From eff0d77e07cdde7a18540fc1599c3e0cb63b99fb Mon Sep 17 00:00:00 2001
From: David Rose <david@ddrose.com>
Date: Thu, 17 Oct 2002 04:37:23 +0000
Subject: [PATCH] Ramfile::readline()

---
 panda/src/express/buffer.I   |  1 +
 panda/src/express/buffer.cxx | 29 +++++++++++++++++++++++++++++
 panda/src/express/buffer.h   |  5 ++++-
 3 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/panda/src/express/buffer.I b/panda/src/express/buffer.I
index 12e02a1b69..444832b2ba 100644
--- a/panda/src/express/buffer.I
+++ b/panda/src/express/buffer.I
@@ -33,4 +33,5 @@ get_length(void) const {
 ////////////////////////////////////////////////////////////////////
 INLINE Ramfile::
 Ramfile(void) {
+  _pos = 0;
 }
diff --git a/panda/src/express/buffer.cxx b/panda/src/express/buffer.cxx
index 33c4e96788..7973362702 100644
--- a/panda/src/express/buffer.cxx
+++ b/panda/src/express/buffer.cxx
@@ -41,3 +41,32 @@ Buffer::
 ~Buffer() {
   delete _buffer;
 }
+
+
+////////////////////////////////////////////////////////////////////
+//     Function: Ramfile::readline
+//       Access: Published
+//  Description: Assumes the stream represents a text file, and
+//               extracts one line up to and including the trailing
+//               newline character.  Returns empty string when the end
+//               of file is reached.
+//
+//               The interface here is intentionally designed to be
+//               similar to that for Python's File.readline()
+//               function.
+////////////////////////////////////////////////////////////////////
+string Ramfile::
+readline() {
+  size_t start = _pos;
+  while (_pos < _data.length() && _data[_pos] != '\n') {
+    ++_pos;
+  }
+
+  if (_pos < _data.length() && _data[_pos] == '\n') {
+    // Include the newline character also.
+    ++_pos;
+  }
+
+  return _data.substr(start, _pos - start);
+}
+
diff --git a/panda/src/express/buffer.h b/panda/src/express/buffer.h
index 546f169f32..e743d8ca4e 100644
--- a/panda/src/express/buffer.h
+++ b/panda/src/express/buffer.h
@@ -52,9 +52,12 @@ private:
 ////////////////////////////////////////////////////////////////////
 class EXPCL_PANDAEXPRESS Ramfile {
 PUBLISHED:
-  INLINE Ramfile(void);
+  INLINE Ramfile();
+
+  string readline();
 
 public:
+  size_t _pos;
   string _data;
 };