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1 office 1 /**
2 * @file index.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 * index index(string value)
33 * index index::next()
34 *
35 * Description:
36 * Non-negative integer with range of a size_t.
37 * The first form creates an index from the given decimal string.
38 * The second form cretes an index with value one more than an existing
39 * index.
40 *
41 * Variables:
42 * string (empty) - the index value. Note this may be different from
43 * than the value given to index() if it was not in normal form.
44 */
45  
46 #include <stdlib.h>
47 #include <string.h>
48  
49 #include <ncd/module_common.h>
50  
51 #include <generated/blog_channel_ncd_index.h>
52  
53 struct instance {
54 NCDModuleInst *i;
55 size_t value;
56 };
57  
58 static void func_new_templ (void *vo, NCDModuleInst *i, size_t value)
59 {
60 struct instance *o = vo;
61 o->i = i;
62  
63 // set value
64 o->value = value;
65  
66 // signal up
67 NCDModuleInst_Backend_Up(o->i);
68 }
69  
70 static void func_new_from_value (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
71 {
72 // read arguments
73 NCDValRef arg_value;
74 if (!NCDVal_ListRead(params->args, 1, &arg_value)) {
75 ModuleLog(i, BLOG_ERROR, "wrong arity");
76 goto fail0;
77 }
78  
79 // parse value
80 uintmax_t value;
81 if (!ncd_read_uintmax(arg_value, &value)) {
82 ModuleLog(i, BLOG_ERROR, "wrong value");
83 goto fail0;
84 }
85  
86 // check overflow
87 if (value > SIZE_MAX) {
88 ModuleLog(i, BLOG_ERROR, "value too large");
89 goto fail0;
90 }
91  
92 func_new_templ(vo, i, value);
93 return;
94  
95 fail0:
96 NCDModuleInst_Backend_DeadError(i);
97 }
98  
99 static void func_new_from_index (void *vo, NCDModuleInst *i, const struct NCDModuleInst_new_params *params)
100 {
101 struct instance *index = NCDModuleInst_Backend_GetUser((NCDModuleInst *)params->method_user);
102  
103 // check overflow
104 if (index->value == SIZE_MAX) {
105 ModuleLog(i, BLOG_ERROR, "overflow");
106 goto fail0;
107 }
108  
109 func_new_templ(vo, i, index->value + 1);
110 return;
111  
112 fail0:
113 NCDModuleInst_Backend_DeadError(i);
114 }
115  
116 static void func_die (void *vo)
117 {
118 struct instance *o = vo;
119  
120 NCDModuleInst_Backend_Dead(o->i);
121 }
122  
123 static int func_getvar (void *vo, const char *name, NCDValMem *mem, NCDValRef *out)
124 {
125 struct instance *o = vo;
126  
127 if (!strcmp(name, "")) {
128 *out = ncd_make_uintmax(mem, o->value);
129 return 1;
130 }
131  
132 return 0;
133 }
134  
135 static struct NCDModule modules[] = {
136 {
137 .type = "index",
138 .func_new2 = func_new_from_value,
139 .func_die = func_die,
140 .func_getvar = func_getvar,
141 .alloc_size = sizeof(struct instance)
142 }, {
143 .type = "index::next",
144 .base_type = "index",
145 .func_new2 = func_new_from_index,
146 .func_die = func_die,
147 .func_getvar = func_getvar,
148 .alloc_size = sizeof(struct instance)
149 }, {
150 .type = NULL
151 }
152 };
153  
154 const struct NCDModuleGroup ncdmodule_index = {
155 .modules = modules
156 };