gdb/tui/tuiIO.c

   1
   2 /*
   3    ** This module contains functions to support i/o in the TUI
   4  */
   5
   6
   7 #include <stdio.h>
   8 #include "defs.h"
   9 #include "terminal.h"
  10 #include "tui.h"
  11 #include "tuiData.h"
  12 #include "tuiIO.h"
  13 #include "tuiCommand.h"
  14 #include "tuiWin.h"
  15
  16 #ifdef ANSI_PROTOTYPES
  17 #include <stdarg.h>
  18 #else
  19 #include <varargs.h>
  20 #endif
  21
  22 /* The Solaris header files seem to provide no declaration for this at
  23    all when __STDC__ is defined.  This shouldn't conflict with
  24    anything.  */
  25 extern char *tgoto ();
  26
  27 int insert_mode = 0;
  28
  29 /********************************************
  30 **       LOCAL STATIC FORWARD DECLS        **
  31 ********************************************/
  32 static void _updateCommandInfo PARAMS ((int));
  33 static unsigned int _tuiHandleResizeDuringIO PARAMS ((unsigned int));
  34
  35
  36 /*********************************************************************************
  37 **                              PUBLIC FUNCTIONS                                **
  38 *********************************************************************************/
  39
  40 /*
  41    ** tuiPuts_unfiltered().
  42    **        Function to put a string to the command window
  43    **              When running in TUI mode, this is the "hook"
  44    **              for fputs_unfiltered(). That is, all debugger
  45    **              output eventually makes it's way to the bottom-level
  46    **              routine fputs_unfiltered (main.c), which (in TUI
  47    **              mode), calls tuiPuts_unfiltered().
  48  */
  49 void
  50 #ifdef __STDC__
  51 tuiPuts_unfiltered (
  52                      const char *string,
  53                      GDB_FILE * stream)
  54 #else
  55 tuiPuts_unfiltered (string, stream)
  56      char *string;
  57      GDB_FILE *stream;
  58 #endif
  59 {
  60   int len = strlen (string);
  61   int i, linech;
  62
  63   for (i = 0; i < len; i++)
  64     {
  65       if (string[i] == '\n' || string[i] == '\r')
  66         m_tuiStartNewLine;
  67       else
  68         {
  69           if ((cmdWin->detail.commandInfo.curch + 1) > cmdWin->generic.width)
  70             m_tuiStartNewLine;
  71
  72           if (insert_mode)
  73             {
  74               mvwinsch (cmdWin->generic.handle,
  75                         cmdWin->detail.commandInfo.curLine,
  76                         cmdWin->detail.commandInfo.curch++,
  77                         string[i]);
  78               wmove (cmdWin->generic.handle,
  79                      cmdWin->detail.commandInfo.curLine,
  80                      cmdWin->detail.commandInfo.curch);
  81             }
  82           else
  83             mvwaddch (cmdWin->generic.handle,
  84                       cmdWin->detail.commandInfo.curLine,
  85                       cmdWin->detail.commandInfo.curch++,
  86                       string[i]);
  87         }
  88     }
  89   tuiRefreshWin (&cmdWin->generic);
  90
  91   return;
  92 }                               /* tuiPuts_unfiltered */
  93
  94 /* A cover routine for tputs().
  95  * tputs() is called from the readline package to put
  96  * out strings representing cursor positioning.
  97  * In TUI mode (non-XDB-style), tui_tputs() is called instead.
  98  *
  99  * The reason we need to hook tputs() is:
 100  * Since the output is going to curses and not to
 101  * a raw terminal, we need to intercept these special
 102  * sequences, and handle them them here.
 103  *
 104  * This function seems to be correctly handling all sequences
 105  * aimed at hpterm's, but there is additional work to do
 106  * for xterm's and dtterm's. I abandoned further work on this
 107  * in favor of "XDB style". In "XDB style", the command region
 108  * looks like terminal, not a curses window, and this routine
 109  * is not called. - RT
 110  */
 111 void
 112 tui_tputs (str, affcnt, putfunc)
 113      char *str;
 114      int affcnt;
 115      int (*putfunc) PARAMS ((int));
 116 {
 117   extern char *rl_prompt;       /* the prompt string */
 118
 119   /* This set of globals are defined and initialized
 120    * by the readline package.
