vi/v_z.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_z.c,v 10.11 2000/04/21 19:00:41 skimo Exp $ (Berkeley) $Date: 2000/04/21 19:00:41 $";
  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_z -- [count]z[count][-.+^<CR>]
  29  *      Move the screen.
  30  *
  31  * PUBLIC: int v_z __P((SCR *, VICMD *));
  32  */
  33 int
  34 v_z(sp, vp)
  35         SCR *sp;
  36         VICMD *vp;
  37 {
  38         db_recno_t lno;
  39         u_int value;
  40
  41         /*
  42          * The first count is the line to use.  If the value doesn't
  43          * exist, use the last line.
  44          */
  45         if (F_ISSET(vp, VC_C1SET)) {
  46                 lno = vp->count;
  47                 if (!db_exist(sp, lno) && db_last(sp, &lno))
  48                         return (1);
  49         } else
  50                 lno = vp->m_start.lno;
  51
  52         /* Set default return cursor line. */
  53         vp->m_final.lno = lno;
  54         vp->m_final.cno = vp->m_start.cno;
  55
  56         /*
  57          * The second count is the displayed window size, i.e. the 'z' command
  58          * is another way to get artificially small windows.  Note, you can't
  59          * grow beyond the size of the window.
  60          *
  61          * !!!
  62          * A window size of 0 was historically allowed, and simply ignored.
  63          * This could be much more simply done by modifying the value of the
  64          * O_WINDOW option, but that's not how it worked historically.
  65          */
  66         if (F_ISSET(vp, VC_C2SET) && vp->count2 != 0) {
  67                 if (vp->count2 > O_VAL(sp, O_WINDOW))
  68                         vp->count2 = O_VAL(sp, O_WINDOW);
  69                 if (vs_crel(sp, vp->count2))
  70                         return (1);
  71         }
  72
  73         switch (vp->character) {
  74         case '-':               /* Put the line at the bottom. */
  75                 if (vs_sm_fill(sp, lno, P_BOTTOM))
  76                         return (1);
  77                 break;
  78         case '.':               /* Put the line in the middle. */
  79                 if (vs_sm_fill(sp, lno, P_MIDDLE))
  80                         return (1);
  81                 break;
  82         case '+':
  83                 /*
  84                  * If the user specified a line number, put that line at the
  85                  * top and move the cursor to it.  Otherwise, scroll forward
  86                  * a screen from the current screen.
  87                  */
  88                 if (F_ISSET(vp, VC_C1SET)) {
  89                         if (vs_sm_fill(sp, lno, P_TOP))
  90                                 return (1);
  91                         if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
  92                                 return (1);
  93                 } else
  94                         if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_PLUS))
  95                                 return (1);
  96                 break;
  97         case '^':
  98                 /*
  99                  * If the user specified a line number, put that line at the
 100                  * bottom, move the cursor to it, and then display the screen
 101                  * before that one.  Otherwise, scroll backward a screen from
 102                  * the current screen.
 103                  *
 104                  * !!!
 105                  * Note, we match the off-by-one characteristics of historic
 106                  * vi, here.
 107                  */
 108                 if (F_ISSET(vp, VC_C1SET)) {
 109                         if (vs_sm_fill(sp, lno, P_BOTTOM))
 110                                 return (1);
 111                         if (vs_sm_position(sp, &vp->m_final, 0, P_TOP))
 112                                 return (1);
 113                         if (vs_sm_fill(sp, vp->m_final.lno, P_BOTTOM))
 114                                 return (1);
 115                 } else
 116                         if (vs_sm_scroll(sp, &vp->m_final, sp->t_rows, Z_CARAT))
 117                                 return (1);
 118                 break;
 119         default:                /* Put the line at the top for <cr>. */
 120                 value = KEY_VAL(sp, vp->character);
 121                 if (value != K_CR && value != K_NL) {
 122                         v_emsg(sp, vp->kp->usage, VIM_USAGE);
 123                         return (1);
 124                 }
 125                 if (vs_sm_fill(sp, lno, P_TOP))
 126                         return (1);
 127                 break;
 128         }
 129         return (0);
 130 }
 131
 132 /*
 133  * vs_crel --
 134  *      Change the relative size of the current screen.
 135  *
 136  * PUBLIC: int vs_crel __P((SCR *, long));
 137  */
 138 int
 139 vs_crel(sp, count)
 140         SCR *sp;
 141         long count;
 142 {
 143         sp->t_minrows = sp->t_rows = count;
 144         if (sp->t_rows > sp->rows - 1)
 145                 sp->t_minrows = sp->t_rows = sp->rows - 1;
 146         TMAP = HMAP + (sp->t_rows - 1);
 147         F_SET(sp, SC_SCR_REDRAW);
 148         return (0);
 149 }