Fix obscure C stdio bug
[projects/chimara/chimara.git] / libchimara / input.c
1 #include "charset.h"
2 #include "magic.h"
3 #include "input.h"
4 #include "pager.h"
5 #include "chimara-glk-private.h"
6 #include "garglk.h"
7
8 extern GPrivate *glk_data_key;
9
10 /* Forward declarations */
11 static int finish_text_buffer_line_input(winid_t win, gboolean emit_signal);
12 static int finish_text_grid_line_input(winid_t win, gboolean emit_signal);
13 static void cancel_old_input_request(winid_t win);
14
15 /* Internal function: code common to both flavors of char event request */
16 void
17 request_char_event_common(winid_t win, gboolean unicode)
18 {
19         VALID_WINDOW(win, return);
20         g_return_if_fail(win->type != wintype_TextBuffer || win->type != wintype_TextGrid);
21
22         cancel_old_input_request(win);
23
24         flush_window_buffer(win);
25
26         if(win->type == wintype_TextBuffer) {
27                 /* Move the input_position mark to the end of the window_buffer */
28                 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
29                 GtkTextMark *input_position = gtk_text_buffer_get_mark(buffer, "input_position");
30                 GtkTextIter end_iter;
31                 gtk_text_buffer_get_end_iter(buffer, &end_iter);
32                 gtk_text_buffer_move_mark(buffer, input_position, &end_iter);
33         }
34
35
36         win->input_request_type = unicode? INPUT_REQUEST_CHARACTER_UNICODE : INPUT_REQUEST_CHARACTER;
37         g_signal_handler_unblock( win->widget, win->char_input_keypress_handler );
38
39         gdk_threads_enter();
40         gtk_widget_grab_focus( GTK_WIDGET(win->widget) );
41         gdk_threads_leave();
42
43         /* Emit the "waiting" signal to let listeners know we are ready for input */
44         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
45         g_signal_emit_by_name(glk_data->self, "waiting");
46 }
47
48 /**
49  * glk_request_char_event:
50  * @win: A window to request char events from.
51  *
52  * Request input of a Latin-1 character or special key. A window cannot have
53  * requests for both character and line input at the same time. Nor can it have
54  * requests for character input of both types (Latin-1 and Unicode). It is
55  * illegal to call glk_request_char_event() if the window already has a pending
56  * request for either character or line input.
57  */
58 void
59 glk_request_char_event(winid_t win)
60 {
61         request_char_event_common(win, FALSE);
62 }
63
64 /**
65  * glk_request_char_event_uni:
66  * @win: A window to request char events from.
67  *
68  * Request input of a Unicode character or special key. See
69  * glk_request_char_event().
70  */
71 void
72 glk_request_char_event_uni(winid_t win)
73 {
74         request_char_event_common(win, TRUE);
75 }
76
77 /**
78  * glk_cancel_char_event:
79  * @win: A window to cancel the latest char event request on.
80  *
81  * This cancels a pending request for character input. (Either Latin-1 or
82  * Unicode.) For convenience, it is legal to call glk_cancel_char_event() even
83  * if there is no charcter input request on that window. Glk will ignore the
84  * call in this case.
85  */
86 void
87 glk_cancel_char_event(winid_t win)
88 {
89         VALID_WINDOW(win, return);
90         g_return_if_fail(win->type != wintype_TextBuffer || win->type != wintype_TextGrid);
91
92         if(win->input_request_type == INPUT_REQUEST_CHARACTER || win->input_request_type == INPUT_REQUEST_CHARACTER_UNICODE)
93         {
94                 win->input_request_type = INPUT_REQUEST_NONE;
95                 g_signal_handler_block( win->widget, win->char_input_keypress_handler );
96         }
97 }
98
99 /* Internal function: Request either latin-1 or unicode line input, in a text grid window. */
100 static void
101 text_grid_request_line_event_common(winid_t win, glui32 maxlen, gboolean insert, gchar *inserttext)
102 {
103         /* All outstanding printing _must_ be finished before putting an input entry
104          into the buffer */
105         flush_window_buffer(win);
106
107         gdk_threads_enter();
108
109         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
110
111     GtkTextMark *cursor = gtk_text_buffer_get_mark(buffer, "cursor_position");
112     GtkTextIter start_iter, end_iter;
113     gtk_text_buffer_get_iter_at_mark(buffer, &start_iter, cursor);
114
115     /* Determine the maximum length of the line input */
116     gint cursorpos = gtk_text_iter_get_line_offset(&start_iter);
117     /* Odd; the Glk spec says the maximum input length is
118     windowwidth - 1 - cursorposition. I say no, because if cursorposition is
119     zero, then the input should fill the whole line. FIXME??? */
120     win->input_length = MIN(win->width - cursorpos, win->line_input_buffer_max_len);
121     end_iter = start_iter;
122     gtk_text_iter_set_line_offset(&end_iter, cursorpos + win->input_length);
123
124         /* If the buffer currently has a selection with one bound in the middle of
125         the input field, then deselect it. Otherwise the input field gets trashed */
126         GtkTextIter start_sel, end_sel;
127         if( gtk_text_buffer_get_selection_bounds(buffer, &start_sel, &end_sel) )
128         {
129                 if( gtk_text_iter_in_range(&start_sel, &start_iter, &end_iter) )
130                         gtk_text_buffer_place_cursor(buffer, &end_sel);
131                 if( gtk_text_iter_in_range(&end_sel, &start_iter, &end_iter) )
132                         gtk_text_buffer_place_cursor(buffer, &start_sel);
133         }
134
135     /* Erase the text currently in the input field and replace it with a GtkEntry */
136     gtk_text_buffer_delete(buffer, &start_iter, &end_iter);
137     win->input_anchor = gtk_text_buffer_create_child_anchor(buffer, &start_iter);
138     win->input_entry = gtk_entry_new();
139         /* Set the entry's font to match that of the window */
140     GtkRcStyle *style = gtk_widget_get_modifier_style(win->widget);     /* Don't free */
141         gtk_widget_modify_font(win->input_entry, style->font_desc);
142         /* Make the entry as small as possible to fit with the text */
143         gtk_entry_set_has_frame(GTK_ENTRY(win->input_entry), FALSE);
144         GtkBorder border = { 0, 0, 0, 0 };
145
146         /* COMPAT: */
147 #if GTK_CHECK_VERSION(2,10,0)
148         gtk_entry_set_inner_border(GTK_ENTRY(win->input_entry), &border);
