contrib/nvi2/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 #include <sys/types.h>
  13 #include <sys/queue.h>
  14 #include <sys/time.h>
  15
  16 #include <bitstring.h>
  17 #include <limits.h>
  18 #include <stdio.h>
  19
  20 #include "../common/common.h"
  21 #include "vi.h"
  22
  23 /*
  24  * v_xchar -- [buffer] [count]x
  25  *      Deletes the character(s) on which the cursor sits.
  26  *
  27  * PUBLIC: int v_xchar(SCR *, VICMD *);
  28  */
  29 int
  30 v_xchar(SCR *sp, VICMD *vp)
  31 {
  32         size_t len;
  33         int isempty;
  34
  35         if (db_eget(sp, vp->m_start.lno, NULL, &len, &isempty)) {
  36                 if (isempty)
  37                         goto nodel;
  38                 return (1);
  39         }
  40         if (len == 0) {
  41 nodel:          msgq(sp, M_BERR, "206|No characters to delete");
  42                 return (1);
  43         }
  44
  45         /*
  46          * Delete from the cursor toward the end of line, w/o moving the
  47          * cursor.
  48          *
  49          * !!!
  50          * Note, "2x" at EOL isn't the same as "xx" because the left movement
  51          * of the cursor as part of the 'x' command isn't taken into account.
  52          * Historically correct.
  53          */
  54         if (F_ISSET(vp, VC_C1SET))
  55                 vp->m_stop.cno += vp->count - 1;
  56         if (vp->m_stop.cno >= len - 1) {
  57                 vp->m_stop.cno = len - 1;
  58                 vp->m_final.cno = vp->m_start.cno ? vp->m_start.cno - 1 : 0;
  59         } else
  60                 vp->m_final.cno = vp->m_start.cno;
  61
  62         if (cut(sp,
  63             F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
  64             &vp->m_start, &vp->m_stop, 0))
  65                 return (1);
  66         return (del(sp, &vp->m_start, &vp->m_stop, 0));
  67 }
  68
  69 /*
  70  * v_Xchar -- [buffer] [count]X
  71  *      Deletes the character(s) immediately before the current cursor
  72  *      position.
  73  *
  74  * PUBLIC: int v_Xchar(SCR *, VICMD *);
  75  */
  76 int
  77 v_Xchar(SCR *sp, VICMD *vp)
  78 {
  79         u_long cnt;
  80
  81         if (vp->m_start.cno == 0) {
  82                 v_sol(sp);
  83                 return (1);
  84         }
  85
  86         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  87         if (cnt >= vp->m_start.cno)
  88                 vp->m_start.cno = 0;
  89         else
  90                 vp->m_start.cno -= cnt;
  91         --vp->m_stop.cno;
  92         vp->m_final.cno = vp->m_start.cno;
  93
  94         if (cut(sp,
  95             F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
  96             &vp->m_start, &vp->m_stop, 0))
  97                 return (1);
  98         return (del(sp, &vp->m_start, &vp->m_stop, 0));
  99 }