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Path: utzoo!linus!decvax!mulga!munnari!basser!uqcspe!uqpsych!derek
From: derek@uqpsych.OZ (Derek Austin)
Newsgroups: net.sources
Subject: Line Editors and Arrow Keys Don't Mix
Message-ID: <104@uqpsych.OZ>
Date: Mon, 27-Aug-84 23:07:49 EDT
Article-I.D.: uqpsych.104
Posted: Mon Aug 27 23:07:49 1984
Date-Received: Thu, 13-Sep-84 03:36:15 EDT
Organization: Dept of Psychology, University of Queensland, Australia
Lines: 73

istakes are impossible to spot).

    I offer the humble program below to anyone who might have similar
problems.  I'd also be interested in a method for solving this problem
that doesn't involve an invocation of cc.  Even more interesting would
be a noncc method that could cope with up-arrows and down-arrows!
Anyone?

				ACSnet:  derek:uqpsych 
				UUCP:	 decvax!mulga!derek:uqpsych
				ARPA:    decvax!mulga!derek.uqpsych@Berkeley



-------------------------------------------------------------------
/***
** 	m a s s a g e
**
**	Distill a file suffering from left and right arrow
** 	key affliction.
**	Usage: massage left-arrow right-arrow <garbage 
*/
#include <stdio.h>
char *progname;
main( argc, argv )
int argc;  char *argv[];
{
    progname = *argv;
    if (argc != 3 ) {
	fprintf( stderr, "Usage: %s left-string right-string\n", progname);
	exit(1);
    }
    process( argv[1], argv[2] );
}

process( left, right )
char *left, *right;
{
    char buf[BUFSIZ];

    while( gets(buf) != (char *)NULL )
    {
	char betterbuf[BUFSIZ], *newptr, *oldptr;
	oldptr=buf; newptr=betterbuf; 
	while( *oldptr )
	{
	    if ( (oldptr+strlen(left) < buf+BUFSIZ) &&
		strncmp(left, oldptr, strlen(left)) == 0)
	    {
		if (newptr > betterbuf)
		    newptr--;
		oldptr += strlen(left);
	    }
	    else if ( (oldptr+strlen(right) < buf+BUFSIZ) &&
		strncmp(right, oldptr, strlen(right)) == 0)
	    {
		if (newptr < (betterbuf+BUFSIZ-1) )
		    newptr++;
		oldptr += strlen(right);
	    }
	    else
	       *newptr++ = *oldptr++;
	}
	*newptr = '\0';
	printf( "%s\n", betterbuf );
    }
}