633 lines
13 KiB
C
633 lines
13 KiB
C
/*
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* $Id: ui_getc.c,v 1.65 2011/10/20 23:45:48 tom Exp $
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*
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* ui_getc.c - user interface glue for getc()
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*
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* Copyright 2001-2010,2011 Thomas E. Dickey
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License, version 2.1
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to
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* Free Software Foundation, Inc.
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* 51 Franklin St., Fifth Floor
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* Boston, MA 02110, USA.
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*/
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#include <dialog.h>
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#include <dlg_keys.h>
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#ifdef NEED_WCHAR_H
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#include <wchar.h>
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#endif
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#if TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# if HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <time.h>
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# endif
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#ifdef __QNX__
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#include <sys/select.h>
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#endif
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#ifndef WEXITSTATUS
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# ifdef HAVE_TYPE_UNIONWAIT
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# define WEXITSTATUS(status) (status.w_retcode)
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# else
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# define WEXITSTATUS(status) (((status) & 0xff00) >> 8)
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# endif
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#endif
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#ifndef WTERMSIG
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# ifdef HAVE_TYPE_UNIONWAIT
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# define WTERMSIG(status) (status.w_termsig)
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# else
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# define WTERMSIG(status) ((status) & 0x7f)
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# endif
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#endif
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void
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dlg_add_callback(DIALOG_CALLBACK * p)
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{
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p->next = dialog_state.getc_callbacks;
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dialog_state.getc_callbacks = p;
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wtimeout(p->win, WTIMEOUT_VAL);
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}
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/*
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* Like dlg_add_callback(), but providing for cleanup of caller's associated
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* state.
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*/
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void
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dlg_add_callback_ref(DIALOG_CALLBACK ** p, DIALOG_FREEBACK freeback)
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{
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(*p)->caller = p;
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(*p)->freeback = freeback;
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dlg_add_callback(*p);
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}
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void
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dlg_remove_callback(DIALOG_CALLBACK * p)
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{
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DIALOG_CALLBACK *q;
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if (p->input != 0) {
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fclose(p->input);
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if (p->input == dialog_state.pipe_input)
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dialog_state.pipe_input = 0;
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p->input = 0;
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}
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if (!(p->keep_win))
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dlg_del_window(p->win);
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if ((q = dialog_state.getc_callbacks) == p) {
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dialog_state.getc_callbacks = p->next;
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} else {
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while (q != 0) {
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if (q->next == p) {
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q->next = p->next;
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break;
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}
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q = q->next;
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}
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}
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/* handle dlg_add_callback_ref cleanup */
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if (p->freeback != 0)
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p->freeback(p);
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if (p->caller != 0)
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*(p->caller) = 0;
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free(p);
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}
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/*
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* A select() might find more than one input ready for service. Handle them
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* all.
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*/
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static bool
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handle_inputs(WINDOW *win)
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{
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bool result = FALSE;
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DIALOG_CALLBACK *p;
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DIALOG_CALLBACK *q;
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int cur_y, cur_x;
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int state = ERR;
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getyx(win, cur_y, cur_x);
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for (p = dialog_state.getc_callbacks, q = 0; p != 0; p = q) {
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q = p->next;
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if ((p->handle_input != 0) && p->input_ready) {
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p->input_ready = FALSE;
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if (state == ERR) {
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state = curs_set(0);
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}
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if (p->handle_input(p)) {
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result = TRUE;
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}
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}
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}
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if (result) {
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(void) wmove(win, cur_y, cur_x); /* Restore cursor position */
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wrefresh(win);
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curs_set(state);
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}
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return result;
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}
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static bool
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may_handle_inputs(void)
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{
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bool result = FALSE;
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DIALOG_CALLBACK *p;
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for (p = dialog_state.getc_callbacks; p != 0; p = p->next) {
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if (p->input != 0) {
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result = TRUE;
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break;
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}
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}
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return result;
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}
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/*
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* Check any any inputs registered via callbacks, to see if there is any input
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* available. If there is, return a file-descriptor which should be read.
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* Otherwise, return -1.
