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1 office 1 /**
2 * @file strcmp.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 * String comparison module.
32 *
33 * Synopsis: strcmp(string str1, string str2)
34 * Variables:
35 * string (empty) - "true" if str1 and str2 are equal, "false" if not
36 */
37  
38 #include <stdlib.h>
39 #include <string.h>
40  
41 #include <ncd/module_common.h>
42  
43 #include <generated/blog_channel_ncd_strcmp.h>
44  
45 struct instance {
46 NCDModuleInst *i;
47 int result;
48 };
49  
50 static void func_new (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
51 {
52 struct instance *o = vo;
53 o->i = i;
54  
55 // check arguments
56 NCDValRef str1_arg;
57 NCDValRef str2_arg;
58 if (!NCDVal_ListRead(params->args, 2, &str1_arg, &str2_arg)) {
59 ModuleLog(i, BLOG_ERROR, "wrong arity");
60 goto fail0;
61 }
62 if (!NCDVal_IsString(str1_arg) || !NCDVal_IsString(str2_arg)) {
63 ModuleLog(i, BLOG_ERROR, "wrong type");
64 goto fail0;
65 }
66  
67 // compare
68 o->result = (NCDVal_Compare(str1_arg, str2_arg) == 0);
69  
70 // signal up
71 NCDModuleInst_Backend_Up(i);
72 return;
73  
74 fail0:
75 NCDModuleInst_Backend_DeadError(i);
76 }
77  
78 static int func_getvar2 (void *vo, NCD_string_id_t name, NCDValMem *mem, NCDValRef *out)
79 {
80 struct instance *o = vo;
81  
82 if (name == NCD_STRING_EMPTY) {
83 *out = ncd_make_boolean(mem, o->result);
84 return 1;
85 }
86  
87 return 0;
88 }
89  
90 static struct NCDModule modules[] = {
91 {
92 .type = "strcmp",
93 .func_new2 = func_new,
94 .func_getvar2 = func_getvar2,
95 .alloc_size = sizeof(struct instance)
96 }, {
97 .type = NULL
98 }
99 };
100  
101 const struct NCDModuleGroup ncdmodule_strcmp = {
102 .modules = modules
103 };