Initial revision
diff --git a/ls.c b/ls.c
new file mode 100644
index 0000000..2566bee
--- /dev/null
+++ b/ls.c
@@ -0,0 +1,542 @@
+#include "internal.h"
+/*
+ * tiny-ls.c version 0.1.0: A minimalist 'ls'
+ * Copyright (C) 1996 Brian Candler <B.Candler@pobox.com>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+/*
+ * To achieve a small memory footprint, this version of 'ls' doesn't do any
+ * file sorting, and only has the most essential command line switches
+ * (i.e. the ones I couldn't live without :-) All features which involve
+ * linking in substantial chunks of libc can be disabled.
+ *
+ * Although I don't really want to add new features to this program to
+ * keep it small, I *am* interested to receive bug fixes and ways to make
+ * it more portable.
+ *
+ * KNOWN BUGS:
+ * 1. messy output if you mix files and directories on the command line
+ * 2. ls -l of a directory doesn't give "total <blocks>" header
+ * 3. ls of a symlink to a directory doesn't list directory contents
+ * 4. hidden files can make column width too large
+ * NON-OPTIMAL BEHAVIOUR:
+ * 1. autowidth reads directories twice
+ * 2. if you do a short directory listing without filetype characters
+ * appended, there's no need to stat each one
+ * PORTABILITY:
+ * 1. requires lstat (BSD) - how do you do it without?
+ */
+
+#define FEATURE_USERNAME /* show username/groupnames (libc6 uses NSS) */
+#define FEATURE_TIMESTAMPS /* show file timestamps */
+#define FEATURE_AUTOWIDTH /* calculate terminal & column widths */
+#define FEATURE_FILETYPECHAR /* enable -p and -F */
+
+#undef OP_BUF_SIZE 1024 /* leave undefined for unbuffered output */
+
+#define TERMINAL_WIDTH 80 /* use 79 if your terminal has linefold bug */
+#define COLUMN_WIDTH 14 /* default if AUTOWIDTH not defined */
+#define COLUMN_GAP 2 /* includes the file type char, if present */
+
+/************************************************************************/
+
+#define HAS_REWINDDIR
+
+#if 1 /* FIXME libc 6 */
+# include <linux/types.h>
+#else
+# include <sys/types.h>
+#endif
+#include <sys/stat.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <errno.h>
+#include <stdio.h>
+#ifdef FEATURE_USERNAME
+#include <pwd.h>
+#include <grp.h>
+#endif
+#ifdef FEATURE_TIMESTAMPS
+#include <time.h>
+#endif
+
+#define TYPEINDEX(mode) (((mode) >> 12) & 0x0f)
+#define TYPECHAR(mode) ("0pcCd?bB-?l?s???" [TYPEINDEX(mode)])
+#ifdef FEATURE_FILETYPECHAR
+#define APPCHAR(mode) ("\0|\0\0/\0\0\0\0\0@\0=\0\0\0" [TYPEINDEX(mode)])
+#endif
+
+#ifndef MAJOR
+#define MAJOR(dev) (((dev)>>8)&0xff)
+#define MINOR(dev) ((dev)&0xff)
+#endif
+
+#define MODE1 "rwxrwxrwx"
+#define MODE0 "---------"
+#define SMODE1 "..s..s..t"
+#define SMODE0 "..S..S..T"
+
+/* The 9 mode bits to test */
+
+static const umode_t MBIT[] = {
+ S_IRUSR, S_IWUSR, S_IXUSR,
+ S_IRGRP, S_IWGRP, S_IXGRP,
+ S_IROTH, S_IWOTH, S_IXOTH
+};
+
+/* The special bits. If set, display SMODE0/1 instead of MODE0/1 */
+
+static const umode_t SBIT[] = {
+ 0, 0, S_ISUID,