149 #endif
150     gtk_entry_set_max_length(GTK_ENTRY(win->input_entry), win->input_length);
151     gtk_entry_set_width_chars(GTK_ENTRY(win->input_entry), win->input_length);
152
153     /* Insert pre-entered text if needed */
154     if(insert)
155         gtk_entry_set_text(GTK_ENTRY(win->input_entry), inserttext);
156
157     /* Set background color of entry (TODO: implement as property) */
158     GdkColor background;
159         gdk_color_parse("grey", &background);
160     gtk_widget_modify_base(win->input_entry, GTK_STATE_NORMAL, &background);
161
162     g_signal_connect(win->input_entry, "activate", G_CALLBACK(on_input_entry_activate), win);
163     g_signal_connect(win->input_entry, "key-press-event", G_CALLBACK(on_input_entry_key_press_event), win);
164     win->line_input_entry_changed = g_signal_connect(win->input_entry, "changed", G_CALLBACK(on_input_entry_changed), win);
165
166     gtk_widget_show(win->input_entry);
167     gtk_text_view_add_child_at_anchor(GTK_TEXT_VIEW(win->widget), win->input_entry, win->input_anchor);
168
169         gtk_widget_grab_focus(win->input_entry);
170
171         gdk_threads_leave();
172 }
173
174 /* Internal function: Request either latin-1 or unicode line input, in a text buffer window. */
175 static void
176 text_buffer_request_line_event_common(winid_t win, glui32 maxlen, gboolean insert, gchar *inserttext)
177 {
178         flush_window_buffer(win);
179
180         gdk_threads_enter();
181
182         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
183
184     /* Move the input_position mark to the end of the window_buffer */
185     GtkTextMark *input_position = gtk_text_buffer_get_mark(buffer, "input_position");
186     GtkTextIter end_iter;
187     gtk_text_buffer_get_end_iter(buffer, &end_iter);
188     gtk_text_buffer_move_mark(buffer, input_position, &end_iter);
189
190     /* Set the entire contents of the window_buffer as uneditable
191      * (so input can only be entered at the end) */
192     GtkTextIter start_iter;
193     gtk_text_buffer_get_start_iter(buffer, &start_iter);
194     gtk_text_buffer_remove_tag_by_name(buffer, "uneditable", &start_iter, &end_iter);
195     gtk_text_buffer_apply_tag_by_name(buffer, "uneditable", &start_iter, &end_iter);
196
197     /* Insert pre-entered text if needed */
198     if(insert) {
199         gtk_text_buffer_insert(buffer, &end_iter, inserttext, -1);
200                 gtk_text_buffer_get_end_iter(buffer, &end_iter); /* update after text insertion */
201         }
202
203         /* Apply the correct style to the input prompt */
204         GtkTextIter input_iter;
205     gtk_text_buffer_get_iter_at_mark(buffer, &input_iter, input_position);
206     gtk_text_buffer_apply_tag_by_name(buffer, "default", &input_iter, &end_iter);
207     gtk_text_buffer_apply_tag_by_name(buffer, "input", &input_iter, &end_iter);
208     gtk_text_buffer_apply_tag_by_name(buffer, "glk-input", &input_iter, &end_iter);
209
210     gtk_text_view_set_editable(GTK_TEXT_VIEW(win->widget), TRUE);
211
212         g_signal_handler_unblock(buffer, win->insert_text_handler);
213         gtk_widget_grab_focus(win->widget);
214
215         gdk_threads_leave();
216 }
217
218 /**
219  * glk_request_line_event:
220  * @win: A text buffer or text grid window to request line input on.
221  * @buf: A buffer of at least @maxlen bytes.
222  * @maxlen: Length of the buffer.
223  * @initlen: The number of characters in @buf to pre-enter.
224  *
225  * Requests input of a line of Latin-1 characters. A window cannot have requests
226  * for both character and line input at the same time. Nor can it have requests
227  * for line input of both types (Latin-1 and Unicode). It is illegal to call
228  * glk_request_line_event() if the window already has a pending request for
229  * either character or line input.
230  *
231  * The @buf argument is a pointer to space where the line input will be stored.
232  * (This may not be %NULL.) @maxlen is the length of this space, in bytes; the
233  * library will not accept more characters than this. If @initlen is nonzero,
234  * then the first @initlen bytes of @buf will be entered as pre-existing input
235  * — just as if the player had typed them himself. (The player can continue
236  * composing after this pre-entered input, or delete it or edit as usual.)
237  *
238  * The contents of the buffer are undefined until the input is completed (either
239  * by a line input event, or glk_cancel_line_event(). The library may or may not
240  * fill in the buffer as the player composes, while the input is still pending;
241  * it is illegal to change the contents of the buffer yourself.
242  */
243 void
244 glk_request_line_event(winid_t win, char *buf, glui32 maxlen, glui32 initlen)
245 {
246         VALID_WINDOW(win, return);
247         g_return_if_fail(buf);
248         g_return_if_fail(win->type != wintype_TextBuffer || win->type != wintype_TextGrid);
249         g_return_if_fail(initlen <= maxlen);
250
251         cancel_old_input_request(win);
252
253         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
254
255         /* Register the buffer */
256         if(glk_data->register_arr)
257         win->buffer_rock = (*glk_data->register_arr)(buf, maxlen, "&+#!Cn");
258
259         win->input_request_type = INPUT_REQUEST_LINE;
260         win->line_input_buffer = buf;
261         win->line_input_buffer_max_len = maxlen;
262         win->echo_current_line_input = win->echo_line_input;
263         win->current_extra_line_terminators = g_slist_copy(win->extra_line_terminators);
264
265         gchar *inserttext = (initlen > 0)? g_strndup(buf, initlen) : g_strdup("");
266         switch(win->type)
267         {
268             case wintype_TextBuffer:
269                 text_buffer_request_line_event_common(win, maxlen, (initlen > 0), inserttext);
270                 break;
271             case wintype_TextGrid:
272                 text_grid_request_line_event_common(win, maxlen, (initlen > 0), inserttext);
273                 break;
274     }
275         g_free(inserttext);
276         g_signal_handler_unblock(win->widget, win->line_input_keypress_handler);
277
278         /* Emit the "waiting" signal to let listeners know we are ready for input */
279         g_signal_emit_by_name(glk_data->self, "waiting");
280 }
281
282 /**
283  * glk_request_line_event_uni:
284  * @win: A text buffer or text grid window to request line input on.
