BSD 4_4 release

[unix-history] / usr / src / contrib / ed / m.c

/*-
* Copyright (c) 1992, 1993
*      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.
*
* 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[] = "@(#)m.c 8.1 (Berkeley) 5/31/93";
#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;
}