vi/v_left.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_left.c,v 10.8 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_left -- [count]^H, [count]h
  29  *      Move left by columns.
  30  *
  31  * PUBLIC: int v_left __P((SCR *, VICMD *));
  32  */
  33 int
  34 v_left(sp, vp)
  35         SCR *sp;
  36         VICMD *vp;
  37 {
  38         db_recno_t cnt;
  39
  40         /*
  41          * !!!
  42          * The ^H and h commands always failed in the first column.
  43          */
  44         if (vp->m_start.cno == 0) {
  45                 v_sol(sp);
  46                 return (1);
  47         }
  48
  49         /* Find the end of the range. */
  50         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  51         if (vp->m_start.cno > cnt)
  52                 vp->m_stop.cno = vp->m_start.cno - cnt;
  53         else
  54                 vp->m_stop.cno = 0;
  55
  56         /*
  57          * All commands move to the end of the range.  Motion commands
  58          * adjust the starting point to the character before the current
  59          * one.
  60          */
  61         if (ISMOTION(vp))
  62                 --vp->m_start.cno;
  63         vp->m_final = vp->m_stop;
  64         return (0);
  65 }
  66
  67 /*
  68  * v_cfirst -- [count]_
  69  *      Move to the first non-blank character in a line.
  70  *
  71  * PUBLIC: int v_cfirst __P((SCR *, VICMD *));
  72  */
  73 int
  74 v_cfirst(sp, vp)
  75         SCR *sp;
  76         VICMD *vp;
  77 {
  78         db_recno_t cnt, lno;
  79
  80         /*
  81          * !!!
  82          * If the _ is a motion component, it makes the command a line motion
  83          * e.g. "d_" deletes the line.  It also means that the cursor doesn't
  84          * move.
  85          *
  86          * The _ command never failed in the first column.
  87          */
  88         if (ISMOTION(vp))
  89                 F_SET(vp, VM_LMODE);
  90         /*
  91          * !!!
  92          * Historically a specified count makes _ move down count - 1
  93          * rows, so, "3_" is the same as "2j_".
  94          */
  95         cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
  96         if (cnt != 1) {
  97                 --vp->count;
  98                 return (v_down(sp, vp));
  99         }
 100
 101         /*
 102          * Move to the first non-blank.
 103          *
 104          * Can't just use RCM_SET_FNB, in case _ is used as the motion
 105          * component of another command.
 106          */
 107         vp->m_stop.cno = 0;
 108         if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
 109                 return (1);
 110
 111         /*
 112          * !!!
 113          * The _ command has to fail if the file is empty and we're doing
 114          * a delete.  If deleting line 1, and 0 is the first nonblank,
 115          * make the check.
 116          */
 117         if (vp->m_stop.lno == 1 &&
 118             vp->m_stop.cno == 0 && ISCMD(vp->rkp, 'd')) {
 119                 if (db_last(sp, &lno))
 120                         return (1);
 121                 if (lno == 0) {
 122                         v_sol(sp);
 123                         return (1);
 124                 }
 125         }
 126
 127         /*
 128          * Delete and non-motion commands move to the end of the range,
 129          * yank stays at the start.  Ignore others.
 130          */
 131         vp->m_final =
 132             ISMOTION(vp) && ISCMD(vp->rkp, 'y') ? vp->m_start : vp->m_stop;
 133         return (0);
 134 }
 135
 136 /*
 137  * v_first -- ^
 138  *      Move to the first non-blank character in this line.
 139  *
 140  * PUBLIC: int v_first __P((SCR *, VICMD *));
 141  */
 142 int
 143 v_first(sp, vp)
 144         SCR *sp;
 145         VICMD *vp;
 146 {
 147         /*
 148          * !!!
 149          * Yielding to none in our quest for compatibility with every
 150          * historical blemish of vi, no matter how strange it might be,
 151          * we permit the user to enter a count and then ignore it.
 152          */
 153
 154         /*
 155          * Move to the first non-blank.
 156          *
 157          * Can't just use RCM_SET_FNB, in case ^ is used as the motion
 158          * component of another command.
 159          */
 160         vp->m_stop.cno = 0;
 161         if (nonblank(sp, vp->m_stop.lno, &vp->m_stop.cno))
 162                 return (1);
 163
 164         /*
 165          * !!!
 166          * The ^ command succeeded if used as a command when the cursor was
 167          * on the first non-blank in the line, but failed if used as a motion
 168          * component in the same situation.
