contrib/nvi2/vi/v_right.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_right.c,v 10.8 2001/06/25 15:19:34 skimo Exp $";
  14 #endif /* not lint */
  15
  16 #include <sys/types.h>
  17 #include <sys/queue.h>
  18 #include <sys/time.h>
  19
  20 #include <bitstring.h>
  21 #include <limits.h>
  22 #include <stdio.h>
  23
  24 #include "../common/common.h"
  25 #include "vi.h"
  26
  27 /*
  28  * v_right -- [count]' ', [count]l
  29  *      Move right by columns.
  30  *
  31  * PUBLIC: int v_right(SCR *, VICMD *);
  32  */
  33 int
  34 v_right(SCR *sp, VICMD *vp)
  35 {
  36         size_t len;
  37         int isempty;
  38
  39         if (db_eget(sp, vp->m_start.lno, NULL, &len, &isempty)) {
  40                 if (isempty)
  41                         goto eol;
  42                 return (1);
  43         }
  44
  45         /* It's always illegal to move right on empty lines. */
  46         if (len == 0) {
  47 eol:            v_eol(sp, NULL);
  48                 return (1);
  49         }
  50
  51         /*
  52          * Non-motion commands move to the end of the range.  Delete and
  53          * yank stay at the start.  Ignore others.  Adjust the end of the
  54          * range for motion commands.
  55          *
  56          * !!!
  57          * Historically, "[cdsy]l" worked at the end of a line.  Also,
  58          * EOL is a count sink.
  59          */
  60         vp->m_stop.cno = vp->m_start.cno +
  61             (F_ISSET(vp, VC_C1SET) ? vp->count : 1);
  62         if (vp->m_start.cno == len - 1 && !ISMOTION(vp)) {
  63                 v_eol(sp, NULL);
  64                 return (1);
  65         }
  66         if (vp->m_stop.cno >= len) {
  67                 vp->m_stop.cno = len - 1;
  68                 vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
  69         } else if (ISMOTION(vp)) {
  70                 --vp->m_stop.cno;
  71                 vp->m_final = vp->m_start;
  72         } else
  73                 vp->m_final = vp->m_stop;
  74         return (0);
  75 }
  76
  77 /*
  78  * v_dollar -- [count]$
  79  *      Move to the last column.
  80  *
  81  * PUBLIC: int v_dollar(SCR *, VICMD *);
  82  */
  83 int
  84 v_dollar(SCR *sp, VICMD *vp)
  85 {
  86         size_t len;
  87         int isempty;
  88
  89         /*
  90          * !!!
  91          * A count moves down count - 1 rows, so, "3$" is the same as "2j$".
  92          */
  93         if ((F_ISSET(vp, VC_C1SET) ? vp->count : 1) != 1) {
  94                 /*
  95                  * !!!
  96                  * Historically, if the $ is a motion, and deleting from
  97                  * at or before the first non-blank of the line, it's a
  98                  * line motion, and the line motion flag is set.
  99                  */
 100                 vp->m_stop.cno = 0;
 101                 if (nonblank(sp, vp->m_start.lno, &vp->m_stop.cno))
 102                         return (1);
 103                 if (ISMOTION(vp) && vp->m_start.cno <= vp->m_stop.cno)
 104                         F_SET(vp, VM_LMODE);
 105
 106                 --vp->count;
 107                 if (v_down(sp, vp))
 108                         return (1);
 109         }
 110
 111         /*
 112          * !!!
 113          * Historically, it was illegal to use $ as a motion command on
 114          * an empty line.  Unfortunately, even though C was historically
 115          * aliased to c$, it (and not c$) was special cased to work on
 116          * empty lines.  Since we alias C to c$ too, we have a problem.
 117          * To fix it, we let c$ go through, on the assumption that it's
 118          * not a problem for it to work.
 119          */
 120         if (db_eget(sp, vp->m_stop.lno, NULL, &len, &isempty)) {
 121                 if (!isempty)
 122                         return (1);
 123                 len = 0;
 124         }
 125
 126         if (len == 0) {
 127                 if (ISMOTION(vp) && !ISCMD(vp->rkp, 'c')) {
 128                         v_eol(sp, NULL);
 129                         return (1);
 130                 }
 131                 return (0);
 132         }
 133
 134         /*
 135          * Non-motion commands move to the end of the range.  Delete
 136          * and yank stay at the start.  Ignore others.
 137          */
 138         vp->m_stop.cno = len ? len - 1 : 0;
 139         vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
 140         return (0);
 141 }