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 10.7 1996/03/06 19:54:32 bostic Exp $ (Berkeley) $Date: 1996/03/06 19:54:32 $";
  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 __P((SCR *, VICMD *));
  32  */
  33 int
  34 v_right(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 eol;
  44                 return (1);
  45         }
  46
  47         /* It's always illegal to move right on empty lines. */
  48         if (len == 0) {
  49 eol:            v_eol(sp, NULL);
  50                 return (1);
  51         }
  52
  53         /*
  54          * Non-motion commands move to the end of the range.  Delete and
  55          * yank stay at the start.  Ignore others.  Adjust the end of the
  56          * range for motion commands.
  57          *
  58          * !!!
  59          * Historically, "[cdsy]l" worked at the end of a line.  Also,
  60          * EOL is a count sink.
  61          */
  62         vp->m_stop.cno = vp->m_start.cno +
  63             (F_ISSET(vp, VC_C1SET) ? vp->count : 1);
  64         if (vp->m_start.cno == len - 1 && !ISMOTION(vp)) {
  65                 v_eol(sp, NULL);
  66                 return (1);
  67         }
  68         if (vp->m_stop.cno >= len) {
  69                 vp->m_stop.cno = len - 1;
  70                 vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
  71         } else if (ISMOTION(vp)) {
  72                 --vp->m_stop.cno;
  73                 vp->m_final = vp->m_start;
  74         } else
  75                 vp->m_final = vp->m_stop;
  76         return (0);
  77 }
  78
  79 /*
  80  * v_dollar -- [count]$
  81  *      Move to the last column.
  82  *
  83  * PUBLIC: int v_dollar __P((SCR *, VICMD *));
  84  */
  85 int
  86 v_dollar(sp, vp)
  87         SCR *sp;
  88         VICMD *vp;
  89 {
  90         size_t len;
  91         int isempty;
  92
  93         /*
  94          * !!!
  95          * A count moves down count - 1 rows, so, "3$" is the same as "2j$".
  96          */
  97         if ((F_ISSET(vp, VC_C1SET) ? vp->count : 1) != 1) {
  98                 /*
  99                  * !!!
 100                  * Historically, if the $ is a motion, and deleting from
 101                  * at or before the first non-blank of the line, it's a
 102                  * line motion, and the line motion flag is set.
 103                  */
 104                 vp->m_stop.cno = 0;
 105                 if (nonblank(sp, vp->m_start.lno, &vp->m_stop.cno))
 106                         return (1);
 107                 if (ISMOTION(vp) && vp->m_start.cno <= vp->m_stop.cno)
 108                         F_SET(vp, VM_LMODE);
 109
 110                 --vp->count;
 111                 if (v_down(sp, vp))
 112                         return (1);
 113         }
 114
 115         /*
 116          * !!!
 117          * Historically, it was illegal to use $ as a motion command on
 118          * an empty line.  Unfortunately, even though C was historically
 119          * aliased to c$, it (and not c$) was special cased to work on
 120          * empty lines.  Since we alias C to c$ too, we have a problem.
 121          * To fix it, we let c$ go through, on the assumption that it's
 122          * not a problem for it to work.
 123          */
 124         if (db_eget(sp, vp->m_stop.lno, NULL, &len, &isempty)) {
 125                 if (!isempty)
 126                         return (1);
 127                 len = 0;
 128         }
 129
 130         if (len == 0) {
 131                 if (ISMOTION(vp) && !ISCMD(vp->rkp, 'c')) {
 132                         v_eol(sp, NULL);
 133                         return (1);
 134                 }
 135                 return (0);
 136         }
 137
 138         /*
 139          * Non-motion commands move to the end of the range.  Delete
 140          * and yank stay at the start.  Ignore others.
 141          */
 142         vp->m_stop.cno = len ? len - 1 : 0;
 143         vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
 144         return (0);
 145 }