320 lines
6.8 KiB
C
320 lines
6.8 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
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* The President and Fellows of Harvard College.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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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 <string.h>
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#include <errno.h>
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#include <err.h>
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/*
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* ls - list files.
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* Usage: ls [-adlRs] [files]
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* -a Show files whose names begin with a dot.
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* -d Don't list contents of directories specified on the command line.
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* -l Long format listing.
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* -R Recurse into subdirectories found.
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* -s (with -l) Show block counts.
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*/
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/* Flags for which options we're using. */
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static int aopt = 0;
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static int dopt = 0;
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static int lopt = 0;
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static int Ropt = 0;
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static int sopt = 0;
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/* Process an option character. */
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static void option(int ch) {
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switch (ch) {
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case 'a':
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aopt = 1;
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break;
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case 'd':
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dopt = 1;
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break;
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case 'l':
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lopt = 1;
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break;
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case 'R':
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Ropt = 1;
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break;
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case 's':
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sopt = 1;
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break;
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default:
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errx(1, "Unknown option -%c", ch);
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}
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}
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/*
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* Utility function to find the non-directory part of a pathname.
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*/
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static const char *basename(const char *path) {
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const char *s;
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s = strrchr(path, '/');
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if (s) {
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return s + 1;
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}
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return path;
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}
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/*
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* Utility function to check if a name refers to a directory.
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*/
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static int isdir(const char *path) {
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struct stat buf;
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int fd;
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/* Assume stat() may not be implemented; use fstat */
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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err(1, "%s", path);
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}
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if (fstat(fd, &buf) < 0) {
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err(1, "%s: fstat", path);
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}
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close(fd);
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return S_ISDIR(buf.st_mode);
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}
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/*
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* When listing one of several subdirectories, show the name of the
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* directory.
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*/
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static void printheader(const char *file) {
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/* No blank line before the first header */
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static int first = 1;
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if (first) {
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first = 0;
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} else {
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printf("\n");
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}
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printf("%s:\n", file);
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}
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/*
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* Show a single file.
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* We don't do the neat multicolumn listing that Unix ls does.
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*/
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static void print(const char *path) {
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struct stat statbuf;
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const char *file;
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int typech;
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if (lopt || sopt) {
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int fd;
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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err(1, "%s", path);
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}
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if (fstat(fd, &statbuf) < 0) {
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err(1, "%s: fstat", path);
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}
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close(fd);
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}
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file = basename(path);
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if (sopt) {
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printf("%3d ", statbuf.st_blocks);
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}
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if (lopt) {
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if (S_ISREG(statbuf.st_mode)) {
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typech = '-';
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} else if (S_ISDIR(statbuf.st_mode)) {
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typech = 'd';
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} else if (S_ISLNK(statbuf.st_mode)) {
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typech = 'l';
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} else if (S_ISCHR(statbuf.st_mode)) {
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typech = 'c';
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} else if (S_ISBLK(statbuf.st_mode)) {
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typech = 'b';
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} else {
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typech = '?';
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}
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printf("%crwx------ %2d root %-7llu ", typech, statbuf.st_nlink,
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statbuf.st_size);
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}
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printf("%s\n", file);
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}
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/*
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* List a directory.
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*/
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static void listdir(const char *path, int showheader) {
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int fd;
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char buf[1024];
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char newpath[1024];
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ssize_t len;
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if (showheader) {
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printheader(path);
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}
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/*
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* Open it.
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*/
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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err(1, "%s", path);
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}
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/*
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* List the directory.
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*/
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while ((len = getdirentry(fd, buf, sizeof(buf) - 1)) > 0) {
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buf[len] = 0;
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/* Assemble the full name of the new item */
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snprintf(newpath, sizeof(newpath), "%s/%s", path, buf);
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if (aopt || buf[0] != '.') {
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/* Print it */
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print(newpath);
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}
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}
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if (len < 0) {
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err(1, "%s: getdirentry", path);
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}
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/* Done */
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close(fd);
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}
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static void recursedir(const char *path) {
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int fd;
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char buf[1024];
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char newpath[1024];
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int len;
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/*
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* Open it.
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*/
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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err(1, "%s", path);
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}
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/*
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* List the directory.
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*/
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while ((len = getdirentry(fd, buf, sizeof(buf) - 1)) > 0) {
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buf[len] = 0;
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/* Assemble the full name of the new item */
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snprintf(newpath, sizeof(newpath), "%s/%s", path, buf);
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if (!aopt && buf[0] == '.') {
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/* skip this one */
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continue;
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}
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if (!strcmp(buf, ".") || !strcmp(buf, "..")) {
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/* always skip these */
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continue;
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}
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if (!isdir(newpath)) {
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continue;
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}
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listdir(newpath, 1 /*showheader*/);
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if (Ropt) {
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recursedir(newpath);
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}
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}
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if (len < 0) {
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err(1, "%s", path);
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}
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close(fd);
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}
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static void listitem(const char *path, int showheader) {
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if (!dopt && isdir(path)) {
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listdir(path, showheader || Ropt);
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if (Ropt) {
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recursedir(path);
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}
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} else {
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print(path);
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}
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}
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int main(int argc, char *argv[]) {
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int i, j, items = 0;
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/*
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* Go through the arguments and count how many non-option args.
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*/
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for (i = 1; i < argc; i++) {
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if (argv[i][0] != '-') {
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items++;
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}
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}
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/*
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* Now go through the options for real, processing them.
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*/
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for (i = 1; i < argc; i++) {
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if (argv[i][0] == '-') {
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/*
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* This word is an option.
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* Process all the option characters in it.
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*/
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for (j = 1; argv[i][j]; j++) {
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option(argv[i][j]);
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}
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} else {
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/*
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* This word isn't an option; list it.
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*/
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listitem(argv[i], items > 1);
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}
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}
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/*
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* If no filenames were specified to list, list the current
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* directory.
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*/
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if (items == 0) {
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listitem(".", 0);
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}
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return 0;
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}
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