diff options
Diffstat (limited to 'contrib/texinfo/info/display.c')
| -rw-r--r-- | contrib/texinfo/info/display.c | 502 |
1 files changed, 249 insertions, 253 deletions
diff --git a/contrib/texinfo/info/display.c b/contrib/texinfo/info/display.c index 0194afa..3f2abe3 100644 --- a/contrib/texinfo/info/display.c +++ b/contrib/texinfo/info/display.c @@ -1,9 +1,7 @@ -/* display.c -- How to display Info windows. */ +/* display.c -- How to display Info windows. + $Id: display.c,v 1.6 1997/07/24 21:13:27 karl Exp $ -/* This file is part of GNU Info, a program for reading online documentation - stored in Info format. - - Copyright (C) 1993 Free Software Foundation, Inc. + Copyright (C) 1993, 97 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -21,10 +19,7 @@ Written by Brian Fox (bfox@ai.mit.edu). */ -#include <stdio.h> -#include <ctype.h> -#include <sys/types.h> -#include <sys/stat.h> +#include "info.h" #include "display.h" extern int info_any_buffered_input_p (); /* Found in session.c. */ @@ -57,7 +52,7 @@ display_clear_display (display) register int i; register DISPLAY_LINE *display_line; - for (i = 0; display_line = display[i]; i++) + for (i = 0; (display_line = display[i]); i++) { display[i]->text[0] = '\0'; display[i]->textlen = 0; @@ -83,13 +78,13 @@ display_update_display (window) { /* Only re-display visible windows which need updating. */ if (((win->flags & W_WindowVisible) == 0) || - ((win->flags & W_UpdateWindow) == 0) || - (win->height == 0)) - continue; + ((win->flags & W_UpdateWindow) == 0) || + (win->height == 0)) + continue; display_update_one_window (win); if (display_was_interrupted_p) - break; + break; } /* Always update the echo area. */ @@ -102,12 +97,12 @@ void display_update_one_window (win) WINDOW *win; { - register char *nodetext; /* Current character to display. */ + register char *nodetext; /* Current character to display. */ register char *last_node_char; /* Position of the last character in node. */ - register int i; /* General use index. */ - char *printed_line; /* Buffer for a printed line. */ - int pl_index = 0; /* Index into PRINTED_LINE. */ - int line_index = 0; /* Number of lines done so far. */ + register int i; /* General use index. */ + char *printed_line; /* Buffer for a printed line. */ + int pl_index = 0; /* Index into PRINTED_LINE. */ + int line_index = 0; /* Number of lines done so far. */ DISPLAY_LINE **display = the_display; /* If display is inhibited, that counts as an interrupted display. */ @@ -142,165 +137,165 @@ display_update_one_window (win) int replen; if (isprint (*nodetext)) - { - rep_temp[0] = *nodetext; - replen = 1; - rep_temp[1] = '\0'; - rep = rep_temp; - } + { + rep_temp[0] = *nodetext; + replen = 1; + rep_temp[1] = '\0'; + rep = rep_temp; + } else - { - if (*nodetext == '\r' || *nodetext == '\n') - { - replen = win->width - pl_index; - } - else - { - rep = printed_representation (*nodetext, pl_index); - replen = strlen (rep); - } - } + { + if (*nodetext == '\r' || *nodetext == '\n') + { + replen = win->width - pl_index; + } + else + { + rep = printed_representation (*nodetext, pl_index); + replen = strlen (rep); + } + } /* If this character can be printed without passing the width of - the line, then stuff it into the line. */ + the line, then stuff it into the line. */ if (replen + pl_index < win->width) - { - /* Optimize if possible. */ - if (replen == 1) - { - printed_line[pl_index++] = *rep; - } - else - { - for (i = 0; i < replen; i++) - printed_line[pl_index++] = rep[i]; - } - } + { + /* Optimize if possible. */ + if (replen == 1) + { + printed_line[pl_index++] = *rep; + } + else + { + for (i = 0; i < replen; i++) + printed_line[pl_index++] = rep[i]; + } + } else - { - DISPLAY_LINE *entry; - - /* If this character cannot be printed in this line, we have - found the end of this line as it would appear on the screen. - Carefully print the end of the line, and then compare. */ - if (*nodetext == '\n' || *nodetext == '\r' || *nodetext == '\t') - { - printed_line[pl_index] = '\0'; - rep_carried_over = (char *)NULL; - } - else - { - /* The printed representation of this character extends into - the next line. Remember the offset of the last character - printed out of REP so that we can carry the character over - to the next line. */ - for (i = 0; pl_index < (win->width - 