285  * @buf: A buffer of at least @maxlen characters.
286  * @maxlen: Length of the buffer.
287  * @initlen: The number of characters in @buf to pre-enter.
288  *
289  * Request input of a line of Unicode characters. This works the same as
290  * glk_request_line_event(), except the result is stored in an array of
291  * <type>glui32</type> values instead of an array of characters, and the values
292  * may be any valid Unicode code points.
293  *
294  * If possible, the library should return fully composed Unicode characters,
295  * rather than strings of base and composition characters.
296  *
297  * <note><para>
298  *   Fully-composed characters are the norm for Unicode text, so an
299  *   implementation that ignores this issue will probably produce the right
300  *   result. However, the game may not want to rely on that. Another factor is
301  *   that case-folding can (occasionally) produce non-normalized text.
302  *   Therefore, to cover all its bases, a game should call
303  *   glk_buffer_to_lower_case_uni(), followed by
304  *   glk_buffer_canon_normalize_uni(), before parsing.
305  * </para></note>
306  *
307  * <note><para>
308  *   Earlier versions of this spec said that line input must always be in
309  *   Unicode Normalization Form C. However, this has not been universally
310  *   implemented. It is also somewhat redundant, for the results noted above.
311  *   Therefore, we now merely recommend that line input be fully composed. The
312  *   game is ultimately responsible for all case-folding and normalization. See
313  *   <link linkend="chimara-Unicode-String-Normalization">Unicode String
314  *   Normalization</link>.
315  * </para></note>
316  */
317 void
318 glk_request_line_event_uni(winid_t win, glui32 *buf, glui32 maxlen, glui32 initlen)
319 {
320         VALID_WINDOW(win, return);
321         g_return_if_fail(buf);
322         g_return_if_fail(win->type != wintype_TextBuffer || win->type != wintype_TextGrid);
323         g_return_if_fail(initlen <= maxlen);
324
325         cancel_old_input_request(win);
326         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
327
328         /* Register the buffer */
329         if(glk_data->register_arr)
330         win->buffer_rock = (*glk_data->register_arr)(buf, maxlen, "&+#!Iu");
331
332         win->input_request_type = INPUT_REQUEST_LINE_UNICODE;
333         win->line_input_buffer_unicode = buf;
334         win->line_input_buffer_max_len = maxlen;
335         win->echo_current_line_input = win->echo_line_input;
336         win->current_extra_line_terminators = g_slist_copy(win->extra_line_terminators);
337
338         gchar *utf8;
339         if(initlen > 0) {
340                 utf8 = convert_ucs4_to_utf8(buf, initlen);
341                 if(utf8 == NULL)
342                         return;
343         }
344         else
345                 utf8 = g_strdup("");
346
347     switch(win->type)
348         {
349             case wintype_TextBuffer:
350                 text_buffer_request_line_event_common(win, maxlen, (initlen > 0), utf8);
351                 break;
352             case wintype_TextGrid:
353                 text_grid_request_line_event_common(win, maxlen, (initlen > 0), utf8);
354                 break;
355     }
356     g_signal_handler_unblock(win->widget, win->line_input_keypress_handler);
357         g_free(utf8);
358
359         /* Emit the "waiting" signal to let listeners know we are ready for input */
360         g_signal_emit_by_name(glk_data->self, "waiting");
361 }
362
363 /**
364  * glk_cancel_line_event:
365  * @win: A text buffer or text grid window to cancel line input on.
366  * @event: Will be filled in if the user had already input something.
367  *
368  * This cancels a pending request for line input. (Either Latin-1 or Unicode.)
369  *
370  * The event pointed to by the event argument will be filled in as if the
371  * player had hit <keycap>enter</keycap>, and the input composed so far will be
372  * stored in the buffer; see below. If you do not care about this information,
373  * pass %NULL as the @event argument. (The buffer will still be filled.)
374  *
375  * For convenience, it is legal to call glk_cancel_line_event() even if there
376  * is no line input request on that window. The event type will be set to
377  * %evtype_None in this case.
378  */
379 void
380 glk_cancel_line_event(winid_t win, event_t *event)
381 {
382         VALID_WINDOW(win, return);
383         g_return_if_fail(win->type != wintype_TextBuffer || win->type != wintype_TextGrid);
384
385         if(event != NULL) {
386                 event->type = evtype_None;
387                 event->win = win;
388                 event->val1 = 0;
389                 event->val2 = 0;
390         }
391
392         if(win->input_request_type != INPUT_REQUEST_LINE && win->input_request_type != INPUT_REQUEST_LINE_UNICODE)
393                 return;
394
395         g_signal_handler_block( win->widget, win->line_input_keypress_handler );
396
397         int chars_written = 0;
398
399         gdk_threads_enter();
400         if(win->type == wintype_TextGrid) {
401                 chars_written = finish_text_grid_line_input(win, FALSE);
402         } else if(win->type == wintype_TextBuffer) {
403                 gtk_text_view_set_editable( GTK_TEXT_VIEW(win->widget), FALSE );
404                 GtkTextBuffer *window_buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
405                 g_signal_handler_block(window_buffer, win->insert_text_handler);
406                 chars_written = finish_text_buffer_line_input(win, FALSE);
407         }
408         gdk_threads_leave();
409
410         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
411         if(glk_data->unregister_arr)
412         {
413                 if(win->input_request_type == INPUT_REQUEST_LINE_UNICODE)
414                         (*glk_data->unregister_arr)(win->line_input_buffer_unicode, win->line_input_buffer_max_len, "&+#!Iu", win->buffer_rock);
415                 else
416                 (*glk_data->unregister_arr)(win->line_input_buffer, win->line_input_buffer_max_len, "&+#!Cn", win->buffer_rock);
417     }
418
419         if(event != NULL && chars_written > 0) {
420                 event->type = evtype_LineInput;
421                 event->val1 = chars_written;
422         }
423 }
424
425 /* Helper function: Turn off shutdown key-press-event signal handler */
426 static gboolean
427 turn_off_handler(GNode *node)
428 {
429         winid_t win = node->data;
430         g_signal_handler_block(win->widget, win->shutdown_keypress_handler);
431         return FALSE; /* don't stop */
432 }
433
434 /* Internal function: Callback for signal key-press-event while waiting for shutdown. */
435 gboolean
436 on_shutdown_key_press_event(GtkWidget *widget, GdkEventKey *event, winid_t win)
437 {
438         ChimaraGlk *glk = CHIMARA_GLK(gtk_widget_get_ancestor(widget, CHIMARA_TYPE_GLK));
439         g_assert(glk);