 121    *
 122    * Note we're assuming tui_tputs() is being called
 123    * by the readline package. That's because we're recognizing
 124    * that a given string is being passed by
 125    * matching the string address against readline's
 126    * term_<whatever> global. To make this more general,
 127    * we'd have to actually recognize the termcap sequence
 128    * inside the string (more work than I want to do). - RT
 129    *
 130    * We don't see or need to handle every one of these here;
 131    * this is just the full list defined in readline/readline.c
 132    */
 133   extern char *term_backspace;
 134   extern char *term_clreol;
 135   extern char *term_clrpag;
 136   extern char *term_cr;
 137   extern char *term_dc;
 138   extern char *term_ei;
 139   extern char *term_goto;
 140   extern char *term_ic;
 141   extern char *term_im;
 142   extern char *term_mm;
 143   extern char *term_mo;
 144   extern char *term_up;
 145   extern char *term_scroll_region;
 146   extern char *term_memory_lock;
 147   extern char *term_memory_unlock;
 148   extern char *term_cursor_move;
 149   extern char *visible_bell;
 150
 151   /* Sanity check - if not TUI, just call tputs() */
 152   if (!tui_version)
 153     tputs (str, affcnt, putfunc);
 154
 155   /* The strings we special-case are handled first */
 156
 157   if (str == term_backspace)
 158     {
 159       /* Backspace. */
 160
 161       /* We see this on an emacs control-B.
 162          * I.e., it's like the left-arrow key (not like the backspace key).
 163          * The effect that readline wants when it transmits this
 164          * character to us is simply to back up one character
 165          * (but not to write a space over the old character).
 166        */
 167
 168       _updateCommandInfo (-1);
 169       wmove (cmdWin->generic.handle,
 170              cmdWin->detail.commandInfo.curLine,
 171              cmdWin->detail.commandInfo.curch);
 172       wrefresh (cmdWin->generic.handle);
 173
 174     }
 175   else if (str == term_clreol)
 176     {
 177
 178       /* Clear to end of line. */
 179       wclrtoeol (cmdWin->generic.handle);
 180       wrefresh (cmdWin->generic.handle);
 181
 182     }
 183   else if (str == term_cr)
 184     {
 185
 186       /* Carriage return */
 187       _updateCommandInfo (-cmdWin->detail.commandInfo.curch);
 188       wmove (cmdWin->generic.handle,
 189              cmdWin->detail.commandInfo.curLine,
 190              0 /* readline will rewrite the prompt from 0 */ );
 191       wrefresh (cmdWin->generic.handle);
 192
 193     }
 194   else if (str == term_goto)
 195     {
 196
 197       /* This is actually a tgoto() specifying a character position,
 198          * followed by either a term_IC/term_DC which [I think] means
 199          * insert/delete one character at that position.
 200          * There are complications with this one - need to either
 201          * extract the position from the string, or have a backdoor
 202          * means of communicating it from ../readline/display.c.
 203          * So this one is not yet implemented.
 204          * Not doing it seems to have no ill effects on command-line-editing
 205          * that I've noticed so far. - RT
 206        */
 207
 208     }
 209   else if (str == term_dc)
 210     {
 211
 212       /* Delete character at current cursor position */
 213       wdelch (cmdWin->generic.handle);
 214       wrefresh (cmdWin->generic.handle);
 215
 216     }
 217   else if (str == term_im)
 218     {
 219
 220       /* Turn on insert mode. */
 221       insert_mode = 1;
 222
 223     }
 224   else if (str == term_ei)
 225     {
 226
 227       /* Turn off insert mode. */
 228       insert_mode = 0;
 229
 230       /* Strings we know about but don't handle
 231          * specially here are just passed along to tputs().
 232          *
 233          * These are not handled because (as far as I can tell)
 234          * they are not actually emitted by the readline package
 235          * in the course of doing command-line editing. Some of them
 236          * theoretically could be used in the future, in which case we'd
 237          * need to handle them.
