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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. /* NOTES:
  32.  * module_* functions are pretty much identical to builtin_* functions at this
  33.  * point. On the surface, it would appear that making each function dual purpose
  34.  * would be economical.
  35.  *
  36.  * These are kept separate because the structures (module_t and builtin_t) may
  37.  * grow apart and become rather different, even though they're identical at this
  38.  * point.
  39.  *
  40.  * To keep things easy to hack, everything is separated. In reality this only adds
  41.  * 6 - 8 extra functions, but keeps each function very easy to read and modify. */
  42.  
  43. /* TODO:
  44.  * Many of these could be unsigned, provided the modules and builtins themselves
  45.  * can follow suit. Long term goal. */
  46.  
  47. #include <stdio.h>
  48. #include <stdlib.h>
  49. #include <string.h>
  50. #include "errors.h"
  51. #include "cmds.h"
  52. #include "module_aliases.h"
  53.  
  54. extern volatile unsigned int cli_interactive;
  55.  
  56. int module_is_restricted(int pos)
  57. {
  58.     /* Restriction Levels:
  59.      * -1 -> Available only in interactive mode
  60.      *  0 -> Available in any mode
  61.      *  1 -> Available only in non-interactive mode */
  62.  
  63.     module_t *mod = modules;
  64.     mod += pos;
  65.     /* We're interactive, and the module is OK to run */
  66.     if (cli_interactive && mod->restricted <= 0)
  67.         return 0;
  68.     /* We're not interactive, and the module is OK to run */
  69.     if (!cli_interactive && mod->restricted >= 0)
  70.         return 0;
  71.  
  72.     /* Anything else is just a big fat no :) */
  73.     return 1;
  74. }
  75.  
  76. /* Checks if an entry function matching command exists in modules[], if so
  77.  * its position in the array is returned */
  78. int is_module(const char *command)
  79. {
  80.     module_t *mod;
  81.     unsigned int i = 0;
  82.  
  83.     if (NULL == command)
  84.         return -2;
  85.  
  86.     for (mod = modules; mod->name != NULL; mod++, i++) {
  87.         if (!strcmp(mod->name, command))
  88.             return i;
  89.     }
  90.  
  91.     return -1;
  92. }
  93.  
  94. /* Checks if a module is an alias (sharing an entry point with another
  95.  * module). Returns 1 if so */
  96. int is_module_alias(const char *command)
  97. {
  98.     unsigned int i = 0;
  99.  
  100.     if (NULL == command)
  101.         return -1;
  102.  
  103.     for(i=0; mod_aliases[i] != NULL; i+=2) {
  104.         if (!strcmp(mod_aliases[i], command))
  105.             return 1;
  106.     }
  107.  
  108.     return 0;
  109. }
  110.  
  111. /* Returns the name of the module that an alias points to */
  112. char *alias_for_module(const char *command)
  113. {
  114.     unsigned int i = 0;
  115.  
  116.     if (NULL == command)
  117.         return (char *)NULL;
  118.  
  119.     for(i=0; mod_aliases[i] != NULL; i++) {
  120.         if (!strcmp(mod_aliases[i], command))
  121.             return (char *)mod_aliases[++i];
  122.         i++;
  123.     }
  124.  
  125.     return (char *)NULL;
  126. }
  127.  
  128.  
  129. /* Invokes the 'help' entry function for the module at position (int) module,
  130.  * which wants an unsigned int to determine brief or extended display. */
  131. int help_module(int module, unsigned int extended)
  132. {
  133.     module_t *mod = modules;
  134.  
  135.     mod += module;
  136.  
  137.     if (NULL != mod->help) {
  138.         mod->help(extended);
  139.         return CL_EOK;
  140.     } else
  141.         return CL_ENOENT;
  142. }
  143.  
  144. /* Invokes the module entry point modules[module], passing argv[] as an argument
  145.  * stack. */
  146. int run_module(int module, char *argv[])
  147. {
  148.     module_t *mod = modules;
  149.  
  150.     mod += module;
  151.  
  152.     if (NULL != mod->entry)
  153.         return ((int)mod->entry(argv));
  154.  
  155.     return CL_ENOENT;
  156. }
  157.