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*/
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static int
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check_inputs(void)
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{
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DIALOG_CALLBACK *p;
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fd_set read_fds;
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struct timeval test;
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int last_fd = -1;
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int fd;
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int found;
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int result = -1;
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if ((p = dialog_state.getc_callbacks) != 0) {
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FD_ZERO(&read_fds);
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while (p != 0) {
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p->input_ready = FALSE;
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if (p->input != 0 && (fd = fileno(p->input)) >= 0) {
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FD_SET(fd, &read_fds);
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if (last_fd < fd)
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last_fd = fd;
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}
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p = p->next;
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}
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test.tv_sec = 0;
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test.tv_usec = WTIMEOUT_VAL * 1000;
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found = select(last_fd + 1, &read_fds,
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(fd_set *) 0,
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(fd_set *) 0,
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&test);
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if (found > 0) {
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for (p = dialog_state.getc_callbacks; p != 0; p = p->next) {
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if (p->input != 0
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&& (fd = fileno(p->input)) >= 0
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&& FD_ISSET(fd, &read_fds)) {
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p->input_ready = TRUE;
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result = fd;
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}
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}
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}
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}
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return result;
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}
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int
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dlg_getc_callbacks(int ch, int fkey, int *result)
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{
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int code = FALSE;
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DIALOG_CALLBACK *p, *q;
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if ((p = dialog_state.getc_callbacks) != 0) {
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if (check_inputs() >= 0) {
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do {
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q = p->next;
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if (p->input_ready) {
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if (!(p->handle_getc(p, ch, fkey, result))) {
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dlg_remove_callback(p);
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}
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}
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} while ((p = q) != 0);
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}
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code = (dialog_state.getc_callbacks != 0);
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}
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return code;
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}
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static void
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dlg_raise_window(WINDOW *win)
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{
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touchwin(win);
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wmove(win, getcury(win), getcurx(win));
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wnoutrefresh(win);
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doupdate();
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}
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/*
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* This is a work-around for the case where we actually need the wide-character
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* code versus a byte stream.
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*/
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static int last_getc = ERR;
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#ifdef USE_WIDE_CURSES
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static char last_getc_bytes[80];
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static int have_last_getc;
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static int used_last_getc;
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#endif
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int
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dlg_last_getc(void)
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{
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#ifdef USE_WIDE_CURSES
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if (used_last_getc != 1)
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return ERR; /* not really an error... */
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#endif
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return last_getc;
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}
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void
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dlg_flush_getc(void)
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{
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last_getc = ERR;
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#ifdef USE_WIDE_CURSES
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have_last_getc = 0;
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used_last_getc = 0;
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#endif
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}
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/*
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* Check if the stream has been unexpectedly closed, returning false in that
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* case.
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*/
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static bool
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valid_file(FILE *fp)
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{
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bool code = FALSE;
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int fd = fileno(fp);
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if (fd >= 0) {
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if (fcntl(fd, F_GETFL, 0) >= 0) {
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code = TRUE;
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}
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}
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return code;
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}
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static int
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really_getch(WINDOW *win, int *fkey)
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{
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int ch;
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#ifdef USE_WIDE_CURSES
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int code;
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mbstate_t state;
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wchar_t my_wchar;
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wint_t my_wint;
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/*
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* We get a wide character, translate it to multibyte form to avoid
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* having to change the rest of the code to use wide-characters.
