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/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * Redistributions of source code must retain the above copyright notice, this
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 * list of conditions and the following disclaimer.
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 *
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 * Redistributions in binary form must reproduce the above copyright notice,
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 * this list of conditions and the following disclaimer in the documentation
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 * and/or other materials provided with the distribution.
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 *
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 * Neither the name of the original program's authors nor the names of its
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 * contributors may be used to endorse or promote products derived from this
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 * software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 * POSSIBILITY OF SUCH DAMAGE.
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 */
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/* NOTES:
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 * module_* functions are pretty much identical to builtin_* functions at this
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 * point. On the surface, it would appear that making each function dual purpose
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 * would be economical.
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 *
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 * These are kept separate because the structures (module_t and builtin_t) may
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 * grow apart and become rather different, even though they're identical at this
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 * point.
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 *
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 * To keep things easy to hack, everything is separated. In reality this only adds
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 * 6 - 8 extra functions, but keeps each function very easy to read and modify. */
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/* TODO:
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 * Many of these could be unsigned, provided the modules and builtins themselves
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 * can follow suit. Long term goal. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "errors.h"
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#include "cmds.h"
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#include "module_aliases.h"
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extern volatile unsigned int cli_interactive;
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int module_is_restricted(int pos)
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{
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    /* Restriction Levels:
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     * -1 -> Available only in interactive mode
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     *  0 -> Available in any mode
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     *  1 -> Available only in non-interactive mode */
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    module_t *mod = modules;
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    mod += pos;
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    /* We're interactive, and the module is OK to run */
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    if (cli_interactive && mod->restricted <= 0)
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        return 0;
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    /* We're not interactive, and the module is OK to run */
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    if (!cli_interactive && mod->restricted >= 0)
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        return 0;
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    /* Anything else is just a big fat no :) */
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    return 1;
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}
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/* Checks if an entry function matching command exists in modules[], if so
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 * its position in the array is returned */
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int is_module(const char *command)
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{
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    module_t *mod;
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    unsigned int i = 0;
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    if (NULL == command)
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        return -2;
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    for (mod = modules; mod->name != NULL; mod++, i++) {
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        if (!strcmp(mod->name, command))
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            return i;
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    }
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    return -1;
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}
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/* Checks if a module is an alias (sharing an entry point with another
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 * module). Returns 1 if so */
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int is_module_alias(const char *command)
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{
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    unsigned int i = 0;
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    if (NULL == command)
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        return -1;
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    for(i=0; mod_aliases[i] != NULL; i+=2) {
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        if (!strcmp(mod_aliases[i], command))
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            return 1;
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    }
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    return 0;
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}
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/* Returns the name of the module that an alias points to */
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char *alias_for_module(const char *command)
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{
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    unsigned int i = 0;
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    if (NULL == command)
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        return (char *)NULL;
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    for(i=0; mod_aliases[i] != NULL; i++) {
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        if (!strcmp(mod_aliases[i], command))
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            return (char *)mod_aliases[++i];
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        i++;
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    }
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    return (char *)NULL;
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}
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/* Invokes the 'help' entry function for the module at position (int) module,
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 * which wants an unsigned int to determine brief or extended display. */
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int help_module(int module, unsigned int extended)
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{
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    module_t *mod = modules;
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    mod += module;
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    if (NULL != mod->help) {
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        mod->help(extended);
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        return CL_EOK;
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    } else
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        return CL_ENOENT;
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}
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/* Invokes the module entry point modules[module], passing argv[] as an argument
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 * stack. */
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int run_module(int module, char *argv[])
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{
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    module_t *mod = modules;
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    mod += module;
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    if (NULL != mod->entry)
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        return ((int)mod->entry(argv));
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    return CL_ENOENT;
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}