/*-
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)cchar.c	5.6 (Berkeley) 07/10/92";
#endif /* not lint */

#include <sys/types.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,
	"quit",		VQUIT,		CQUIT,
	"reprint",	VREPRINT, 	CREPRINT,
	"start",	VSTART,		CSTART,
	"status",	VSTATUS, 	CSTATUS,
	"stop",		VSTOP,		CSTOP,
	"susp",		VSUSP,		CSUSP,
	"werase",	VWERASE,	CWERASE,
	NULL,
};

struct cchar cchars2[] = {
	"brk",		VEOL,		CEOL,
	"flush",	VDISCARD, 	CDISCARD,
	"rprnt",	VREPRINT, 	CREPRINT,
	NULL,
};

csearch(argvp, ip)
	char ***argvp;
	struct info *ip;
{
	extern char *usage;
	register struct cchar *cp;
	struct cchar tmp;
	char *arg, *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)
		err("option requires an argument -- %s\n%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 (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));
}