contrib/nvi/vi/v_xchar.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[] = "@(#)v_xchar.c     10.9 (Berkeley) 10/23/96";
  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_xchar -- [buffer] [count]x
  29  *      Deletes the character(s) on which the cursor sits.
  30  *
  31  * PUBLIC: int v_xchar __P((SCR *, VICMD *));
  32  */
  33 int
  34 v_xchar(sp, vp)
  35         SCR *sp;
  36         VICMD *vp;
  37 {
  38         size_t len;
  39         int isempty;
  40
  41         if (db_eget(sp, vp->m_start.lno, NULL, &len, &isempty)) {
  42                 if (isempty)
  43                         goto nodel;
  44                 return (1);
  45         }
  46         if (len == 0) {
  47 nodel:          msgq(sp, M_BERR, "206|No characters to delete");
  48                 return (1);
  49         }
  50
  51         /*
  52          * Delete from the cursor toward the end of line, w/o moving the
  53          * cursor.
  54          *
  55          * !!!
  56          * Note, "2x" at EOL isn't the same as "xx" because the left movement
  57          * of the cursor as part of the 'x' command isn't taken into account.
  58          * Historically correct.
  59          */
  60         if (F_ISSET(vp, VC_C1SET))
  61                 vp->m_stop.cno += vp->count - 1;
  62         if (vp->m_stop.cno >= len - 1) {
  63                 vp->m_stop.cno = len - 1;
  64                 vp->m_final.cno = vp->m_start.cno ? vp->m_start.cno - 1 : 0;
  65         } else
  66                 vp->m_final.cno = vp->m_start.cno;
  67
  68         if (cut(sp,
  69             F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
  70             &vp->m_start, &vp->m_stop, 0))
  71                 return (1);
  72         return (del(sp, &vp->m_start, &vp->m_stop, 0));
  73 }
  74
  75 /*
  76  * v_Xchar -- [buffer] [count]X
  77  *      Deletes the character(s) immediately before the current cursor
  78  *      position.
  79  *
  80  * PUBLIC: int v_Xchar __P((SCR *, VICMD *));
  81  */
  82 int
  83 v_Xchar(sp, vp)
  84         SCR *sp;
  85         VICMD *vp;
  86 {
  87         u_long cnt;
  88
  89         if (vp->m_start.cno == 0) {
  90                 v_sol(sp);
  91                 return (1);
  92         }
  93
  94         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  95         if (cnt >= vp->m_start.cno)
  96                 vp->m_start.cno = 0;
  97         else
  98                 vp->m_start.cno -= cnt;
  99         --vp->m_stop.cno;
 100         vp->m_final.cno = vp->m_start.cno;
 101
 102         if (cut(sp,
 103             F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
 104             &vp->m_start, &vp->m_stop, 0))
 105                 return (1);
 106         return (del(sp, &vp->m_start, &vp->m_stop, 0));
 107 }