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
24 namespace OHOS {
25 namespace HiviewDFX {
26 namespace {
27 const int STRING_BUF_LEN = 4096;
28 }
29
BufferAppendV(char * buf,int size,const char * fmt,va_list ap)30 static 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
StringAppendV(std::string & dst,const char * fmt,va_list ap)39 static 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
BufferPrintf(char * buf,size_t size,const char * fmt,...)52 inline 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
61 inline std::string StringPrintf(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
62
StringPrintf(const char * fmt,...)63 inline 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
StringAppendF(std::string & dst,const char * fmt,...)76 inline 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