1);) - printed_line[pl_index++] = rep[i++]; - - rep_carried_over = rep + i; - - /* If printing the last character in this window couldn't - possibly cause the screen to scroll, place a backslash - in the rightmost column. */ - if (1 + line_index + win->first_row < the_screen->height) - { - if (win->flags & W_NoWrap) - printed_line[pl_index++] = '$'; - else - printed_line[pl_index++] = '\\'; - } - printed_line[pl_index] = '\0'; - } - - /* We have the exact line as it should appear on the screen. - Check to see if this line matches the one already appearing - on the screen. */ - entry = display[line_index + win->first_row]; - - /* If the screen line is inversed, then we have to clear - the line from the screen first. Why, I don't know. */ - if (entry->inverse) - { - terminal_goto_xy (0, line_index + win->first_row); - terminal_clear_to_eol (); - entry->inverse = 0; - entry->text[0] = '\0'; - entry->textlen = 0; - } - - /* Find the offset where these lines differ. */ - for (i = 0; i < pl_index; i++) - if (printed_line[i] != entry->text[i]) - break; - - /* If the lines are not the same length, or if they differed - at all, we must do some redrawing. */ - if ((i != pl_index) || (pl_index != entry->textlen)) - { - /* Move to the proper point on the terminal. */ - terminal_goto_xy (i, line_index + win->first_row); - - /* If there is any text to print, print it. */ - if (i != pl_index) - terminal_put_text (printed_line + i); - - /* If the printed text didn't extend all the way to the edge - of the window, and text was appearing between here and the - edge of the window, clear from here to the end of the line. */ - if ((pl_index < win->width && pl_index < entry->textlen) || - (entry->inverse)) - terminal_clear_to_eol (); - - fflush (stdout); - - /* Update the display text buffer. */ - strcpy (entry->text + i, printed_line + i); - entry->textlen = pl_index; - - /* Lines showing node text are not in inverse. Only modelines - have that distinction. */ - entry->inverse = 0; - } - - /* We have done at least one line. Increment our screen line - index, and check against the bottom of the window. */ - if (++line_index == win->height) - break; - - /* A line has been displayed, and the screen reflects that state. - If there is typeahead pending, then let that typeahead be read - now, instead of continuing with the display. */ - if (info_any_buffered_input_p ()) - { - free (printed_line); - display_was_interrupted_p = 1; - return; - } - - /* Reset PL_INDEX to the start of the line. */ - pl_index = 0; - - /* If there are characters from REP left to print, stuff them - into the buffer now. */ - if (rep_carried_over) - for (; rep[pl_index]; pl_index++) - printed_line[pl_index] = rep[pl_index]; - - /* If this window has chosen not to wrap lines, skip to the end - of the physical line in the buffer, and start a new line here. */ - if (pl_index && (win->flags & W_NoWrap)) - { - char *begin; - - pl_index = 0; - printed_line[0] = '\0'; - - begin = nodetext; - - while ((nodetext < last_node_char) && (*nodetext != '\n')) - nodetext++; - } - } + { + DISPLAY_LINE *entry; + + /* If this character cannot be printed in this line, we have + found the end of this line as it would appear on the screen. + Carefully print the end of the line, and then compare. */ + if (*nodetext == '\n' || *nodetext == '\r' || *nodetext == '\t') + { + printed_line[pl_index] = '\0'; + rep_carried_over = (char *)NULL; + } + else + { + /* The printed representation of this character extends into + the next line. Remember the offset of the last character + printed out of REP so that we can carry the character over + to the next line. */ + for (i = 0; pl_index < (win->width - 1);) + printed_line[pl_index++] = rep[i++]; + + rep_carried_over = rep + i; + + /* If printing the last character in this window couldn't + possibly cause the screen to scroll, place a backslash + in the rightmost column. */ + if (1 + line_index + win->first_row < the_screen->height) + { + if (win->flags & W_NoWrap) + printed_line[pl_index++] = '$'; + else + printed_line[pl_index++] = '\\'; + } + printed_line[pl_index] = '\0'; + } + + /* We have the exact line as it should appear on the screen. + Check to see if this line matches the one already appearing + on the screen. */ + entry = display[line_index + win->first_row]; + + /* If the screen line is inversed, then we have to