/*	$NetBSD: map.c,v 1.13 2011/09/06 18:34:12 joerg Exp $	*/

/*-
 * Copyright (c) 1991, 1993
 *	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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)map.c	8.1 (Berkeley) 6/9/93";
#endif
__RCSID("$NetBSD: map.c,v 1.13 2011/09/06 18:34:12 joerg Exp $");
#endif /* not lint */

#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <term.h>
#include <termios.h>
#include "extern.h"

static int	baudrate(char *);

/* Baud rate conditionals for mapping. */
#define	GT		0x01
#define	EQ		0x02
#define	LT		0x04
#define	NOT		0x08
#define	GE		(GT | EQ)
#define	LE		(LT | EQ)

typedef struct map {
	struct map *next;	/* Linked list of maps. */
	const char *porttype;	/* Port type, or "" for any. */
	const char *type;	/* Terminal type to select. */
	int conditional;	/* Baud rate conditionals bitmask. */
	int speed;		/* Baud rate to compare against. */
} MAP;

static MAP *cur, *maplist;

/*
 * Syntax for -m:
 * [port-type][test baudrate]:terminal-type
 * The baud rate tests are: >, <, @, =, !
 */
void
add_mapping(const char *port, char *arg)
{
	MAP *mapp;
	char *copy, *p, *termp;

	copy = strdup(arg);
	mapp = malloc((u_int)sizeof(MAP));
	if (copy == NULL || mapp == NULL)
		err(1, "malloc");
	mapp->next = NULL;
	if (maplist == NULL)
		cur = maplist = mapp;
	else {
		cur->next = mapp;
		cur =  mapp;
	}

	mapp->porttype = arg;
	mapp->conditional = 0;

	arg = strpbrk(arg, "><@=!:");

	if (arg == NULL) {			/* [?]term */
		mapp->type = mapp->porttype;
		mapp->porttype = NULL;
		goto done;
	}

	if (arg == mapp->porttype)		/* [><@=! baud]:term */
		mapp->porttype = termp = NULL;
	else
		termp = arg;

	for (;; ++arg)				/* Optional conditionals. */
		switch(*arg) {
		case '<':
			if (mapp->conditional & GT)
				goto badmopt;
			mapp->conditional |= LT;
			break;
		case '>':
			if (mapp->conditional & LT)
				goto badmopt;
			mapp->conditional |= GT;
			break;
		case '@':
		case '=':			/* Not documented. */
			mapp->conditional |= EQ;
			break;
		case '!':
			mapp->conditional |= NOT;
			break;
		default:
			goto next;
		}

next:	if (*arg == ':') {
		if (mapp->conditional)
			goto badmopt;
		++arg;
	} else {				/* Optional baudrate. */
		arg = strchr(p = arg, ':');
		if (arg == NULL)
			goto badmopt;
		*arg++ = '\0';
		mapp->speed = baudrate(p);
	}

	if (*arg == '\0')			/* Non-optional type. */
		goto badmopt;

	mapp->type = arg;

	/* Terminate porttype, if specified. */
	if (termp != NULL)
		*termp = '\0';

	/* If a NOT conditional, reverse the test. */
	if (mapp->conditional & NOT)
		mapp->conditional = ~mapp->conditional & (EQ | GT | LT);

	/* If user specified a port with an option flag, set it. */
done:	if (port) {
		if (mapp->porttype)
badmopt:		errx(1, "illegal -m option format: %s", copy);
		mapp->porttype = port;
	}

#ifdef MAPDEBUG
	(void)printf("port: %s\n", mapp->porttype ? mapp->porttype : "ANY");
	(void)printf("type: %s\n", mapp->type);
	(void)printf("conditional: ");
	p = "";
	if (mapp->conditional & GT) {
		(void)printf("GT");
		p = "/";
	}
	if (mapp->conditional & EQ) {
		(void)printf("%sEQ", p);
		p = "/";
	}
	if (mapp->conditional & LT)
		(void)printf("%sLT", p);
	(void)printf("\nspeed: %d\n", mapp->speed);
#endif
	free(copy);
}

/*
 * Return the type of terminal to use for a port of type 'type', as specified
 * by the first applicable mapping in 'map'.  If no mappings apply, return
 * 'type'.
 */
const char *
mapped(const char *type)
{
	MAP *mapp;
	int match;

	match = 0;
	for (mapp = maplist; mapp; mapp = mapp->next)
		if (mapp->porttype == NULL || !strcmp(mapp->porttype, type)) {
			switch (mapp->conditional) {
			case 0:			/* No test specified. */
				match = 1;
				break;
			case EQ:
				match = (ospeed == mapp->speed);
				break;
			case GE:
				match = (ospeed >= mapp->speed);
				break;
			case GT:
				match = (ospeed > mapp->speed);
				break;
			case LE:
				match = (ospeed <= mapp->speed);
				break;
			case LT:
				match = (ospeed < mapp->speed);
				break;
			}
			if (match)
				return (mapp->type);
		}
	/* No match found; return given type. */
	return (type);
}

static int
baudrate(char *rate)
{

	/* The baudrate number can be preceded by a 'B', which is ignored. */
	if (*rate == 'B')
		++rate;

	return (atoi(rate));
}