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-Copyright (c) 1993-1994 by Xerox Corporation. All rights reserved.
-
-THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
-OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
-
-Permission is hereby granted to use or copy this program
-for any purpose, provided the above notices are retained on all copies.
-Permission to modify the code and to distribute modified code is granted,
-provided the above notices are retained, and a notice that the code was
-modified is included with the above copyright notice.
-
-Please send bug reports to Hans-J. Boehm (Hans_Boehm@hp.com or
-boehm@acm.org).
-
-This is a string packages that uses a tree-based representation.
-See cord.h for a description of the functions provided. Ec.h describes
-"extensible cords", which are essentially output streams that write
-to a cord. These allow for efficient construction of cords without
-requiring a bound on the size of a cord.
-
-More details on the data structure can be found in
-
-Boehm, Atkinson, and Plass, "Ropes: An Alternative to Strings",
-Software Practice and Experience 25, 12, December 1995, pp. 1315-1330.
-
-A fundamentally similar "rope" data structure is also part of SGI's standard
-template library implementation, and its descendents, which include the
-GNU C++ library. That uses reference counting by default.
-There is a short description of that data structure at
-http://reality.sgi.com/boehm/ropeimpl.html . (The more official location
-http://www.sgi.com/tech/stl/ropeimpl.html is missing a figure.)
-
-All of these are descendents of the "ropes" in Xerox Cedar.
-
-de.c is a very dumb text editor that illustrates the use of cords.
-It maintains a list of file versions. Each version is simply a
-cord representing the file contents. Nonetheless, standard
-editing operations are efficient, even on very large files.
-(Its 3 line "user manual" can be obtained by invoking it without
-arguments. Note that ^R^N and ^R^P move the cursor by
-almost a screen. It does not understand tabs, which will show
-up as highlighred "I"s. Use the UNIX "expand" program first.)
-To build the editor, type "make cord/de" in the gc directory.
-
-This package assumes an ANSI C compiler such as gcc. It will
-not compile with an old-style K&R compiler.
-
-Note that CORD_printf iand friends use C functions with variable numbers
-of arguments in non-standard-conforming ways. This code is known to
-break on some platforms, notably PowerPC. It should be possible to
-build the remainder of the library (everything but cordprnt.c) on
-any platform that supports the collector.
-