1 /*
2 * Copyright (C) 2019 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef INCLUDE_PERFETTO_PROFILING_NORMALIZE_H_
18 #define INCLUDE_PERFETTO_PROFILING_NORMALIZE_H_
19
20 // Header only code that gets used in other projects.
21 // This is currently used in
22 // * ART
23 // * Bionic
24 // * Heapprofd
25 //
26 // DO NOT USE THE STL HERE. This gets used in parts of Bionic that do not
27 // use the STL.
28
29 #include <string.h>
30
31 namespace perfetto {
32 namespace profiling {
33
34 // Normalize cmdline in place. Stores new beginning of string in *cmdline_ptr.
35 // Returns new size of string (from new beginning).
36 // Modifies string in *cmdline_ptr.
NormalizeCmdLine(char ** cmdline_ptr,size_t size)37 static ssize_t NormalizeCmdLine(char** cmdline_ptr, size_t size) {
38 char* cmdline = *cmdline_ptr;
39 char* first_arg = static_cast<char*>(memchr(cmdline, '\0', size));
40 if (first_arg == nullptr) {
41 errno = EOVERFLOW;
42 return -1;
43 }
44 // For consistency with what we do with Java app cmdlines, trim everything
45 // after the @ sign of the first arg.
46 char* first_at = static_cast<char*>(memchr(cmdline, '@', size));
47 if (first_at != nullptr && first_at < first_arg) {
48 *first_at = '\0';
49 first_arg = first_at;
50 }
51 char* start = static_cast<char*>(
52 memrchr(cmdline, '/', static_cast<size_t>(first_arg - cmdline)));
53 if (start == nullptr) {
54 start = cmdline;
55 } else {
56 // Skip the /.
57 start++;
58 }
59 *cmdline_ptr = start;
60 return first_arg - start;
61 }
62
63 } // namespace profiling
64 } // namespace perfetto
65
66 #endif // INCLUDE_PERFETTO_PROFILING_NORMALIZE_H_
67