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fbm12s.lha
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idiff.c
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C/C++ Source or Header
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1994-07-18
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56 lines
/*****************************************************************
* 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;
}
}
}