Path: utzoo!attcan!uunet!mcvax!diku!dkuug!ambush!kimcm
From: kimcm@ambush.UUCP (Kim Chr. Madsen)
Newsgroups: comp.unix.wizards
Subject: Re^2: Kernel Hacks & Weird Filenames
Message-ID: <757@ambush.UUCP>
Date: 13 May 88 09:29:05 GMT
References: <13041@brl-adm.ARPA> <14020039@hpisod2.HP.COM> <326@augean.OZ> <56@lazlo.UUCP>
Organization: AmbraSoft A/S (Denmark)
Lines: 100

In article <56@lazlo.UUCP> ccs@lazlo.UUCP (Clifford C. Skolnick) writes:
>This solution will also handle any control strings for the terminal.  I
>wonder what "vi" would look like on his terminal :-).  Many things
>would break if you put the stuff in the kernel tty driver, let's leave
>it in the "ls" or "cat" command.  By the way, isn't there a Berkleyish
>type command "see" which does expand these things?  I seem to remember
>"ls | see" from somewhere, maybe it was Xenix.

The program see is found under Xenix and as far as I remember also on
BSD Systems, in System V it's an option to cat "cat -v" (v for
visible) will display all control characters as ^<character> as in ^C,
and all characters with 8'th bit set as M-<character> as M-a (Meta-a).

If you're missing such feature on your particular system here is a PD
version of see, it has some restrictions however it strips 8'th bit
of every byte (easy to fix) and prints ~<character> for non-printable
characters.  It was written for some Xenix III system which didn't
have the see command and look like another Xenix systems see command.

Regards,

Kim Chr. Madsen, AmbraSoft A/S, Rojelskaer 15, DK-2840 Holte (Denmark)
UUCP: kimcm@ambush.dk, PHONE: +45 2424 111, FAX: +45 2423 090

Your old men shall dream dreams, your young men shall see visions. 
					-- The Bible, Joel, II:28

----------------------------CUT HERE--------------------------------
/*
 * see - a program to view files containing non-printable characters.
 *
 * SYNOPSIS
 *	see [ file | - ] ...
 *
 * FORMAT OF OUTPUT
 *	See prints non-printable characters in the following order:
 *		000 - 040 : As the corresponding control characters,
 *			    preceeded by a caret '~'. Except the following
 *		LINEFEED  : Printed as a newline.
 *		TAB	  : Printed as a TAB character.
 *
 * PROGRAMMED BY
 *	Kim Chr. Madsen
 *	Wed Mar 12 12:30:19 DNT 1986
 */

#include <stdio.h>

main(argc,argv)
int	argc;
char	*argv[];
{
	int		i;
	FILE		*f;
	extern FILE	*fopen();
	extern void	visual();

	if (argc<2) {
		visual(stdin);
		exit(0);
	}
	for (i=1; i<argc; i++) {
		if (strcmp(argv[i],"-") == 0) {		/* stdin */
			visual(stdin);
			continue;
		}
		if ((f=fopen(argv[i],"r")) == (FILE *) NULL) {
			perror(argv[i]);
			continue;
		}
		visual(f);
		fclose(f);
	}
	putchar('\n');
}

void visual(f)
FILE	*f;
{
	unsigned short	c;

	while((c=getc(f)) != EOF) {
		c &= 0177;	/* Cut MSB */
		if (c<040) {
			switch (c) {
			case '\n':
				putchar('\n');
				break;
			case '\t':
				putchar('\t');
				break;
			default:
				printf("~%c",c+'@');
				break;
			}
			continue;
		}
		putchar(c);
	}
}