1/*
2 * Copyright (c) 2023 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#ifndef STRING_PRINTF_H
17#define STRING_PRINTF_H
18
19#include <cstdint>
20#include <cstdio>
21#include <string>
22#include <securec.h>
23
24namespace OHOS {
25namespace HiviewDFX {
26namespace {
27const int STRING_BUF_LEN = 4096;
28}
29
30static int BufferAppendV(char *buf, int size, const char *fmt, va_list ap)
31{
32    if (buf == nullptr || size <= 0) {
33        return -1;
34    }
35    int ret = vsnprintf_s(buf, size, size - 1, fmt, ap);
36    return ret;
37}
38
39static bool StringAppendV(std::string& dst, const char* fmt, va_list ap)
40{
41    char buffer[STRING_BUF_LEN] = {0};
42    va_list bakAp;
43    va_copy(bakAp, ap);
44    int ret = BufferAppendV(buffer, sizeof(buffer), fmt, bakAp);
45    va_end(bakAp);
46    if (ret > 0) {
47        dst.append(buffer, ret);
48    }
49    return ret != -1;
50}
51
52inline int BufferPrintf(char *buf, size_t size, const char *fmt, ...)
53{
54    va_list ap;
55    va_start(ap, fmt);
56    int ret = BufferAppendV(buf, size, fmt, ap);
57    va_end(ap);
58    return ret;
59}
60
61inline std::string StringPrintf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
62
63inline std::string StringPrintf(const char *fmt, ...)
64{
65    if (fmt == nullptr) {
66        return "";
67    }
68    std::string dst;
69    va_list ap;
70    va_start(ap, fmt);
71    StringAppendV(dst, fmt, ap);
72    va_end(ap);
73    return dst;
74}
75
76inline void StringAppendF(std::string& dst, const char* fmt, ...)
77{
78    va_list ap;
79    va_start(ap, fmt);
80    StringAppendV(dst, fmt, ap);
81    va_end(ap);
82}
83} // namespace HiviewDFX
84} // namespace OHOS
85#endif
86