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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. /* Checks if an entry function matching command exists in modules[], if so
  57.  * its position in the array is returned */
  58. int is_module(const char *command)
  59. {
  60.     module_t *mod;
  61.     unsigned int i = 0;
  62.  
  63.     if (NULL == command)
  64.         return -2;
  65.  
  66.     for (mod = modules; mod->name != NULL; mod++, i++) {
  67.         if (!str_cmp(mod->name, command))
  68.             return i;
  69.     }
  70.  
  71.     return -1;
  72. }
  73.  
  74. /* Checks if a module is an alias (sharing an entry point with another
  75.  * module). Returns 1 if so */
  76. int is_module_alias(const char *command)
  77. {
  78.     unsigned int i = 0;
  79.  
  80.     if (NULL == command)
  81.         return -1;
  82.  
  83.     for(i=0; mod_aliases[i] != NULL; i+=2) {
  84.         if (!str_cmp(mod_aliases[i], command))
  85.             return 1;
  86.     }
  87.  
  88.     return 0;
  89. }
  90.  
  91. /* Returns the name of the module that an alias points to */
  92. char *alias_for_module(const char *command)
  93. {
  94.     unsigned int i = 0;
  95.  
  96.     if (NULL == command)
  97.         return (char *)NULL;
  98.  
  99.     for(i=0; mod_aliases[i] != NULL; i++) {
  100.         if (!str_cmp(mod_aliases[i], command))
  101.             return (char *)mod_aliases[++i];
  102.         i++;
  103.     }
  104.  
  105.     return (char *)NULL;
  106. }
  107.  
  108.  
  109. /* Invokes the 'help' entry function for the module at position (int) module,
  110.  * which wants an unsigned int to determine brief or extended display. */
  111. int help_module(int module, unsigned int extended)
  112. {
  113.     module_t *mod = modules;
  114.  
  115.     mod += module;
  116.  
  117.     if (NULL != mod->help) {
  118.         mod->help(extended);
  119.         return CL_EOK;
  120.     } else
  121.         return CL_ENOENT;
  122. }
  123.  
  124. /* Invokes the module entry point modules[module], passing argv[] as an argument
  125.  * stack. */
  126. int run_module(int module, char *argv[])
  127. {
  128.     module_t *mod = modules;
  129.  
  130.     mod += module;
  131.  
  132.     if (NULL != mod->entry)
  133.         return ((int)mod->entry(argv));
  134.  
  135.     return CL_ENOENT;
  136. }
  137.