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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. #include <stdio.h>
  32. #include <stdlib.h>
  33. #include <unistd.h>
  34. #include <string.h>
  35. #include <errno.h>
  36.  
  37. #include "util.h"
  38. #include "errors.h"
  39. #include "entry.h"
  40. #include "cmds.h"
  41. #include "cd.h"
  42.  
  43. static char * cmdname = "cd";
  44.  
  45. void * help_cmd_cd(unsigned int level)
  46. {
  47.     if (level == HELP_SHORT) {
  48.         printf("`%s' changes the current working directory.\n", cmdname);
  49.     } else {
  50.         printf(
  51.         "  %s <directory>\n"
  52.         "  Change directory to <directory>, e.g `%s /sbin'\n",
  53.             cmdname, cmdname);
  54.     }
  55.  
  56.     return CMD_VOID;
  57. }
  58.  
  59. /* This is a very rudamentary 'cd' command. It is not 'link smart' (yet) */
  60.  
  61. int * cmd_cd(char **argv, cliuser_t *usr)
  62. {
  63.     int argc, rc = 0;
  64.  
  65.     argc = cli_count_args(argv);
  66.  
  67.     /* We don't yet play nice with whitespace, a getopt implementation should
  68.      * protect "quoted\ destination" as a single argument. Its not our job to
  69.      * look for && || or redirection as the tokenizer should have done that
  70.      * (currently, it does not) */
  71.  
  72.     if (argc > 2) {
  73.         cli_error(CL_EFAIL, "Too many arguments to `%s'", cmdname);
  74.         return CMD_FAILURE;
  75.     }
  76.  
  77.     if (argc < 2) {
  78.         printf("%s - no directory specified. Try `help %s extended'\n",
  79.             cmdname, cmdname);
  80.         return CMD_FAILURE;
  81.     }
  82.  
  83.     /* We have the correct # of arguments
  84.      * TODO: handle tidle (~) expansion? */
  85.  
  86.     rc = chdir(argv[1]);
  87.  
  88.     if (rc == 0) {
  89.         cli_set_prompt(usr);
  90.         return CMD_SUCCESS;
  91.     } else {
  92.         switch (rc) {
  93.         case ENOMEM:
  94.             cli_error(CL_EFAIL, "Destination path too long");
  95.             break;
  96.         case ENOENT:
  97.             cli_error(CL_ENOENT, "Invalid directory `%s'", argv[1]);
  98.             break;
  99.         default:
  100.             cli_error(CL_EFAIL, "Unable to change to `%s'", argv[1]);
  101.             break;
  102.         }
  103.     }
  104.  
  105.     return CMD_FAILURE;
  106. }
  107.