terminal.h

   1 /*
   2  * Internals of the Terminal structure, for those other modules
   3  * which need to look inside it. It would be nice if this could be
   4  * folded back into terminal.c in future, with an abstraction layer
   5  * to handle everything that other modules need to know about it;
   6  * but for the moment, this will do.
   7  */
   8
   9 #ifndef PUTTY_TERMINAL_H
  10 #define PUTTY_TERMINAL_H
  11
  12 #include "tree234.h"
  13
  14 struct beeptime {
  15     struct beeptime *next;
  16     unsigned long ticks;
  17 };
  18
  19 typedef struct {
  20     int y, x;
  21 } pos;
  22
  23 #ifdef OPTIMISE_SCROLL
  24 struct scrollregion {
  25     struct scrollregion *next;
  26     int topline; /* Top line of scroll region. */
  27     int botline; /* Bottom line of scroll region. */
  28     int lines; /* Number of lines to scroll by - +ve is forwards. */
  29 };
  30 #endif /* OPTIMISE_SCROLL */
  31
  32 typedef struct termchar termchar;
  33 typedef struct termline termline;
  34
  35 struct termchar {
  36     /*
  37      * Any code in terminal.c which definitely needs to be changed
  38      * when extra fields are added here is labelled with a comment
  39      * saying FULL-TERMCHAR.
  40      */
  41     unsigned long chr;
  42     unsigned long attr;
  43
  44     /*
  45      * The cc_next field is used to link multiple termchars
  46      * together into a list, so as to fit more than one character
  47      * into a character cell (Unicode combining characters).
  48      *
  49      * cc_next is a relative offset into the current array of
  50      * termchars. I.e. to advance to the next character in a list,
  51      * one does `tc += tc->next'.
  52      *
  53      * Zero means end of list.
  54      */
  55     int cc_next;
  56 };
  57
  58 struct termline {
  59     unsigned short lattr;
  60     int cols;                          /* number of real columns on the line */
  61     int size;                          /* number of allocated termchars
  62                                         * (cc-lists may make this > cols) */
  63     int temporary;                     /* TRUE if decompressed from scrollback */
  64     int cc_free;                       /* offset to first cc in free list */
  65     struct termchar *chars;
  66 };
  67
  68 struct bidi_cache_entry {
  69     int width;
  70     struct termchar *chars;
  71     int *forward, *backward;           /* the permutations of line positions */
  72 };
  73
  74 struct terminal_tag {
  75
  76     int compatibility_level;
  77
  78     tree234 *scrollback;               /* lines scrolled off top of screen */
  79     tree234 *screen;                   /* lines on primary screen */
  80     tree234 *alt_screen;               /* lines on alternate screen */
  81     int disptop;                       /* distance scrolled back (0 or -ve) */
  82     int tempsblines;                   /* number of lines of .scrollback that
  83                                           can be retrieved onto the terminal
  84                                           ("temporary scrollback") */
  85
  86     termline **disptext;               /* buffer of text on real screen */
  87     int dispcursx, dispcursy;          /* location of cursor on real screen */
  88     int curstype;                      /* type of cursor on real screen */
  89
  90 #define VBELL_TIMEOUT (TICKSPERSEC/10) /* visual bell lasts 1/10 sec */
  91
  92     struct beeptime *beephead, *beeptail;
  93     int nbeeps;
  94     int beep_overloaded;
  95     long lastbeep;
  96
  97 #define TTYPE termchar
  98 #define TSIZE (sizeof(TTYPE))
  99
 100 #ifdef OPTIMISE_SCROLL
 101     struct scrollregion *scrollhead, *scrolltail;
 102 #endif /* OPTIMISE_SCROLL */
 103
 104     int default_attr, curr_attr, save_attr;
 105     termchar basic_erase_char, erase_char;
 106
 107     bufchain inbuf;                    /* terminal input buffer */
 108     pos curs;                          /* cursor */
 109     pos savecurs;                      /* saved cursor position */
 110     int marg_t, marg_b;                /* scroll margins */
 111     int dec_om;                        /* DEC origin mode flag */
 112     int wrap, wrapnext;                /* wrap flags */
 113     int insert;                        /* insert-mode flag */
 114     int cset;                          /* 0 or 1: which char set */
 115     int save_cset, save_csattr;        /* saved with cursor position */
 116     int save_utf, save_wnext;          /* saved with cursor position */
 117     int rvideo;                        /* global reverse video flag */
 118     unsigned long rvbell_startpoint;   /* for ESC[?5hESC[?5l vbell */
 119     int cursor_on;                     /* cursor enabled flag */
 120     int reset_132;                     /* Flag ESC c resets to 80 cols */
 121     int use_bce;                       /* Use Background coloured erase */
 122     int cblinker;                      /* When blinking is the cursor on ? */
 123     int tblinker;                      /* When the blinking text is on */
 124     int blink_is_real;                 /* Actually blink blinking text */
 125     int term_echoing;                  /* Does terminal want local echo? */
 126     int term_editing;                  /* Does terminal want local edit? */
 127     int sco_acs, save_sco_acs;         /* CSI 10,11,12m -> OEM charset */
 128     int vt52_bold;                     /* Force bold on non-bold colours */
 129     int utf;                           /* Are we in toggleable UTF-8 mode? */
 130     int utf_state;                     /* Is there a pending UTF-8 character */
 131     int utf_char;                      /* and what is it so far. */
 132     int utf_size;                      /* The size of the UTF character. */
 133     int printing, only_printing;       /* Are we doing ANSI printing? */
 134     int print_state;                   /* state of print-end-sequence scan */
 135     bufchain printer_buf;              /* buffered data for printer */
 136     printer_job *print_job;
 137
 138     /* ESC 7 saved state for the alternate screen */
 139     pos alt_savecurs;
 140     int alt_save_attr;
 141     int alt_save_cset, alt_save_csattr;
 142     int alt_save_utf, alt_save_wnext;
 143     int alt_save_sco_acs;
 144
 145     int rows, cols, savelines;
 146     int has_focus;
 147     int in_vbell;
 148     long vbell_end;
 149     int app_cursor_keys, app_keypad_keys, vt52_mode;
 150     int repeat_off, cr_lf_return;
 151     int seen_disp_event;
 152     int big_cursor;
 153
 154     int xterm_mouse;                   /* send mouse messages to host */
 155     int mouse_is_down;                 /* used while tracking mouse buttons */
 156
 157     int cset_attr[2];
 158
 159 /*
 160  * Saved settings on the alternate screen.
