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Diffstat (limited to 'lib/libncurses/lib_scroll.c')
-rw-r--r--lib/libncurses/lib_scroll.c118
1 files changed, 73 insertions, 45 deletions
diff --git a/lib/libncurses/lib_scroll.c b/lib/libncurses/lib_scroll.c
index 03e71368f734..5dd55d673455 100644
--- a/lib/libncurses/lib_scroll.c
+++ b/lib/libncurses/lib_scroll.c
@@ -16,30 +16,30 @@
#include "curses.priv.h"
#include "terminfo.h"
-void scroll_window(WINDOW *win, int n, int regtop, int regbottom)
+void _nc_soft_scroll_window(WINDOW *win, int const n, short const top, short const bottom, chtype blank)
{
int line, i;
chtype *ptr, *temp;
chtype **saved;
-chtype blank = _nc_background(win);
- saved = (chtype **)malloc(sizeof(chtype *) * abs(n));
+ saved = (chtype **)calloc(abs(n), sizeof(chtype *));
if (n < 0) {
/* save overwritten lines */
- for (i = 0; i < -n; i++)
- saved[i] = win->_line[regbottom-i];
+ for (i = 0; i < -n && bottom-i >= 0; i++)
+ saved[i] = win->_line[bottom-i];
/* shift n lines */
- for (line = regbottom; line >= regtop-n; line--)
+ for (line = bottom; line >= top-n && line >= 0; line--)
win->_line[line] = win->_line[line+n];
/* restore saved lines and blank them */
- for (i = 0, line = regtop; line < regtop-n; line++, i++) {
- win->_line[line] = saved[i];
+ for (i = 0, line = top; line < top-n && line <= win->_maxy; line++, i++) {
+ if (saved[i])
+ win->_line[line] = saved[i];
temp = win->_line[line];
for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
*ptr = blank;
@@ -47,47 +47,56 @@ chtype blank = _nc_background(win);
} else {
/* save overwritten lines */
- for (i = 0; i < n; i++)
- saved[i] = win->_line[regtop+i];
+ for (i = 0; i < n && top+i <= win->_maxy; i++)
+ saved[i] = win->_line[top+i];
/* shift n lines */
- for (line = regtop; line <= regbottom-n; line++)
+ for (line = top; line <= bottom-n && line+n <= win->_maxy; line++)
win->_line[line] = win->_line[line+n];
/* restore saved lines and blank them */
- for (i = 0, line = regbottom; line > regbottom - n; line--, i++) {
- win->_line[line] = saved[i];
+ for (i = 0, line = bottom; line > bottom - n && line >= 0; line--, i++) {
+ if (saved[i])
+ win->_line[line] = saved[i];
temp = win->_line[line];
for (ptr = temp; ptr - temp <= win->_maxx; ptr++)
*ptr = blank;
}
}
-
+ /* touchline(win, top, bottom-top+1); */ /* not yet */
free(saved);
}
-int
-wscrl(WINDOW *win, int n)
+void _nc_scroll_window(WINDOW *win, int n, short const top, short const bottom, chtype blank)
{
int physical = FALSE;
int i;
- T(("wscrl(%x,%d) called", win, n));
+ if (top == bottom) {
+ int sy, sx;
- if (! win->_scroll)
- return ERR;
+ getyx(win, sy, sx);
+ win->_curx = 0;
+ win->_cury = top;
+ wclrtoeol(win);
+ win->_curx = sx;
+ win->_cury = sy;
+ return;
+ }
- if (n == 0)
- return OK;
+ if (n > lines)
+ n = lines;
+ else if (-n > lines)
+ n = -lines;
/* as an optimization, if the scrolling region is the entire screen
scroll the physical screen */
if ( win->_begx == 0 && win->_maxx == columns - 1
&& !memory_above && !memory_below
- && ((((win->_begy+win->_regtop == 0 && win->_begy+win->_regbottom == lines - 1)
+ && ((((win->_begy+top == 0 && win->_begy+bottom == lines - 1)
|| change_scroll_region)
&& ( (n < 0 && (parm_rindex || scroll_reverse))
|| (n > 0 && (parm_index || scroll_forward))
@@ -97,28 +106,28 @@ int i;
)
)
)
- physical = TRUE;
+ physical = TRUE;
if (physical == TRUE) {
wrefresh(win);
- scroll_window(curscr, n, win->_begy+win->_regtop, win->_begy+win->_regbottom);
- scroll_window(newscr, n, win->_begy+win->_regtop, win->_begy+win->_regbottom);
+ _nc_soft_scroll_window(curscr, n, win->_begy+top, win->_begy+bottom, blank);
+ _nc_soft_scroll_window(newscr, n, win->_begy+top, win->_begy+bottom, blank);
}
