vi/v_delete.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_delete.c,v 10.10 2000/04/21 19:00:40 skimo Exp $ (Berkeley) $Date: 2000/04/21 19:00:40 $";
  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_delete -- [buffer][count]d[count]motion
  29  *             [buffer][count]D
  30  *      Delete a range of text.
  31  *
  32  * PUBLIC: int v_delete __P((SCR *, VICMD *));
  33  */
  34 int
  35 v_delete(sp, vp)
  36         SCR *sp;
  37         VICMD *vp;
  38 {
  39         db_recno_t nlines;
  40         size_t len;
  41         int lmode;
  42
  43         lmode = F_ISSET(vp, VM_LMODE) ? CUT_LINEMODE : 0;
  44
  45         /* Yank the lines. */
  46         if (cut(sp, F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
  47             &vp->m_start, &vp->m_stop,
  48             lmode | (F_ISSET(vp, VM_CUTREQ) ? CUT_NUMREQ : CUT_NUMOPT)))
  49                 return (1);
  50
  51         /* Delete the lines. */
  52         if (del(sp, &vp->m_start, &vp->m_stop, lmode))
  53                 return (1);
  54
  55         /*
  56          * Check for deletion of the entire file.  Try to check a close
  57          * by line so we don't go to the end of the file unnecessarily.
  58          */
  59         if (!db_exist(sp, vp->m_final.lno + 1)) {
  60                 if (db_last(sp, &nlines))
  61                         return (1);
  62                 if (nlines == 0) {
  63                         vp->m_final.lno = 1;
  64                         vp->m_final.cno = 0;
  65                         return (0);
  66                 }
  67         }
  68
  69         /*
  70          * One special correction, in case we've deleted the current line or
  71          * character.  We check it here instead of checking in every command
  72          * that can be a motion component.
  73          */
  74         if (db_get(sp, vp->m_final.lno, 0, NULL, &len)) {
  75                 if (db_get(sp, nlines, DBG_FATAL, NULL, &len))
  76                         return (1);
  77                 vp->m_final.lno = nlines;
  78         }
  79
  80         /*
  81          * !!!
  82          * Cursor movements, other than those caused by a line mode command
  83          * moving to another line, historically reset the relative position.
  84          *
  85          * This currently matches the check made in v_yank(), I'm hoping that
  86          * they should be consistent...
  87          */
  88         if (!F_ISSET(vp, VM_LMODE)) {
  89                 F_CLR(vp, VM_RCM_MASK);
  90                 F_SET(vp, VM_RCM_SET);
  91
  92                 /* Make sure the set cursor position exists. */
  93                 if (vp->m_final.cno >= len)
  94                         vp->m_final.cno = len ? len - 1 : 0;
  95         }
  96
  97         /*
  98          * !!!
  99          * The "dd" command moved to the first non-blank; "d<motion>"
 100          * didn't.
 101          */
 102         if (F_ISSET(vp, VM_LDOUBLE)) {
 103                 F_CLR(vp, VM_RCM_MASK);
 104                 F_SET(vp, VM_RCM_SETFNB);
 105         }
 106         return (0);
 107 }