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      1 /*
      2 * Copyright (c) 2014, 2016, The Linux Foundation. All rights reserved.
      3 *
      4 * Redistribution and use in source and binary forms, with or without modification, are permitted
      5 * provided that the following conditions are met:
      6 *    * Redistributions of source code must retain the above copyright notice, this list of
      7 *      conditions and the following disclaimer.
      8 *    * Redistributions in binary form must reproduce the above copyright notice, this list of
      9 *      conditions and the following disclaimer in the documentation and/or other materials provided
     10 *      with the distribution.
     11 *    * Neither the name of The Linux Foundation nor the names of its contributors may be used to
     12 *      endorse or promote products derived from this software without specific prior written
     13 *      permission.
     14 *
     15 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     17 * NON-INFRINGEMENT ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
     18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     19 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     21 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     22 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23 */
     24 
     25 #include <stdarg.h>
     26 #include <stdio.h>
     27 #include <string.h>
     28 #include <utils/constants.h>
     29 
     30 #include "dump_impl.h"
     31 
     32 namespace sdm {
     33 
     34 DumpImpl* DumpImpl::dump_list_[] = { 0 };
     35 uint32_t DumpImpl::dump_count_ = 0;
     36 
     37 DisplayError DumpInterface::GetDump(char *buffer, uint32_t length) {
     38   if (!buffer || !length) {
     39     return kErrorParameters;
     40   }
     41 
     42   buffer[0] = '\0';
     43   DumpImpl::AppendString(buffer, length, "\n-------- Snapdragon Display Manager --------");
     44   for (uint32_t i = 0; i < DumpImpl::dump_count_; i++) {
     45     DumpImpl::dump_list_[i]->AppendDump(buffer, length);
     46   }
     47   DumpImpl::AppendString(buffer, length, "\n\n");
     48 
     49   return kErrorNone;
     50 }
     51 
     52 DumpImpl::DumpImpl() {
     53   Register(this);
     54 }
     55 
     56 DumpImpl::~DumpImpl() {
     57   Unregister(this);
     58 }
     59 
     60 void DumpImpl::AppendString(char *buffer, uint32_t length, const char *format, ...) {
     61   uint32_t filled = UINT32(strlen(buffer));
     62   // Reserve one byte for null terminating character
     63   if ((filled + 1) >= length) {
     64     return;
     65   }
     66   buffer += filled;
     67 
     68   va_list list;
     69   va_start(list, format);
     70   vsnprintf(buffer, length - filled -1, format, list);
     71 }
     72 
     73 // Every object is created or destroyed through display core only, which itself protects the
     74 // the access, so no need to protect registration or de-registration.
     75 void DumpImpl::Register(DumpImpl *dump_impl) {
     76   if (dump_count_ < kMaxDumpObjects) {
     77     dump_list_[dump_count_] = dump_impl;
     78     dump_count_++;
     79   }
     80 }
     81 
     82 void DumpImpl::Unregister(DumpImpl *dump_impl) {
     83   for (uint32_t i = 0; i < dump_count_; i++) {
     84     if (dump_list_[i] == dump_impl) {
     85       dump_count_--;
     86       for (; i < dump_count_; i++) {
     87         dump_list_[i] = dump_list_[i + 1];
     88       }
     89     }
     90   }
     91 }
     92 
     93 }  // namespace sdm
     94 
     95