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 <cstdio>
20 #include <string>
21 #include <securec.h>
22
23 namespace OHOS {
24 namespace HiviewDFX {
25
BufferAppendV(char * buf,int size,const char * fmt,va_list ap)26 inline int BufferAppendV(char *buf, int size, const char *fmt, va_list ap)
27 {
28 if (buf == nullptr || size <= 0) {
29 return -1;
30 }
31 int ret = vsnprintf_s(buf, size, size - 1, fmt, ap);
32 return ret;
33 }
34
StringAppendV(std::string & dst,const char * fmt,va_list ap)35 inline bool StringAppendV(std::string& dst, const char* fmt, va_list ap)
36 {
37 constexpr int stringBufLen = 4096;
38 char buffer[stringBufLen] = {0};
39 va_list bakAp;
40 va_copy(bakAp, ap);
41 int ret = BufferAppendV(buffer, sizeof(buffer), fmt, bakAp);
42 va_end(bakAp);
43 if (ret > 0) {
44 dst.append(buffer, ret);
45 }
46 return ret != -1;
47 }
48
BufferPrintf(char * buf,size_t size,const char * fmt,...)49 inline int BufferPrintf(char *buf, size_t size, const char *fmt, ...)
50 {
51 va_list ap;
52 va_start(ap, fmt);
53 int ret = BufferAppendV(buf, size, fmt, ap);
54 va_end(ap);
55 return ret;
56 }
57
58 inline std::string StringPrintf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
59
StringPrintf(const char * fmt,...)60 inline std::string StringPrintf(const char *fmt, ...)
61 {
62 if (fmt == nullptr) {
63 return "";
64 }
65 std::string dst;
66 va_list ap;
67 va_start(ap, fmt);
68 StringAppendV(dst, fmt, ap);
69 va_end(ap);
70 return dst;
71 }
72
StringAppendF(std::string & dst,const char * fmt,...)73 inline void StringAppendF(std::string& dst, const char* fmt, ...)
74 {
75 va_list ap;
76 va_start(ap, fmt);
77 StringAppendV(dst, fmt, ap);
78 va_end(ap);
79 }
80 } // namespace HiviewDFX
81 } // namespace OHOS
82 #endif
83