/* * cl_attr -- * Toggle a screen attribute on/off. * * PUBLIC: int cl_attr __P((SCR *, scr_attr_t, int)); */ int cl_attr(SCR *sp, scr_attr_t attribute, int on) { CL_PRIVATE *clp; WINDOW *win; clp = CLP(sp); win = CLSP(sp) ? CLSP(sp) : stdscr; switch (attribute) { case SA_ALTERNATE: /* * !!! * There's a major layering violation here. The problem is that the * X11 xterm screen has what's known as an "alternate" screen. Some * xterm termcap/terminfo entries include sequences to switch to/from * that alternate screen as part of the ti/te (smcup/rmcup) strings. * Vi runs in the alternate screen, so that you are returned to the * same screen contents on exit from vi that you had when you entered * vi. Further, when you run :shell, or :!date or similar ex commands, * you also see the original screen contents. This wasn't deliberate * on vi's part, it's just that it historically sent terminal init/end * sequences at those times, and the addition of the alternate screen * sequences to the strings changed the behavior of vi. The problem * caused by this is that we don't want to switch back to the alternate * screen while getting a new command from the user, when the user is * continuing to enter ex commands, e.g.: * * :!date <<< switch to original screen * [Hit return to continue] <<< prompt user to continue * :command <<< get command from user * * Note that the :command input is a true vi input mode, e.g., input * maps and abbreviations are being done. So, we need to be able to * switch back into the vi screen mode, without flashing the screen. * * To make matters worse, the curses initscr() and endwin() calls will * do this automatically -- so, this attribute isn't as controlled by * the higher level screen as closely as one might like. */ if (on) { if (clp->ti_te != TI_SENT) { clp->ti_te = TI_SENT; if (clp->smcup == NULL) (void)cl_getcap(sp, "smcup", &clp->smcup); if (clp->smcup != NULL) (void)tputs(clp->smcup, 1, cl_putchar); } } else if (clp->ti_te != TE_SENT) { clp->ti_te = TE_SENT; if (clp->rmcup == NULL) (void)cl_getcap(sp, "rmcup", &clp->rmcup); if (clp->rmcup != NULL) (void)tputs(clp->rmcup, 1, cl_putchar); (void)fflush(stdout); } (void)fflush(stdout); break; case SA_INVERSE: if (F_ISSET(sp, SC_EX | SC_SCR_EXWROTE)) { if (clp->smso == NULL) return (1); if (on) (void)tputs(clp->smso, 1, cl_putchar); else (void)tputs(clp->rmso, 1, cl_putchar); (void)fflush(stdout); } else { if (on) (void)wstandout(win); else (void)wstandend(win); } break; default: abort(); } return (0); }
/* * cl_ex_init -- * Initialize the ex screen. */ static int cl_ex_init(SCR *sp) { CL_PRIVATE *clp; int error; const char *ttype; clp = CLP(sp); /* If already initialized, just set the terminal modes. */ if (F_ISSET(clp, CL_SCR_EX_INIT)) goto fast; /* If not reading from a file, we're done. */ if (!F_ISSET(clp, CL_STDIN_TTY)) return (0); if (F_ISSET(clp, CL_CHANGE_TERM)) { if (F_ISSET(clp, CL_SETUPTERM) && del_curterm(cur_term)) return (1); F_CLR(clp, CL_SETUPTERM | CL_CHANGE_TERM); } if (!F_ISSET(clp, CL_SETUPTERM)) { /* We'll need a terminal type. */ if (opts_empty(sp, O_TERM, 0)) return (1); ttype = O_STR(sp, O_TERM); (void)setupterm(ttype, STDOUT_FILENO, &error); if (error == 0 || error == -1) return (1); } /* Get the ex termcap/terminfo strings. */ (void)cl_getcap(sp, "cup", &clp->cup); (void)cl_getcap(sp, "smso", &clp->smso); (void)cl_getcap(sp, "rmso", &clp->rmso); (void)cl_getcap(sp, "el", &clp->el); (void)cl_getcap(sp, "cuu1", &clp->cuu1); /* Enter_standout_mode and exit_standout_mode are paired. */ if (clp->smso == NULL || clp->rmso == NULL) { if (clp->smso != NULL) { free(clp->smso); clp->smso = NULL; } if (clp->rmso != NULL) { free(clp->rmso); clp->rmso = NULL; } } /* * Turn on canonical mode, with normal input and output processing. * Start with the original terminal settings as the user probably * had them (including any local extensions) set correctly for the * current terminal. * * !!! * We can't get everything that we need portably; for example, ONLCR, * mapping <newline> to <carriage-return> on output isn't required * by POSIX 1003.1b-1993. If this turns out to be a problem, then * we'll either have to play some games on the mapping, or we'll have * to make all ex printf's output \r\n instead of \n. */ clp->ex_enter = clp->orig; clp->ex_enter.c_lflag |= ECHO | ECHOE | ECHOK | ICANON | IEXTEN | ISIG; #ifdef ECHOCTL clp->ex_enter.c_lflag |= ECHOCTL; #endif #ifdef ECHOKE clp->ex_enter.c_lflag |= ECHOKE; #endif clp->ex_enter.c_iflag |= ICRNL; clp->ex_enter.c_oflag |= OPOST; #ifdef ONLCR clp->ex_enter.c_oflag |= ONLCR; #endif fast: if (tcsetattr(STDIN_FILENO, TCSADRAIN | TCSASOFT, &clp->ex_enter)) { if (errno == EINTR) goto fast; msgq(sp, M_SYSERR, "tcsetattr"); return (1); } return (0); }