clear + the line from the screen first. Why, I don't know. */ + if (entry->inverse) + { + terminal_goto_xy (0, line_index + win->first_row); + terminal_clear_to_eol (); + entry->inverse = 0; + entry->text[0] = '\0'; + entry->textlen = 0; + } + + /* Find the offset where these lines differ. */ + for (i = 0; i < pl_index; i++) + if (printed_line[i] != entry->text[i]) + break; + + /* If the lines are not the same length, or if they differed + at all, we must do some redrawing. */ + if ((i != pl_index) || (pl_index != entry->textlen)) + { + /* Move to the proper point on the terminal. */ + terminal_goto_xy (i, line_index + win->first_row); + + /* If there is any text to print, print it. */ + if (i != pl_index) + terminal_put_text (printed_line + i); + + /* If the printed text didn't extend all the way to the edge + of the window, and text was appearing between here and the + edge of the window, clear from here to the end of the line. */ + if ((pl_index < win->width && pl_index < entry->textlen) || + (entry->inverse)) + terminal_clear_to_eol (); + + fflush (stdout); + + /* Update the display text buffer. */ + strcpy (entry->text + i, printed_line + i); + entry->textlen = pl_index; + + /* Lines showing node text are not in inverse. Only modelines + have that distinction. */ + entry->inverse = 0; + } + + /* We have done at least one line. Increment our screen line + index, and check against the bottom of the window. */ + if (++line_index == win->height) + break; + + /* A line has been displayed, and the screen reflects that state. + If there is typeahead pending, then let that typeahead be read + now, instead of continuing with the display. */ + if (info_any_buffered_input_p ()) + { + free (printed_line); + display_was_interrupted_p = 1; + return; + } + + /* Reset PL_INDEX to the start of the line. */ + pl_index = 0; + + /* If there are characters from REP left to print, stuff them + into the buffer now. */ + if (rep_carried_over) + for (; rep[pl_index]; pl_index++) + printed_line[pl_index] = rep[pl_index]; + + /* If this window has chosen not to wrap lines, skip to the end + of the physical line in the buffer, and start a new line here. */ + if (pl_index && (win->flags & W_NoWrap)) + { + char *begin; + + pl_index = 0; + printed_line[0] = '\0'; + + begin = nodetext; + + while ((nodetext < last_node_char) && (*nodetext != '\n')) + nodetext++; + } + } } done_with_node_display: @@ -313,13 +308,13 @@ display_update_one_window (win) /* If this line has text on it then make it go away. */ if (entry && entry->textlen) - { - entry->textlen = 0; - entry->text[0] = '\0'; + { + entry->textlen = 0; + entry->text[0] = '\0'; - terminal_goto_xy (0, line_index + win->first_row); - terminal_clear_to_eol (); - } + terminal_goto_xy (0, line_index + win->first_row); + terminal_clear_to_eol (); + } } /* Finally, if this window has a modeline it might need to be redisplayed. @@ -331,19 +326,19 @@ display_update_one_window (win) line_index = win->first_row + win->height; /* This display line must both be in inverse, and have the same - contents. */ + contents. */ if ((!display[line_index]->inverse) || - (strcmp (display[line_index]->text, win->modeline) != 0)) - { - terminal_goto_xy (0, line_index); - terminal_begin_inverse (); - terminal_put_text (win->modeline); - terminal_end_inverse (); - strcpy (display[line_index]->text, win->modeline); - display[line_index]->inverse = 1; - display[line_index]->textlen = strlen (win->modeline); - fflush (stdout); - } + (strcmp (display[line_index]->text, win->modeline) != 0)) + { + terminal_goto_xy (0, line_index); + terminal_begin_inverse (); + terminal_put_text (win->modeline); + terminal_end_inverse (); + strcpy (display[line_index]->text, win->modeline); + display[line_index]->inverse = 1; + display[line_index]->textlen = strlen (win->modeline); + fflush (stdout); + } } /* Okay, this window doesn't need updating anymore. */ @@ -387,40 +382,40 @@ display_scroll_display (start, end, amount) /* Shift the lines to scroll right into place. */ for (i = 0; i < (end - start); i++) - { - temp = the_display[last - i]; - the_display[last - i] = the_display[end - i]; - the_display[end - i] = temp; - } + { + temp = the_display[last - i]; + the_display[last - i] = the_display[end - i]; + the_display[end - i] = temp; + } /* The lines have been shifted down in the