1 /*
2 * Copyright (c) 2021, The OpenThread Authors.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. Neither the name of the copyright holder nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 /**
30 * @file
31 * This file implements the `HeapString` (a heap allocated string).
32 */
33
34 #include "heap_string.hpp"
35
36 #include "common/code_utils.hpp"
37 #include "common/instance.hpp"
38 #include "common/string.hpp"
39
40 namespace ot {
41
Set(const char * aCString)42 Error HeapString::Set(const char *aCString)
43 {
44 Error error = kErrorNone;
45 size_t curSize;
46 size_t newSize;
47
48 VerifyOrExit(aCString != nullptr, Free());
49
50 curSize = (mStringBuffer != nullptr) ? strlen(mStringBuffer) + 1 : 0;
51 newSize = strlen(aCString) + 1;
52
53 if (curSize != newSize)
54 {
55 char *newBuffer = static_cast<char *>(Instance::HeapCAlloc(sizeof(char), newSize));
56
57 VerifyOrExit(newBuffer != nullptr, error = kErrorNoBufs);
58
59 Instance::HeapFree(mStringBuffer);
60 mStringBuffer = newBuffer;
61 }
62
63 memcpy(mStringBuffer, aCString, newSize);
64
65 exit:
66 return error;
67 }
68
Set(HeapString && aString)69 Error HeapString::Set(HeapString &&aString)
70 {
71 VerifyOrExit(mStringBuffer != aString.mStringBuffer);
72
73 Instance::HeapFree(mStringBuffer);
74 mStringBuffer = aString.mStringBuffer;
75 aString.mStringBuffer = nullptr;
76
77 exit:
78 return kErrorNone;
79 }
80
Free(void)81 void HeapString::Free(void)
82 {
83 Instance::HeapFree(mStringBuffer);
84 mStringBuffer = nullptr;
85 }
86
operator ==(const char * aCString) const87 bool HeapString::operator==(const char *aCString) const
88 {
89 bool isEqual;
90
91 VerifyOrExit((aCString != nullptr) && (mStringBuffer != nullptr), isEqual = (mStringBuffer == aCString));
92 isEqual = (strcmp(mStringBuffer, aCString) == 0);
93
94 exit:
95 return isEqual;
96 }
97
98 } // namespace ot
99