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*/
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if (used_last_getc >= have_last_getc) {
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used_last_getc = 0;
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have_last_getc = 0;
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ch = ERR;
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*fkey = 0;
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code = wget_wch(win, &my_wint);
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my_wchar = (wchar_t) my_wint;
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switch (code) {
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case KEY_CODE_YES:
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ch = *fkey = my_wchar;
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last_getc = my_wchar;
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break;
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case OK:
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memset(&state, 0, sizeof(state));
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have_last_getc = (int) wcrtomb(last_getc_bytes, my_wchar, &state);
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if (have_last_getc < 0) {
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have_last_getc = used_last_getc = 0;
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last_getc_bytes[0] = (char) my_wchar;
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}
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ch = (int) CharOf(last_getc_bytes[used_last_getc++]);
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last_getc = my_wchar;
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break;
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case ERR:
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ch = ERR;
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last_getc = ERR;
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break;
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default:
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break;
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}
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} else {
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ch = (int) CharOf(last_getc_bytes[used_last_getc++]);
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}
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#else
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ch = wgetch(win);
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last_getc = ch;
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*fkey = (ch > KEY_MIN && ch < KEY_MAX);
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#endif
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return ch;
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}
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static DIALOG_CALLBACK *
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next_callback(DIALOG_CALLBACK * p)
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{
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if ((p = dialog_state.getc_redirect) != 0) {
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p = p->next;
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} else {
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p = dialog_state.getc_callbacks;
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}
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return p;
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}
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static DIALOG_CALLBACK *
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prev_callback(DIALOG_CALLBACK * p)
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{
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DIALOG_CALLBACK *q;
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if ((p = dialog_state.getc_redirect) != 0) {
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if (p == dialog_state.getc_callbacks) {
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for (p = dialog_state.getc_callbacks; p->next != 0; p = p->next) ;
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} else {
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for (q = dialog_state.getc_callbacks; q->next != p; q = q->next) ;
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p = q;
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}
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} else {
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p = dialog_state.getc_callbacks;
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}
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return p;
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}
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#define isBeforeChr(chr) ((chr) == before_chr && !before_fkey)
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#define isBeforeFkey(chr) ((chr) == before_chr && before_fkey)
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/*
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* Read a character from the given window. Handle repainting here (to simplify
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* things in the calling application). Also, if input-callback(s) are set up,
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* poll the corresponding files and handle the updates, e.g., for displaying a
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* tailbox.
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*/
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int
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dlg_getc(WINDOW *win, int *fkey)
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{
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WINDOW *save_win = win;
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int ch = ERR;
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int before_chr;
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int before_fkey;
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int result;
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bool done = FALSE;
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bool literal = FALSE;
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DIALOG_CALLBACK *p = 0;
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int interval = (dialog_vars.timeout_secs * 1000);
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time_t expired = time((time_t *) 0) + dialog_vars.timeout_secs;
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time_t current;
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if (may_handle_inputs())
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wtimeout(win, WTIMEOUT_VAL);
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else if (interval > 0)
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wtimeout(win, interval);
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while (!done) {
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bool handle_others = FALSE;
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/*
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* If there was no pending file-input, check the keyboard.
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*/
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ch = really_getch(win, fkey);
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if (literal) {
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done = TRUE;
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continue;
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}
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before_chr = ch;
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before_fkey = *fkey;
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ch = dlg_lookup_key(win, ch, fkey);
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dlg_trace_chr(ch, *fkey);
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current = time((time_t *) 0);
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/*
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* If we acquired a fkey value, then it is one of dialog's builtin
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* codes such as DLGK_HELPFILE.
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*/
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if (!*fkey || *fkey != before_fkey) {
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switch (ch) {
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case CHR_LITERAL:
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if (!literal) {
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literal = TRUE;
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keypad(win, FALSE);
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continue;
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}
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break;
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case CHR_REPAINT:
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(void) touchwin(win);
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(void) wrefresh(curscr);
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break;
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case ERR: /* wtimeout() in effect; check for file I/O */
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if (interval > 0
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&& current >= expired) {
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dlg_exiterr("timeout");
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}
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if (!valid_file(stdin)
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|| !valid_file(dialog_state.screen_output)) {
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ch = ESC;
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done = TRUE;
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} else if (check_inputs()) {
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if (handle_inputs(win))
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dlg_raise_window(win);
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else
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done = TRUE;
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} else {
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done = (interval <= 0);
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}
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break;
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case DLGK_HELPFILE:
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if (dialog_vars.help_file) {
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int yold, xold;
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getyx(win, yold, xold);
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dialog_helpfile("HELP", dialog_vars.help_file, 0, 0);
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dlg_raise_window(win);
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wmove(win, yold, xold);
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}
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continue;
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case DLGK_FIELD_PREV:
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/* FALLTHRU */
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case KEY_BTAB:
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/* FALLTHRU */
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case DLGK_FIELD_NEXT:
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/* FALLTHRU */
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case TAB:
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/* Handle tab/backtab as a special case for traversing between
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* the nominal "current" window, and other windows having
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* callbacks. If the nominal (control) window closes, we'll
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* close the windows with callbacks.
