src/cm.h

   1 /* Cursor motion calculation definitions for GNU Emacs
   2    Copyright (C) 1985, 1989, 2001-2018 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 3 of the License, or (at
   9 your option) 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.  If not, see <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef EMACS_CM_H
  20 #define EMACS_CM_H
  21
  22 /* Holds the minimum and maximum costs for the parameterized capabilities.  */
  23 struct parmcap
  24   {
  25     int mincost, maxcost;
  26   };
  27
  28 /* This structure holds everything needed to do cursor motion except the pad
  29    character (PC) and the output speed of the terminal (ospeed), which
  30    termcap wants in global variables.  */
  31
  32 struct cm
  33   {
  34     /* Cursor position.  -1 in *both* variables means the cursor
  35        position is unknown, in order to force absolute cursor motion. */
  36
  37     int cm_curY;                        /* Current row */
  38     int cm_curX;                        /* Current column */
  39
  40     /* Capabilities from termcap */
  41     const char *cm_up;          /* up (up) */
  42     const char *cm_down;        /* down (do) */
  43     const char *cm_left;        /* left (le) */
  44     const char *cm_right;       /* right (nd) */
  45     const char *cm_home;        /* home (ho) */
  46     const char *cm_cr;          /* carriage return (cr) */
  47     const char *cm_ll;          /* last line (ll) */
  48     const char *cm_tab;         /* tab (ta) */
  49     const char *cm_backtab;     /* backtab (bt) */
  50     char *cm_abs;               /* absolute (cm) */
  51     const char *cm_habs;        /* horizontal absolute (ch) */
  52     const char *cm_vabs;        /* vertical absolute (cv) */
  53 #if false
  54     const char *cm_ds;          /* "don't send" string (ds) */
  55 #endif
  56     const char *cm_multiup;     /* multiple up (UP) */
  57     const char *cm_multidown;   /* multiple down (DO) */
  58     const char *cm_multileft;   /* multiple left (LE) */
  59     const char *cm_multiright;  /* multiple right (RI) */
  60     int cm_cols;                /* number of cols on screen (co) */
  61     int cm_rows;                /* number of rows on screen (li) */
  62     int cm_tabwidth;            /* tab width (it) */
  63     bool_bf cm_autowrap : 1;    /* autowrap flag (am) */
  64     bool_bf cm_magicwrap : 1;   /* VT-100: cursor stays in last col but
  65                                     will cm_wrap if next char is
  66                                     printing (xn) */
  67     bool_bf cm_usetabs : 1;     /* if set, use tabs */
  68     bool_bf cm_losewrap : 1;    /* if reach right margin, forget cursor
  69                                    location */
  70     bool_bf cm_autolf : 1;      /* \r performs a \r\n (rn) */
  71
  72     /* Parameterized capabilities.  This needs to be a struct since
  73        the costs are accessed through pointers.  */
  74
  75 #if false
  76     struct parmcap cc_abs;      /* absolute (cm) */
  77     struct parmcap cc_habs;     /* horizontal absolute (ch) */
  78     struct parmcap cc_vabs;     /* vertical absolute (cv) */
  79     struct parmcap cc_multiup;  /* multiple up (UP) */
  80     struct parmcap cc_multidown; /* multiple down (DO) */
  81     struct parmcap cc_multileft; /* multiple left (LE) */
  82     struct parmcap cc_multiright; /* multiple right (RI) */
  83 #endif
  84
  85     /* Costs for the non-parameterized capabilities */
  86     int cc_up;                  /* cost for up */
  87     int cc_down;                /* etc. */
  88     int cc_left;
  89     int cc_right;
  90     int cc_home;
  91     int cc_cr;
  92     int cc_ll;
  93     int cc_tab;
  94     int cc_backtab;
  95     /* These are temporary, until the code is installed to use the
