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-rw-r--r--mdk-stage1/slang/slscroll.c450
1 files changed, 0 insertions, 450 deletions
diff --git a/mdk-stage1/slang/slscroll.c b/mdk-stage1/slang/slscroll.c
deleted file mode 100644
index 358296116..000000000
--- a/mdk-stage1/slang/slscroll.c
+++ /dev/null
@@ -1,450 +0,0 @@
-/* SLang Scrolling Window Routines */
-/* Copyright (c) 1996, 1999, 2001 John E. Davis
- * This file is part of the S-Lang library.
- *
- * You may distribute under the terms of either the GNU General Public
- * License or the Perl Artistic License.
- */
-
-#include "slinclud.h"
-
-#include "slang.h"
-#include "_slang.h"
-
-static void find_window_bottom (SLscroll_Window_Type *win)
-{
- unsigned int nrows;
- unsigned int hidden_mask;
- SLscroll_Type *bot, *cline, *last_bot;
- unsigned int row;
-
- nrows = win->nrows;
- hidden_mask = win->hidden_mask;
- cline = win->current_line;
-
- win->window_row = row = 0;
- last_bot = bot = win->top_window_line;
-
- while (row < nrows)
- {
- if (bot == cline)
- win->window_row = row;
-
- last_bot = bot;
-
- if (bot == NULL)
- break;
-
- bot = bot->next;
-
- if (hidden_mask)
- {
- while ((bot != NULL) && (bot->flags & hidden_mask))
- bot = bot->next;
- }
-
- row++;
- }
-
- win->bot_window_line = last_bot;
-}
-
-static int find_top_to_recenter (SLscroll_Window_Type *win)
-{
- unsigned int nrows;
- unsigned int hidden_mask;
- SLscroll_Type *prev, *last_prev, *cline;
-
- nrows = win->nrows;
- cline = win->current_line;
- hidden_mask = win->hidden_mask;
-
- nrows = nrows / 2;
-
- last_prev = prev = cline;
-
- while (nrows && (prev != NULL))
- {
- nrows--;
- last_prev = prev;
- do
- {
- prev = prev->prev;
- }
- while (hidden_mask
- && (prev != NULL)
- && (prev->flags & hidden_mask));
- }
-
- if (prev == NULL) prev = last_prev;
-
- win->top_window_line = prev;
- find_window_bottom (win);
-
- return 0;
-}
-
-#define HAS_BORDER_CODE 1
-int SLscroll_find_top (SLscroll_Window_Type *win)
-{
- unsigned int i;
- SLscroll_Type *cline, *prev, *next;
- SLscroll_Type *top_window_line;
- unsigned int nrows;
- unsigned int hidden_mask;
- int scroll_mode;
- unsigned int border;
-
- cline = win->current_line;
- nrows = win->nrows;
- scroll_mode = win->cannot_scroll;
- border = win->border;
- if (scroll_mode == 2)
- border = 0;
-
- if ((cline == NULL) || (nrows <= 1))
- {
- win->top_window_line = cline;
- find_window_bottom (win);
- return 0;
- }
-
- hidden_mask = win->hidden_mask;
-
- /* Note: top_window_line might be a bogus pointer. This means that I cannot
- * access it unless it really corresponds to a pointer in the buffer.
- */
- top_window_line = win->top_window_line;
-
- if (top_window_line == NULL)
- return find_top_to_recenter (win);
-
- /* Chances are that the current line is visible in the window. This means
- * that the top window line should be above it.
- */
- prev = cline;
-
- i = 0;
-
- while ((i < nrows) && (prev != NULL))
- {
- if (prev == top_window_line)
- {
- SLscroll_Type *twl = top_window_line;
- int dir = 0;
-
- if (i < border) dir = -1; else if (i + border >= nrows) dir = 1;
-
- if (dir) while (border)
- {
- if (dir < 0) twl = twl->prev;
- else twl = twl->next;
-
- if (twl == NULL)
- {
- twl = top_window_line;
- break;
- }
- if ((hidden_mask == 0)
- || (0 == (twl->flags & hidden_mask)))
- border--;
- }
-
- win->top_window_line = twl;
- find_window_bottom (win);
- return 0;
- }
-
- do
- {
- prev = prev->prev;
- }
- while (hidden_mask
- && (prev != NULL)
- && (prev->flags & hidden_mask));
- i++;
- }
-
- /* Now check the borders of the window. Perhaps the current line lies
- * outsider the border by a line. Only do this if terminal can scroll.
- */
-
- if (scroll_mode == 1)
- return find_top_to_recenter (win);
- else if (scroll_mode == -1)
- scroll_mode = 0;
-
- next = cline->next;
- while (hidden_mask
- && (next != NULL)
- && (next->flags & hidden_mask))
- next = next->next;
-
- if ((next != NULL)
- && (next == top_window_line))
- {
- /* The current line is one line above the window. This means user
- * has moved up past the top of the window. If scroll_mode is set
- * to scroll by pages, we need to do a page up.
- */
-
- win->top_window_line = cline;
- find_window_bottom (win);
-
- if (scroll_mode) return SLscroll_pageup (win);
-
- return 0;
- }
-
- prev = cline->prev;
-
- while (hidden_mask
- && (prev != NULL)
- && (prev->flags & hidden_mask))
- prev = prev->prev;
-
- if ((prev == NULL)
- || (prev != win->bot_window_line))
- return find_top_to_recenter (win);
-
- /* It looks like cline is below window by one line. See what line should
- * be at top to scroll it into view. Only do this unless we are scrolling
- * by pages.