 238        */
 239     }
 240   else if (str == term_ic ||    /* insert character */
 241            str == term_cursor_move ||   /* cursor move */
 242            str == term_clrpag ||        /* clear page */
 243            str == term_mm ||    /* turn on meta key */
 244            str == term_mo ||    /* turn off meta key */
 245            str == term_up ||    /* up one line (not expected) */
 246            str == term_scroll_region ||         /* set scroll region */
 247            str == term_memory_lock ||   /* lock screen above cursor */
 248            str == term_memory_unlock ||         /* unlock screen above cursor */
 249            str == visible_bell)
 250     {                           /* flash screen */
 251       tputs (str, affcnt, putfunc);
 252     }
 253   else
 254     {                           /* something else */
 255       tputs (str, affcnt, putfunc);
 256     }
 257 }                               /* tui_tputs */
 258
 259
 260 /*
 261    ** tui_vwgetch()
 262    **        Wrapper around wgetch with the window in a va_list
 263  */
 264 unsigned int
 265 #ifdef __STDC__
 266 tui_vwgetch (va_list args)
 267 #else
 268 tui_vwgetch (args)
 269      va_list args;
 270 #endif
 271 {
 272   unsigned int ch;
 273   WINDOW *window;
 274
 275   window = va_arg (args, WINDOW *);
 276
 277   return ((unsigned int) wgetch (window));
 278 }                               /* tui_vwgetch */
 279
 280
 281 /*
 282    ** tui_vread()
 283    **   Wrapper around read() with paramets in a va_list
 284  */
 285 unsigned int
 286 #ifdef __STDC__
 287 tui_vread (va_list args)
 288 #else
 289 tui_vread (args)
 290      va_list args;
 291 #endif
 292 {
 293   int result = 0;
 294   int filedes = va_arg (args, int);
 295   char *buf = va_arg (args, char *);
 296   int nbytes = va_arg (args, int);
 297
 298   result = read (filedes, buf, nbytes);
 299
 300   return result;
 301 }                               /* tui_vread() */
 302
 303 /*
 304    ** tuiRead()
 305    **    Function to perform a read() catching resize events
 306  */
 307 int
 308 #ifdef __STDC__
 309 tuiRead (
 310           int filedes,
 311           char *buf,
 312           int nbytes)
 313 #else
 314 tuiRead (filedes, buf, nbytes)
 315      int filedes;
 316      char *buf;
 317      int nbytes;
 318 #endif
 319 {
 320   int result = 0;
 321
 322   result = (int) vcatch_errors ((OpaqueFuncPtr) tui_vread, filedes, buf, nbytes);
 323   *buf = _tuiHandleResizeDuringIO (*buf);
 324
 325   return result;
 326 }                               /* tuiRead */
 327
 328
 329 /*
 330    ** tuiGetc().
 331    **        Get a character from the command window.
 332    **           This is called from the readline package,
 333    **              that is, we have:
 334    **                tuiGetc() [here], called from
 335    **                readline code [in ../readline/], called from
 336    **                command_line_input() in top.c
 337  */
 338 unsigned int
 339 #ifdef __STDC__
 340 tuiGetc (void)
 341 #else
 342 tuiGetc ()
 343 #endif
 344 {
 345   unsigned int ch;
 346   extern char *rl_prompt;
 347   extern char *rl_line_buffer;
 348   extern int rl_point;
 349
 350   /* Call the curses routine that reads one character */
 351 #ifndef COMMENT
 352   ch = (unsigned int) vcatch_errors ((OpaqueFuncPtr) tui_vwgetch,
 353                                      cmdWin->generic.handle);
 354 #else
 355   ch = wgetch (cmdWin->generic.handle);
 356 #endif
 357   ch = _tuiHandleResizeDuringIO (ch);
 358
 359   if (m_isCommandChar (ch))
 360     {                           /* Handle prev/next/up/down here */
 361       tuiTermSetup (0);
 362       ch = tuiDispatchCtrlChar (ch);
 363       cmdWin->detail.commandInfo.curch = strlen (rl_prompt) + rl_point;
 364       tuiTermUnsetup (0, cmdWin->detail.commandInfo.curch);
 365     }
 366   if (ch == '\n' || ch == '\r' || ch == '\f')
 367     cmdWin->detail.commandInfo.curch = 0;
 368   else
 369     tuiIncrCommandCharCountBy (1);
 370
 371   return ch;
 372 }                               /* tuiGetc */
 373
 374
 375 /*
 376    ** tuiBufferGetc().
