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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. 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. void ls_print(const char *f)
  74. {
  75.     unsigned int scope;
  76.  
  77.     scope = ls_scope(f);
  78.  
  79.     /* If this function is called in a readdir loop, LS_BOGUS
  80.      * can be treated as LS_FILE, since we aren't presenting
  81.      * the full path to open(), just pointer->d_name as obtained
  82.      * from opendir(). This will not happen if ../path/to/file
  83.      * is passed, as may be the argument to ls */
  84.  
  85.     switch (scope) {
  86.     case LS_DIR:
  87.         printf("%-40s <DIR>\n", f);
  88.         break;
  89.     case LS_FILE:
  90.         printf("%-40s\n", f);
  91.         break;
  92.     /* This is never reached unless in a readdir() loop */
  93.     case LS_BOGUS:
  94.         printf("%-40s\n", f);
  95.         break;
  96.     }
  97.     return;
  98. }
  99.  
  100. /* Dispays help for ls in various levels */
  101. void * help_cmd_ls(unsigned int level)
  102. {
  103.     if (level == HELP_SHORT) {
  104.         printf("`%s' lists files and directories.\n", cmdname);
  105.     } else {
  106.         help_cmd_ls(HELP_SHORT);
  107.         printf("  `%s' [path], if no path is given the current "
  108.                 "working directory is used.\n", cmdname);
  109.     }
  110.  
  111.     return CMD_VOID;
  112. }
  113.  
  114. int * cmd_ls(char **argv)
  115. {
  116.     unsigned int argc;
  117.     unsigned int scope;
  118.     char *buff;
  119.  
  120.     DIR *dirp;
  121.     struct dirent *dp;
  122.  
  123.     /* Count the arguments */
  124.     for (argc = 0; argv[argc] != NULL; argc ++);
  125.  
  126.     if (argc > 2) {
  127.         printf("%s - Too many arguments. Try `help %s extended'\n",
  128.             cmdname, cmdname);
  129.         return CMD_FAILURE;
  130.     }
  131.  
  132.     buff = (char *) malloc(PATH_MAX);
  133.     if (NULL == buff) {
  134.         cli_error(CL_ENOMEM, "%s: ", cmdname);
  135.         return CMD_FAILURE;
  136.     }
  137.     memset(buff, 0, sizeof(buff));
  138.  
  139.     if (argc == 1)
  140.         getcwd(buff, PATH_MAX);
  141.     else
  142.         strncpy(buff, argv[1], PATH_MAX);
  143.  
  144.     scope = ls_scope(buff);
  145.  
  146.     switch (scope) {
  147.     case LS_BOGUS:
  148.         cli_error(CL_ENOENT, buff);
  149.         free(buff);
  150.         return CMD_FAILURE;
  151.     case LS_FILE:
  152.         ls_print(buff);
  153.         break;
  154.     case LS_DIR:
  155.         dirp = opendir(buff);
  156.         while ((dp = readdir(dirp)))
  157.             ls_print(dp->d_name);
  158.         closedir(dirp);
  159.         break;
  160.     }
  161.  
  162.     free(buff);
  163.  
  164.     return CMD_SUCCESS;
  165.    
  166. }
  167.  
  168.