440         CHIMARA_GLK_USE_PRIVATE(glk, priv);
441         
442         /* Turn off all the signal handlers */
443         if(priv->root_window)
444                 g_node_traverse(priv->root_window, G_IN_ORDER, G_TRAVERSE_LEAVES, -1, (GNodeTraverseFunc)turn_off_handler, NULL);
445         
446         /* Signal the Glk library that it can shut everything down now */
447         g_mutex_lock(priv->shutdown_lock);
448         g_cond_signal(priv->shutdown_key_pressed);
449         g_mutex_unlock(priv->shutdown_lock);
450         
451         return TRUE; /* block the event */
452 }
453
454 /* Internal function: General callback for signal key-press-event on a text buffer or text grid window. Used in character input on both text buffers and grids. Blocked when not in use. */
455 gboolean
456 on_char_input_key_press_event(GtkWidget *widget, GdkEventKey *event, winid_t win)
457 {
458         /* Ignore modifier keys, otherwise the char input will already trigger on 
459         the shift key when the user tries to type a capital letter */
460         if(event->is_modifier)
461                 return FALSE; /* don't stop the event */
462
463         /* All text up to the input position is now regarded as being read by the user */
464         if(win->type == wintype_TextBuffer)
465                 pager_update(win);
466         
467         glui32 keycode = keyval_to_glk_keycode(event->keyval, win->input_request_type == INPUT_REQUEST_CHARACTER_UNICODE);
468
469         ChimaraGlk *glk = CHIMARA_GLK(gtk_widget_get_ancestor(widget, CHIMARA_TYPE_GLK));
470         g_assert(glk);
471         event_throw(glk, evtype_CharInput, win, keycode, 0);
472         g_signal_emit_by_name(glk, "char-input", win->rock, event->keyval);
473
474         /* Only one keypress will be handled */
475         win->input_request_type = INPUT_REQUEST_NONE;
476         g_signal_handler_block(win->widget, win->char_input_keypress_handler);
477
478         return TRUE;
479 }
480
481 gboolean
482 on_line_input_key_press_event(GtkWidget *widget, GdkEventKey *event, winid_t win)
483 {
484         switch(win->type)
485         {
486                 case wintype_TextBuffer:
487                 {
488                         /* All text up to the input position is now regarded as being read by the user */
489                         pager_update(win);
490
491                         GtkTextBuffer *buffer = gtk_text_view_get_buffer(GTK_TEXT_VIEW(win->widget));
492
493                         /* History up/down */
494                         if(event->keyval == GDK_Up || event->keyval == GDK_KP_Up
495                                 || event->keyval == GDK_Down || event->keyval == GDK_KP_Down)
496                         {
497                                 /* Prevent falling off the end of the history list */
498                                 if(win->history == NULL)
499                                         return TRUE;
500                                 if( (event->keyval == GDK_Up || event->keyval == GDK_KP_Up)
501                                         && win->history_pos && win->history_pos->next == NULL)
502                                         return TRUE;
503                                 if( (event->keyval == GDK_Down || event->keyval == GDK_KP_Down)
504                                         && (win->history_pos == NULL || win->history_pos->prev == NULL) )
505                                         return TRUE;
506
507                                 GtkTextIter start, end;
508                                 /* Erase any text that was already typed */
509                                 GtkTextMark *input_position = gtk_text_buffer_get_mark(buffer, "input_position");
510                                 gtk_text_buffer_get_iter_at_mark(buffer, &start, input_position);
511                                 gtk_text_buffer_get_end_iter(buffer, &end);
512
513                                 if(win->history_pos == NULL) {
514                                         gchar *current_input = gtk_text_buffer_get_text(buffer, &start, &end, FALSE);
515                                         win->history = g_list_prepend(win->history, current_input);
516                                         win->history_pos = win->history;
517                                 }
518
519                                 gtk_text_buffer_delete(buffer, &start, &end);
520
521                                 if(event->keyval == GDK_Up || event->keyval == GDK_KP_Up)
522                                 {
523                                         if(win->history_pos)
524                                                 win->history_pos = g_list_next(win->history_pos);
525                                         else
526                                                 win->history_pos = win->history;
527                                 }
528                                 else /* down */
529                                         win->history_pos = g_list_previous(win->history_pos);
530
531                                 /* Insert the history item into the window */
532                                 gtk_text_buffer_get_end_iter(buffer, &end);
533
534                                 g_signal_handler_block(buffer, win->insert_text_handler);
535                                 gtk_text_buffer_insert_with_tags_by_name(buffer, &end, win->history_pos->data, -1, "default", "input", "glk-input", NULL);
536
537                                 g_signal_handler_unblock(buffer, win->insert_text_handler);
538                                 return TRUE;
539                         }
540
541                         /* Move to beginning/end of input field */
542                         else if(event->keyval == GDK_Home) {
543                                 GtkTextIter input_iter;
544                                 GtkTextMark *input_position = gtk_text_buffer_get_mark(buffer, "input_position");
545                                 gtk_text_buffer_get_iter_at_mark(buffer, &input_iter, input_position);
546                                 gtk_text_buffer_place_cursor(buffer, &input_iter);
547                                 return TRUE;
548                         }
549                         else if(event->keyval == GDK_End) {
550                                 GtkTextIter end_iter;
551                                 gtk_text_buffer_get_end_iter(buffer, &end_iter);
552                                 gtk_text_buffer_place_cursor(buffer, &end_iter);
553                                 return TRUE;
554                         }
555
556                         /* Handle the line terminators */
557                         else if(event->keyval == GDK_Return || event->keyval == GDK_KP_Enter
558                            || g_slist_find(win->current_extra_line_terminators, GUINT_TO_POINTER(event->keyval)))
559                         {
560                                 /* Remove signal handlers */
561                                 g_signal_handler_block(buffer, win->insert_text_handler);
