From:	"Damian Yerrick" <snews AT pineight DOT 8m DOT comMUNIST-PIGS-AOL>
Newsgroups:	comp.os.msdos.djgpp
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Subject:	Pitiful attempt to bring this thread back on topic
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NNTP-Posting-Date:	Sat, 08 Jan 2000 02:37:55 GMT
Distribution:	world
Date:	Sat, 08 Jan 2000 02:37:56 GMT
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

Today, my two newsgroups collide.

I just wrote:
> "Wilmer van der Gaast" <lintux AT dds DOT nl> wrote:
> > I understand the first part, of course, it's funny, although I
> > don't know what's really bad about AOL.

http://www.anti-aol.org/

> > But what does the second
> > part mean??? Does it mean anything at all??
>
> Maybe I'll try coding up a multi-rot program. Good way
> to kill an hour.

I just did. It handles forward and backward rotation
in the ASCII alphabet (upper and lower case).
Anyone see any glaring "issues" in this program?
I've already tried it with my tiny test suite
(hal <--> ibm, two passes of rot13 on several files).

[[[ cut here --------------------- cut here ]]]

/* ROT.C by Damian Yerrick

    Rotates the ASCII letters in foo.txt forward by n letters.
    Copyright (C) 2000 Damian Yerrick

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You can find a copy of the GNU General Public License at
    http://www.gnu.org/copyleft/gpl.html

    You can reach Damian Yerrick at d_yerrick AT hotmail DOT com
    Visit his web site at http://come.to/yerrick


Use examples:
    rot 13 < foo.txt
    echo HAL | rot 1
    echo hello world | rot 13 | rot 13

*/

#include <stdio.h>
#include <stdlib.h>

int chrrotate(int letter, int rot)
{
  if(letter >= 'A' && letter <= 'Z')
  {
    letter += rot;
    if(letter > 'Z')
      letter -= 26;
  }
  else if(letter >= 'a' && letter <= 'z')
  {
    letter += rot;
    if(letter > 'z')
      letter -= 26;
  }

  return letter;
}

int main(int argc, char **argv)
{
  int rotn = 13;

  if(argc >= 2)
    rotn = atoi(argv[1]);

  /* get rotn above 0 but under 26 */
  rotn = (rotn + 26 * (rotn / 26 + 1)) % 26;
/*
  printf("rot%d\n", rotn);
*/

  while(!feof(stdin))
    putchar(chrrotate(getchar(), rotn));

  return 0;
}

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