Added ReadMemoryString(), reading a string from the team's memory.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33589 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/debugger/model/TeamMemory.cpp

@@ -3,9 +3,52 @@
  * Distributed under the terms of the MIT License.
  */
 
+
 #include "TeamMemory.h"
 
+#include <algorithm>
+
+#include <OS.h>
+#include <String.h>
+
 
 TeamMemory::~TeamMemory()
 {
 }
+
+
+status_t
+TeamMemory::ReadMemoryString(target_addr_t address, size_t maxLength,
+	BString& _string)
+{
+	char buffer[B_PAGE_SIZE];
+
+	BString string;
+
+	while (maxLength > 0) {
+		// read at max maxLength bytes, but don't read across page bounds
+		size_t toRead = std::min(maxLength,
+			B_PAGE_SIZE - size_t(address % B_PAGE_SIZE));
+
+		ssize_t bytesRead = ReadMemory(address, buffer, toRead);
+		if (bytesRead < 0)
+			return string.Length() == 0 ? bytesRead : B_OK;
+
+		if (bytesRead == 0)
+			return string.Length() == 0 ? B_BAD_ADDRESS : B_OK;
+
+		// append the bytes read
+		size_t length = strnlen(buffer, bytesRead);
+		string.Append(buffer, length);
+
+		// stop at end of string
+		if (length < (size_t)bytesRead)
+			return B_OK;
+
+		address += bytesRead;
+		maxLength -= bytesRead;
+	}
+
+	return B_OK;
+}
+

src/apps/debugger/model/TeamMemory.h

@@ -5,9 +5,13 @@
 #ifndef TEAM_MEMORY_H
 #define TEAM_MEMORY_H
 
+
 #include "TargetAddressRange.h"
 
 
+class BString;
+
+
 class TeamMemory {
 public:
 	virtual						~TeamMemory();
@@ -15,6 +19,8 @@ public:
 
 	virtual	ssize_t				ReadMemory(target_addr_t address, void* buffer,
 									size_t size) = 0;
+	virtual	status_t			ReadMemoryString(target_addr_t address,
+									size_t maxLength, BString& _string);
 };