 377  */
 378 /*elz: this function reads a line of input from the user and
 379    puts it in a static buffer. Subsequent calls to this same function
 380    obtain one char at the time, providing the caller with a behavior
 381    similar to fgetc. When the input is buffered, the backspaces have
 382    the needed effect, i.e. ignore the last char active in the buffer */
 383 /* so far this function is called only from the query function in
 384    utils.c */
 385
 386 unsigned int
 387 #ifdef __STDC__
 388 tuiBufferGetc (void)
 389 #else
 390 tuiBufferGetc ()
 391 #endif
 392 {
 393   unsigned int ch;
 394   static unsigned char _ibuffer[512];
 395   static int index_read = -1;
 396   static int length_of_answer = -1;
 397   int pos = 0;
 398
 399   if (length_of_answer == -1)
 400     {
 401       /* this is the first time through, need to read the answer */
 402       do
 403         {
 404           /* Call the curses routine that reads one character */
 405           ch = (unsigned int) wgetch (cmdWin->generic.handle);
 406           if (ch != '\b')
 407             {
 408               _ibuffer[pos] = ch;
 409               pos++;
 410             }
 411           else
 412             pos--;
 413         }
 414       while (ch != '\r' && ch != '\n');
 415
 416       length_of_answer = pos;
 417       index_read = 0;
 418     }
 419
 420   ch = _ibuffer[index_read];
 421   index_read++;
 422
 423   if (index_read == length_of_answer)
 424     {
 425       /*this is the last time through, reset for next query */
 426       index_read = -1;
 427       length_of_answer = -1;
 428     }
 429
 430   wrefresh (cmdWin->generic.handle);
 431
 432   return (ch);
 433 }                               /* tuiBufferGetc */
 434
 435
 436 /*
 437    ** tuiStartNewLines().
 438  */
 439 void
 440 #ifdef __STDC__
 441 tuiStartNewLines (
 442                    int numLines)
 443 #else
 444 tuiStartNewLines (numLines)
 445      int numLines;
 446 #endif
 447 {
 448   if (numLines > 0)
 449     {
 450       if (cmdWin->generic.viewportHeight > 1 &&
 451         cmdWin->detail.commandInfo.curLine < cmdWin->generic.viewportHeight)
 452         cmdWin->detail.commandInfo.curLine += numLines;
 453       else
 454         scroll (cmdWin->generic.handle);
 455       cmdWin->detail.commandInfo.curch = 0;
 456       wmove (cmdWin->generic.handle,
 457              cmdWin->detail.commandInfo.curLine,
 458              cmdWin->detail.commandInfo.curch);
 459       tuiRefreshWin (&cmdWin->generic);
 460     }
 461
 462   return;
 463 }                               /* tuiStartNewLines */
 464
 465
 466 /*
 467    ** tui_vStartNewLines().
 468    **        With numLines in a va_list
 469  */
 470 void
 471 #ifdef __STDC__
 472 tui_vStartNewLines (
 473                      va_list args)
 474 #else
 475 tui_vStartNewLines (args)
 476      va_list args;
 477 #endif
 478 {
 479   int numLines = va_arg (args, int);
 480
 481   tuiStartNewLines (numLines);
 482
 483   return;
 484 }                               /* tui_vStartNewLines */
 485
 486
 487 /****************************************************************************
 488 **                   LOCAL STATIC FUNCTIONS                                **
 489 *****************************************************************************/
 490
 491
 492 /*
 493    ** _tuiHandleResizeDuringIO
 494    **    This function manages the cleanup when a resize has occured
 495    **    From within a call to getch() or read.  Returns the character
 496    **    to return from getc or read.