562                                 g_signal_handler_block(win->widget, win->line_input_keypress_handler);
563
564                                 /* Insert a newline (even if line input was terminated with a different key */
565                                 GtkTextIter end;
566                                 gtk_text_buffer_get_end_iter(buffer, &end);
567                                 gtk_text_buffer_insert(buffer, &end, "\n", 1);
568                                 gtk_text_buffer_place_cursor(buffer, &end);
569
570                                 /* Make the window uneditable again and retrieve the text that was input */
571                                 gtk_text_view_set_editable(GTK_TEXT_VIEW(win->widget), FALSE);
572
573                                 int chars_written = finish_text_buffer_line_input(win, TRUE);
574                                 ChimaraGlk *glk = CHIMARA_GLK(gtk_widget_get_ancestor(win->widget, CHIMARA_TYPE_GLK));
575                                 event_throw(glk, evtype_LineInput, win, chars_written, 0);
576                                 return TRUE;
577                         }
578                 }
579                         return FALSE;
580
581                 /* If this is a text grid window, then redirect the key press to the line input GtkEntry */
582                 case wintype_TextGrid:
583                 {
584                         if(event->keyval == GDK_Up || event->keyval == GDK_KP_Up
585                                 || event->keyval == GDK_Down || event->keyval == GDK_KP_Down
586                                 || event->keyval == GDK_Left || event->keyval == GDK_KP_Left
587                                 || event->keyval == GDK_Right || event->keyval == GDK_KP_Right
588                                 || event->keyval == GDK_Tab || event->keyval == GDK_KP_Tab
589                                 || event->keyval == GDK_Page_Up || event->keyval == GDK_KP_Page_Up
590                                 || event->keyval == GDK_Page_Down || event->keyval == GDK_KP_Page_Down
591                                 || event->keyval == GDK_Home || event->keyval == GDK_KP_Home
592                                 || event->keyval == GDK_End || event->keyval == GDK_KP_End)
593                                 return FALSE; /* Don't redirect these keys */
594                         gtk_widget_grab_focus(win->input_entry);
595                         gtk_editable_set_position(GTK_EDITABLE(win->input_entry), -1);
596                         gboolean retval = TRUE;
597                         g_signal_emit_by_name(win->input_entry, "key-press-event", event, &retval);
598                         return retval; /* Block this key event if the entry handled it */
599                 }
600         }
601         return FALSE;
602 }
603
604 /* Internal function: finish handling a line input request, for both text grid and text buffer windows. */
605 static int
606 write_to_window_buffer(winid_t win, const gchar *inserted_text)
607 {
608         int copycount = 0;
609
610     /* Convert the string from UTF-8 to Latin-1 or Unicode */
611     if(win->input_request_type == INPUT_REQUEST_LINE)
612     {
613         gsize bytes_written;
614         gchar *latin1 = convert_utf8_to_latin1(inserted_text, &bytes_written);
615
616         if(latin1 == NULL)
617             return 0;
618
619         /* Place input in the echo stream */
620         if(win->echo_stream != NULL)
621             glk_put_string_stream(win->echo_stream, latin1);
622
623         /* Copy the string (bytes_written does not include the NULL at the end) */
624         copycount = MIN(win->line_input_buffer_max_len, bytes_written);
625         memcpy(win->line_input_buffer, latin1, copycount);
626         g_free(latin1);
627     }
628     else if(win->input_request_type == INPUT_REQUEST_LINE_UNICODE)
629     {
630         glong items_written;
631         gunichar *unicode = convert_utf8_to_ucs4(inserted_text, &items_written);
632
633         if(unicode == NULL)
634             return 0;
635
636         /* Place input in the echo stream */
637         if(win->echo_stream != NULL)
638             glk_put_string_stream_uni(win->echo_stream, unicode);
639
640         /* Copy the string (but not the NULL at the end) */
641         copycount = MIN(win->line_input_buffer_max_len, items_written);
642         memcpy(win->line_input_buffer_unicode, unicode, copycount * sizeof(gunichar));
643         g_free(unicode);
644     }
645     else
646         WARNING("Wrong input request type");
647
648     win->input_request_type = INPUT_REQUEST_NONE;
649         return copycount;
650 }
651
652 /* Internal function: Retrieves the input of a TextBuffer window and stores it in the window buffer.
653  * Returns the number of characters written, suitable for inclusion in a line input event. */
654 static int
655 finish_text_buffer_line_input(winid_t win, gboolean emit_signal)
656 {
657         VALID_WINDOW(win, return 0);
658         g_return_val_if_fail(win->type == wintype_TextBuffer, 0);
659
660         GtkTextIter start_iter, end_iter;
661
662         GtkTextBuffer *window_buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
663         GtkTextMark *input_position = gtk_text_buffer_get_mark(window_buffer, "input_position");
664         gtk_text_buffer_get_iter_at_mark(window_buffer, &start_iter, input_position);
665         gtk_text_buffer_get_end_iter(window_buffer, &end_iter);
666
667         gchar *inserted_text = gtk_text_buffer_get_text(window_buffer, &start_iter, &end_iter, FALSE);
668
669         /* If echoing is turned off, remove the text from the window */
670         if(!win->echo_current_line_input)
671                 gtk_text_buffer_delete(window_buffer, &start_iter, &end_iter);
672
673         /* Don't include the newline in the input */
674         char *last_char = inserted_text + strlen(inserted_text) - 1;
675         if(*last_char == '\n')
676                 *last_char = '\0';
677
678         int chars_written = write_to_window_buffer(win, inserted_text);
679         if(emit_signal)
680         {
681                 ChimaraGlk *glk = CHIMARA_GLK(gtk_widget_get_ancestor(win->widget, CHIMARA_TYPE_GLK));
682                 g_assert(glk);
683                 g_signal_emit_by_name(glk, "line-input", win->rock, inserted_text);
684         }
685
686         /* Add the text to the window input history */
687         if(win->history_pos != NULL)
688         {
689                 g_free(win->history->data);
690                 win->history = g_list_delete_link(win->history, win->history);
691         }
692         if(*inserted_text != 0)
693                 win->history = g_list_prepend(win->history, g_strdup(inserted_text));
694
695         win->history_pos = NULL;
696
697         g_free(inserted_text);
698
699         return chars_written;
700 }
701
702 /* Internal function: Retrieves the input of a TextGrid window and stores it in the window buffer.
