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      1 /*
      2  * Copyright (C) 2017 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 #include "chre/util/system/debug_dump.h"
     18 #include <cstdio>
     19 
     20 namespace chre {
     21 
     22 bool debugDumpPrint(char *buffer, size_t *bufferPos, size_t bufferSize,
     23                     const char *formatStr, ...) {
     24   bool success = false;
     25   if (*bufferPos < bufferSize) {
     26     va_list argList;
     27     va_start(argList, formatStr);
     28     int strLen = vsnprintf(&buffer[*bufferPos], bufferSize - *bufferPos,
     29                            formatStr, argList);
     30     va_end(argList);
     31 
     32     if (strLen >= 0) {
     33       size_t strLenBytes = static_cast<size_t>(strLen);
     34       if (bufferSize < strLenBytes ||
     35           *bufferPos >= (bufferSize - strLenBytes)) {
     36         *bufferPos = bufferSize;
     37         buffer[bufferSize - 1] = '\0';
     38       } else {
     39         *bufferPos += strLenBytes;
     40         success = true;
     41       }
     42     }
     43   }
     44 
     45   return success;
     46 }
     47 
     48 }  // namespace chre
     49