src/kits/debugger/model/TeamMemory.cpp

   1 /*
   2  * Copyright 2009, Ingo Weinhold, ingo_weinhold@gmx.de.
   3  * Distributed under the terms of the MIT License.
   4  */
   5
   6
   7 #include "TeamMemory.h"
   8
   9 #include <algorithm>
  10
  11 #include <OS.h>
  12 #include <String.h>
  13
  14
  15 TeamMemory::~TeamMemory()
  16 {
  17 }
  18
  19
  20 status_t
  21 TeamMemory::ReadMemoryString(target_addr_t address, size_t maxLength,
  22         BString& _string)
  23 {
  24         char buffer[B_PAGE_SIZE];
  25
  26         _string.Truncate(0);
  27         while (maxLength > 0) {
  28                 // read at max maxLength bytes, but don't read across page bounds
  29                 size_t toRead = std::min(maxLength,
  30                         B_PAGE_SIZE - size_t(address % B_PAGE_SIZE));
  31                 ssize_t bytesRead = ReadMemory(address, buffer, toRead);
  32                 if (bytesRead < 0)
  33                         return _string.Length() == 0 ? bytesRead : B_OK;
  34
  35                 if (bytesRead == 0)
  36                         return _string.Length() == 0 ? B_BAD_ADDRESS : B_OK;
  37
  38                 // append the bytes read
  39                 size_t length = strnlen(buffer, bytesRead);
  40                 _string.Append(buffer, length);
  41
  42                 // stop at end of string
  43                 if (length < (size_t)bytesRead)
  44                         return B_OK;
  45
  46                 address += bytesRead;
  47                 maxLength -= bytesRead;
  48         }
  49
  50         return B_OK;
  51 }
  52