source: mainline/uspace/app/bdsh/cmds/modules/ls/ls.c@ 6eb2e96

/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 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.
 *
 * Neither the name of the original program's authors 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 OWNER 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.
 */

/* NOTE:
 * This is a bit of an ugly hack, working around the absence of fstat / etc.
 * As more stuff is completed and exposed in libc, this will improve */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <string.h>

#include "errors.h"
#include "config.h"
#include "util.h"
#include "entry.h"
#include "ls.h"
#include "cmds.h"

static char *cmdname = "ls";

static inline off_t flen(const char *f)
{
        int fd;
        off_t size;

        fd = open(f, O_RDONLY);
        if (fd == -1)
                return 0;

        size = lseek(fd, 0, SEEK_END);
        close(fd);

        if (size < 0)
                size = 0;

        return size;
}

static unsigned int ls_scope(const char *path)
{
        int fd;
        DIR *dirp;

        dirp = opendir(path);
        if (dirp) {
                closedir(dirp);
                return LS_DIR;
        }

        fd = open(path, O_RDONLY);
        if (fd > 0) {
                close(fd);
                return LS_FILE;
        }

        return LS_BOGUS;
}

static void ls_scan_dir(const char *d, DIR *dirp)
{
        struct dirent *dp;
        unsigned int scope;
        char *buff;

        if (! dirp)
                return;

        buff = (char *)malloc(PATH_MAX);
        if (NULL == buff) {
                cli_error(CL_ENOMEM, "ls: failed to scan %s", d);
                return;
        }

        while ((dp = readdir(dirp))) {
                memset(buff, 0, sizeof(buff));
                /* Don't worry if inserting a double slash, this will be fixed by
                 * absolutize() later with subsequent calls to open() or readdir() */
                snprintf(buff, PATH_MAX - 1, "%s/%s", d, dp->d_name);
                scope = ls_scope(buff);
                switch (scope) {
                case LS_DIR:
                        ls_print_dir(dp->d_name);
                        break;
                case LS_FILE:
                        ls_print_file(dp->d_name, buff);
                        break;
                case LS_BOGUS:
                        /* Odd chance it was deleted from the time readdir() found
                         * it and the time that it was scoped */
                        printf("ls: skipping bogus node %s\n", dp->d_name);
                        break;
                }
        }

        free(buff);

        return;
}

/* ls_print_* currently does nothing more than print the entry.
 * in the future, we will likely pass the absolute path, and
 * some sort of ls_options structure that controls how each
 * entry is printed and what is printed about it.
 *
 * Now we just print basic DOS style lists */

static void ls_print_dir(const char *d)
{
        printf("%-40s\t<dir>\n", d);

        return;
}

static void ls_print_file(const char *name, const char *pathname)
{
        printf("%-40s\t%llu\n", name, (long long) flen(pathname));

        return;
}

void help_cmd_ls(unsigned int level)
{
        if (level == HELP_SHORT) {
                printf("`%s' lists files and directories.\n", cmdname);
        } else {
                help_cmd_ls(HELP_SHORT);
                printf("  `%s' [path], if no path is given the current "
                                "working directory is used.\n", cmdname);
        }

        return;
}

int cmd_ls(char **argv)
{
        unsigned int argc;
        unsigned int scope;
        char *buff;
        DIR *dirp;

        argc = cli_count_args(argv);

        buff = (char *) malloc(PATH_MAX);
        if (NULL == buff) {
                cli_error(CL_ENOMEM, "%s: ", cmdname);
                return CMD_FAILURE;
        }
        memset(buff, 0, sizeof(buff));

        if (argc == 1)
                getcwd(buff, PATH_MAX);
        else
                str_cpy(buff, PATH_MAX, argv[1]);

        scope = ls_scope(buff);

        switch (scope) {
        case LS_BOGUS:
                cli_error(CL_ENOENT, buff);
                free(buff);
                return CMD_FAILURE;
        case LS_FILE:
                ls_print_file(buff, buff);
                break;
        case LS_DIR:
                dirp = opendir(buff);
                if (! dirp) {
                        /* May have been deleted between scoping it and opening it */
                        cli_error(CL_EFAIL, "Could not stat %s", buff);
                        free(buff);
                        return CMD_FAILURE;
                }
                ls_scan_dir(buff, dirp);
                closedir(dirp);
                break;
        }

        free(buff);

        return CMD_SUCCESS;
}