tor-android/external/badvpn_dns/ncd/modules/logical.c

161 lines
4.9 KiB
C

/**
* @file logical.c
* @author Ambroz Bizjak <ambrop7@gmail.com>
*
* @section LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @section DESCRIPTION
*
* Module for logical operators.
*
* Synopsis: not(string val)
* Variables:
* string (empty) - "true" if val does not equal "true", "false" otherwise
*
* Synopsis: or([string val1, ...])
* Variables:
* string (empty) - "true" if at least one of the values equals "true", "false" otherwise
*
* Synopsis: and([string val1, ...])
* Variables:
* string (empty) - "true" if all of the values equal "true", "false" otherwise
*/
#include <stdlib.h>
#include <string.h>
#include <ncd/NCDModule.h>
#include <ncd/static_strings.h>
#include <ncd/extra/value_utils.h>
#include <generated/blog_channel_ncd_logical.h>
#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
struct instance {
NCDModuleInst *i;
int value;
};
static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params, int is_not, int is_or)
{
struct instance *o = vo;
o->i = i;
// compute value from arguments
if (is_not) {
NCDValRef arg;
if (!NCDVal_ListRead(params->args, 1, &arg)) {
ModuleLog(o->i, BLOG_ERROR, "wrong arity");
goto fail0;
}
if (!NCDVal_IsString(arg)) {
ModuleLog(o->i, BLOG_ERROR, "wrong type");
goto fail0;
}
o->value = !ncd_read_boolean(arg);
} else {
o->value = (is_or ? 0 : 1);
size_t count = NCDVal_ListCount(params->args);
for (size_t j = 0; j < count; j++) {
NCDValRef arg = NCDVal_ListGet(params->args, j);
if (!NCDVal_IsString(arg)) {
ModuleLog(o->i, BLOG_ERROR, "wrong type");
goto fail0;
}
int this_value = ncd_read_boolean(arg);
if (is_or) {
o->value = o->value || this_value;
} else {
o->value = o->value && this_value;
}
}
}
// signal up
NCDModuleInst_Backend_Up(o->i);
return;
fail0:
NCDModuleInst_Backend_DeadError(i);
}
static void func_new_not (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
func_new(vo, i, params, 1, 0);
}
static void func_new_or (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
func_new(vo, i, params, 0, 1);
}
static void func_new_and (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
func_new(vo, i, params, 0, 0);
}
static int func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
{
struct instance *o = vo;
if (name == NCD_STRING_EMPTY) {
*out = ncd_make_boolean(mem, o->value, o->i->params->iparams->string_index);
return 1;
}
return 0;
}
static struct NCDModule modules[] = {
{
.type = "not",
.func_new2 = func_new_not,
.func_getvar2 = func_getvar2,
.alloc_size = sizeof(struct instance)
}, {
.type = "or",
.func_new2 = func_new_or,
.func_getvar2 = func_getvar2,
.alloc_size = sizeof(struct instance)
}, {
.type = "and",
.func_new2 = func_new_and,
.func_getvar2 = func_getvar2,
.alloc_size = sizeof(struct instance)
}, {
.type = NULL
}
};
const struct NCDModuleGroup ncdmodule_logical = {
.modules = modules
};