135 lines
3.8 KiB
C
135 lines
3.8 KiB
C
/**
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* @file alias.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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* Synopsis:
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* alias(string target)
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*
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* Variables and objects:
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* - empty name - resolves target
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* - nonempty name N - resolves target.N
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <limits.h>
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#include <misc/debug.h>
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#include <misc/balloc.h>
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#include <ncd/extra/NCDFastNames.h>
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#include <ncd/module_common.h>
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#include <generated/blog_channel_ncd_alias.h>
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struct instance {
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NCDModuleInst *i;
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NCDFastNames names;
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};
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static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
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{
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struct instance *o = vo;
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o->i = i;
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// read arguments
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NCDValRef target_arg;
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if (!NCDVal_ListRead(params->args, 1, &target_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(target_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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// parse name string
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if (!NCDFastNames_Init(&o->names, i->params->iparams->string_index, NCDVal_StringMemRef(target_arg))) {
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ModuleLog(i, BLOG_ERROR, "NCDFastNames_Init failed");
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goto fail0;
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}
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// signal up
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NCDModuleInst_Backend_Up(o->i);
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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_die (void *vo)
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{
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struct instance *o = vo;
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NCDFastNames_Free(&o->names);
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NCDModuleInst_Backend_Dead(o->i);
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}
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static int func_getobj (void *vo, NCD_string_id_t name, NCDObject *out_object)
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{
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struct instance *o = vo;
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NCD_string_id_t *names = NCDFastNames_GetNames(&o->names);
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NCDObject object;
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if (!NCDModuleInst_Backend_GetObj(o->i, names[0], &object)) {
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return 0;
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}
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NCDObject obj2;
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if (!NCDObject_ResolveObjExprCompact(&object, names + 1, NCDFastNames_GetNumNames(&o->names) - 1, &obj2)) {
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return 0;
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}
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if (name == NCD_STRING_EMPTY) {
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*out_object = obj2;
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return 1;
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}
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return NCDObject_GetObj(&obj2, name, out_object);
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}
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static struct NCDModule modules[] = {
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{
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.type = "alias",
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.func_new2 = func_new,
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.func_die = func_die,
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.func_getobj = func_getobj,
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.alloc_size = sizeof(struct instance)
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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_alias = {
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.modules = modules
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};
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