703  * Returns the number of characters written, suitable for inclusion in a line input event. */
704 static int
705 finish_text_grid_line_input(winid_t win, gboolean emit_signal)
706 {
707         VALID_WINDOW(win, return 0);
708         g_return_val_if_fail(win->type == wintype_TextGrid, 0);
709
710         GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
711
712         gchar *text = g_strdup( gtk_entry_get_text(GTK_ENTRY(win->input_entry)) );
713         /* Move the focus back into the text view */
714         gtk_widget_grab_focus(win->widget);
715         /* Remove entry widget from text view */
716         /* Should be ok even though this is the widget's own signal handler */
717         gtk_container_remove( GTK_CONTAINER(win->widget), GTK_WIDGET(win->input_entry) );
718         win->input_entry = NULL;
719         /* Delete the child anchor */
720         GtkTextIter start, end;
721         gtk_text_buffer_get_iter_at_child_anchor(buffer, &start, win->input_anchor);
722         end = start;
723         gtk_text_iter_forward_char(&end); /* Point after the child anchor */
724         gtk_text_buffer_delete(buffer, &start, &end);
725         win->input_anchor = NULL;
726
727     gchar *spaces = g_strnfill(win->input_length - g_utf8_strlen(text, -1), ' ');
728     gchar *text_to_insert = g_strconcat(text, spaces, NULL);
729         g_free(spaces);
730     gtk_text_buffer_insert(buffer, &start, text_to_insert, -1);
731     g_free(text_to_insert);
732
733     int chars_written = write_to_window_buffer(win, text);
734     if(emit_signal)
735     {
736                 ChimaraGlk *glk = CHIMARA_GLK(gtk_widget_get_ancestor(win->widget, CHIMARA_TYPE_GLK));
737                 g_assert(glk);
738                 g_signal_emit_by_name(glk, "line-input", win->rock, text);
739     }
740
741         /* Add the text to the window input history */
742         if(win->history_pos != NULL)
743         {
744                 g_free(win->history->data);
745                 win->history = g_list_delete_link(win->history, win->history);
746         }
747         if(*text != 0)
748                 win->history = g_list_prepend(win->history, g_strdup(text));
749         win->history_pos = NULL;
750
751         g_free(text);
752         return chars_written;
753 }
754
755 /* Internal function: Callback for signal insert-text on a text buffer window.
756 Runs after the default handler has already inserted the text. */
757 void
758 after_window_insert_text(GtkTextBuffer *textbuffer, GtkTextIter *location, gchar *text, gint len, winid_t win)
759 {
760         GtkTextBuffer *window_buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
761
762         /* Set the history position to NULL and erase the text we were already editing */
763         if(win->history_pos != NULL)
764         {
765                 g_free(win->history->data);
766                 win->history = g_list_delete_link(win->history, win->history);
767                 win->history_pos = NULL;
768         }
769
770         /* Apply the 'input' style to the text that was entered */
771         GtkTextIter end_iter;
772         gtk_text_buffer_get_end_iter(window_buffer, &end_iter);
773         GtkTextIter input_iter;
774         GtkTextMark *input_position = gtk_text_buffer_get_mark(window_buffer, "input_position");
775         gtk_text_buffer_get_iter_at_mark(window_buffer, &input_iter, input_position);
776         gtk_text_buffer_apply_tag_by_name(window_buffer, "input", &input_iter, &end_iter);
777 }
778
779 /* Internal function: Callback for signal activate on the line input GtkEntry
780 in a text grid window. */
781 void
782 on_input_entry_activate(GtkEntry *input_entry, winid_t win)
783 {
784         g_signal_handler_block(win->widget, win->line_input_keypress_handler);
785
786         int chars_written = finish_text_grid_line_input(win, TRUE);
787         ChimaraGlk *glk = CHIMARA_GLK(gtk_widget_get_ancestor(win->widget, CHIMARA_TYPE_GLK));
788         event_throw(glk, evtype_LineInput, win, chars_written, 0);
789 }
790
791 /* Internal function: Callback for signal key-press-event on the line input
792 GtkEntry in a text grid window. */
793 gboolean
794 on_input_entry_key_press_event(GtkEntry *input_entry, GdkEventKey *event, winid_t win)
795 {
796         if(event->keyval == GDK_Up || event->keyval == GDK_KP_Up
797                 || event->keyval == GDK_Down || event->keyval == GDK_KP_Down)
798         {
799                 /* Prevent falling off the end of the history list */
800                 if( (event->keyval == GDK_Up || event->keyval == GDK_KP_Up)
801                         && win->history_pos && win->history_pos->next == NULL)
802                         return TRUE;
803                 if( (event->keyval == GDK_Down || event->keyval == GDK_KP_Down)
804                         && (win->history_pos == NULL || win->history_pos->prev == NULL) )
805                         return TRUE;
806
807                 if(win->history_pos == NULL)
808                 {
809                         const gchar *current_input = gtk_entry_get_text(input_entry);
810                         win->history = g_list_prepend(win->history, g_strdup(current_input));
811                         win->history_pos = win->history;
812                 }
813
814                 if(event->keyval == GDK_Up || event->keyval == GDK_KP_Up)
815                 {
816                         if(win->history_pos)
817                                 win->history_pos = g_list_next(win->history_pos);
818                         else
819                                 win->history_pos = win->history;
820                 }
821                 else /* down */
822                         win->history_pos = g_list_previous(win->history_pos);
823
824                 /* Insert the history item into the window */
825                 g_signal_handler_block(input_entry, win->line_input_entry_changed);
826                 gtk_entry_set_text(input_entry, win->history_pos->data);
827                 g_signal_handler_unblock(input_entry, win->line_input_entry_changed);
828                 return TRUE;
829         }
830         else if(g_slist_find(win->current_extra_line_terminators, GUINT_TO_POINTER(event->keyval)))
831         {
832                 /* If this key was a line terminator, pretend we pressed enter */
833                 on_input_entry_activate(input_entry, win);
834         }
835         return FALSE;
836 }
837
838 void
839 on_input_entry_changed(GtkEditable *editable, winid_t win)
840 {
841         /* Set the history position to NULL and erase the text we were already editing */
842         if(win->history_pos != NULL)
843         {
844                 g_free(win->history->data);
845                 win->history = g_list_delete_link(win->history, win->history);
846                 win->history_pos = NULL;
847         }
848 }
849
850 glui32
851 keyval_to_glk_keycode(guint keyval, gboolean unicode)
852 {
853         glui32 keycode;
854         switch(keyval) {
855                 case GDK_Up:
856                 case GDK_KP_Up: return keycode_Up;
