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

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2015-01-25 11:08:34 +00:00
/**
* @file concat.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
*
* Synopsis:
* concat([string elem ...])
* concatv(list strings)
*
* Description:
* Concatenates zero or more strings. The result is available as the empty
* string variable. For concatv(), the strings are provided as a single
* list argument. For concat(), the strings are provided as arguments
* themselves.
*/
#include <stddef.h>
#include <string.h>
#include <misc/balloc.h>
#include <misc/offset.h>
#include <misc/BRefTarget.h>
#include <ncd/NCDModule.h>
#include <ncd/static_strings.h>
#include <generated/blog_channel_ncd_concat.h>
#define ModuleLog(i, ...) NCDModuleInst_Backend_Log((i), BLOG_CURRENT_CHANNEL, __VA_ARGS__)
struct result {
BRefTarget ref_target;
size_t length;
char data[];
};
struct instance {
NCDModuleInst *i;
struct result *result;
};
static void result_ref_target_func_release (BRefTarget *ref_target)
{
struct result *result = UPPER_OBJECT(ref_target, struct result, ref_target);
BFree(result);
}
static void new_concat_common (void *vo, NCDModuleInst *i, NCDValRef list)
{
ASSERT(NCDVal_IsList(list))
struct instance *o = vo;
o->i = i;
size_t count = NCDVal_ListCount(list);
bsize_t result_size = bsize_fromsize(sizeof(struct result));
// check arguments and compute result size
for (size_t j = 0; j < count; j++) {
NCDValRef arg = NCDVal_ListGet(list, j);
if (!NCDVal_IsString(arg)) {
ModuleLog(i, BLOG_ERROR, "wrong type");
goto fail0;
}
result_size = bsize_add(result_size, bsize_fromsize(NCDVal_StringLength(arg)));
}
// allocate result
o->result = BAllocSize(result_size);
if (!o->result) {
ModuleLog(i, BLOG_ERROR, "BAllocSize failed");
goto fail0;
}
// init ref target
BRefTarget_Init(&o->result->ref_target, result_ref_target_func_release);
// copy data to result
o->result->length = 0;
for (size_t j = 0; j < count; j++) {
NCDValRef arg = NCDVal_ListGet(list, j);
b_cstring cstr = NCDVal_StringCstring(arg);
b_cstring_copy_to_buf(cstr, 0, cstr.length, o->result->data + o->result->length);
o->result->length += cstr.length;
}
// signal up
NCDModuleInst_Backend_Up(o->i);
return;
fail0:
NCDModuleInst_Backend_DeadError(i);
}
static void func_new_concat (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
new_concat_common(vo, i, params->args);
}
static void func_new_concatv (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
{
NCDValRef list_arg;
if (!NCDVal_ListRead(params->args, 1, &list_arg)) {
ModuleLog(i, BLOG_ERROR, "wrong arity");
goto fail0;
}
if (!NCDVal_IsList(list_arg)) {
ModuleLog(i, BLOG_ERROR, "wrong type");
goto fail0;
}
new_concat_common(vo, i, list_arg);
return;
fail0:
NCDModuleInst_Backend_DeadError(i);
}
static void func_die (void *vo)
{
struct instance *o = vo;
// release result reference
BRefTarget_Deref(&o->result->ref_target);
NCDModuleInst_Backend_Dead(o->i);
}
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 = NCDVal_NewExternalString(mem, o->result->data, o->result->length, &o->result->ref_target);
return 1;
}
return 0;
}
static struct NCDModule modules[] = {
{
.type = "concat",
.func_new2 = func_new_concat,
.func_die = func_die,
.func_getvar2 = func_getvar2,
.alloc_size = sizeof(struct instance),
.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
}, {
.type = "concatv",
.func_new2 = func_new_concatv,
.func_die = func_die,
.func_getvar2 = func_getvar2,
.alloc_size = sizeof(struct instance),
.flags = NCDMODULE_FLAG_ACCEPT_NON_CONTINUOUS_STRINGS
}, {
.type = NULL
}
};
const struct NCDModuleGroup ncdmodule_concat = {
.modules = modules
};