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- /*****************************************************************
- * idiff.c: FBM Release 1.0 25-Feb-90 Michael Mauldin
- *
- * Copyright (C) 1989,1990 by Michael Mauldin. Permission is granted
- * to use this file in whole or in part for any purpose, educational,
- * recreational or commercial, provided that this copyright notice
- * is retained unchanged. This software is available to all free of
- * charge by anonymous FTP and in the UUNET archives.
- *
- * idiff.c:
- *
- * USAGE
- * % idiff [ flags ] arguments
- *
- * EDITLOG
- * LastEditDate = Mon Jun 25 00:18:20 1990 - Michael Mauldin
- * LastFileName = /usr2/mlm/src/misc/fbm/idiff.c
- *
- * HISTORY
- * 25-Jun-90 Michael Mauldin (mlm@cs.cmu.edu) Carnegie Mellon
- * Package for Release 1.0
- *
- * 07-Mar-89 Michael Mauldin (mlm) at Carnegie Mellon University
- * Beta release (version 0.9) mlm@cs.cmu.edu
- *
- * 18-Aug-88 Michael Mauldin (mlm) at Carnegie-Mellon University
- * Created.
- *****************************************************************/
-
- # include <stdio.h>
-
- # define USAGE \
- "Usage: idiff < original > delta\n udiff < delta > original"
-
- #ifndef lint
- static char *fbmid =
- "$FBM idiff.c <1.0> 25-Jun-90 (C) 1989,1990 by Michael Mauldin, source \
- code available free from MLM@CS.CMU.EDU and from UUNET archives$";
- #endif
-
- main (argc, argv)
- char *argv[];
- { register int ch, lastch=0;
-
- if (argc > 1 || !strcmp (argv[0] + strlen (argv[0]) - 5, "udiff"))
- { while ((ch = getchar ()) != EOF)
- { putchar (lastch = ((ch+lastch) & 255)); }
- }
- else
- { while ((ch = getchar ()) != EOF)
- { putchar ((ch-lastch) & 255);
- lastch = ch;
- }
- }
- }
-