1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 
3 /*  CMetrics
4  *  ========
5  *  Copyright 2021 Eduardo Silva <eduardo@calyptia.com>
6  *
7  *  Licensed under the Apache License, Version 2.0 (the "License");
8  *  you may not use this file except in compliance with the License.
9  *  You may obtain a copy of the License at
10  *
11  *      http://www.apache.org/licenses/LICENSE-2.0
12  *
13  *  Unless required by applicable law or agreed to in writing, software
14  *  distributed under the License is distributed on an "AS IS" BASIS,
15  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16  *  See the License for the specific language governing permissions and
17  *  limitations under the License.
18  */
19 
20 #ifndef CMT_SDS_H
21 #define CMT_SDS_H
22 
23 /*
24  * This interface is a minimized version of Fluent Bit SDS just for easily
25  * string storage
26  */
27 
28 #include <stdlib.h>
29 #include <string.h>
30 #include <inttypes.h>
31 
32 #include <cmetrics/cmt_log.h>
33 
34 #define CMT_SDS_HEADER_SIZE (sizeof(uint64_t) + sizeof(uint64_t))
35 
36 typedef char *cmt_sds_t;
37 
38 #pragma pack(push, 1)
39 struct cmt_sds {
40     uint64_t len;        /* used */
41     uint64_t alloc;      /* excluding the header and null terminator */
42     char buf[];
43 };
44 #pragma pack(pop)
45 
46 #define CMT_SDS_HEADER(s)  ((struct cmt_sds *) (s - CMT_SDS_HEADER_SIZE))
47 
48 size_t cmt_sds_avail(cmt_sds_t s);
49 cmt_sds_t sds_alloc(size_t size);
50 size_t cmt_sds_alloc(cmt_sds_t s);
51 cmt_sds_t cmt_sds_increase(cmt_sds_t s, size_t len);
52 size_t cmt_sds_len(cmt_sds_t s);
53 cmt_sds_t cmt_sds_create_len(const char *str, int len);
54 cmt_sds_t cmt_sds_create(const char *str);
55 void cmt_sds_destroy(cmt_sds_t s);
56 cmt_sds_t cmt_sds_cat(cmt_sds_t s, const char *str, int len);
57 cmt_sds_t cmt_sds_create_size(size_t size);
58 void cmt_sds_set_len(cmt_sds_t s, size_t len);
59 void cmt_sds_cat_safe(cmt_sds_t *buf, const char *str, int len);
60 
61 #endif