vi/v_yank.c

   1 /*-
   2  * Copyright (c) 1992, 1993, 1994
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Copyright (c) 1992, 1993, 1994, 1995, 1996
   5  *      Keith Bostic.  All rights reserved.
   6  *
   7  * See the LICENSE file for redistribution information.
   8  */
   9
  10 #include "config.h"
  11
  12 #ifndef lint
  13 static const char sccsid[] = "$Id: v_yank.c,v 10.10 2001/06/25 15:19:36 skimo Exp $ (Berkeley) $Date: 2001/06/25 15:19:36 $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <limits.h>
  22 #include <stdio.h>
  23
  24 #include "../common/common.h"
  25 #include "vi.h"
  26
  27 /*
  28  * v_yank -- [buffer][count]y[count][motion]
  29  *           [buffer][count]Y
  30  *      Yank text (or lines of text) into a cut buffer.
  31  *
  32  * !!!
  33  * Historic vi moved the cursor to the from MARK if it was before the current
  34  * cursor and on a different line, e.g., "yk" moves the cursor but "yj" and
  35  * "yl" do not.  Unfortunately, it's too late to change this now.  Matching
  36  * the historic semantics isn't easy.  The line number was always changed and
  37  * column movement was usually relative.  However, "y'a" moved the cursor to
  38  * the first non-blank of the line marked by a, while "y`a" moved the cursor
  39  * to the line and column marked by a.  Hopefully, the motion component code
  40  * got it right...   Unlike delete, we make no adjustments here.
  41  *
  42  * PUBLIC: int v_yank __P((SCR *, VICMD *));
  43  */
  44 int
  45 v_yank(SCR *sp, VICMD *vp)
  46 {
  47         size_t len;
  48
  49         if (cut(sp,
  50             F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL, &vp->m_start,
  51             &vp->m_stop, F_ISSET(vp, VM_LMODE) ? CUT_LINEMODE : 0))
  52                 return (1);
  53         sp->rptlines[L_YANKED] += (vp->m_stop.lno - vp->m_start.lno) + 1;
  54
  55         /*
  56          * One special correction, in case we've deleted the current line or
  57          * character.  We check it here instead of checking in every command
  58          * that can be a motion component.
  59          */
  60         if (db_get(sp, vp->m_final.lno, DBG_FATAL, NULL, &len))
  61                 return (1);
  62
  63         /*
  64          * !!!
  65          * Cursor movements, other than those caused by a line mode command
  66          * moving to another line, historically reset the relative position.
  67          *
  68          * This currently matches the check made in v_delete(), I'm hoping
  69          * that they should be consistent...
  70          */
  71         if (!F_ISSET(vp, VM_LMODE)) {
  72                 F_CLR(vp, VM_RCM_MASK);
  73                 F_SET(vp, VM_RCM_SET);
  74
  75                 /* Make sure the set cursor position exists. */
  76                 if (vp->m_final.cno >= len)
  77                         vp->m_final.cno = len ? len - 1 : 0;
  78         }
  79         return (0);
  80 }