Subversion Repositories HelenOS

Rev

Rev 3265 | Rev 3403 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
3265 post 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
int module_is_restricted(int pos)
57
{
58
    /* Restriction Levels:
59
     * -1 -> Available only in interactive mode
60
     *  0 -> Available in any mode
61
     *  1 -> Available only in non-interactive mode */
62
 
63
    module_t *mod = modules;
64
    mod += pos;
65
    /* We're interactive, and the module is OK to run */
66
    if (cli_interactive && mod->restricted <= 0)
67
        return 0;
68
    /* We're not interactive, and the module is OK to run */
69
    if (!cli_interactive && mod->restricted >= 0)
70
        return 0;
71
 
72
    /* Anything else is just a big fat no :) */
73
    return 1;
74
}
75
 
76
/* Checks if an entry function matching command exists in modules[], if so
77
 * its position in the array is returned */
78
int is_module(const char *command)
79
{
80
    module_t *mod;
81
    unsigned int i = 0;
82
 
83
    if (NULL == command)
84
        return -2;
85
 
86
    for (mod = modules; mod->name != NULL; mod++, i++) {
87
        if (!strcmp(mod->name, command))
88
            return i;
89
    }
90
 
91
    return -1;
92
}
93
 
94
/* Checks if a module is an alias (sharing an entry point with another
95
 * module). Returns 1 if so */
96
int is_module_alias(const char *command)
97
{
98
    unsigned int i = 0;
99
 
100
    if (NULL == command)
101
        return -1;
102
 
103
    for(i=0; mod_aliases[i] != NULL; i+=2) {
104
        if (!strcmp(mod_aliases[i], command))
105
            return 1;
106
    }
107
 
108
    return 0;
109
}
110
 
111
/* Returns the name of the module that an alias points to */
112
char *alias_for_module(const char *command)
113
{
114
    unsigned int i = 0;
115
 
116
    if (NULL == command)
117
        return (char *)NULL;
118
 
119
    for(i=0; mod_aliases[i] != NULL; i++) {
120
        if (!strcmp(mod_aliases[i], command))
121
            return (char *)mod_aliases[++i];
122
        i++;
123
    }
124
 
125
    return (char *)NULL;
126
}
127
 
128
 
129
/* Invokes the 'help' entry function for the module at position (int) module,
130
 * which wants an unsigned int to determine brief or extended display. */
131
int help_module(int module, unsigned int extended)
132
{
133
    module_t *mod = modules;
134
 
135
    mod += module;
136
 
137
    if (NULL != mod->help) {
138
        mod->help(extended);
139
        return CL_EOK;
140
    } else
141
        return CL_ENOENT;
142
}
143
 
144
/* Invokes the module entry point modules[module], passing argv[] as an argument
145
 * stack. */
146
int run_module(int module, char *argv[])
147
{
148
    module_t *mod = modules;
149
 
150
    mod += module;
151
 
152
    if (NULL != mod->entry)
153
        return ((int)mod->entry(argv));
154
 
155
    return CL_ENOENT;
156
}