+ 0, 0, S_ISGID,
+ 0, 0, S_ISVTX
+};
+
+#define FMT_AUTO 0
+#define FMT_LONG 1 /* one record per line, extended info */
+#define FMT_SINGLE 2 /* one record per line */
+#define FMT_ROWS 3 /* print across rows */
+#define FMT_COLUMNS 3 /* fill columns (same, since we don't sort) */
+
+#define TIME_MOD 0
+#define TIME_CHANGE 1
+#define TIME_ACCESS 2
+
+#define DISP_FTYPE 1 /* show character for file type */
+#define DISP_EXEC 2 /* show '*' if regular executable file */
+#define DISP_HIDDEN 4 /* show files starting . (except . and ..) */
+#define DISP_DOT 8 /* show . and .. */
+#define DISP_NUMERIC 16 /* numeric uid and gid */
+#define DISP_FULLTIME 32 /* show extended time display */
+#define DIR_NOLIST 64 /* show directory as itself, not contents */
+#define DISP_DIRNAME 128 /* show directory name (for internal use) */
+#define DIR_RECURSE 256 /* -R (not yet implemented) */
+
+static unsigned char display_fmt = FMT_AUTO;
+static unsigned short opts = 0;
+static unsigned short column = 0;
+
+#ifdef FEATURE_AUTOWIDTH
+static unsigned short terminal_width = 0, column_width = 0;
+#else
+#define terminal_width TERMINAL_WIDTH
+#define column_width COLUMN_WIDTH
+#endif
+
+#ifdef FEATURE_TIMESTAMPS
+static unsigned char time_fmt = TIME_MOD;
+#endif
+
+#define wr(data,len) fwrite(data, 1, len, stdout)
+
+static void writenum(long val, short minwidth)
+{
+ char scratch[20];
+
+ char *p = scratch + sizeof(scratch);
+ short len = 0;
+ short neg = (val < 0);
+
+ if (neg) val = -val;
+ do
+ *--p = (val % 10) + '0', len++, val /= 10;
+ while (val);
+ if (neg)
+ *--p = '-', len++;
+ while (len < minwidth)
+ *--p = ' ', len++;
+ wr(p, len);
+ column += len;
+}
+
+static void newline(void)
+{
+ if (column > 0) {
+ wr("\n", 1);
+ column = 0;
+ }
+}
+
+static void tab(short col)
+{
+ static const char spaces[] = " ";
+ #define nspaces ((sizeof spaces)-1) /* null terminator! */
+
+ short n = col - column;
+
+ if (n > 0) {
+ column = col;
+ while (n > nspaces) {
+ wr(spaces, nspaces);
+ n -= nspaces;
+ }
+ /* must be 1...(sizeof spaces) left */
+ wr(spaces, n);
+ }
+ #undef nspaces
+}
+
+#ifdef FEATURE_FILETYPECHAR
+static char append_char(umode_t mode)
+{
+ if (!(opts & DISP_FTYPE))
+ return '\0';
+ if ((opts & DISP_EXEC) && S_ISREG(mode) && (mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
+ return '*';
+ return APPCHAR(mode);
+}
+#endif
+
+/**
+ **
+ ** Display a file or directory as a single item
+ ** (in either long or short format)
+ **
+ **/
+
+static void list_single(const char *name, struct stat *info)
+{
+ char scratch[20];
+ short len = strlen(name);
+#ifdef FEATURE_FILETYPECHAR
+ char append = append_char(info->st_mode);
+#endif
+
+ if (display_fmt == FMT_LONG) {
+ umode_t mode = info->st_mode;
+ int i;
+
+ scratch[0] = TYPECHAR(mode);
+ for (i=0; i<9; i++)
+ if (mode & SBIT[i])
+ scratch[i+1] = (mode & MBIT[i])
+ ? SMODE1[i]
+ : SMODE0[i];
+ else
+ scratch[i+1] = (mode & MBIT[i])
+ ? MODE1[i]
+ : MODE0[i];
+ newline();
+ wr(scratch, 10);
