104 lines
3.3 KiB
C
104 lines
3.3 KiB
C
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/**
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* @file if.c
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* @author Ambroz Bizjak <ambrop7@gmail.com>
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*
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* @section LICENSE
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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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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the author nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this 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" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @section DESCRIPTION
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*
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* Conditional module.
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*
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* Synopsis: if(string cond)
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* Description: on initialization, transitions to UP state if cond equals "true", else
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* remains in the DOWN state indefinitely.
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*
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* Synopsis: ifnot(string cond)
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* Description: on initialization, transitions to UP state if cond does not equal "true", else
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* remains in the DOWN state indefinitely.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <ncd/NCDModule.h>
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#include <ncd/extra/value_utils.h>
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#include <generated/blog_channel_ncd_if.h>
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#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
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static void new_templ (NCDModuleInst *i, const struct NCDModuleInst_new_params *params, int is_not)
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{
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// check arguments
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NCDValRef arg;
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if (!NCDVal_ListRead(params->args, 1, &arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong arity");
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goto fail0;
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}
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if (!NCDVal_IsString(arg)) {
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ModuleLog(i, BLOG_ERROR, "wrong type");
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goto fail0;
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}
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// compute logical value of argument
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int c = ncd_read_boolean(arg);
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// signal up if needed
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if ((is_not && !c) || (!is_not && c)) {
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NCDModuleInst_Backend_Up(i);
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}
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return;
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fail0:
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NCDModuleInst_Backend_DeadError(i);
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}
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static void func_new (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_templ(i, params, 0);
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}
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static void func_new_not (void *unused, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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new_templ(i, params, 1);
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}
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static struct NCDModule modules[] = {
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{
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.type = "if",
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.func_new2 = func_new
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}, {
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.type = "ifnot",
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.func_new2 = func_new_not
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}, {
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.type = NULL
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}
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};
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const struct NCDModuleGroup ncdmodule_if = {
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.modules = modules
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};
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