Subversion Repositories HelenOS

Rev

Rev 4341 | Blame | Compare with Previous | Last modification | View Log | Download | RSS feed

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