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| 3265 | post | 1 | /* Copyright (c) 2008, Tim Post <tinkertim@gmail.com> |
| 2 | * All rights reserved. |
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| 3 | * |
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| 4 | * Redistribution and use in source and binary forms, with or without |
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| 5 | * modification, are permitted provided that the following conditions are met: |
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| 6 | * |
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| 7 | * Redistributions of source code must retain the above copyright notice, this |
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| 8 | * list of conditions and the following disclaimer. |
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| 9 | * |
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| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
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| 11 | * this list of conditions and the following disclaimer in the documentation |
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| 12 | * and/or other materials provided with the distribution. |
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| 13 | * |
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| 14 | * Neither the name of the original program's authors nor the names of its |
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| 15 | * contributors may be used to endorse or promote products derived from this |
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| 16 | * software without specific prior written permission. |
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| 17 | * |
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| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 28 | * POSSIBILITY OF SUCH DAMAGE. |
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| 29 | */ |
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| 30 | |||
| 31 | /* NOTES: |
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| 32 | * module_* functions are pretty much identical to builtin_* functions at this |
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| 33 | * point. On the surface, it would appear that making each function dual purpose |
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| 34 | * would be economical. |
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| 35 | * |
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| 36 | * These are kept separate because the structures (module_t and builtin_t) may |
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| 37 | * grow apart and become rather different, even though they're identical at this |
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| 38 | * point. |
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| 39 | * |
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| 40 | * To keep things easy to hack, everything is separated. In reality this only adds |
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| 41 | * 6 - 8 extra functions, but keeps each function very easy to read and modify. */ |
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| 42 | |||
| 43 | /* TODO: |
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| 44 | * Many of these could be unsigned, provided the modules and builtins themselves |
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| 45 | * can follow suit. Long term goal. */ |
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| 46 | |||
| 47 | #include <stdio.h> |
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| 48 | #include <stdlib.h> |
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| 49 | #include <string.h> |
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| 50 | #include "errors.h" |
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| 51 | #include "cmds.h" |
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| 52 | #include "module_aliases.h" |
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| 53 | |||
| 54 | extern volatile unsigned int cli_interactive; |
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| 55 | |||
| 56 | int module_is_restricted(int pos) |
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| 57 | { |
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| 58 | /* Restriction Levels: |
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| 59 | * -1 -> Available only in interactive mode |
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| 60 | * 0 -> Available in any mode |
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| 61 | * 1 -> Available only in non-interactive mode */ |
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| 62 | |||
| 63 | module_t *mod = modules; |
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| 64 | mod += pos; |
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| 65 | /* We're interactive, and the module is OK to run */ |
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| 66 | if (cli_interactive && mod->restricted <= 0) |
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| 67 | return 0; |
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| 68 | /* We're not interactive, and the module is OK to run */ |
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| 69 | if (!cli_interactive && mod->restricted >= 0) |
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| 70 | return 0; |
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| 71 | |||
| 72 | /* Anything else is just a big fat no :) */ |
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| 73 | return 1; |
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| 74 | } |
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| 75 | |||
| 76 | /* Checks if an entry function matching command exists in modules[], if so |
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| 77 | * its position in the array is returned */ |
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| 78 | int is_module(const char *command) |
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| 79 | { |
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| 80 | module_t *mod; |
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| 81 | unsigned int i = 0; |
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| 82 | |||
| 83 | if (NULL == command) |
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| 84 | return -2; |
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| 85 | |||
| 86 | for (mod = modules; mod->name != NULL; mod++, i++) { |
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| 87 | if (!strcmp(mod->name, command)) |
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| 88 | return i; |
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| 89 | } |
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| 90 | |||
| 91 | return -1; |
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| 92 | } |
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| 93 | |||
| 94 | /* Checks if a module is an alias (sharing an entry point with another |
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| 95 | * module). Returns 1 if so */ |
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| 96 | int is_module_alias(const char *command) |
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| 97 | { |
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| 98 | unsigned int i = 0; |
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| 99 | |||
| 100 | if (NULL == command) |
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| 101 | return -1; |
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| 102 | |||
| 103 | for(i=0; mod_aliases[i] != NULL; i+=2) { |
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| 104 | if (!strcmp(mod_aliases[i], command)) |
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| 105 | return 1; |
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| 106 | } |
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| 107 | |||
| 108 | return 0; |
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| 109 | } |
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| 110 | |||
| 111 | /* Returns the name of the module that an alias points to */ |
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| 112 | char *alias_for_module(const char *command) |
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| 113 | { |
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| 114 | unsigned int i = 0; |
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| 115 | |||
| 116 | if (NULL == command) |
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| 117 | return (char *)NULL; |
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| 118 | |||
| 119 | for(i=0; mod_aliases[i] != NULL; i++) { |
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| 120 | if (!strcmp(mod_aliases[i], command)) |
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| 121 | return (char *)mod_aliases[++i]; |
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| 122 | i++; |
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| 123 | } |
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| 124 | |||
| 125 | return (char *)NULL; |
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| 126 | } |
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| 127 | |||
| 128 | |||
| 129 | /* Invokes the 'help' entry function for the module at position (int) module, |
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| 130 | * which wants an unsigned int to determine brief or extended display. */ |
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| 131 | int help_module(int module, unsigned int extended) |
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| 132 | { |
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| 133 | module_t *mod = modules; |
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| 134 | |||
| 135 | mod += module; |
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| 136 | |||
| 137 | if (NULL != mod->help) { |
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| 138 | mod->help(extended); |
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| 139 | return CL_EOK; |
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| 140 | } else |
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| 141 | return CL_ENOENT; |
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| 142 | } |
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| 143 | |||
| 144 | /* Invokes the module entry point modules[module], passing argv[] as an argument |
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| 145 | * stack. */ |
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| 146 | int run_module(int module, char *argv[]) |
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| 147 | { |
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| 148 | module_t *mod = modules; |
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| 149 | |||
| 150 | mod += module; |
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| 151 | |||
| 152 | if (NULL != mod->entry) |
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| 153 | return ((int)mod->entry(argv)); |
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| 154 | |||
| 155 | return CL_ENOENT; |
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| 156 | } |