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+#include <curses.h>
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+#include <stddef.h>
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+#include <malloc.h>
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+#include "core.h"
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+
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+/** @file
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+ *
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+ * MuCurses windows instance functions
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+ *
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+ */
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+
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+/**
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+ * Delete a window
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+ *
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+ * @v *win pointer to window being deleted
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+ * @ret rc return status code
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+ */
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+int delwin ( WINDOW *win ) {
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+ if ( win == NULL )
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+ return ERR;
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+
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+ /* I think we should blank the region covered by the window -
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+ ncurses doesn't do this, but they have a buffer, so they
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+ may just be deleting from an offscreen context whereas we
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+ are guaranteed to be deleting something onscreen */
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+ wmove( win, 0, 0 );
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+ chtype killch = (chtype)' ';
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+ do {
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+ _wputch( win, killch, WRAP );
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+ } while ( win->curs_x + win->curs_y );
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+
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+ free( win );
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+
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+ wmove ( stdscr, 0, 0 );
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+
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+ return OK;
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+}
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+
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+/**
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+ * Create a new derived window
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+ *
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+ * @v parent parent window
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+ * @v nlines window height
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+ * @v ncols window width
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+ * @v begin_y window y origin (relative to parent)
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+ * @v begin_x window x origin (relative to parent)
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+ * @ret ptr return pointer to child window
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+ */
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+WINDOW *derwin ( WINDOW *parent, int nlines, int ncols,
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+ int begin_y, int begin_x ) {
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+ WINDOW *child;
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+ if ( parent == NULL )
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+ return NULL;
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+ if ( ( (unsigned)ncols > parent->width ) ||
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+ ( (unsigned)nlines > parent->height ) )
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+ return NULL;
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+ child = malloc( sizeof( WINDOW ) );
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+ child->ori_y = parent->ori_y + begin_y;
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+ child->ori_x = parent->ori_x + begin_x;
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+ child->height = nlines;
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+ child->width = ncols;
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+ child->parent = parent;
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+ child->scr = parent->scr;
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+ return child;
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+}
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+
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+/**
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+ * Create a duplicate of the specified window
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+ *
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+ * @v orig original window
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+ * @ret ptr pointer to duplicate window
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+ */
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+WINDOW *dupwin ( WINDOW *orig ) {
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+ WINDOW *copy;
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+ if ( orig == NULL )
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+ return NULL;
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+ copy = malloc( sizeof( WINDOW ) );
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+ copy->scr = orig->scr;
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+ copy->attrs = orig->attrs;
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+ copy->ori_y = orig->ori_y;
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+ copy->ori_x = orig->ori_x;
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+ copy->curs_y = orig->curs_y;
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+ copy->curs_x = orig->curs_x;
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+ copy->height = orig->height;
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+ copy->width = orig->width;
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+ return copy;
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+}
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+
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+/**
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+ * Move window origin to specified coordinates
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+ *
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+ * @v *win window to move
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+ * @v y Y position
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+ * @v x X position
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+ * @ret rc return status code
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+ */
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+int mvwin ( WINDOW *win, int y, int x ) {
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+ if ( win == NULL )
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+ return ERR;
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+ if ( ( ( (unsigned)y + win->height ) > LINES ) ||
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+ ( ( (unsigned)x + win->width ) > COLS ) )
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+ return ERR;
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+
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+ win->ori_y = y;
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+ win->ori_x = x;
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+
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+ return OK;
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+}
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+
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+/**
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+ * Create new WINDOW
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+ *
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+ * @v nlines number of lines
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+ * @v ncols number of columns
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+ * @v begin_y column origin
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+ * @v begin_x line origin
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+ * @ret *win return pointer to new window
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+ */
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+WINDOW *newwin ( int nlines, int ncols, int begin_y, int begin_x ) {
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+ WINDOW *win = malloc( sizeof(WINDOW) );
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+ if ( ( (unsigned)( begin_y + nlines ) > stdscr->height ) &&
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+ ( (unsigned)( begin_x + ncols ) > stdscr->width ) )
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+ return NULL;
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+ win->ori_y = begin_y;
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+ win->ori_x = begin_x;
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+ win->height = nlines;
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+ win->width = ncols;
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+ win->scr = stdscr->scr;
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+ win->parent = stdscr;
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+ return win;
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+}
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+
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+/**
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+ * Create a new sub-window
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+ *
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+ * @v orig parent window
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+ * @v nlines window height
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+ * @v ncols window width
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+ * @v begin_y window y origin (absolute)
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+ * @v begin_x window x origin (absolute)
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+ * @ret ptr return pointer to child window
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+ */
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+WINDOW *subwin ( WINDOW *parent, int nlines, int ncols,
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+ int begin_y, int begin_x ) {
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+ WINDOW *child;
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+ if ( parent == NULL )
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+ return NULL;
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+ child = malloc( sizeof( WINDOW ) );
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+ child = newwin( nlines, ncols, begin_y, begin_x );
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+ child->parent = parent;
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+ child->scr = parent->scr;
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+ return child;
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+}
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