- scroll_window(win, n, win->_regtop, win->_regbottom);
+ _nc_soft_scroll_window(win, n, top, bottom, blank);
if (physical == TRUE) {
if (n < 0) {
- if ( (( win->_begy+win->_regtop == 0
- && win->_begy+win->_regbottom == lines - 1)
+ if ( (( win->_begy+top == 0
+ && win->_begy+bottom == lines - 1)
|| change_scroll_region)
&& (parm_rindex || scroll_reverse)
) {
if (change_scroll_region &&
- (win->_begy+win->_regtop != 0 || win->_begy+win->_regbottom != lines - 1)
+ (win->_begy+top != 0 || win->_begy+bottom != lines - 1)
)
- putp(tparm(change_scroll_region, win->_begy+win->_regtop, win->_begy+win->_regbottom));
+ putp(tparm(change_scroll_region, win->_begy+top, win->_begy+bottom));
i = abs(n);
- mvcur(-1, -1, win->_begy+win->_regtop, 0);
+ mvcur(-1, -1, win->_begy+top, 0);
if (parm_rindex) {
putp(tparm(parm_rindex, i));
} else if (scroll_reverse) {
@@ -126,13 +135,13 @@ int i;
putp(scroll_reverse);
}
if (change_scroll_region &&
- (win->_begy+win->_regtop != 0 || win->_begy+win->_regbottom != lines - 1)
+ (win->_begy+top != 0 || win->_begy+bottom != lines - 1)
)
putp(tparm(change_scroll_region, 0, lines-1));
} else {
i = abs(n);
- if (win->_begy+win->_regbottom < lines - 1) {
- mvcur(-1, -1, win->_begy+win->_regbottom, 0);
+ if (win->_begy+bottom < lines - 1) {
+ mvcur(-1, -1, win->_begy+bottom, 0);
if (parm_delete_line) {
putp(tparm(parm_delete_line, i));
} else if (delete_line) {
@@ -141,7 +150,7 @@ int i;
i = abs(n);
}
}
- mvcur(-1, -1, win->_begy+win->_regtop, 0);
+ mvcur(-1, -1, win->_begy+top, 0);
if (parm_insert_line) {
putp(tparm(parm_insert_line, i));
} else if (insert_line) {
@@ -150,16 +159,16 @@ int i;
}
}
} else {
- if ( (( win->_begy+win->_regtop == 0
- && win->_begy+win->_regbottom == lines - 1)
+ if ( (( win->_begy+top == 0
+ && win->_begy+bottom == lines - 1)
|| change_scroll_region)
&& (parm_index || scroll_forward)
) {
if (change_scroll_region &&
- (win->_begy+win->_regtop != 0 || win->_begy+win->_regbottom != lines - 1)
+ (win->_begy+top != 0 || win->_begy+bottom != lines - 1)
)
- putp(tparm(change_scroll_region, win->_begy+win->_regtop, win->_begy+win->_regbottom));
- mvcur(-1, -1, win->_begy+win->_regbottom, 0);
+ putp(tparm(change_scroll_region, win->_begy+top, win->_begy+bottom));
+ mvcur(-1, -1, win->_begy+bottom, 0);
if (parm_index) {
putp(tparm(parm_index, n));
} else if (scroll_forward) {
@@ -168,11 +177,11 @@ int i;
putp(scroll_forward);
}
if (change_scroll_region &&
- (win->_begy+win->_regtop != 0 || win->_begy+win->_regbottom != lines - 1)
+ (win->_begy+top != 0 || win->_begy+bottom != lines - 1)
)
putp(tparm(change_scroll_region, 0, lines-1));
} else {
- mvcur(-1, -1, win->_begy+win->_regtop, 0);
+ mvcur(-1, -1, win->_begy+top, 0);
if (parm_delete_line) {
putp(tparm(parm_delete_line, n));
} else if (delete_line) {
@@ -180,8 +189,8 @@ int i;
while (i--)
putp(delete_line);
}
- if (win->_begy+win->_regbottom < lines - 1) {
- mvcur(win->_begy+win->_regtop, 0, win->_begy+win->_regbottom, 0);
+ if (win->_begy+bottom < lines - 1) {
+ mvcur(win->_begy+top, 0, win->_begy+bottom, 0);
if (parm_insert_line) {
putp(tparm(parm_insert_line, n));
} else if (insert_line) {
@@ -195,7 +204,26 @@ int i;
mvcur(-1, -1, win->_begy+win->_cury, win->_begx+win->_curx);
} else
- touchline(win, win->_regtop, win->_regbottom - win->_regtop + 1);
+ touchline(win, top, bottom - top + 1);
+}
+
+
+int
+wscrl(WINDOW *win, int n)
+{
+ T(("wscrl(%x,%d) called", win, n));
+
+ if (!win || !win->_scroll)
+ return ERR;
+
+ if (n == 0)
+ return OK;
+
+ if ((n > (win->_regbottom - win->_regtop)) ||
+ (-n > (win->_regbottom - win->_regtop)))
+ return ERR;
+
+ _nc_scroll_window(win, n, win->_regtop, win->_regbottom, _nc_background(win));
return OK;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 07:22:00 +0000