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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.     if (ls_scope(f) == LS_FILE)
  76.         printf("%-40s\n", f);
  77.     else
  78.         printf("%-40s <DIR>\n", f);
  79.     return;
  80. }
  81.  
  82. /* Dispays help for ls in various levels */
  83. void * help_cmd_ls(unsigned int level)
  84. {
  85.     if (level == HELP_SHORT) {
  86.         printf("`%s' lists files and directories.\n", cmdname);
  87.     } else {
  88.         help_cmd_ls(HELP_SHORT);
  89.         printf("  `%s' [path], if no path is given the current "
  90.                 "working directory is used.\n", cmdname);
  91.     }
  92.  
  93.     return CMD_VOID;
  94. }
  95.  
  96. int * cmd_ls(char **argv)
  97. {
  98.     unsigned int argc;
  99.     unsigned int scope;
  100.     char *buff;
  101.  
  102.     DIR *dirp;
  103.     struct dirent *dp;
  104.  
  105.     /* Count the arguments */
  106.     for (argc = 0; argv[argc] != NULL; argc ++);
  107.  
  108.     if (argc > 2) {
  109.         printf("%s - Too many arguments. Try `help %s extended'\n",
  110.             cmdname, cmdname);
  111.         return CMD_FAILURE;
  112.     }
  113.  
  114.     buff = (char *) malloc(PATH_MAX);
  115.     if (NULL == buff) {
  116.         cli_error(CL_ENOMEM, "%s: ", cmdname);
  117.         return CMD_FAILURE;
  118.     }
  119.     memset(buff, 0, sizeof(buff));
  120.  
  121.     if (argc == 1)
  122.         getcwd(buff, PATH_MAX);
  123.     else
  124.         strncpy(buff, argv[1], PATH_MAX);
  125.  
  126.     scope = ls_scope(buff);
  127.  
  128.     switch (scope) {
  129.     case LS_BOGUS:
  130.         cli_error(CL_ENOENT, buff);
  131.         free(buff);
  132.         return CMD_FAILURE;
  133.     case LS_FILE:
  134.         ls_print(buff);
  135.         break;
  136.     case LS_DIR:
  137.         dirp = opendir(buff);
  138.         while ((dp = readdir(dirp)))
  139.             ls_print(dp->d_name);
  140.         closedir(dirp);
  141.         break;
  142.     }
  143.  
  144.     free(buff);
  145.  
  146.     return CMD_SUCCESS;
  147.    
  148. }
  149.  
  150.