857                 case GDK_Down:
858                 case GDK_KP_Down: return keycode_Down;
859                 case GDK_Left:
860                 case GDK_KP_Left: return keycode_Left;
861                 case GDK_Right:
862                 case GDK_KP_Right: return keycode_Right;
863                 case GDK_Linefeed:
864                 case GDK_Return:
865                 case GDK_KP_Enter: return keycode_Return;
866                 case GDK_Delete:
867                 case GDK_BackSpace:
868                 case GDK_KP_Delete: return keycode_Delete;
869                 case GDK_Escape: return keycode_Escape;
870                 case GDK_Tab:
871                 case GDK_KP_Tab: return keycode_Tab;
872                 case GDK_Page_Up:
873                 case GDK_KP_Page_Up: return keycode_PageUp;
874                 case GDK_Page_Down:
875                 case GDK_KP_Page_Down: return keycode_PageDown;
876                 case GDK_Home:
877                 case GDK_KP_Home: return keycode_Home;
878                 case GDK_End:
879                 case GDK_KP_End: return keycode_End;
880                 case GDK_F1:
881                 case GDK_KP_F1: return keycode_Func1;
882                 case GDK_F2:
883                 case GDK_KP_F2: return keycode_Func2;
884                 case GDK_F3:
885                 case GDK_KP_F3: return keycode_Func3;
886                 case GDK_F4:
887                 case GDK_KP_F4: return keycode_Func4;
888                 case GDK_F5: return keycode_Func5;
889                 case GDK_F6: return keycode_Func6;
890                 case GDK_F7: return keycode_Func7;
891                 case GDK_F8: return keycode_Func8;
892                 case GDK_F9: return keycode_Func9;
893                 case GDK_F10: return keycode_Func10;
894                 case GDK_F11: return keycode_Func11;
895                 case GDK_F12: return keycode_Func12;
896                 default:
897                         keycode = gdk_keyval_to_unicode(keyval);
898                         /* If keycode is 0, then keyval was not recognized; also return
899                         unknown if Latin-1 input was requested and the character is not in
900                         Latin-1 */
901                         if(keycode == 0 || (!unicode && keycode > 255))
902                                 return keycode_Unknown;
903                         return keycode;
904         }
905 }
906
907 void
908 force_char_input_from_queue(winid_t win, event_t *event)
909 {
910         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
911         guint keyval = GPOINTER_TO_UINT(g_async_queue_pop(glk_data->char_input_queue));
912
913         glk_cancel_char_event(win);
914
915         gdk_threads_enter();
916         ChimaraGlk *glk = CHIMARA_GLK(gtk_widget_get_ancestor(win->widget, CHIMARA_TYPE_GLK));
917         g_assert(glk);
918         g_signal_emit_by_name(glk, "char-input", win->rock, keyval);
919         gdk_threads_leave();
920
921         event->type = evtype_CharInput;
922         event->win = win;
923         event->val1 = keyval_to_glk_keycode(keyval, win->input_request_type == INPUT_REQUEST_CHARACTER_UNICODE);
924         event->val2 = 0;
925 }
926
927 void
928 force_line_input_from_queue(winid_t win, event_t *event)
929 {
930         ChimaraGlkPrivate *glk_data = g_private_get(glk_data_key);
931         const gchar *text = g_async_queue_pop(glk_data->line_input_queue);
932         glui32 chars_written = 0;
933
934         gdk_threads_enter();
935         if(win->type == wintype_TextBuffer)
936         {
937                 GtkTextBuffer *buffer = gtk_text_view_get_buffer( GTK_TEXT_VIEW(win->widget) );
938                 GtkTextIter start, end;
939
940                 /* Remove signal handlers so the line input doesn't get picked up again */
941                 g_signal_handler_block(buffer, win->insert_text_handler);
942                 g_signal_handler_block(win->widget, win->line_input_keypress_handler);
943
944                 /* Erase any text that was already typed */
945                 GtkTextMark *input_position = gtk_text_buffer_get_mark(buffer, "input_position");
946                 gtk_text_buffer_get_iter_at_mark(buffer, &start, input_position);
947                 gtk_text_buffer_get_end_iter(buffer, &end);
948                 gtk_text_buffer_delete(buffer, &start, &end);
949
950                 /* Make the window uneditable again */
951                 gtk_text_view_set_editable(GTK_TEXT_VIEW(win->widget), FALSE);
952
953                 /* Insert the forced input into the window */
954                 if(win->echo_current_line_input)
955                 {
956                         gtk_text_buffer_get_end_iter(buffer, &end);
957                         gchar *text_to_insert = g_strconcat(text, "\n", NULL);
958                         gtk_text_buffer_insert_with_tags_by_name(buffer, &end, text_to_insert, -1, "default", "input", NULL);
959                 }
960
961                 chars_written = finish_text_buffer_line_input(win, TRUE);
962         }
963         else if(win->type == wintype_TextGrid)
964         {
965                 /* Remove signal handlers so the line input doesn't get picked up again */
966                 g_signal_handler_block(win->widget, win->char_input_keypress_handler);
967
968                 /* Insert the forced input into the window */
969                 gtk_entry_set_text(GTK_ENTRY(win->input_entry), text);
970                 chars_written = finish_text_grid_line_input(win, TRUE);
971         }
972         gdk_threads_leave();
973
974         event->type = evtype_LineInput;
975         event->win = win;
976         event->val1 = chars_written;
977         event->val2 = 0;
978 }
979
980 /*** Internal function: cancels any pending input requests on the window and presents a warning if not INPUT_REQUEST_NONE ***/
981 void
982 cancel_old_input_request(winid_t win)
983 {
984         switch(win->input_request_type) {
985         case INPUT_REQUEST_NONE:
986                 break; /* All is well */
987         case INPUT_REQUEST_CHARACTER:
988         case INPUT_REQUEST_CHARACTER_UNICODE:
989                 glk_cancel_char_event(win);
990                 WARNING("Cancelling pending char event");
991                 break;
992         case INPUT_REQUEST_LINE:
993         case INPUT_REQUEST_LINE_UNICODE:
994                 glk_cancel_line_event(win, NULL);
995                 WARNING("Cancelling pending line event");
996                 break;
997         default:
998                 WARNING("Could not cancel pending input request: unknown input request");
999         }
1000 }
1001
1002 /**
1003  * glk_set_echo_line_event:
1004  * @win: The window in which to change the echoing behavior.
1005  * @val: Zero to turn off echoing, nonzero for normal echoing.
1006  *
1007  * Normally, after line input is completed or cancelled in a buffer window, the
1008  * library ensures that the complete input line (or its latest state, after
1009  * cancelling) is displayed at the end of the buffer, followed by a newline.
