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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 <string.h>
  34. #include "entry.h"
  35. #include "help.h"
  36. #include "cmds.h"
  37. #include "modules.h"
  38. #include "builtins.h"
  39. #include "errors.h"
  40.  
  41. static char *cmdname = "help";
  42. extern const char *progname;
  43. extern unsigned int cli_interactive;
  44.  
  45. #define HELP_IS_MODULE   1
  46. #define HELP_IS_BUILTIN  0
  47. #define HELP_IS_RUBBISH  -1
  48.  
  49. volatile int mod_switch = -1;
  50.  
  51. /* Just use a pointer here, no need for mod_switch */
  52. int is_mod_or_builtin(char *cmd)
  53. {
  54.     int rc = HELP_IS_RUBBISH;
  55.  
  56.     rc = is_builtin(cmd);
  57.     if (rc > -1) {
  58.         mod_switch = rc;
  59.         return HELP_IS_BUILTIN;
  60.     }
  61.     rc = is_module(cmd);
  62.     if (rc > -1) {
  63.         mod_switch = rc;
  64.         return HELP_IS_MODULE;
  65.     }
  66.  
  67.     return HELP_IS_RUBBISH;
  68. }
  69.  
  70. void *help_cmd_help(unsigned int level)
  71. {
  72.     if (level == HELP_SHORT) {
  73.         printf(
  74.         "\n  %s [command] <extended>\n"
  75.         "  Use help [command] extended for detailed help on [command] "
  76.         ", even `help'\n\n", cmdname);
  77.     } else {
  78.         printf(
  79.         "\n  `%s' - shows help for commands\n"
  80.         "  Examples:\n"
  81.         "   %s [command]           Show help for [command]\n"
  82.         "   %s [command] extended  Show extended help for [command]\n"
  83.         "\n  If no argument is given to %s, a list of commands are shown\n\n",
  84.         cmdname, cmdname, cmdname, cmdname);
  85.     }
  86.  
  87.     return CMD_VOID;
  88. }
  89.  
  90. int *cmd_help(char *argv[])
  91. {
  92.     module_t *mod;
  93.     builtin_t *cmd;
  94.     unsigned int i = 0;
  95.     int rc = 0;
  96.     int argc;
  97.     int level = HELP_SHORT;
  98.  
  99.     for (argc = 0; argv[argc] != NULL; argc ++);
  100.  
  101.     if (argc > 3) {
  102.         printf("\nToo many arguments to `%s', try:\n", cmdname);
  103.         help_cmd_help(HELP_SHORT);
  104.         return CMD_FAILURE;
  105.     }
  106.  
  107.     if (argc == 3) {
  108.         if (!strcmp("extended", argv[2]))
  109.             level = HELP_LONG;
  110.         else
  111.             level = HELP_SHORT;
  112.     }
  113.  
  114.     if (argc > 1) {
  115.         rc = is_mod_or_builtin(argv[1]);
  116.         switch (rc) {
  117.         case HELP_IS_RUBBISH:
  118.             printf("Invalid command %s\n", argv[1]);
  119.             return CMD_FAILURE;
  120.         case HELP_IS_MODULE:
  121.             help_module(mod_switch, level);
  122.             return CMD_SUCCESS;
  123.         case HELP_IS_BUILTIN:
  124.             help_builtin(mod_switch, level);
  125.             return CMD_SUCCESS;
  126.         }
  127.     }
  128.  
  129.     printf("%sAvailable commands are:\n", cli_interactive ? "\n  " : "");
  130.     if (cli_interactive)
  131.         printf(
  132.             "  ------------------------------------------------------------\n");
  133.  
  134.     /* First, show a list of built in commands that are available in this mode */
  135.     for (cmd = builtins; cmd->name != NULL; cmd++, i++) {
  136.         if (!builtin_is_restricted(i)) {
  137.             if (is_builtin_alias(cmd->name))
  138.                 printf("   %-16s\tAlias for `%s'\n", cmd->name,
  139.                     alias_for_builtin(cmd->name));
  140.             else
  141.                 printf("   %-16s\t%s\n", cmd->name, cmd->desc);
  142.         }
  143.     }
  144.  
  145.     i = 0;
  146.  
  147.     /* Now, show a list of module commands that are available in this mode */
  148.     for (mod = modules; mod->name != NULL; mod++, i++) {
  149.         if (!module_is_restricted(i)) {
  150.             if (is_module_alias(mod->name))
  151.                 printf("   %-16s\tAlias for `%s'\n", mod->name,
  152.                     alias_for_module(mod->name));
  153.             else
  154.                 printf("   %-16s\t%s\n", mod->name, mod->desc);
  155.         }
  156.     }
  157.  
  158.     /* Provide  a little more information and inform them of history / line
  159.      * editing features if they are present */
  160.     if (cli_interactive)
  161.         printf("\n  Try %s %s for more information on how `%s' works.\n\n",
  162.             cmdname, cmdname, cmdname);
  163.  
  164.     return CMD_SUCCESS;
  165. }
  166.