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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 inline uint64_t flen(const char *f)
  54. {
  55.     int fd;
  56.     uint64_t size;
  57.  
  58.     fd = open(f, O_RDONLY);
  59.     if (fd == -1)
  60.         return 0;
  61.  
  62.     size = lseek(fd, 0, SEEK_END);
  63.     close(fd);
  64.  
  65.     if (size < 0)
  66.         size = 0;
  67.  
  68.     return size;
  69. }
  70.  
  71. static unsigned int ls_scope(const char *path)
  72. {
  73.     int fd;
  74.     DIR *dirp;
  75.  
  76.     dirp = opendir(path);
  77.     if (dirp) {
  78.         closedir(dirp);
  79.         return LS_DIR;
  80.     }
  81.  
  82.     fd = open(path, O_RDONLY);
  83.     if (fd > 0) {
  84.         close(fd);
  85.         return LS_FILE;
  86.     }
  87.  
  88.     return LS_BOGUS;
  89. }
  90.  
  91. static void ls_scan_dir(const char *d, DIR *dirp)
  92. {
  93.     struct dirent *dp;
  94.     unsigned int scope;
  95.     char *buff;
  96.  
  97.     if (! dirp)
  98.         return;
  99.  
  100.     buff = (char *)malloc(PATH_MAX);
  101.     if (NULL == buff) {
  102.         cli_error(CL_ENOMEM, "ls: failed to scan %s", d);
  103.         return;
  104.     }
  105.  
  106.     while ((dp = readdir(dirp))) {
  107.         memset(buff, 0, sizeof(buff));
  108.         /* Don't worry if inserting a double slash, this will be fixed by
  109.          * absolutize() later with subsequent calls to open() or readdir() */
  110.         snprintf(buff, PATH_MAX - 1, "%s/%s", d, dp->d_name);
  111.         scope = ls_scope(buff);
  112.         switch (scope) {
  113.         case LS_DIR:
  114.             ls_print_dir(dp->d_name);
  115.             break;
  116.         case LS_FILE:
  117.             ls_print_file(dp->d_name);
  118.             break;
  119.         case LS_BOGUS:
  120.             /* Odd chance it was deleted from the time readdir() found
  121.              * it and the time that it was scoped */
  122.             printf("ls: skipping bogus node %s\n", dp->d_name);
  123.             break;
  124.         }
  125.     }
  126.  
  127.     free(buff);
  128.  
  129.     return;
  130. }
  131.  
  132. /* ls_print_* currently does nothing more than print the entry.
  133.  * in the future, we will likely pass the absolute path, and
  134.  * some sort of ls_options structure that controls how each
  135.  * entry is printed and what is printed about it.
  136.  *
  137.  * Now we just print basic DOS style lists */
  138.  
  139. static void ls_print_dir(const char *d)
  140. {
  141.     printf("%-40s\t<dir>\n", d);
  142.  
  143.     return;
  144. }
  145.  
  146. static void ls_print_file(const char *f)
  147. {
  148.     printf("%-40s\t%u\n", f, flen(f));
  149.  
  150.     return;
  151. }
  152.  
  153. void help_cmd_ls(unsigned int level)
  154. {
  155.     if (level == HELP_SHORT) {
  156.         printf("`%s' lists files and directories.\n", cmdname);
  157.     } else {
  158.         help_cmd_ls(HELP_SHORT);
  159.         printf("  `%s' [path], if no path is given the current "
  160.                 "working directory is used.\n", cmdname);
  161.     }
  162.  
  163.     return;
  164. }
  165.  
  166. int cmd_ls(char **argv)
  167. {
  168.     unsigned int argc;
  169.     unsigned int scope;
  170.     char *buff;
  171.     DIR *dirp;
  172.  
  173.     argc = cli_count_args(argv);
  174.  
  175.     buff = (char *) malloc(PATH_MAX);
  176.     if (NULL == buff) {
  177.         cli_error(CL_ENOMEM, "%s: ", cmdname);
  178.         return CMD_FAILURE;
  179.     }
  180.     memset(buff, 0, sizeof(buff));
  181.  
  182.     if (argc == 1)
  183.         getcwd(buff, PATH_MAX);
  184.     else
  185.         strncpy(buff, argv[1], PATH_MAX);
  186.  
  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:
  195.         ls_print_file(buff);
  196.         break;
  197.     case LS_DIR:
  198.         dirp = opendir(buff);
  199.         if (! dirp) {
  200.             /* May have been deleted between scoping it and opening it */
  201.             cli_error(CL_EFAIL, "Could not stat %s", buff);
  202.             free(buff);
  203.             return CMD_FAILURE;
  204.         }
  205.         ls_scan_dir(buff, dirp);
  206.         closedir(dirp);
  207.         break;
  208.     }
  209.  
  210.     free(buff);
  211.  
  212.     return CMD_SUCCESS;
  213. }
  214.  
  215.