xref: /src/bin/stty/cchar.c

/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
/*static char sccsid[] = "from: @(#)cchar.c	5.4 (Berkeley) 6/10/91";*/
static char rcsid[] = "$Id: cchar.c,v 1.7 1994/03/23 04:05:24 mycroft Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <err.h>
#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include "stty.h"
#include "extern.h"

/*
 * Special control characters.
 *
 * Cchars1 are the standard names, cchars2 are the old aliases.
 * The first are displayed, but both are recognized on the
 * command line.
 */
struct cchar cchars1[] = {
	"discard",	VDISCARD, 	CDISCARD,
	"dsusp", 	VDSUSP,		CDSUSP,
	"eof",		VEOF,		CEOF,
	"eol",		VEOL,		CEOL,
	"eol2",		VEOL2,		CEOL,
	"erase",	VERASE,		CERASE,
	"intr",		VINTR,		CINTR,
	"kill",		VKILL,		CKILL,
	"lnext",	VLNEXT,		CLNEXT,
	"min",		VMIN,		CMIN,
	"quit",		VQUIT,		CQUIT,
	"reprint",	VREPRINT, 	CREPRINT,
	"start",	VSTART,		CSTART,
	"status",	VSTATUS, 	CSTATUS,
	"stop",		VSTOP,		CSTOP,
	"susp",		VSUSP,		CSUSP,
	"time",		VTIME,		CTIME,
	"werase",	VWERASE,	CWERASE,
	NULL,
};

struct cchar cchars2[] = {
	"brk",		VEOL,		CEOL,
	"flush",	VDISCARD, 	CDISCARD,
	"rprnt",	VREPRINT, 	CREPRINT,
	"xoff",		VSTOP,		CSTOP,
	"xon",		VSTART,		CSTART,
	NULL,
};

csearch(argvp, ip)
	char ***argvp;
	struct info *ip;
{
	register struct cchar *cp;
	struct cchar tmp;
	long val;
	char *arg, *ep, *name;
	static int c_cchar __P((const void *, const void *));

	name = **argvp;

	tmp.name = name;
	if (!(cp = (struct cchar *)bsearch(&tmp, cchars1,
	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
	    c_cchar)) && !(cp = (struct cchar *)bsearch(&tmp, cchars1,
	    sizeof(cchars1)/sizeof(struct cchar) - 1, sizeof(struct cchar),
	    c_cchar)))
		return(0);

	arg = *++*argvp;
	if (!arg) {
		warnx("option requires an argument -- %s", name);
		usage();
	}

#define CHK(s)  (*arg == s[0] && !strcmp(arg, s))
	if (CHK("undef") || CHK("<undef>"))
		ip->t.c_cc[cp->sub] = _POSIX_VDISABLE;
	else if (cp->sub == VMIN || cp->sub == VTIME) {
		val = strtol(arg, &ep, 10);
		if (val == _POSIX_VDISABLE) {
			warnx("value of %ld would disable the option -- %s",
			    val, name);
			usage();
		}
		if (val > UCHAR_MAX) {
			warnx("maximum option value is %d -- %s",
			    UCHAR_MAX, name);
			usage();
		}
		if (*ep != '\0') {
			warnx("option requires a numeric argument -- %s", name);
			usage();
		}
		ip->t.c_cc[cp->sub] = val;
	} else if (arg[0] == '^')
		ip->t.c_cc[cp->sub] = (arg[1] == '?') ? 0177 :
		    (arg[1] == '-') ? _POSIX_VDISABLE : arg[1] & 037;
	else
		ip->t.c_cc[cp->sub] = arg[0];
	ip->set = 1;
	return(1);
}

static
c_cchar(a, b)
        const void *a, *b;
{
        return(strcmp(((struct cchar *)a)->name, ((struct cchar *)b)->name));
}