buffer. Clear all of the - lines that were vacated. */ + lines that were vacated. */ for (i = start; i != (start + amount); i++) - { - the_display[i]->text[0] = '\0'; - the_display[i]->textlen = 0; - the_display[i]->inverse = 0; - } + { + the_display[i]->text[0] = '\0'; + the_display[i]->textlen = 0; + the_display[i]->inverse = 0; + } } if (amount < 0) { last = start + amount; for (i = 0; i < (end - start); i++) - { - temp = the_display[last + i]; - the_display[last + i] = the_display[start + i]; - the_display[start + i] = temp; - } + { + temp = the_display[last + i]; + the_display[last + i] = the_display[start + i]; + the_display[start + i] = temp; + } /* The lines have been shifted up in the buffer. Clear all of the - lines that are left over. */ + lines that are left over. */ for (i = end + amount; i != end; i++) - { - the_display[i]->text[0] = '\0'; - the_display[i]->textlen = 0; - the_display[i]->inverse = 0; - } + { + the_display[i]->text[0] = '\0'; + the_display[i]->textlen = 0; + the_display[i]->inverse = 0; + } } } @@ -434,9 +429,9 @@ display_scroll_line_starts (window, old_pagetop, old_starts, old_count) int old_pagetop, old_count; char **old_starts; { - register int i, old, new; /* Indices into the line starts arrays. */ - int last_new, last_old; /* Index of the last visible line. */ - int old_first, new_first; /* Index of the first changed line. */ + register int i, old, new; /* Indices into the line starts arrays. */ + int last_new, last_old; /* Index of the last visible line. */ + int old_first, new_first; /* Index of the first changed line. */ int unchanged_at_top = 0; int already_scrolled = 0; @@ -466,39 +461,39 @@ display_scroll_line_starts (window, old_pagetop, old_starts, old_count) for (old = old_first + unchanged_at_top; old < last_old; old++) { for (new = new_first; new < last_new; new++) - if (old_starts[old] == window->line_starts[new]) - { - /* Find the extent of the matching lines. */ - for (i = 0; (old + i) < last_old; i++) - if (old_starts[old + i] != window->line_starts[new + i]) - break; - - /* Scroll these lines if there are enough of them. */ - { - int start, end, amount; - - start = (window->first_row - + ((old + already_scrolled) - old_pagetop)); - amount = new - (old + already_scrolled); - end = window->first_row + window->height; - - /* If we are shifting the block of lines down, then the last - AMOUNT lines will become invisible. Thus, don't bother - scrolling them. */ - if (amount > 0) - end -= amount; - - if ((end - start) > 0) - { - display_scroll_display (start, end, amount); - - /* Some lines have been scrolled. Simulate the scrolling - by offsetting the value of the old index. */ - old += i; - already_scrolled += amount; - } - } - } + if (old_starts[old] == window->line_starts[new]) + { + /* Find the extent of the matching lines. */ + for (i = 0; (old + i) < last_old; i++) + if (old_starts[old + i] != window->line_starts[new + i]) + break; + + /* Scroll these lines if there are enough of them. */ + { + int start, end, amount; + + start = (window->first_row + + ((old + already_scrolled) - old_pagetop)); + amount = new - (old + already_scrolled); + end = window->first_row + window->height; + + /* If we are shifting the block of lines down, then the last + AMOUNT lines will become invisible. Thus, don't bother + scrolling them. */ + if (amount > 0) + end -= amount; + + if ((end - start) > 0) + { + display_scroll_display (start, end, amount); + + /* Some lines have been scrolled. Simulate the scrolling + by offsetting the value of the old index. */ + old += i; + already_scrolled += amount; + } + } + } } } @@ -512,12 +507,13 @@ display_cursor_at_point (window) vpos = window_line_of_point (window) - window->pagetop + window->first_row; hpos = window_get_cursor_column (window); terminal_goto_xy (hpos, vpos); + fflush (stdout); } /* **************************************************************** */ -/* */ -/* Functions Static to this File */ -/* */ +/* */ +/* Functions Static to this File */ +/* */ /* **************************************************************** */ /* Make a DISPLAY_LINE ** with width and height. */ @@ -552,7 +548,7 @@ free_display (display) if (!display) return; - for (i = 0; display_line = display[i]; i++) + for (i = 0; (display_line = display[i]); i++) { free (display_line->text); free (display_line); |