 169          */
 170         if (ISMOTION(vp) && vp->m_start.cno == vp->m_stop.cno) {
 171                 v_sol(sp);
 172                 return (1);
 173         }
 174
 175         /*
 176          * If moving right, non-motion commands move to the end of the range.
 177          * Delete and yank stay at the start.  Motion commands adjust the
 178          * ending point to the character before the current ending charcter.
 179          *
 180          * If moving left, all commands move to the end of the range.  Motion
 181          * commands adjust the starting point to the character before the
 182          * current starting character.
 183          */
 184         if (vp->m_start.cno < vp->m_stop.cno)
 185                 if (ISMOTION(vp)) {
 186                         --vp->m_stop.cno;
 187                         vp->m_final = vp->m_start;
 188                 } else
 189                         vp->m_final = vp->m_stop;
 190         else {
 191                 if (ISMOTION(vp))
 192                         --vp->m_start.cno;
 193                 vp->m_final = vp->m_stop;
 194         }
 195         return (0);
 196 }
 197
 198 /*
 199  * v_ncol -- [count]|
 200  *      Move to column count or the first column on this line.  If the
 201  *      requested column is past EOL, move to EOL.  The nasty part is
 202  *      that we have to know character column widths to make this work.
 203  *
 204  * PUBLIC: int v_ncol __P((SCR *, VICMD *));
 205  */
 206 int
 207 v_ncol(sp, vp)
 208         SCR *sp;
 209         VICMD *vp;
 210 {
 211         if (F_ISSET(vp, VC_C1SET) && vp->count > 1) {
 212                 --vp->count;
 213                 vp->m_stop.cno =
 214                     vs_colpos(sp, vp->m_start.lno, (size_t)vp->count);
 215                 /*
 216                  * !!!
 217                  * The | command succeeded if used as a command and the cursor
 218                  * didn't move, but failed if used as a motion component in the
 219                  * same situation.
 220                  */
 221                 if (ISMOTION(vp) && vp->m_stop.cno == vp->m_start.cno) {
 222                         v_nomove(sp);
 223                         return (1);
 224                 }
 225         } else {
 226                 /*
 227                  * !!!
 228                  * The | command succeeded if used as a command in column 0
 229                  * without a count, but failed if used as a motion component
 230                  * in the same situation.
 231                  */
 232                 if (ISMOTION(vp) && vp->m_start.cno == 0) {
 233                         v_sol(sp);
 234                         return (1);
 235                 }
 236                 vp->m_stop.cno = 0;
 237         }
 238
 239         /*
 240          * If moving right, non-motion commands move to the end of the range.
 241          * Delete and yank stay at the start.  Motion commands adjust the
 242          * ending point to the character before the current ending charcter.
 243          *
 244          * If moving left, all commands move to the end of the range.  Motion
 245          * commands adjust the starting point to the character before the
 246          * current starting character.
 247          */
 248         if (vp->m_start.cno < vp->m_stop.cno)
 249                 if (ISMOTION(vp)) {
 250                         --vp->m_stop.cno;
 251                         vp->m_final = vp->m_start;
 252                 } else
 253                         vp->m_final = vp->m_stop;
 254         else {
 255                 if (ISMOTION(vp))
 256                         --vp->m_start.cno;
 257                 vp->m_final = vp->m_stop;
 258         }
 259         return (0);
 260 }
 261
 262 /*
 263  * v_zero -- 0
 264  *      Move to the first column on this line.
 265  *
 266  * PUBLIC: int v_zero __P((SCR *, VICMD *));
 267  */
 268 int
 269 v_zero(sp, vp)
 270         SCR *sp;
 271         VICMD *vp;
 272 {
 273         /*
 274          * !!!
 275          * The 0 command succeeded if used as a command in the first column
 276          * but failed if used as a motion component in the same situation.
 277          */
 278         if (ISMOTION(vp) && vp->m_start.cno == 0) {
 279                 v_sol(sp);
 280                 return (1);
 281         }
 282
 283         /*
 284          * All commands move to the end of the range.  Motion commands
 285          * adjust the starting point to the character before the current
 286          * one.
 287          */
 288         vp->m_stop.cno = 0;
 289         if (ISMOTION(vp))
 290                 --vp->m_start.cno;
 291         vp->m_final = vp->m_stop;
 292         return (0);
 293 }