我有一个较旧的基于 ncurses 的程序,它对一些文件(即:安装程序)执行一些简单的 IO。但是,从不同于 PuTTY 的终端,它与 SIGBUS 一起崩溃
Program received signal SIGBUS, Bus error.
0x00000000004028b1 in fDisplay (ptr=Variable "ptr" is not available.
) at file_cpy.c:676
676 sprintf(p, " %-36s ", (*ptr)->datainfo.option);
(gdb) where
#0 0x00000000004028b1 in fDisplay (ptr=Variable "ptr" is not available.
) at file_cpy.c:676
#1 0x0000000000402cdb in fredraw (c=0x7fffffffe860) at file_cpy.c:696
#2 0x0000000000401996 in ls_dispatch (c=0x2020202020202020) at ds_cell.c:324
#3 0x0000000000403bf2 in main_dir (c=0x2020202020202020) at file_cpy.c:811
#4 0x0000000000403cb3 in main () at file_cpy.c:1345
(gdb) x/i $pc
0x4028b1 <fDisplay+17>: mov (%rax),%rdx
(gdb)
无论 ncurses 版本和 32/64 位架构如何,这都会发生在 Linux 和 FreeBSD 上。我完全被难住了。
fDisplay() 在这里被调用:
/*
* File redraw routine. Draws current list on screen.
*/
int fredraw (CELL * c)
{
register int row = c->srow;
dlistptr p = c->list_start;
int i = 0;
char buff[200];
if (c->ecol - c->scol)
sprintf(buff, "%*s",c->ecol - c->scol + 1, " ");
while (i <= c->erow - c->srow && p != NULL)
{
if (p == c->current) wattron(c->window,A_REVERSE);
mvaddstr (row , c->scol, fDisplay(&p));
if (p == c->current) wattroff(c->window,A_REVERSE);
row++; i++;
p = p->nextlistptr;
}
if (row <= c -> erow)
for (; row <= c -> erow ; row++)
mvaddstr(row, c->scol, buff);
wrefresh(c->window);
c -> redraw = FALSE;
return TRUE;
}
fredraw() 在这里被调用:
int main_dir(CELL *c) {
int i;
getcwd(current_path, sizeof(current_path));
strcat(current_path, "/.config.h");
load_file(current_path);
c->keytable = file_cpy_menu;
c->func_table = file_cpy_table;
c->ListEntryProc = File_Entry;
c->UpdateStatusProc = status_update;
c->redraw = TRUE;
c->ListExitProc = List_Exit;
c->ListPaintProc = fredraw;
c->srow = 3;
c->scol = 1;
c->erow = c->window->_maxy - 5;
c->ecol = c->window->_maxx - 1;
c->max_rows = c->window->_maxy;
c->max_cols = c->window->_maxx;
c->filename = "[ Config ]";
c->menu_bar = 0;
c->normcolor = 0x07;
c->barcolor = 0x1f;
init_dlist(c);
for (i = 0; config_type[i].option; i++)
insert_fdlist(c, &config_type[i]);
/*
* Go Do It
*/
do {
c->redraw = TRUE;
ls_dispatch(c);
} while (c->termkey != ESC && c->termkey != ALT_X);
return TRUE;
}
最后,main() 调用上述函数:
int main() {
CELL file_cpy = {0};
WINDOW *mainwin;
mainwin = initscr();
start_color();
setup_colors();
cbreak();
noecho();
keypad(mainwin, TRUE);
meta(mainwin, TRUE);
raw();
leaveok(mainwin, TRUE);
wbkgd(mainwin, COLOR_PAIR(COLOR_MAIN));
wattron(mainwin, COLOR_PAIR(COLOR_MAIN));
werase(mainwin);
refresh();
file_cpy.window = mainwin;
main_dir(&file_cpy);
wbkgd(mainwin, A_NORMAL);
werase(mainwin);
echo();
nocbreak();
noraw();
refresh();
endwin();
return TRUE;
}