usr/src/usr.lib/lib2648/rdchar.c

/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)rdchar.c    5.1 (Berkeley) 4/26/85";
#endif not lint

/*
 * rdchar: returns a readable representation of an ASCII char, using ^ notation.
 */

#include <ctype.h>

char *rdchar(c)
char c;
{
        static char ret[4];
        register char *p;

        /*
         * Due to a bug in isprint, this prints spaces as ^`, but this is OK
         * because we want something to show up on the screen.
         */
        ret[0] = ((c&0377) > 0177) ? '\'' : ' ';
        c &= 0177;
        ret[1] = isprint(c) ? ' ' : '^';
        ret[2] = isprint(c) ?  c  : c^0100;
        ret[3] = 0;
        for (p=ret; *p==' '; p++)
                ;
        return (p);
}