 161  */
 162     int alt_x, alt_y, alt_om, alt_wrap, alt_wnext, alt_ins;
 163     int alt_cset, alt_sco_acs, alt_utf;
 164     int alt_t, alt_b;
 165     int alt_which;
 166     int alt_sblines; /* # of lines on alternate screen that should be used for scrollback. */
 167
 168 #define ARGS_MAX 32                    /* max # of esc sequence arguments */
 169 #define ARG_DEFAULT 0                  /* if an arg isn't specified */
 170 #define def(a,d) ( (a) == ARG_DEFAULT ? (d) : (a) )
 171     int esc_args[ARGS_MAX];
 172     int esc_nargs;
 173     int esc_query;
 174 #define ANSI(x,y)       ((x)+((y)<<8))
 175 #define ANSI_QUE(x)     ANSI(x,TRUE)
 176
 177 #define OSC_STR_MAX 2048
 178     int osc_strlen;
 179     char osc_string[OSC_STR_MAX + 1];
 180     int osc_w;
 181
 182     char id_string[1024];
 183
 184     unsigned char *tabs;
 185
 186     enum {
 187         TOPLEVEL,
 188         SEEN_ESC,
 189         SEEN_CSI,
 190         SEEN_OSC,
 191         SEEN_OSC_W,
 192
 193         DO_CTRLS,
 194
 195         SEEN_OSC_P,
 196         OSC_STRING, OSC_MAYBE_ST,
 197         VT52_ESC,
 198         VT52_Y1,
 199         VT52_Y2,
 200         VT52_FG,
 201         VT52_BG
 202     } termstate;
 203
 204     enum {
 205         NO_SELECTION, ABOUT_TO, DRAGGING, SELECTED
 206     } selstate;
 207     enum {
 208         LEXICOGRAPHIC, RECTANGULAR
 209     } seltype;
 210     enum {
 211         SM_CHAR, SM_WORD, SM_LINE
 212     } selmode;
 213     pos selstart, selend, selanchor;
 214
 215     short wordness[256];
 216
 217     /* Mask of attributes to pay attention to when painting. */
 218     int attr_mask;
 219
 220     wchar_t *paste_buffer;
 221     int paste_len, paste_pos, paste_hold;
 222     long last_paste;
 223
 224     void (*resize_fn)(void *, int, int);
 225     void *resize_ctx;
 226
 227     void *ldisc;
 228
 229     void *frontend;
 230
 231     void *logctx;
 232
 233     struct unicode_data *ucsdata;
 234
 235     /*
 236      * We maintain a full _copy_ of a Config structure here, not
 237      * merely a pointer to it. That way, when we're passed a new
 238      * one for reconfiguration, we can check the differences and
 239      * adjust the _current_ setting of (e.g.) auto wrap mode rather
 240      * than only the default.
 241      */
 242     Config cfg;
 243
 244     /*
 245      * from_backend calls term_out, but it can also be called from
 246      * the ldisc if the ldisc is called _within_ term_out. So we
 247      * have to guard against re-entrancy - if from_backend is
 248      * called recursively like this, it will simply add data to the
 249      * end of the buffer term_out is in the process of working
 250      * through.
 251      */
 252     int in_term_out;
 253
 254     /*
 255      * We schedule a window update shortly after receiving terminal
 256      * data. This tracks whether one is currently pending.
 257      */
 258     int window_update_pending;
 259     long next_update;
 260
 261     /*
 262      * Track pending blinks and tblinks.
 263      */
 264     int tblink_pending, cblink_pending;
 265     long next_tblink, next_cblink;
 266
 267     /*
 268      * These are buffers used by the bidi and Arabic shaping code.
 269      */
 270     termchar *ltemp;
 271     int ltemp_size;
 272     bidi_char *wcFrom, *wcTo;
 273     int wcFromTo_size;
 274     struct bidi_cache_entry *pre_bidi_cache, *post_bidi_cache;
 275     int bidi_cache_size;
 276 };
 277
 278 #define in_utf(term) ((term)->utf || (term)->ucsdata->line_codepage==CP_UTF8)
 279
 280 #endif