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1 office 1 /**
2 * @file alias.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 * Synopsis:
32 * alias(string target)
33 *
34 * Variables and objects:
35 * - empty name - resolves target
36 * - nonempty name N - resolves target.N
37 */
38  
39 #include <stdlib.h>
40 #include <string.h>
41 #include <stdint.h>
42 #include <limits.h>
43  
44 #include <misc/debug.h>
45 #include <misc/balloc.h>
46 #include <ncd/extra/NCDFastNames.h>
47  
48 #include <ncd/module_common.h>
49  
50 #include <generated/blog_channel_ncd_alias.h>
51  
52 struct instance {
53 NCDModuleInst *i;
54 NCDFastNames names;
55 };
56  
57 static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
58 {
59 struct instance *o = vo;
60 o->i = i;
61  
62 // read arguments
63 NCDValRef target_arg;
64 if (!NCDVal_ListRead(params->args, 1, &target_arg)) {
65 ModuleLog(i, BLOG_ERROR, "wrong arity");
66 goto fail0;
67 }
68 if (!NCDVal_IsString(target_arg)) {
69 ModuleLog(i, BLOG_ERROR, "wrong type");
70 goto fail0;
71 }
72  
73 // parse name string
74 if (!NCDFastNames_Init(&o->names, i->params->iparams->string_index, NCDVal_StringMemRef(target_arg))) {
75 ModuleLog(i, BLOG_ERROR, "NCDFastNames_Init failed");
76 goto fail0;
77 }
78  
79 // signal up
80 NCDModuleInst_Backend_Up(o->i);
81 return;
82  
83 fail0:
84 NCDModuleInst_Backend_DeadError(i);
85 }
86  
87 static void func_die (void *vo)
88 {
89 struct instance *o = vo;
90  
91 NCDFastNames_Free(&o->names);
92  
93 NCDModuleInst_Backend_Dead(o->i);
94 }
95  
96 static int func_getobj (void *vo, NCD_string_id_t name, NCDObject *out_object)
97 {
98 struct instance *o = vo;
99  
100 NCD_string_id_t *names = NCDFastNames_GetNames(&o->names);
101  
102 NCDObject object;
103 if (!NCDModuleInst_Backend_GetObj(o->i, names[0], &object)) {
104 return 0;
105 }
106  
107 NCDObject obj2;
108 if (!NCDObject_ResolveObjExprCompact(&object, names + 1, NCDFastNames_GetNumNames(&o->names) - 1, &obj2)) {
109 return 0;
110 }
111  
112 if (name == NCD_STRING_EMPTY) {
113 *out_object = obj2;
114 return 1;
115 }
116  
117 return NCDObject_GetObj(&obj2, name, out_object);
118 }
119  
120 static struct NCDModule modules[] = {
121 {
122 .type = "alias",
123 .func_new2 = func_new,
124 .func_die = func_die,
125 .func_getobj = func_getobj,
126 .alloc_size = sizeof(struct instance)
127 }, {
128 .type = NULL
129 }
130 };
131  
132 const struct NCDModuleGroup ncdmodule_alias = {
133 .modules = modules
134 };