 497  */
 498 static unsigned int
 499 #ifdef __STDC__
 500 _tuiHandleResizeDuringIO (
 501                            unsigned int originalCh)     /* the char just read */
 502 #else
 503 _tuiHandleResizeDuringIO (originalCh)
 504      unsigned int originalCh;
 505 #endif
 506 {
 507   if (tuiWinResized ())
 508     {
 509       tuiDo ((TuiOpaqueFuncPtr) tuiRefreshAll);
 510       dont_repeat ();
 511       tuiSetWinResizedTo (FALSE);
 512       rl_reset ();
 513       return '\n';
 514     }
 515   else
 516     return originalCh;
 517 }                               /* _tuiHandleResizeDuringIO */
 518
 519
 520 /*
 521    ** _updateCommandInfo().
 522    **        Function to update the command window information.
 523  */
 524 static void
 525 #ifdef __STDC__
 526 _updateCommandInfo (
 527                      int sizeOfString)
 528 #else
 529 _updateCommandInfo (sizeOfString)
 530      int sizeOfString;
 531 #endif
 532 {
 533
 534   if ((sizeOfString +
 535        cmdWin->detail.commandInfo.curch) > cmdWin->generic.width)
 536     {
 537       int newCurch = sizeOfString + cmdWin->detail.commandInfo.curch;
 538
 539       tuiStartNewLines (1);
 540       cmdWin->detail.commandInfo.curch = newCurch - cmdWin->generic.width;
 541     }
 542   else
 543     cmdWin->detail.commandInfo.curch += sizeOfString;
 544
 545   return;
 546 }                               /* _updateCommandInfo */
 547
 548
 549 /* Looked at in main.c, fputs_unfiltered(), to decide
 550  * if it's safe to do standard output to the command window.
 551  */
 552 int tui_owns_terminal = 0;
 553
 554 /* Called to set up the terminal for TUI (curses) I/O.
 555  * We do this either on our way "in" to GDB after target
 556  * program execution, or else within tuiDo just before
 557  * going off to TUI routines.
 558  */
 559
 560 void
 561 #ifdef __STDC__
 562 tuiTermSetup (
 563                int turn_off_echo)
 564 #else
 565 tuiTermSetup (turn_off_echo)
 566      int turn_off_echo;
 567 #endif
 568 {
 569   char *buffer;
 570   int start;
 571   int end;
 572   int endcol;
 573   extern char *term_scroll_region;
 574   extern char *term_cursor_move;
 575   extern char *term_memory_lock;
 576   extern char *term_memory_unlock;
 577
 578   /* Turn off echoing, since the TUI does not
 579      * expect echoing. Below I only put in the TERMIOS
 580      * case, since that is what applies on HP-UX. turn_off_echo
 581      * is 1 except for the case where we're being called
 582      * on a "quit", in which case we want to leave echo on.
 583    */
 584   if (turn_off_echo)
 585     {
 586 #ifdef HAVE_TERMIOS
 587       struct termios tio;
 588       tcgetattr (0, &tio);
 589       tio.c_lflag &= ~(ECHO);
 590       tcsetattr (0, TCSANOW, &tio);
 591 #endif
 592     }
 593
 594   /* Compute the start and end lines of the command
 595      * region. (Actually we only use end here)
 596    */
 597   start = winList[CMD_WIN]->generic.origin.y;
 598   end = start + winList[CMD_WIN]->generic.height - 1;
 599   endcol = winList[CMD_WIN]->generic.width - 1;
 600
 601   if (term_memory_unlock)
 602     {
 603
 604       /* Un-do the effect of the memory lock in terminal_inferior() */
 605       tputs (term_memory_unlock, 1, (int (*)PARAMS ((int))) putchar);
 606       fflush (stdout);
 607
 608     }
 609   else if (term_scroll_region)
 610     {
 611
 612       /* Un-do the effect of setting scroll region in terminal_inferior() */
 613       /* I'm actually not sure how to do this (we don't know for
 614        * sure what the scroll region was *before* we changed it),
 615        * but I'll guess that setting it to the whole screen is
 616        * the right thing. So, ...
