|
Interleaved Deltas
Interleaved deltas, or SCCS weave is a method used by the Source Code Control System to store all revisions of a file. All lines from all revisions are "woven" together in a single block of data, with interspersed control instructions indicating which lines are included in which revisions of the file. Interleaved deltas are traditionally implemented with line oriented text files in mind, although nothing prevents the method from being applied to binary files as well. Interleaved deltas were first implemented by Marc Rochkind in the SCCS in 1975. Its design makes all versions available at the same time, so that it takes the same time to retrieve any revision. It also contains sufficient information to identify the author of each line (blaming) in one block. On the other hand, because all revisions for a file are parsed, every operation grows slower as more revisions are added. The term ''interleaved delta'' was coined later in 1982 by Walter F. Tichy, author of the Revision Control ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Source Code Control System
Source Code Control System (SCCS) is a version control system designed to track changes in source code and other text files during the development of a piece of software. This allows the user to retrieve any of the previous versions of the original source code and the changes which are stored. It was originally developed at Bell Labs beginning in late 1972 by Marc Rochkind for an IBM System/370 computer running OS/360. A characteristic feature of SCCS is the ''sccsid'' string that is embedded into source code, and automatically updated by SCCS for each revision. This example illustrates its use in the C programming language: static char sccsid[] = "@(#)ls.c 8.1 (Berkeley) 6/11/93"; This String (computer science), string contains the file name, date, and can also contain a comment. After compilation, the string can be found in binary and object files by looking for the pattern @(#) and can be used to determine which source code files were used during compilation. The ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |