src/cm.h

   1 /* Cursor motion calculation definitions for GNU Emacs
   2    Copyright (C) 1985, 1989 Free Software Foundation, Inc.
   3
   4 This file is part of GNU Emacs.
   5
   6 GNU Emacs is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 1, or (at your option)
   9 any later version.
  10
  11 GNU Emacs is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Emacs; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 /* Holds the minimum and maximum costs for the parametrized capabilities.  */
  21 struct parmcap
  22   {
  23     int mincost, maxcost;
  24   };
  25
  26 /* This structure holds everything needed to do cursor motion except the pad
  27    character (PC) and the output speed of the terminal (ospeed), which
  28    termcap wants in global variables.  */
  29
  30 struct cm
  31   {
  32     /* Cursor position.  -1 in *both* variables means the cursor
  33        position is unknown, in order to force absolute cursor motion. */
  34
  35     int cm_curY;                        /* Current row */
  36     int cm_curX;                        /* Current column */
  37
  38     /* Capabilities from termcap */
  39     char *cm_up;                /* up (up) */
  40     char *cm_down;              /* down (do) */
  41     char *cm_left;              /* left (le) */
  42     char *cm_right;             /* right (nd) */
  43     char *cm_home;              /* home (ho) */
  44     char *cm_cr;                /* carriage return (cr) */
  45     char *cm_ll;                /* last line (ll) */
  46     char *cm_tab;               /* tab (ta) */
  47     char *cm_backtab;           /* backtab (bt) */
  48     char *cm_abs;               /* absolute (cm) */
  49     char *cm_habs;              /* horizontal absolute (ch) */
  50     char *cm_vabs;              /* vertical absolute (cv) */
  51 #if 0
  52     char *cm_ds;                /* "don't send" string (ds) */
  53 #endif
  54     char *cm_multiup;           /* multiple up (UP) */
  55     char *cm_multidown;         /* multiple down (DO) */
  56     char *cm_multileft;         /* multiple left (LE) */
  57     char *cm_multiright;        /* multiple right (RI) */
  58     int cm_cols;                /* number of cols on screen (co) */
  59     int cm_rows;                /* number of rows on screen (li) */
  60     int cm_tabwidth;            /* tab width (it) */
  61     unsigned int cm_autowrap:1; /* autowrap flag (am) */
  62     unsigned int cm_magicwrap:1; /* VT-100: cursor stays in last col but
  63                                     will cm_wrap if next char is
  64                                     printing (xn) */
  65     unsigned int cm_usetabs:1;  /* if set, use tabs */
  66     unsigned int cm_losewrap:1; /* if reach right margin, forget cursor
  67                                    location */
  68     unsigned int cm_autolf:1;   /* \r performs a \r\n (rn) */
  69
  70     /* Parametrized capabilities.  This needs to be a struct since
  71        the costs are accessed through pointers.  */
  72
  73 #if 0
  74     struct parmcap cc_abs;      /* absolute (cm) */
  75     struct parmcap cc_habs;     /* horizontal absolute (ch) */
  76     struct parmcap cc_vabs;     /* vertical absolute (cv) */
  77     struct parmcap cc_multiup;  /* multiple up (UP) */
  78     struct parmcap cc_multidown; /* multiple down (DO) */
  79     struct parmcap cc_multileft; /* multiple left (LE) */
  80     struct parmcap cc_multiright; /* multiple right (RI) */
  81 #endif
  82
  83     /* Costs for the non-parametrized capabilities */
  84     int cc_up;                  /* cost for up */
  85     int cc_down;                /* etc. */
  86     int cc_left;
  87     int cc_right;
  88     int cc_home;
  89     int cc_cr;
  90     int cc_ll;
  91     int cc_tab;
  92     int cc_backtab;
  93     /* These are temporary, until the code is installed to use the
  94        struct parmcap fields above.  */
  95     int cc_abs;
  96     int cc_habs;
  97     int cc_vabs;
  98   };
  99
 100 extern struct cm Wcm;           /* Terminal capabilities */
 101 extern char PC;                 /* Pad character */
 102 extern short ospeed;            /* Output speed (from sg_ospeed) */
 103
 104 /* Shorthand */
 105 #ifndef NoCMShortHand
 106 #define curY            Wcm.cm_curY
 107 #define curX            Wcm.cm_curX
 108 #define Up              Wcm.cm_up
 109 #define Down            Wcm.cm_down
 110 #define Left            Wcm.cm_left
 111 #define Right           Wcm.cm_right
 112 #define Tab             Wcm.cm_tab
 113 #define BackTab         Wcm.cm_backtab
 114 #define TabWidth        Wcm.cm_tabwidth
 115 #define CR              Wcm.cm_cr
 116 #define Home            Wcm.cm_home
 117 #define LastLine        Wcm.cm_ll
 118 #define AbsPosition     Wcm.cm_abs
 119 #define ColPosition     Wcm.cm_habs
 120 #define RowPosition     Wcm.cm_vabs
 121 #define MultiUp         Wcm.cm_multiup
 122 #define MultiDown       Wcm.cm_multidown
 123 #define MultiLeft       Wcm.cm_multileft
 124 #define MultiRight      Wcm.cm_multiright
 125 #define AutoWrap        Wcm.cm_autowrap
 126 #define MagicWrap       Wcm.cm_magicwrap
 127 #define UseTabs         Wcm.cm_usetabs
 128 #define FrameRows       Wcm.cm_rows
 129 #define FrameCols       Wcm.cm_cols
 130
 131 #define UpCost          Wcm.cc_up
 132 #define DownCost        Wcm.cc_down
 133 #define LeftCost        Wcm.cc_left
 134 #define RightCost       Wcm.cc_right
 135 #define HomeCost        Wcm.cc_home
 136 #define CRCost          Wcm.cc_cr
 137 #define LastLineCost    Wcm.cc_ll
 138 #define TabCost         Wcm.cc_tab
 139 #define BackTabCost     Wcm.cc_backtab
 140 #define AbsPositionCost Wcm.cc_abs
 141 #define ColPositionCost Wcm.cc_habs
 142 #define RowPositionCost Wcm.cc_vabs
 143 #define MultiUpCost     Wcm.cc_multiup
 144 #define MultiDownCost   Wcm.cc_multidown
 145 #define MultiLeftCost   Wcm.cc_multileft
 146 #define MultiRightCost  Wcm.cc_multiright
 147 #endif
 148
 149 #define cmat(row,col)   (curY = (row), curX = (col))
 150 #define cmplus(n)                                       \
 151   {                                                     \
 152     if ((curX += (n)) >= FrameCols && !MagicWrap)       \
 153       {                                                 \
 154         if (Wcm.cm_losewrap) losecursor ();             \
 155         else if (AutoWrap) curX = 0, curY++;            \
 156         else curX--;                                    \
 157       }                                                 \
 158   }
 159
 160 #define losecursor()    (curX = -1, curY = -1)
 161
 162 extern int cost;
 163 extern int evalcost ();
 164
 165 extern void cmputc ();
 166 extern int cmcostinit ();
 167 extern int cmgoto ();
 168 extern int Wcm_clear ();
 169 extern int Wcm_init ();