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CentOS 7.0 - man page for curs_scroll (centos section 3X)

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curs_scroll(3X) 								  curs_scroll(3X)

       scroll, scrl, wscrl - scroll a curses window

       #include <curses.h>

       int scroll(WINDOW *win);
       int scrl(int n);
       int wscrl(WINDOW *win, int n);

       The  scroll routine scrolls the window 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 may be scrolled at the same time.

       For positive n, the scrl and wscrl routines 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  win-
       dow character image structure.  The current cursor position is not changed.

       For these functions to work, scrolling must be enabled via scrollok.

       These routines return ERR upon failure, and OK (SVr4 only specifies "an integer value oth-
       er than ERR") upon successful completion.

       X/Open defines no error conditions.

       This implementation returns an error if the window pointer is null, or if scrolling is not
       enabled in the window, e.g., with scrollok.

       Note that scrl and scroll may be macros.

       The  SVr4  documentation says that the optimization of physically scrolling immediately if
       the scroll region is the entire screen "is" performed, not "may be" performed.	This  im-
       plementation  deliberately does not guarantee that this will occur, to leave open the pos-
       sibility of smarter optimization of multiple scroll actions on the next update.

       Neither the SVr4 nor the XSI documentation specify whether the current attribute  or  cur-
       rent  color-pair  of blanks generated by the scroll function is zeroed.	Under this imple-
       mentation it is.

       The XSI Curses standard, Issue 4 describes these functions.

       curses(3X), curs_outopts(3X)

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