ncurses segfaulting at waddstr()
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Thread: ncurses segfaulting at waddstr()

  1. #1
    Join Date
    Sep 2009
    Posts
    2

    ncurses segfaulting at waddstr()

    I made a wrapper for the curses library except for that when i test it, it segfaults
    it was compiled with gcc4.3.3 and ncurses5.7 on a ubuntu 9.04 system

    here is my code:

    main.cpp:
    Code:
    #include "./include/ncurses/ncurses.h"
    
    int main()
    {
    	nCurses out;
    	out << "Testing 123...\n";
    	out.refresh();
    
    	return 0;
    }
    ./include/ncurses/ncurses.h:
    Code:
    #ifndef _NCURSES_H_
    #define _NCURSES_H_
    
    #include <curses.h>
    #include <string>
    using namespace std;
    
    struct term_s{
    	int row;
    	int col;
    };
    
    class nCurses
    {
    	public:
    		// constructors and deconstructors
    		nCurses();
    		nCurses(bool echo);
    		nCurses(bool echo, int row, int col);
    		nCurses(bool echo, int row, int col, int height, int width);
    		~nCurses();
    
    		// streaming functions
    		friend const nCurses& operator << (nCurses& n, const char* c);
    
    		// functions to get the private data
    		bool getechostatus() const;
    		int geterrno() const;
    		term_s getcurpos() const;
    		term_s getwinsize() const;
    
    		// misc functions
    		int echo(bool echo); // control echoing of input characters
    		int cursor(int row, int col); // move the virtual cursor
    		int refresh(); // refresh the screen from the buffer
    
    	private:
    		void init();
    		bool echostatus; // contains if echo is on or off
    		int errno; // maintains the errno (ERR or !ERR) of the latest function
    
    		term_s winsize; // contains the current cursor postion and the terminal size
    
    		WINDOW* window; // the virtual window that functions write to
    
    		static bool ncurses_started; // monitors if ncurses has been started
    		static int nCurses_count; // keeps a count of how many nCurses objects have been constructed
    };
    
    #endif
    ./include/ncurses/ncurses.cpp:
    Code:
    #include "ncurses.h"
    
    /* init the static variables */
    bool nCurses::ncurses_started = false;
    int nCurses::nCurses_count = 0;
    
    /* init some variables */
    void nCurses::init()
    {
    	if (ncurses_started == false)
    	{
    		initscr();
    		ncurses_started = true;
    	}
    	getmaxyx(stdscr, winsize.row, winsize.col);
    }
    
    /* constructors and deconstructors */
    nCurses::nCurses()
    {
    	init();
    	nCurses(false, 0, 0, winsize.row, winsize.col);
    }
    
    nCurses::nCurses(bool echo)
    {
    	init();
    	nCurses(echo, 0, 0, winsize.row, winsize.col);
    }
    
    nCurses::nCurses(bool echo, int row, int col)
    {
    	init();
    	nCurses(false, row, col, winsize.row, winsize.col);
    }
    
    nCurses::nCurses(bool echo, int row, int col, int height, int width) : echostatus(echo)
    {
    	nCurses_count++;
    	init();
    	window = newwin(height, width, row, col);
    	keypad(window, TRUE);
    	cbreak();
    	if (echo == false)
    	{
    		errno = noecho();
    		if (errno == ERR)
    			echostatus = true;
    	}
    	cursor(row, col);
    }
    
    nCurses::~nCurses()
    {
    	nCurses_count--;
    	delwin(window);
    	if (nCurses_count <= 0)
    	{
    		endwin();
    	}
    }
    
    /* streaming functions */
    const nCurses& operator << (nCurses& n, const char* c)
    {
    	n.errno = waddstr(n.window, c);
    	return n;
    }
    
    /* functions to get the private data */
    bool nCurses::getechostatus() const
    {
    	return echostatus;
    }
    
    int nCurses::geterrno() const
    {
    	return errno;
    }
    
    term_s nCurses::getcurpos() const
    {
    	term_s curpos;
    	getyx(window, curpos.row, curpos.col);
    	return curpos;
    }
    
    term_s nCurses::getwinsize() const
    {
    	return winsize;
    }
    
    /* misc functions */
    int nCurses::echo(bool echo)
    {
    	if ((echo == true) && (echostatus != true))
    	{
    		errno = ::echo();
    		if (errno != ERR)
    			echostatus = true;
    	}
    	else if ((echo == false) && (echostatus != false))
    	{
    		errno = noecho();
    		if (noecho() != ERR)
    			echostatus = false;
    	}
    	return errno;
    }
    
    int nCurses::cursor(int row, int col)
    {
    	errno = wmove(window, row, col);
    	return errno;
    }
    
    int nCurses::refresh()
    {
    	errno = wrefresh(window);
    	return errno;
    }

  2. #2
    Join Date
    Sep 2009
    Posts
    2

    Re: ncurses segfaulting at waddstr()

    whoops, i see a orphaned <string> library there that needs to be deleted...

    still segfaulting

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