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  1. /* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
  2.  * All rights reserved.
  3.  *
  4.  * Redistribution and use in source and binary forms, with or without
  5.  * modification, are permitted provided that the following conditions are met:
  6.  *
  7.  * Redistributions of source code must retain the above copyright notice, this
  8.  * list of conditions and the following disclaimer.
  9.  *
  10.  * Redistributions in binary form must reproduce the above copyright notice,
  11.  * this list of conditions and the following disclaimer in the documentation
  12.  * and/or other materials provided with the distribution.
  13.  *
  14.  * Neither the name of the original program's authors nor the names of its
  15.  * contributors may be used to endorse or promote products derived from this
  16.  * software without specific prior written permission.
  17.  *
  18.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19.  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20.  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21.  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  22.  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23.  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24.  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25.  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26.  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27.  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28.  * POSSIBILITY OF SUCH DAMAGE.
  29.  */
  30.  
  31. /* NOTE:
  32.  * This is a bit of an ugly hack, working around the absence of fstat / etc.
  33.  * As more stuff is completed and exposed in libc, this will improve */
  34.  
  35. #include <stdio.h>
  36. #include <stdlib.h>
  37. #include <unistd.h>
  38. #include <dirent.h>
  39. #include <fcntl.h>
  40. #include <sys/types.h>
  41. #include <sys/stat.h>
  42. #include <string.h>
  43.  
  44. #include "errors.h"
  45. #include "config.h"
  46. #include "util.h"
  47. #include "entry.h"
  48. #include "ls.h"
  49. #include "cmds.h"
  50.  
  51. static char *cmdname = "ls";
  52.  
  53. static void ls_scan_dir(const char *d, DIR *dirp)
  54. {
  55.     struct dirent *dp;
  56.     char *buff;
  57.  
  58.     if (! dirp)
  59.         return;
  60.  
  61.     buff = (char *)malloc(PATH_MAX);
  62.     if (NULL == buff) {
  63.         cli_error(CL_ENOMEM, "ls: failed to scan %s", d);
  64.         return;
  65.     }
  66.  
  67.     while ((dp = readdir(dirp))) {
  68.         memset(buff, 0, sizeof(buff));
  69.         /* Don't worry if inserting a double slash, this will be fixed by
  70.          * absolutize() later with subsequent calls to open() or readdir() */
  71.         snprintf(buff, PATH_MAX - 1, "%s/%s", d, dp->d_name);
  72.         ls_print(dp->d_name, buff);
  73.     }
  74.  
  75.     free(buff);
  76.  
  77.     return;
  78. }
  79.  
  80. /* ls_print currently does nothing more than print the entry.
  81.  * in the future, we will likely pass the absolute path, and
  82.  * some sort of ls_options structure that controls how each
  83.  * entry is printed and what is printed about it.
  84.  *
  85.  * Now we just print basic DOS style lists */
  86.  
  87. static void ls_print(const char *name, const char *pathname)
  88. {
  89.     struct stat s;
  90.     int rc;
  91.  
  92.     rc = stat(pathname, &s);
  93.     if (rc != 0) {
  94.         /* Odd chance it was deleted from the time readdir() found it */
  95.         printf("ls: skipping bogus node %s\n", pathname);
  96.         printf("rc=%d\n", rc);
  97.         return;
  98.     }
  99.    
  100.     if (s.is_file)
  101.         printf("%-40s\t%llu\n", name, (long long) s.size);
  102.     else
  103.         printf("%-40s\n", name);
  104.  
  105.     return;
  106. }
  107.  
  108. void help_cmd_ls(unsigned int level)
  109. {
  110.     if (level == HELP_SHORT) {
  111.         printf("`%s' lists files and directories.\n", cmdname);
  112.     } else {
  113.         help_cmd_ls(HELP_SHORT);
  114.         printf("  `%s' [path], if no path is given the current "
  115.                 "working directory is used.\n", cmdname);
  116.     }
  117.  
  118.     return;
  119. }
  120.  
  121. int cmd_ls(char **argv)
  122. {
  123.     unsigned int argc;
  124.     struct stat s;
  125.     char *buff;
  126.     DIR *dirp;
  127.  
  128.     argc = cli_count_args(argv);
  129.  
  130.     buff = (char *) malloc(PATH_MAX);
  131.     if (NULL == buff) {
  132.         cli_error(CL_ENOMEM, "%s: ", cmdname);
  133.         return CMD_FAILURE;
  134.     }
  135.     memset(buff, 0, sizeof(buff));
  136.  
  137.     if (argc == 1)
  138.         getcwd(buff, PATH_MAX);
  139.     else
  140.         str_cpy(buff, PATH_MAX, argv[1]);
  141.  
  142.     if (stat(buff, &s)) {
  143.         cli_error(CL_ENOENT, buff);
  144.         free(buff);
  145.         return CMD_FAILURE;
  146.     }
  147.  
  148.     if (s.is_file) {
  149.         ls_print(buff, buff);
  150.     } else {
  151.         dirp = opendir(buff);
  152.         if (!dirp) {
  153.             /* May have been deleted between scoping it and opening it */
  154.             cli_error(CL_EFAIL, "Could not stat %s", buff);
  155.             free(buff);
  156.             return CMD_FAILURE;
  157.         }
  158.         ls_scan_dir(buff, dirp);
  159.         closedir(dirp);
  160.     }
  161.  
  162.     free(buff);
  163.  
  164.     return CMD_SUCCESS;
  165. }
  166.  
  167.