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*/
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if (dialog_state.getc_callbacks != 0 &&
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(isBeforeChr(TAB) ||
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isBeforeFkey(KEY_BTAB))) {
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p = (isBeforeChr(TAB)
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? next_callback(p)
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: prev_callback(p));
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if ((dialog_state.getc_redirect = p) != 0) {
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win = p->win;
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} else {
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win = save_win;
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}
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dlg_raise_window(win);
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break;
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}
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/* FALLTHRU */
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default:
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#ifdef NO_LEAKS
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if (isBeforeChr(DLG_CTRL('P'))) {
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/* for testing, ^P closes the connection */
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close(0);
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close(1);
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close(2);
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break;
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}
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#endif
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handle_others = TRUE;
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break;
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#ifdef HAVE_DLG_TRACE
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case CHR_TRACE:
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dlg_trace_win(win);
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break;
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#endif
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}
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} else {
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handle_others = TRUE;
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}
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if (handle_others) {
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if ((p = dialog_state.getc_redirect) != 0) {
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if (!(p->handle_getc(p, ch, *fkey, &result))) {
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done = (p->win == save_win) && (!p->keep_win);
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dlg_remove_callback(p);
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dialog_state.getc_redirect = 0;
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win = save_win;
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}
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} else {
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done = TRUE;
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}
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}
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}
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if (literal)
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keypad(win, TRUE);
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return ch;
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}
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static void
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finish_bg(int sig GCC_UNUSED)
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{
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end_dialog();
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dlg_exit(DLG_EXIT_ERROR);
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}
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/*
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* If we have callbacks active, purge the list of all that are not marked
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* to keep in the background. If any remain, run those in a background
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* process.
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*/
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void
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dlg_killall_bg(int *retval)
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{
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DIALOG_CALLBACK *cb;
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int pid;
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#ifdef HAVE_TYPE_UNIONWAIT
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union wait wstatus;
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#else
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int wstatus;
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#endif
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if ((cb = dialog_state.getc_callbacks) != 0) {
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|
while (cb != 0) {
|
|
if (cb->keep_bg) {
|
|
cb = cb->next;
|
|
} else {
|
|
dlg_remove_callback(cb);
|
|
cb = dialog_state.getc_callbacks;
|
|
}
|
|
}
|
|
if (dialog_state.getc_callbacks != 0) {
|
|
|
|
refresh();
|
|
fflush(stdout);
|
|
fflush(stderr);
|
|
reset_shell_mode();
|
|
if ((pid = fork()) != 0) {
|
|
_exit(pid > 0 ? DLG_EXIT_OK : DLG_EXIT_ERROR);
|
|
} else if (pid == 0) { /* child */
|
|
if ((pid = fork()) != 0) {
|
|
/*
|
|
* Echo the process-id of the grandchild so a shell script
|
|
* can read that, and kill that process. We'll wait around
|
|
* until then. Our parent has already left, leaving us
|
|
* temporarily orphaned.
|
|
*/
|
|
if (pid > 0) { /* parent */
|
|
fprintf(stderr, "%d\n", pid);
|
|
fflush(stderr);
|
|
}
|
|
/* wait for child */
|
|
#ifdef HAVE_WAITPID
|
|
while (-1 == waitpid(pid, &wstatus, 0)) {
|
|
#ifdef EINTR
|
|
if (errno == EINTR)
|
|
continue;
|
|
#endif /* EINTR */
|
|
#ifdef ERESTARTSYS
|
|
if (errno == ERESTARTSYS)
|
|
continue;
|
|
#endif /* ERESTARTSYS */
|
|
break;
|
|
}
|
|
#else
|
|
while (wait(&wstatus) != pid) /* do nothing */
|
|
;
|
|
#endif
|
|
_exit(WEXITSTATUS(wstatus));
|
|
} else if (pid == 0) {
|
|
if (!dialog_vars.cant_kill)
|
|
(void) signal(SIGHUP, finish_bg);
|
|
(void) signal(SIGINT, finish_bg);
|
|
(void) signal(SIGQUIT, finish_bg);
|
|
(void) signal(SIGSEGV, finish_bg);
|
|
while (dialog_state.getc_callbacks != 0) {
|
|
int fkey = 0;
|
|
dlg_getc_callbacks(ERR, fkey, retval);
|
|
napms(1000);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|