Re: wget_wch problem

[Thomas Dickey]

On Wed, 14 Jan 2004, Saravanan Bellan wrote:

> When running the following program on Solaris 8 with
> ncurses(ncurses-5.3-20031004-patch) and zh_CN.GB18030 I get a seg fault at
> wget_wch (stack trace below)

perhaps linking against libncurses_g would give more information.
Is this with Sun's locale support, or using libiconv?
I may be able to test the latter on Linux.

Reading the code, I suspect a buffer overflow - since the buffer
into which mbrtowc writes is fixed (I should alter that).

> It works fine for any other locale.
>
> Any ideas.
>
> #include <signal.h>
> #include <locale.h>
> #include <curses.h>
> #include <errno.h>
> #include <stddef.h>
>
> main(int argc, char ** argv) {
>       WINDOW *win;
>       wint_t in_wc;
>       int ret_c;
>
>       initscr(); nonl(); noecho(); raw(); erase(); refresh();
>
>       setlocale(LC_ALL, "");
>
>       win = newwin(20, 60, 0, 0);
>
>       clearok(win, 1); touchwin(win); wrefresh(win);
>       do {
>               errno = 0;
>               ret_c = wget_wch(win, &in_wc);
>       } while ((ret_c == ERR) && (errno == EINTR));
>         noraw();
>       endwin();
> }
>
> The back trace from gdb,
>
> Program terminated with signal 11, Segmentation Fault.
> Loaded symbols for /usr/lib/locale/zh_CN.GB18030/methods_zh_CN.GB18030.so.2
> (gdb) bt
> #0  0xff3516e4 in __mbrtowc_dense_gb18030 ()
>    from /usr/lib/locale/zh_CN.GB18030/methods_zh_CN.GB18030.so.2
> #1  0x1d718 in wget_wch ()
> #2  0x12e58 in main (argc=1, argv=0xffbef62c) at wget.c:21
>
>
> Thanks,
> -Sarva
>
>
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-- 
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net