTOWIDTH
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column_width = 0;
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while ((entry = readdir(dir)) != NULL) {
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short w = strlen(entry->d_name);
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if (column_width < w)
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column_width = w;
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}
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#ifdef HAS_REWINDDIR
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rewinddir(dir);
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#else
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closedir(dir);
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dir = opendir(name);
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if (!dir)
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goto listerr;
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#endif
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#endif
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/* List the contents */
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strcpy(fullname, name); /* *** ignore '.' by itself */
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fnend = fullname + strlen(fullname);
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if (fnend[-1] != '/')
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*fnend++ = '/';
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while ((entry = readdir(dir)) != NULL) {
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const char *en = entry->d_name;
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if (en[0] == '.') {
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if (!en[1] || (en[1] == '.' && !en[2])) { /* . or .. */
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if (!(opts & DISP_DOT))
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continue;
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} else if (!(opts & DISP_HIDDEN))
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continue;
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}
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/* FIXME: avoid stat if not required */
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strcpy(fnend, entry->d_name);
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if (lstat(fullname, &info))
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goto direrr; /* (shouldn't fail) */
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list_single(entry->d_name, &info, fullname);
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}
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closedir(dir);
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if (opts & DISP_DIRNAME) { /* separate the directory */
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if (column) {
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wr("\n", 1);
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}
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wr("\n", 1);
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column = 0;
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}
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return 0;
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direrr:
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closedir(dir);
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listerr:
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newline();
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perror(name);
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return 1;
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}
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static const char ls_usage[] = "ls [-1a"
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#ifdef BB_FEATURE_LS_TIMESTAMPS
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"c"
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#endif
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"d"
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#ifdef BB_FEATURE_LS_TIMESTAMPS
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"e"
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|
#endif
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|
"ln"
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|
#ifdef BB_FEATURE_LS_FILETYPES
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|
"p"
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|
#endif
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|
#ifdef BB_FEATURE_LS_TIMESTAMPS
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|
"u"
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|
#endif
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"xAC"
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#ifdef BB_FEATURE_LS_FILETYPES
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"F"
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#endif
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"] [filenames...]\n\n"
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|
"Options:\n"
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"\t-a\tdo not hide entries starting with .\n"
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|
#ifdef BB_FEATURE_LS_TIMESTAMPS
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|
"\t-c\twith -l: show ctime (the time of last\n"
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"\t\tmodification of file status information)\n"
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|
#endif
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|
"\t-d\tlist directory entries instead of contents\n"
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|
#ifdef BB_FEATURE_LS_TIMESTAMPS
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|
"\t-e\tlist both full date and full time\n"
|
|
#endif
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|
"\t-l\tuse a long listing format\n"
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|
"\t-n\tlist numeric UIDs and GIDs instead of names\n"
|
|
#ifdef BB_FEATURE_LS_FILETYPES
|
|
"\t-p\tappend indicator (one of /=@|) to entries\n"
|
|
#endif
|
|
#ifdef BB_FEATURE_LS_TIMESTAMPS
|
|
"\t-u\twith -l: show access time (the time of last\n"
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|
"\t\taccess of the file)\n"
|
|
#endif
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|
"\t-x\tlist entries by lines instead of by columns\n"
|
|
"\t-A\tdo not list implied . and ..\n"
|
|
"\t-C\tlist entries by columns\n"
|
|
#ifdef BB_FEATURE_LS_FILETYPES
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|
"\t-F\tappend indicator (one of */=@|) to entries\n"
|
|
#endif
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|
;
|
|
|
|
extern int ls_main(int argc, char **argv)
|
|
{
|
|
int argi = 1, i;
|
|
|
|
/* process options */
|
|
while (argi < argc && argv[argi][0] == '-') {
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|
const char *p = &argv[argi][1];
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|
|
|
if (!*p)
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|
goto print_usage_message; /* "-" by itself not allowed */
|
|
if (*p == '-') {
|
|
if (!p[1]) { /* "--" forces end of options */
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|
argi++;
|
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break;
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}
|
|
/* it's a long option name - we don't support them */
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|
goto print_usage_message;
|
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}
|
|
|
|
while (*p)
|
|
switch (*p++) {
|
|
case 'l':
|
|
display_fmt = FMT_LONG;
|
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break;
|
|
case '1':
|
|
display_fmt = FMT_SINGLE;
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|
break;
|
|
case 'x':
|
|
display_fmt = FMT_ROWS;
|
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break;
|
|
case 'C':
|
|
display_fmt = FMT_COLUMNS;
|
|
break;
|
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#ifdef BB_FEATURE_LS_FILETYPES
|
|
case 'p':
|
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opts |= DISP_FTYPE;
|
|
break;
|
|
case 'F':
|
|
opts |= DISP_FTYPE | DISP_EXEC;
|
|
break;
|
|
#endif
|
|
case 'A':
|
|
opts |= DISP_HIDDEN;
|
|
break;
|
|
case 'a':
|
|
opts |= DISP_HIDDEN | DISP_DOT;
|
|
break;
|
|
case 'n':
|
|
opts |= DISP_NUMERIC;
|
|
break;
|
|
case 'd':
|
|
opts |= DIR_NOLIST;
|
|
break;
|
|
#ifdef BB_FEATURE_LS_TIMESTAMPS
|
|
case 'u':
|
|
time_fmt = TIME_ACCESS;
|
|
break;
|
|
case 'c':
|
|
time_fmt = TIME_CHANGE;
|
|
break;
|
|
case 'e':
|
|
opts |= DISP_FULLTIME;
|
|
break;
|
|
#endif
|
|
default:
|
|
goto print_usage_message;
|
|
}
|
|
|
|
argi++;
|
|
}
|
|
|
|
/* choose a display format */
|
|
if (display_fmt == FMT_AUTO)
|
|
display_fmt = isatty(fileno(stdout)) ? FMT_COLUMNS : FMT_SINGLE;
|
|
if (argi < argc - 1)
|
|
opts |= DISP_DIRNAME; /* 2 or more items? label directories */
|
|
#ifdef BB_FEATURE_AUTOWIDTH
|
|
/* could add a -w option and/or TIOCGWINSZ call */
|
|
if (terminal_width < 1)
|
|
terminal_width = TERMINAL_WIDTH;
|
|
|
|
for (i = argi; i < argc; i++) {
|
|
int len = strlen(argv[i]);
|
|
|
|
if (toplevel_column_width < len)
|
|
toplevel_column_width = len;
|
|
}
|
|
#endif
|
|
|
|
/* process files specified, or current directory if none */
|
|
i = 0;
|
|
if (argi == argc)
|
|
i = list_item(".");
|
|
while (argi < argc)
|
|
i |= list_item(argv[argi++]);
|
|
newline();
|
|
exit(i);
|
|
|
|
print_usage_message:
|
|
usage(ls_usage);
|
|
exit(FALSE);
|
|
}
|