+ column=10;
+ writenum((long)info->st_nlink,(short)4);
+ fputs(" ", stdout);
+#ifdef FEATURE_USERNAME
+ if (!(opts & DISP_NUMERIC)) {
+ struct passwd *pw = getpwuid(info->st_uid);
+ if (pw)
+ fputs(pw->pw_name, stdout);
+ else
+ writenum((long)info->st_uid,(short)0);
+ } else
+#endif
+ writenum((long)info->st_uid,(short)0);
+ tab(24);
+#ifdef FEATURE_USERNAME
+ if (!(opts & DISP_NUMERIC)) {
+ struct group *gr = getgrgid(info->st_gid);
+ if (gr)
+ fputs(gr->gr_name, stdout);
+ else
+ writenum((long)info->st_gid,(short)0);
+ } else
+#endif
+ writenum((long)info->st_gid,(short)0);
+ tab(33);
+ if (S_ISBLK(mode) || S_ISCHR(mode)) {
+ writenum((long)MAJOR(info->st_rdev),(short)3);
+ fputs(", ", stdout);
+ writenum((long)MINOR(info->st_rdev),(short)3);
+ }
+ else
+ writenum((long)info->st_size,(short)8);
+ fputs(" ", stdout);
+#ifdef FEATURE_TIMESTAMPS
+ {
+ time_t cal;
+ char *string;
+
+ switch(time_fmt) {
+ case TIME_CHANGE:
+ cal=info->st_ctime; break;
+ case TIME_ACCESS:
+ cal=info->st_atime; break;
+ default:
+ cal=info->st_mtime; break;
+ }
+ string=ctime(&cal);
+ if (opts & DISP_FULLTIME)
+ wr(string,24);
+ else {
+ time_t age = time(NULL) - cal;
+ wr(string+4,7); /* mmm_dd_ */
+ if(age < 3600L*24*365/2 && age > -15*60)
+ /* hh:mm if less than 6 months old */
+ wr(string+11,5);
+ else
+ /* _yyyy otherwise */
+ wr(string+19,5);
+ }
+ wr(" ", 1);
+ }
+#else
+ fputs("--- -- ----- ", stdout);
+#endif
+ wr(name, len);
+ if (S_ISLNK(mode)) {
+ wr(" -> ", 4);
+ len = readlink(name, scratch, sizeof scratch);
+ if (len > 0) fwrite(scratch, 1, len, stdout);
+#ifdef FEATURE_FILETYPECHAR
+ /* show type of destination */
+ if (opts & DISP_FTYPE) {
+ if (!stat(name, info)) {
+ append = append_char(info->st_mode);
+ if (append)
+ fputc(append, stdout);
+ }
+ }
+#endif
+ }
+#ifdef FEATURE_FILETYPECHAR
+ else if (append)
+ wr(&append, 1);
+#endif
+ } else {
+ static short nexttab = 0;
+
+ /* sort out column alignment */
+ if (column == 0)
+ ; /* nothing to do */
+ else if (display_fmt == FMT_SINGLE)
+ newline();
+ else {
+ if (nexttab + column_width > terminal_width
+#ifndef FEATURE_AUTOWIDTH
+ || nexttab + len >= terminal_width
+#endif
+ )
+ newline();
+ else
+ tab(nexttab);
+ }
+ /* work out where next column starts */
+#ifdef FEATURE_AUTOWIDTH
+ /* we know the calculated width is big enough */
+ nexttab = column + column_width + COLUMN_GAP;
+#else
+ /* might cover more than one fixed-width column */
+ nexttab = column;
+ do
+ nexttab += column_width + COLUMN_GAP;
+ while (nexttab < (column + len + COLUMN_GAP));
+#endif
+ /* now write the data */
+ wr(name, len);
+ column = column + len;
+#ifdef FEATURE_FILETYPECHAR
+ if (append)
+ wr(&append, 1), column++;
+#endif
+ }
+}
+
+/**
+ **
+ ** List the given file or directory, expanding a directory
+ ** to show its contents if required
+ **
+ **/
+
+static int list_item(const char *name)
+{
+ struct stat info;
+ DIR *dir;
+ struct dirent *entry;
+ char fullname[MAXNAMLEN+1], *fnend;
+
+ if (lstat(name, &info))