- */
- if (scroll_mode)
- {
- win->top_window_line = cline;
- find_window_bottom (win);
- return 0;
- }
-
- i = 2;
- while ((i < nrows) && (prev != NULL))
- {
- do
- {
- prev = prev->prev;
- }
- while (hidden_mask
- && (prev != NULL)
- && (prev->flags & hidden_mask));
- i++;
- }
-
- if (prev != NULL)
- {
- win->top_window_line = prev;
- find_window_bottom (win);
- return 0;
- }
-
- return find_top_to_recenter (win);
-}
-
-int SLscroll_find_line_num (SLscroll_Window_Type *win)
-{
- SLscroll_Type *cline, *l;
- unsigned int n;
- unsigned int hidden_mask;
-
- if (win == NULL) return -1;
-
- hidden_mask = win->hidden_mask;
- cline = win->current_line;
-
- n = 1;
-
- l = win->lines;
- while (l != cline)
- {
- if ((hidden_mask == 0)
- || (0 == (l->flags & hidden_mask)))
- n++;
-
- l = l->next;
- }
-
- win->line_num = n;
- n--;
-
- while (l != NULL)
- {
- if ((hidden_mask == 0)
- || (0 == (l->flags & hidden_mask)))
- n++;
- l = l->next;
- }
- win->num_lines = n;
-
- return 0;
-}
-
-unsigned int SLscroll_next_n (SLscroll_Window_Type *win, unsigned int n)
-{
- unsigned int i;
- unsigned int hidden_mask;
- SLscroll_Type *l, *cline;
-
- if ((win == NULL)
- || (NULL == (cline = win->current_line)))
- return 0;
-
- hidden_mask = win->hidden_mask;
- l = cline;
- i = 0;
- while (i < n)
- {
- l = l->next;
- while (hidden_mask
- && (l != NULL) && (l->flags & hidden_mask))
- l = l->next;
-
- if (l == NULL)
- break;
-
- i++;
- cline = l;
- }
-
- win->current_line = cline;
- win->line_num += i;
- return i;
-}
-
-unsigned int SLscroll_prev_n (SLscroll_Window_Type *win, unsigned int n)
-{
- unsigned int i;
- unsigned int hidden_mask;
- SLscroll_Type *l, *cline;
-
- if ((win == NULL)
- || (NULL == (cline = win->current_line)))
- return 0;
-
- hidden_mask = win->hidden_mask;
- l = cline;
- i = 0;
- while (i < n)
- {
- l = l->prev;
- while (hidden_mask
- && (l != NULL) && (l->flags & hidden_mask))
- l = l->prev;
-
- if (l == NULL)
- break;
-
- i++;
- cline = l;
- }
-
- win->current_line = cline;
- win->line_num -= i;
- return i;
-}
-
-int SLscroll_pageup (SLscroll_Window_Type *win)
-{
- SLscroll_Type *l, *top;
- unsigned int nrows, hidden_mask;
- unsigned int n;
-
- if (win == NULL)
- return -1;
-
- (void) SLscroll_find_top (win);
-
- nrows = win->nrows;
-
- if ((NULL != (top = win->top_window_line))
- && (nrows > 2))
- {
- n = 0;
- hidden_mask = win->hidden_mask;
- l = win->current_line;
- while ((l != NULL) && (l != top))
- {
- l = l->prev;
- if ((hidden_mask == 0)
- || ((l != NULL) && (0 == (l->flags & hidden_mask))))
- n++;
- }
-
- if (l != NULL)
- {
- unsigned int save_line_num;
- int ret = 0;
-
- win->current_line = l;
- win->line_num -= n;
-
- /* Compute a new top/bottom header */
- save_line_num = win->line_num;
-
- if ((0 == SLscroll_prev_n (win, nrows - 1))
- && (n == 0))
- ret = -1;
-
- win->top_window_line = win->current_line;
- win->current_line = l;
- win->line_num = save_line_num;
-
- find_window_bottom (win);
- return ret;
- }
- }
-
- if (nrows < 2) nrows++;
- if (0 == SLscroll_prev_n (win, nrows - 1))
- return -1;
- return 0;
-}
-
-int SLscroll_pagedown (SLscroll_Window_Type *win)
-{
- SLscroll_Type *l, *bot;
- unsigned int nrows, hidden_mask;
- unsigned int n;
-
- if (win == NULL)
- return -1;
-
- (void) SLscroll_find_top (win);
-
- nrows = win->nrows;
-
- if ((NULL != (bot = win->bot_window_line))
- && (nrows > 2))
- {
- n = 0;
- hidden_mask = win->hidden_mask;
- l = win->current_line;
- while ((l != NULL) && (l != bot))
- {
- l = l->next;
- if ((hidden_mask == 0)
- || ((l != NULL) && (0 == (l->flags & hidden_mask))))
- n++;
- }
-
- if (l != NULL)
- {
- win->current_line = l;
- win->top_window_line = l;
- win->line_num += n;
-
- find_window_bottom (win);
-
- if (n || (bot != win->bot_window_line))
- return 0;
-
- return -1;
- }
- }
-
- if (nrows < 2) nrows++;
- if (0 == SLscroll_next_n (win, nrows - 1))
- return -1;
- return 0;
-}
-
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