04-10-2016
Why is the column added to row 2 always filled with 0-0-0-0-0? Why aren't entries in that row set to 1 if the number in a given column in row 2 is not present in row 1? In the given example, why shouldn't the last field in the output for row 2 be 1-1-1-1-1?
Other than being an interesting puzzle, does this problem address some real-world issue?
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LEARN ABOUT OPENSOLARIS
overlay
overlay(3XCURSES) X/Open Curses Library Functions overlay(3XCURSES)
NAME
overlay, overwrite - copy overlapped windows
SYNOPSIS
cc [ flag... ] file... -I /usr/xpg4/include -L /usr/xpg4/lib
-R /usr/xpg4/lib -lcurses [ library... ]
c89 [ flag... ] file... -lcurses [ library... ]
#include <curses.h>
int overlay(const WINDOW *srcwin, WINDOW *dstwin);
int overwrite(const WINDOW *srcwin, WINDOW *dstwin);
PARAMETERS
srcwin Is a pointer to the source window to be copied.
dstwin Is a pointer to the destination window to be overlayed or overwritten.
DESCRIPTION
The overwrite() and overlay() functions overlay srcwin on top of destwin. The srcwin and dstwin arguments do not have to be the same size;
only text where the two windows overlap is copied.
The overwrite() function copies characters as though a sequence of win_wch(3XCURSES) and wadd_wch(3XCURSES) were performed with the desti-
nation window's attributes and background attributes cleared.
The overlay() function does the same thing, except that, whenever a character to be copied is the background character of the source win-
dow, overlay() does not copy the character but merely moves the destination cursor the width of the source background character.
If any portion of the overlaying window border is not the first column of a multi-column character, then all the column positions will be
replaced with the background character and rendition before the overlay is done. If the default background character is a multi-column
character when this occurs, then these functions fail.
RETURN VALUES
Upon successful completion, these functions return OK. Otherwise, they return ERR.
ERRORS
No errors are defined.
EXAMPLES
Example 1 Implement a pop-up dialog
The following example demonstrates the use of overwrite() to implement a pop-up dialog box.
#include <curses.h>
/*
* Pop-up a window on top of curscr. If row and/or col
* are -1 then that dimension will be centered within
* curscr. Return 0 for success or -1 if malloc() failed.
* Pass back the working window and the saved window for the
* pop-up. The saved window should not be modified.
*/
int
popup(work, save, nrows, ncols, row, col)
WINDOW **work, **save;
int nrows, ncols, row, col;
{
int mr, mc;
getmaxyx(curscr, mr, mc);
/* Windows are limited to the size of curscr. */
if (mr < nrows)
nrows = mr;
if (mc < ncols)
ncols = mc;
/* Center dimensions. */
if (row == -1)
row = (mr-nrows)/2;
if (col == -1)
col = (mc-ncols)/2;
/* The window must fit entirely in curscr. */
if (mr < row+nrows)
row = 0;
if (mc < col+ncols)
col = 0;
*work = newwin(nrows, ncols, row, col);
if (*work == NULL)
return (-1);
if ((*save = dupwin(*work)) == NULL) {
delwin(*work);
return (-1);
}
overwrite(curscr, *save);
return(0);
}
/*
* Restore the region covered by a pop-up window.
* Delete the working window and the saved window.
* This function is the complement to popup(). Return
* 0 for success or -1 for an error.
*/
int
popdown(work, save)
WINDOW *work, *save;
{
(void) wnoutrefresh(save);
(void) delwin(save);
(void) delwin(work);
return(0);
}
/*
* Compute the size of a dialog box that would fit around
* the string.
*/
void
dialsize(str, nrows, ncols)
char *str;
int *nrows, *ncols;
{
int rows, cols, col;
for (rows = 1, cols = col = 0; *str != '