  96        struct parmcap fields above.  */
  97     int cc_abs;
  98     int cc_habs;
  99     int cc_vabs;
 100   };
 101
 102 /* Shorthand */
 103 #ifndef NoCMShortHand
 104 #define curY(tty)               (tty)->Wcm->cm_curY
 105 #define curX(tty)               (tty)->Wcm->cm_curX
 106 #define Up(tty)                 (tty)->Wcm->cm_up
 107 #define Down(tty)               (tty)->Wcm->cm_down
 108 #define Left(tty)               (tty)->Wcm->cm_left
 109 #define Right(tty)              (tty)->Wcm->cm_right
 110 #define Tab(tty)                (tty)->Wcm->cm_tab
 111 #define BackTab(tty)            (tty)->Wcm->cm_backtab
 112 #define TabWidth(tty)           (tty)->Wcm->cm_tabwidth
 113 #define CR(tty)                 (tty)->Wcm->cm_cr
 114 #define Home(tty)               (tty)->Wcm->cm_home
 115 #define LastLine(tty)           (tty)->Wcm->cm_ll
 116 #define AbsPosition(tty)        (tty)->Wcm->cm_abs
 117 #define ColPosition(tty)        (tty)->Wcm->cm_habs
 118 #define RowPosition(tty)        (tty)->Wcm->cm_vabs
 119 #define MultiUp(tty)            (tty)->Wcm->cm_multiup
 120 #define MultiDown(tty)          (tty)->Wcm->cm_multidown
 121 #define MultiLeft(tty)          (tty)->Wcm->cm_multileft
 122 #define MultiRight(tty)         (tty)->Wcm->cm_multiright
 123 #define AutoWrap(tty)           (tty)->Wcm->cm_autowrap
 124 #define MagicWrap(tty)          (tty)->Wcm->cm_magicwrap
 125 #define UseTabs(tty)            (tty)->Wcm->cm_usetabs
 126 #define FrameRows(tty)          (tty)->Wcm->cm_rows
 127 #define FrameCols(tty)          (tty)->Wcm->cm_cols
 128
 129 #define UpCost(tty)             (tty)->Wcm->cc_up
 130 #define DownCost(tty)           (tty)->Wcm->cc_down
 131 #define LeftCost(tty)           (tty)->Wcm->cc_left
 132 #define RightCost(tty)          (tty)->Wcm->cc_right
 133 #define HomeCost(tty)           (tty)->Wcm->cc_home
 134 #define CRCost(tty)             (tty)->Wcm->cc_cr
 135 #define LastLineCost(tty)       (tty)->Wcm->cc_ll
 136 #define TabCost(tty)            (tty)->Wcm->cc_tab
 137 #define BackTabCost(tty)        (tty)->Wcm->cc_backtab
 138 #define AbsPositionCost(tty)    (tty)->Wcm->cc_abs
 139 #define ColPositionCost(tty)    (tty)->Wcm->cc_habs
 140 #define RowPositionCost(tty)    (tty)->Wcm->cc_vabs
 141 #define MultiUpCost(tty)        (tty)->Wcm->cc_multiup
 142 #define MultiDownCost(tty)      (tty)->Wcm->cc_multidown
 143 #define MultiLeftCost(tty)      (tty)->Wcm->cc_multileft
 144 #define MultiRightCost(tty)     (tty)->Wcm->cc_multiright
 145 #endif  /* NoCMShortHand */
 146
 147 #define cmat(tty,row,col)       (curY(tty) = (row), curX(tty) = (col))
 148 #define cmplus(tty,n)                                               \
 149   {                                                                 \
 150     if ((curX (tty) += (n)) >= FrameCols (tty) && !MagicWrap (tty)) \
 151       {                                                             \
 152         if ((tty)->Wcm->cm_losewrap) losecursor (tty);              \
 153         else if (AutoWrap (tty)) curX (tty) = 0, curY (tty)++;      \
 154         else curX (tty)--;                                          \
 155       }                                                             \
 156   }
 157
 158 #define losecursor(tty)  (curX(tty) = -1, curY(tty) = -1)
 159
 160 extern int cost;
 161 extern int evalcost (int c);
 162
 163 #define emacs_tputs(tty, str, affcnt, putc) (current_tty = (tty), tputs (str, affcnt, putc))
 164
 165 extern struct tty_display_info *current_tty;
 166 extern void cmcheckmagic (struct tty_display_info *);
 167 extern int cmputc (int);
 168 extern void cmcostinit (struct tty_display_info *);
 169 extern void cmgoto (struct tty_display_info *, int, int);
 170 extern void Wcm_clear (struct tty_display_info *);
 171 extern int Wcm_init (struct tty_display_info *);
 172
 173 #endif /* EMACS_CM_H */