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3294 post 1
/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
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 * All rights reserved.
3277 post 3
 *
3294 post 4
 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * Redistributions of source code must retain the above copyright notice, this
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 * list of conditions and the following disclaimer.
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 *
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 * Redistributions in binary form must reproduce the above copyright notice,
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 * this list of conditions and the following disclaimer in the documentation
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 * and/or other materials provided with the distribution.
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 *
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 * Neither the name of the original program's authors nor the names of its
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 * contributors may be used to endorse or promote products derived from this
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 * software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 * AND 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 COPYRIGHT OWNER OR CONTRIBUTORS BE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 * POSSIBILITY OF SUCH DAMAGE.
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 */
3277 post 30
 
3294 post 31
/* NOTE:
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 * This is a bit of an ugly hack, working around the absence of fstat / etc.
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 * As more stuff is completed and exposed in libc, this will improve */
3293 post 34
 
3277 post 35
#include <stdio.h>
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#include <stdlib.h>
3293 post 37
#include <unistd.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include "errors.h"
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#include "config.h"
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#include "util.h"
3277 post 47
#include "entry.h"
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#include "ls.h"
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#include "cmds.h"
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static char *cmdname = "ls";
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4341 svoboda 53
static inline off_t flen(const char *f)
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{
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    int fd;
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    off_t size;
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    fd = open(f, O_RDONLY);
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    if (fd == -1)
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        return 0;
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    size = lseek(fd, 0, SEEK_END);
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    close(fd);
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    if (size < 0)
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        size = 0;
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    return size;
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}
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3364 post 71
static unsigned int ls_scope(const char *path)
3293 post 72
{
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    int fd;
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    DIR *dirp;
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    dirp = opendir(path);
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    if (dirp) {
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        closedir(dirp);
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        return LS_DIR;
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    }
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    fd = open(path, O_RDONLY);
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    if (fd > 0) {
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        close(fd);
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        return LS_FILE;
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    }
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    return LS_BOGUS;
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}
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3364 post 91
static void ls_scan_dir(const char *d, DIR *dirp)
3293 post 92
{
3326 post 93
    struct dirent *dp;
3309 post 94
    unsigned int scope;
3326 post 95
    char *buff;
3309 post 96
 
3326 post 97
    if (! dirp)
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        return;
3309 post 99
 
3326 post 100
    buff = (char *)malloc(PATH_MAX);
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    if (NULL == buff) {
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        cli_error(CL_ENOMEM, "ls: failed to scan %s", d);
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        return;
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    }
3309 post 105
 
3326 post 106
    while ((dp = readdir(dirp))) {
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        memset(buff, 0, sizeof(buff));
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        /* Don't worry if inserting a double slash, this will be fixed by
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         * absolutize() later with subsequent calls to open() or readdir() */
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        snprintf(buff, PATH_MAX - 1, "%s/%s", d, dp->d_name);
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        scope = ls_scope(buff);
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        switch (scope) {
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        case LS_DIR:
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            ls_print_dir(dp->d_name);
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            break;
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        case LS_FILE:
4344 svoboda 117
            ls_print_file(dp->d_name, buff);
3326 post 118
            break;
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        case LS_BOGUS:
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            /* Odd chance it was deleted from the time readdir() found
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             * it and the time that it was scoped */
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            printf("ls: skipping bogus node %s\n", dp->d_name);
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            break;
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        }
3309 post 125
    }
3326 post 126
 
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    free(buff);
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3293 post 129
    return;
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}
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3326 post 132
/* ls_print_* currently does nothing more than print the entry.
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 * in the future, we will likely pass the absolute path, and
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 * some sort of ls_options structure that controls how each
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 * entry is printed and what is printed about it.
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 *
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 * Now we just print basic DOS style lists */
138
 
3364 post 139
static void ls_print_dir(const char *d)
3326 post 140
{
4341 svoboda 141
    printf("%-40s\t<dir>\n", d);
3326 post 142
 
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    return;
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}
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4344 svoboda 146
static void ls_print_file(const char *name, const char *pathname)
3326 post 147
{
4344 svoboda 148
    printf("%-40s\t%llu\n", name, (long long) flen(pathname));
3326 post 149
 
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    return;
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}
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3448 svoboda 153
void help_cmd_ls(unsigned int level)
3277 post 154
{
3294 post 155
    if (level == HELP_SHORT) {
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        printf("`%s' lists files and directories.\n", cmdname);
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    } else {
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        help_cmd_ls(HELP_SHORT);
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        printf("  `%s' [path], if no path is given the current "
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                "working directory is used.\n", cmdname);
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    }
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3448 svoboda 163
    return;
3277 post 164
}
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3448 svoboda 166
int cmd_ls(char **argv)
3277 post 167
{
168
    unsigned int argc;
3293 post 169
    unsigned int scope;
170
    char *buff;
171
    DIR *dirp;
172
 
3376 post 173
    argc = cli_count_args(argv);
3277 post 174
 
3293 post 175
    buff = (char *) malloc(PATH_MAX);
176
    if (NULL == buff) {
177
        cli_error(CL_ENOMEM, "%s: ", cmdname);
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        return CMD_FAILURE;
3277 post 179
    }
3293 post 180
    memset(buff, 0, sizeof(buff));
3277 post 181
 
3293 post 182
    if (argc == 1)
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        getcwd(buff, PATH_MAX);
184
    else
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        strncpy(buff, argv[1], PATH_MAX);
3277 post 186
 
3293 post 187
    scope = ls_scope(buff);
188
 
189
    switch (scope) {
190
    case LS_BOGUS:
191
        cli_error(CL_ENOENT, buff);
192
        free(buff);
193
        return CMD_FAILURE;
194
    case LS_FILE:
4344 svoboda 195
        ls_print_file(buff, buff);
3293 post 196
        break;
197
    case LS_DIR:
198
        dirp = opendir(buff);
3326 post 199
        if (! dirp) {
200
            /* May have been deleted between scoping it and opening it */
201
            cli_error(CL_EFAIL, "Could not stat %s", buff);
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            free(buff);
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            return CMD_FAILURE;
204
        }
205
        ls_scan_dir(buff, dirp);
3293 post 206
        closedir(dirp);
207
        break;
208
    }
209
 
210
    free(buff);
211
 
212
    return CMD_SUCCESS;
3277 post 213
}
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