 617        */
 618
 619       /* Set scroll region to be 0..end */
 620       buffer = (char *) tgoto (term_scroll_region, end, 0);
 621       tputs (buffer, 1, (int (*)PARAMS ((int))) putchar);
 622
 623     }                           /* else we're out of luck */
 624
 625   /* This is an attempt to keep the logical & physical
 626      * cursor in synch, going into curses. Without this,
 627      * curses seems to be confused by the fact that
 628      * GDB has physically moved the curser on it. One
 629      * visible effect of removing this code is that the
 630      * locator window fails to get updated and the line
 631      * of text that *should* go into the locator window
 632      * often goes to the wrong place.
 633    */
 634   /* What's done here is to  tell curses to write a ' '
 635      * at the bottom right corner of the screen.
 636      * The idea is to wind up with the cursor in a known
 637      * place.
 638      * Note I'm relying on refresh()
 639      * only writing what changed (the space),
 640      * not the whole screen.
 641    */
 642   standend ();
 643   move (end, endcol - 1);
 644   addch (' ');
 645   refresh ();
 646
 647   tui_owns_terminal = 1;
 648 }                               /* tuiTermSetup */
 649
 650
 651 /* Called to set up the terminal for target program I/O, meaning I/O
 652  * is confined to the command-window area.  We also call this on our
 653  * way out of tuiDo, thus setting up the terminal this way for
 654  * debugger command I/O.  */
 655 void
 656 #ifdef __STDC__
 657 tuiTermUnsetup (
 658                  int turn_on_echo,
 659                  int to_column)
 660 #else
 661 tuiTermUnsetup (turn_on_echo, to_column)
 662      int turn_on_echo;
 663      int to_column;
 664 #endif
 665 {
 666   int start;
 667   int end;
 668   int curline;
 669   char *buffer;
 670   /* The next bunch of things are from readline */
 671   extern char *term_scroll_region;
 672   extern char *term_cursor_move;
 673   extern char *term_memory_lock;
 674   extern char *term_memory_unlock;
 675   extern char *term_se;
 676
 677   /* We need to turn on echoing, since the TUI turns it off */
 678   /* Below I only put in the TERMIOS case, since that
 679      * is what applies on HP-UX.
 680    */
 681   if (turn_on_echo)
 682     {
 683 #ifdef HAVE_TERMIOS
 684       struct termios tio;
 685       tcgetattr (0, &tio);
 686       tio.c_lflag |= (ECHO);
 687       tcsetattr (0, TCSANOW, &tio);
 688 #endif
 689     }
 690
 691   /* Compute the start and end lines of the command
 692      * region, as well as the last "real" line of
 693      * the region (normally same as end, except when
 694      * we're first populating the region)
 695    */
 696   start = winList[CMD_WIN]->generic.origin.y;
 697   end = start + winList[CMD_WIN]->generic.height - 1;
 698   curline = start + winList[CMD_WIN]->detail.commandInfo.curLine;
 699
 700   /* We want to confine target I/O to the command region.
 701      * In order to do so, we must either have "memory lock"
 702      * (hpterm's) or "scroll regions" (xterm's).
 703    */
 704   if (term_cursor_move && term_memory_lock)
 705     {
 706
 707       /* Memory lock means lock region above cursor.
 708        * So first position the cursor, then call memory lock.
 709        */
 710       buffer = tgoto (term_cursor_move, 0, start);
 711       tputs (buffer, 1, (int (*)PARAMS ((int))) putchar);
 712       tputs (term_memory_lock, 1, (int (*)PARAMS ((int))) putchar);
 713
 714     }
 715   else if (term_scroll_region)
 716     {
 717
 718       /* Set the scroll region to the command window */
 719       buffer = tgoto (term_scroll_region, end, start);
 720       tputs (buffer, 1, (int (*)PARAMS ((int))) putchar);
 721
 722     }                           /* else we can't do anything about target I/O */
 723
 724   /* Also turn off standout mode, in case it is on */
 725   if (term_se != NULL)
 726     tputs (term_se, 1, (int (*)PARAMS ((int))) putchar);
 727
 728   /* Now go to the appropriate spot on the end line */
 729   buffer = tgoto (term_cursor_move, to_column, end);
 730   tputs (buffer, 1, (int (*)PARAMS ((int))) putchar);
 731   fflush (stdout);
 732
 733   tui_owns_terminal = 0;
 734 }                               /* tuiTermUnsetup */