curs_scroll: scroll, srcl, wscrl - scroll a curses window
int scroll(WINDOW *win);
int scrl(int n);
int wscrl(WINDOW *win, int n);
With the scroll routine, the window is scrolled up one line. This
involves moving the lines in the window data structure. As an
optimization, if the scrolling region of the window is the entire screen,
the physical screen is scrolled at the same time.
With the scrl and wscrl routines, for positive n scroll the window up n
lines (line i+n becomes i); otherwise scroll the window down n lines.
This involves moving the lines in the window character image structure.
The current cursor position is not changed.
For these functions to work, scrolling must be enabled via scrollok.
All routines return the integer ERR upon failure and an integer value
other than ERR upon successful completion.
The header file <curses.h> automatically includes the header files
<stdio.h> and <unctrl.h>.
Note that scrl and scroll may be macros.
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