Initial revision

1 files changed, 155 insertions, 0 deletions

diff --git a/ace/Read_Buffer.cpp b/ace/Read_Buffer.cpp
new file mode 100644
index 00000000000..9f49b7c7405
--- /dev/null
+++ b/ace/Read_Buffer.cpp
@@ -0,0 +1,155 @@
+// Read_Buffer.cpp
+// $Id$
+
+#define ACE_BUILD_DLL
+#include "ace/Read_Buffer.h"
+#include "ace/Service_Config.h"
+
+void
+ACE_Read_Buffer::dump (void) const
+{
+  ACE_TRACE ("ACE_Read_Buffer::dump");
+  ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
+  ACE_DEBUG ((LM_DEBUG, "size_ = %d", this->size_));
+  ACE_DEBUG ((LM_DEBUG, "\noccurrences_ = %d", this->occurrences_));
+  ACE_DEBUG ((LM_DEBUG, "\nstream_ = %x", this->stream_));
+  ACE_DEBUG ((LM_DEBUG, "\nallocator_ = %x", this->allocator_));
+  ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));    
+}
+
+ACE_Read_Buffer::ACE_Read_Buffer (FILE *fp,
+				  int close_on_delete,
+				  ACE_Allocator *allocator)
+  : stream_ (fp), 
+    close_on_delete_ (close_on_delete),
+    allocator_ (allocator)
+{
+  ACE_TRACE ("ACE_Read_Buffer::ACE_Read_Buffer");
+  if (this->allocator_ == 0)
+    this->allocator_ = ACE_Service_Config::allocator ();
+}
+
+ACE_Read_Buffer::ACE_Read_Buffer (int handle,
+				  int close_on_delete,
+				  ACE_Allocator *allocator)
+  : stream_ (::fdopen (handle, "r")),
+    close_on_delete_ (close_on_delete),
+    allocator_ (allocator)
+{
+  ACE_TRACE ("ACE_Read_Buffer::ACE_Read_Buffer");
+
+  if (this->allocator_ == 0)
+    this->allocator_ = ACE_Service_Config::allocator ();
+}
+
+ACE_Read_Buffer::~ACE_Read_Buffer (void)
+{
+  ACE_TRACE ("ACE_Read_Buffer::~ACE_Read_Buffer");
+
+  if (this->close_on_delete_)
+    ::fclose (this->stream_);
+}
+
+// Input: term        the character to terminate on
+//        search      the character to search for
+//	  replace     the character with which to replace search
+// Output: a buffer containing the contents of stream
+// Method: call the recursive helper function read_helper
+
+char *
+ACE_Read_Buffer::read (int term, int search, int replace)
+{
+  ACE_TRACE ("ACE_Read_Buffer::read");
+  this->occurrences_ = 0;
+  this->size_ = 0;
+  return this->rec_read (term, search, replace);
+}
+
+// Input: term       the termination character
+//        search     the character to search for
+//        replace    the character with which to replace search
+// Purpose: read in a file to a buffer using only a single dynamic
+//          allocation.
+// Method: read until the local buffer is full and then recurse.
+//         Must continue until the termination character is reached. 
+//         Allocate the final buffer based on the number of local
+//         buffers read and as the recursive calls bottom out, 
+//         copy them in reverse order into the allocated buffer.
+
+char *
+ACE_Read_Buffer::rec_read (int term, int search, int replace)
+{
+  ACE_TRACE ("ACE_Read_Buffer::rec_read");
+  // This is our temporary workspace.
+  char buf[BUFSIZ];
+
+  int c;
+  size_t index = 0;
+  int done = 0;
+  
+  // Read in the file char by char
+  while (index < BUFSIZ)
+    {
+      c = getc (this->stream_);
+
+      // Don't insert EOF into the buffer...
+      if (c == EOF)
+	{
+	  if (index == 0)
+	    return 0;
+	  else
+	    {
+	      ungetc (c, this->stream_);
+	      break;
+	    }
+	}
+      else if (c == term)
+	done = 1;
+
+      // Check for possible substitutions.
+      if (c == search) 
+	{
+	  this->occurrences_++;
+
+	  if (replace >= 0)
+	    c = replace;
+	}
+
+      buf[index++] = c;
+
+      // Substitutions must be made before checking for termination. 
+      if (done)
+	break;
+    }
+
+  // Increment the number of bytes.
+  this->size_ += index;
+
+  char *result;
+
+  // Recurse, when the recursion bottoms out, allocate the result
+  // buffer.
+  if (done || c == EOF)
+    {
+      // Use the allocator to acquire the memory.
+      result = (char *) this->allocator_->malloc (this->size_ * sizeof (char));
+
+      if (result == 0)
+	{
+	  errno = ENOMEM;
+	  return 0;
+	}
+      result += this->size_;
+    }
+  else if ((result = this->rec_read (term, search, replace)) == 0)
+    return 0;
+  
+  // Copy buf into the appropriate location starting from end of
+  // buffer.  Peter says this is confusing and that we should use
+  // memcpy() ;-)
+
+  for (size_t j = index; j > 0; j--)
+    *--result = buf[j - 1];
+
+  return result;
+}