+ goto listerr;
+
+ if (!S_ISDIR(info.st_mode) ||
+ (opts & DIR_NOLIST)) {
+ list_single(name, &info);
+ return 0;
+ }
+
+ /* Otherwise, it's a directory we want to list the contents of */
+
+ if (opts & DISP_DIRNAME) { /* identify the directory */
+ if (column)
+ wr("\n\n", 2), column = 0;
+ wr(name, strlen(name));
+ wr(":\n", 2);
+ }
+
+ dir = opendir(name);
+ if (!dir) goto listerr;
+#ifdef FEATURE_AUTOWIDTH
+ column_width = 0;
+ while ((entry = readdir(dir)) != NULL) {
+ short w = strlen(entry->d_name);
+ if (column_width < w)
+ column_width = w;
+ }
+#ifdef HAS_REWINDDIR
+ rewinddir(dir);
+#else
+ closedir(dir);
+ dir = opendir(name);
+ if (!dir) goto listerr;
+#endif
+#endif
+
+ /* List the contents */
+
+ strcpy(fullname,name); /* *** ignore '.' by itself */
+ fnend=fullname+strlen(fullname);
+ if (fnend[-1] != '/')
+ *fnend++ = '/';
+
+ while ((entry = readdir(dir)) != NULL) {
+ const char *en=entry->d_name;
+ if (en[0] == '.') {
+ if (!en[1] || (en[1] == '.' && !en[2])) { /* . or .. */
+ if (!(opts & DISP_DOT))
+ continue;
+ }
+ else if (!(opts & DISP_HIDDEN))
+ continue;
+ }
+ /* FIXME: avoid stat if not required */
+ strcpy(fnend, entry->d_name);
+ if (lstat(fullname, &info))
+ goto direrr; /* (shouldn't fail) */
+ list_single(entry->d_name, &info);
+ }
+ closedir(dir);
+ return 0;
+
+direrr:
+ closedir(dir);
+listerr:
+ newline();
+ name_and_error(name);
+ return 1;
+}
+
+const char ls_usage[] = "Usage: ls [-1a"
+#ifdef FEATURE_TIMESTAMPS
+ "c"
+#endif
+ "d"
+#ifdef FEATURE_TIMESTAMPS
+ "e"
+#endif
+ "ln"
+#ifdef FEATURE_FILETYPECHAR
+ "p"
+#endif
+#ifdef FEATURE_TIMESTAMPS
+ "u"
+#endif
+ "xAC"
+#ifdef FEATURE_FILETYPECHAR
+ "F"
+#endif
+#ifdef FEATURE_RECURSIVE
+ "R"
+#endif
+ "] [filenames...]\n";
+
+extern int
+ls_main(struct FileInfo * not_used, int argc, char * * argv)
+{
+ int argi=1, i;
+
+ /* process options */
+ while (argi < argc && argv[argi][0] == '-') {
+ const char *p = &argv[argi][1];
+
+ if (!*p) goto print_usage_message; /* "-" by itself not allowed */
+ if (*p == '-') {
+ if (!p[1]) { /* "--" forces end of options */
+ argi++;
+ break;
+ }
+ /* it's a long option name - we don't support them */
+ goto print_usage_message;
+ }
+
+ while (*p)
+ switch (*p++) {
+ case 'l': display_fmt = FMT_LONG; break;
+ case '1': display_fmt = FMT_SINGLE; break;
+ case 'x': display_fmt = FMT_ROWS; break;
+ case 'C': display_fmt = FMT_COLUMNS; break;
+#ifdef FEATURE_FILETYPECHAR
+ case 'p': 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 FEATURE_RECURSIVE
+ case 'R': opts |= DIR_RECURSE; break;
+#endif
+#ifdef FEATURE_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(STDOUT_FILENO) ? FMT_COLUMNS : FMT_SINGLE;
+ if (argi < argc - 1)
+ opts |= DISP_DIRNAME; /* 2 or more items? label directories */
+#ifdef 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 (column_width < len)
+ 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();
+ return i;
+
+print_usage_message:
+ usage(ls_usage);
+ return 1;
+}