/*-
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Rodney Ruddock of the University of Guelph.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)m.c	5.4 (Berkeley) 03/08/93";
#endif /* not lint */

#include <sys/types.h>

#include <regex.h>
#include <setjmp.h>
#include <stdio.h>
#include <string.h>

#ifdef DBI
#include <db.h>
#endif

#include "ed.h"
#include "extern.h"

/*
 * Move the specified lines to the new location. It's quick 'cause
 * just a couple of pointers are redirected.
 */
void
m(inputt, errnum)
	FILE *inputt;
	int *errnum;
{
	LINE *l_dest=NULL, *l_old_top, *l_old_bottom;

	/* Set l_dest here. */
	if (((ss = getc(inputt)) != '\n') && (ss != EOF)) {
		for (;;) {
			if (ss != ' ') {
				ungetc(ss, inputt);
				break;
			}
			ss = getc(inputt);
		}
		l_dest = address_conv(NULL, inputt, errnum);
	} else
		(ungetc(ss, inputt), *errnum = -1);
	if (*errnum < 0) {
		strcpy(help_msg, "bad destination address");
		return;
	}
	*errnum = 0;
	if (rol(inputt, errnum))
		return;

	if (Start_default && End_default)
		Start = End = current;
	else
		if (Start_default)
			Start = End;
	if (Start == NULL) {
		strcpy(help_msg, "buffer empty");
		*errnum = -1;
		return;
	}
	Start_default = End_default = 0;

	/* Do some address checking. */
	if ((l_dest) && ((l_dest == Start) ||
	    (address_check(l_dest, Start) == -1)) &&
	    (address_check(End, l_dest) == -1)) {
		ungetc(ss, inputt);
		*errnum = -1;
		strcpy(help_msg, "destination address in address range");
		return;
	}
	change_flag = 1;
	if (g_flag == 0)
		u_clr_stk();

	/*
	 * Some more address checking. These are "legal" command constructions
	 * but are kind-a useless since the buffer doesn't change.
	 */
	*errnum = 1;
	if ((Start == l_dest) || (End == l_dest))
		return;
	if ((Start == top) && (End == bottom))
		return;
	if ((Start == top) && (l_dest == NULL))
		return;
	*errnum = 0;

	l_old_top = top;
	l_old_bottom = bottom;

	sigspecial++;

	if (Start == top) {
		top = End->below;
		u_add_stk(&(End->below->above));
		top->above = NULL;
	} else
		if (End == bottom) {
			bottom = Start->above;
			u_add_stk(&(Start->above->below));
			bottom->below = NULL;
		} else {
			u_add_stk(&(Start->above->below));
			Start->above->below = End->below;
			u_add_stk(&(End->below->above));
			End->below->above = Start->above;
		}

	if (l_dest == NULL) {
		u_add_stk(&(Start->above));
		Start->above = NULL;
		u_add_stk(&(End->below));
		End->below = l_old_top;
		u_add_stk(&(l_old_top->above));
		l_old_top->above = End;
		top = Start;
	} else
		if (l_dest == l_old_bottom) {
			u_add_stk(&(End->below));
			End->below = NULL;
			u_add_stk(&(Start->above));
			Start->above = l_dest;
			u_add_stk(&(l_dest->below));
			l_dest->below = Start;
			bottom = End;
		} else {
			u_add_stk(&(Start->above));
			Start->above = l_dest;
			u_add_stk(&(End->below));
			End->below = l_dest->below;
			u_add_stk(&(l_dest->below->above));
			l_dest->below->above = End;
			u_add_stk(&(l_dest->below));
			l_dest->below = Start;
		}

	if (l_dest)
		l_dest->below = Start;
	current = Start;

	sigspecial--;

	*errnum = 1;
}