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1 office 1 /**
2 * @file if.c
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * @section DESCRIPTION
30 *
31 * Conditional module.
32 *
33 * Synopsis: if(string cond)
34 * Description: on initialization, transitions to UP state if cond equals "true", else
35 * remains in the DOWN state indefinitely.
36 *
37 * Synopsis: ifnot(string cond)
38 * Description: on initialization, transitions to UP state if cond does not equal "true", else
39 * remains in the DOWN state indefinitely.
40 */
41  
42 #include <stdlib.h>
43 #include <string.h>
44  
45 #include <ncd/module_common.h>
46  
47 #include <generated/blog_channel_ncd_if.h>
48  
49 static void new_templ (NCDModuleInst *i, const struct NCDModuleInst_new_params *params, int is_not)
50 {
51 // check arguments
52 NCDValRef arg;
53 if (!NCDVal_ListRead(params->args, 1, &arg)) {
54 ModuleLog(i, BLOG_ERROR, "wrong arity");
55 goto fail0;
56 }
57 int arg_val;
58 if (!ncd_read_boolean(arg, &arg_val)) {
59 ModuleLog(i, BLOG_ERROR, "bad argument");
60 goto fail0;
61 }
62  
63 // compute logical value of argument
64 int c = arg_val;
65  
66 // signal up if needed
67 if ((is_not && !c) || (!is_not && c)) {
68 NCDModuleInst_Backend_Up(i);
69 }
70  
71 return;
72  
73 fail0:
74 NCDModuleInst_Backend_DeadError(i);
75 }
76  
77 static void func_new (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
78 {
79 new_templ(i, params, 0);
80 }
81  
82 static void func_new_not (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
83 {
84 new_templ(i, params, 1);
85 }
86  
87 static struct NCDModule modules[] = {
88 {
89 .type = "if",
90 .func_new2 = func_new
91 }, {
92 .type = "ifnot",
93 .func_new2 = func_new_not
94 }, {
95 .type = NULL
96 }
97 };
98  
99 const struct NCDModuleGroup ncdmodule_if = {
100 .modules = modules
101 };