1010  * This call allows you to suppress this behavior. If the @val argument is zero,
1011  * all <emphasis>subsequent</emphasis> line input requests in the given window
1012  * will leave the buffer unchanged after the input is completed or cancelled;
1013  * the player's input will not be printed. If @val is nonzero, subsequent input
1014  * requests will have the normal printing behavior.
1015  *
1016  * <note><para>
1017  *   Note that this feature is unrelated to the window's echo stream.
1018  * </para></note>
1019  *
1020  * If you turn off line input echoing, you can reproduce the standard input
1021  * behavior by following each line input event (or line input cancellation) by
1022  * printing the input line, in the Input style, followed by a newline in the
1023  * original style.
1024  *
1025  * The glk_set_echo_line_event() does not affect a pending line input request.
1026  * It also has no effect in non-buffer windows.
1027  * <note><para>
1028  *   In a grid window, the game can overwrite the input area at will, so there
1029  *   is no need for this distinction.
1030  * </para></note>
1031  *
1032  * Not all libraries support this feature. You can test for it with
1033  * %gestalt_LineInputEcho.
1034  */
1035 void
1036 glk_set_echo_line_event(winid_t win, glui32 val)
1037 {
1038         VALID_WINDOW(win, return);
1039
1040         if(win->type != wintype_TextBuffer)
1041                 return; /* Quietly do nothing */
1042
1043         win->echo_line_input = val? TRUE : FALSE;
1044 }
1045
1046 /* Internal function to convert from a Glk keycode to a GDK keyval. */
1047 static unsigned
1048 keycode_to_gdk_keyval(glui32 keycode)
1049 {
1050         switch (keycode)
1051         {
1052                 case keycode_Left:
1053                         return GDK_Left;
1054                 case keycode_Right:
1055                         return GDK_Right;
1056                 case keycode_Up:
1057                         return GDK_Up;
1058                 case keycode_Down:
1059                         return GDK_Down;
1060                 case keycode_Return:
1061                         return GDK_Return;
1062                 case keycode_Delete:
1063                         return GDK_Delete;
1064                 case keycode_Escape:
1065                         return GDK_Escape;
1066                 case keycode_Tab:
1067                         return GDK_Tab;
1068                 case keycode_PageUp:
1069                         return GDK_Page_Up;
1070                 case keycode_PageDown:
1071                         return GDK_Page_Down;
1072                 case keycode_Home:
1073                         return GDK_Home;
1074                 case keycode_End:
1075                         return GDK_End;
1076                 case keycode_Func1:
1077                         return GDK_F1;
1078                 case keycode_Func2:
1079                         return GDK_F2;
1080                 case keycode_Func3:
1081                         return GDK_F3;
1082                 case keycode_Func4:
1083                         return GDK_F4;
1084                 case keycode_Func5:
1085                         return GDK_F5;
1086                 case keycode_Func6:
1087                         return GDK_F6;
1088                 case keycode_Func7:
1089                         return GDK_F7;
1090                 case keycode_Func8:
1091                         return GDK_F8;
1092                 case keycode_Func9:
1093                         return GDK_F9;
1094                 case keycode_Func10:
1095                         return GDK_F10;
1096                 case keycode_Func11:
1097                         return GDK_F11;
1098                 case keycode_Func12:
1099                         return GDK_F12;
1100                 case keycode_Erase:
1101                         return GDK_BackSpace;
1102         }
1103         unsigned keyval = gdk_unicode_to_keyval(keycode);
1104         if(keyval < 0x01000000) /* magic number meaning illegal unicode point */
1105                 return keyval;
1106         return 0;
1107 }
1108
1109 /* Internal function to decide whether @keycode is a valid line terminator. */
1110 gboolean
1111 is_valid_line_terminator(glui32 keycode)
1112 {
1113         switch(keycode) {
1114                 case keycode_Escape:
1115                 case keycode_Func1:
1116                 case keycode_Func2:
1117                 case keycode_Func3:
1118                 case keycode_Func4:
1119                 case keycode_Func5:
1120                 case keycode_Func6:
1121                 case keycode_Func7:
1122                 case keycode_Func8:
1123                 case keycode_Func9:
1124                 case keycode_Func10:
1125                 case keycode_Func11:
1126                 case keycode_Func12:
1127                         return TRUE;
1128         }
1129         return FALSE;
1130 }
1131
1132 /**
1133  * glk_set_terminators_line_event:
1134  * @win: The window for which to set the line input terminator keys.
1135  * @keycodes: An array of <code>keycode_</code> constants, of length @count.
1136  * @count: The array length of @keycodes.
1137  *
1138  * It is possible to request that other keystrokes complete line input as well.
1139  * (This allows a game to intercept function keys or other special keys during
1140  * line input.) To do this, call glk_set_terminators_line_event(), and pass an
1141  * array of @count keycodes. These must all be special keycodes (see <link
1142  * linkend="chimara-Character-Input">Character Input</link>). Do not include
1143  * regular printable characters in the array, nor %keycode_Return (which
1144  * represents the default <keycap>enter</keycap> key and will always be
1145  * recognized). To return to the default behavior, pass a %NULL or empty array.
1146  *
1147  * The glk_set_terminators_line_event() affects <emphasis>subsequent</emphasis>
1148  * line input requests in the given window. It does not affect a pending line
1149  * input request.
1150  *
1151  * <note><para>
1152  *   This distinction makes life easier for interpreters that set up UI
1153  *   callbacks only at the start of input.
1154  * </para></note>
1155  *
1156  * A library may not support this feature; if it does, it may not support all
1157  * special keys as terminators. (Some keystrokes are reserved for OS or
1158  * interpreter control.) You can test for this with %gestalt_LineTerminators and
1159  * %gestalt_LineTerminatorKey.
1160  */
1161 void
1162 glk_set_terminators_line_event(winid_t win, glui32 *keycodes, glui32 count)
1163 {
1164         VALID_WINDOW(win, return);
1165
1166         g_slist_free(win->extra_line_terminators);
1167         win->extra_line_terminators = NULL;
1168
1169         if(keycodes == NULL || count == 0)
1170                 return;
1171
1172         int i;
1173         for(i = 0; i < count; i++)
1174         {
1175                 unsigned key = keycode_to_gdk_keyval(keycodes[i]);
1176                 if(is_valid_line_terminator(keycodes[i]))
1177                         win->extra_line_terminators = g_slist_prepend(win->extra_line_terminators, GUINT_TO_POINTER(key));
1178                 else
1179                    WARNING_S("Ignoring invalid line terminator", gdk_keyval_name(key));
1180         }
1181 }