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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 unsigned int ls_scope(const char *path)
  54. {
  55.     int fd;
  56.     DIR *dirp;
  57.  
  58.     dirp = opendir(path);
  59.     if (dirp) {
  60.         closedir(dirp);
  61.         return LS_DIR;
  62.     }
  63.  
  64.     fd = open(path, O_RDONLY);
  65.     if (fd > 0) {
  66.         close(fd);
  67.         return LS_FILE;
  68.     }
  69.  
  70.     return LS_BOGUS;
  71. }
  72.  
  73. static void ls_scan_dir(const char *d, DIR *dirp)
  74. {
  75.     struct dirent *dp;
  76.     unsigned int scope;
  77.     char *buff;
  78.  
  79.     if (! dirp)
  80.         return;
  81.  
  82.     buff = (char *)malloc(PATH_MAX);
  83.     if (NULL == buff) {
  84.         cli_error(CL_ENOMEM, "ls: failed to scan %s", d);
  85.         return;
  86.     }
  87.  
  88.     while ((dp = readdir(dirp))) {
  89.         memset(buff, 0, sizeof(buff));
  90.         /* Don't worry if inserting a double slash, this will be fixed by
  91.          * absolutize() later with subsequent calls to open() or readdir() */
  92.         snprintf(buff, PATH_MAX - 1, "%s/%s", d, dp->d_name);
  93.         scope = ls_scope(buff);
  94.         switch (scope) {
  95.         case LS_DIR:
  96.             ls_print_dir(dp->d_name);
  97.             break;
  98.         case LS_FILE:
  99.             ls_print_file(dp->d_name);
  100.             break;
  101.         case LS_BOGUS:
  102.             /* Odd chance it was deleted from the time readdir() found
  103.              * it and the time that it was scoped */
  104.             printf("ls: skipping bogus node %s\n", dp->d_name);
  105.             break;
  106.         }
  107.     }
  108.  
  109.     free(buff);
  110.  
  111.     return;
  112. }
  113.  
  114. /* ls_print_* currently does nothing more than print the entry.
  115.  * in the future, we will likely pass the absolute path, and
  116.  * some sort of ls_options structure that controls how each
  117.  * entry is printed and what is printed about it.
  118.  *
  119.  * Now we just print basic DOS style lists */
  120.  
  121. static void ls_print_dir(const char *d)
  122. {
  123.     printf("%-40s\t<DIR>\n", d);
  124.  
  125.     return;
  126. }
  127.  
  128. static void ls_print_file(const char *f)
  129. {
  130.     printf("%-40s\n", f);
  131.  
  132.     return;
  133. }
  134.  
  135. void * help_cmd_ls(unsigned int level)
  136. {
  137.     if (level == HELP_SHORT) {
  138.         printf("`%s' lists files and directories.\n", cmdname);
  139.     } else {
  140.         help_cmd_ls(HELP_SHORT);
  141.         printf("  `%s' [path], if no path is given the current "
  142.                 "working directory is used.\n", cmdname);
  143.     }
  144.  
  145.     return CMD_VOID;
  146. }
  147.  
  148. int * cmd_ls(char **argv)
  149. {
  150.     unsigned int argc;
  151.     unsigned int scope;
  152.     char *buff;
  153.     DIR *dirp;
  154.  
  155.     /* Count the arguments */
  156.     for (argc = 0; argv[argc] != NULL; argc ++);
  157.  
  158.     buff = (char *) malloc(PATH_MAX);
  159.     if (NULL == buff) {
  160.         cli_error(CL_ENOMEM, "%s: ", cmdname);
  161.         return CMD_FAILURE;
  162.     }
  163.     memset(buff, 0, sizeof(buff));
  164.  
  165.     if (argc == 1)
  166.         getcwd(buff, PATH_MAX);
  167.     else
  168.         strncpy(buff, argv[1], PATH_MAX);
  169.  
  170.     scope = ls_scope(buff);
  171.  
  172.     switch (scope) {
  173.     case LS_BOGUS:
  174.         cli_error(CL_ENOENT, buff);
  175.         free(buff);
  176.         return CMD_FAILURE;
  177.     case LS_FILE:
  178.         ls_print_file(buff);
  179.         break;
  180.     case LS_DIR:
  181.         dirp = opendir(buff);
  182.         if (! dirp) {
  183.             /* May have been deleted between scoping it and opening it */
  184.             cli_error(CL_EFAIL, "Could not stat %s", buff);
  185.             free(buff);
  186.             return CMD_FAILURE;
  187.         }
  188.         ls_scan_dir(buff, dirp);
  189.         closedir(dirp);
  190.         break;
  191.     }
  192.  
  193.     free(buff);
  194.  
  195.     return CMD_SUCCESS;
  196. }
  197.  
  198.