218 lines
6.2 KiB
C
218 lines
6.2 KiB
C
/*-
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* Copyright (c) 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char sccsid[] = "@(#)sex_term.c 8.40 (Berkeley) 8/17/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/queue.h>
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#include <sys/time.h>
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#include <bitstring.h>
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#include <errno.h>
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#include <limits.h>
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#include <signal.h>
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#include <stdio.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include "compat.h"
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#include <db.h>
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#include <regex.h>
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#include "vi.h"
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#include "excmd.h"
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#include "../ex/script.h"
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/*
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* sex_key_read --
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* Read characters from the input.
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*/
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enum input
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sex_key_read(sp, nrp, timeout)
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SCR *sp;
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int *nrp;
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struct timeval *timeout;
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{
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struct timeval t, *tp;
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GS *gp;
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IBUF *tty;
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int maxfd, nr;
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*nrp = 0;
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gp = sp->gp;
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tty = gp->tty;
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/*
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* We're about to block; check for signals. If a signal received,
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* clear it immediately, so that if it's reset while being serviced
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* we won't miss it.
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*
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* These signal recipients set global flags. None of this has
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* anything to do with input keys, but it's something that can't
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* be done asynchronously without adding locking to handle race
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* conditions, and which needs to be done periodically.
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*/
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sigchk: while (F_ISSET(gp, G_SIGINT | G_SIGWINCH)) {
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if (F_ISSET(gp, G_SIGINT))
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return (INP_INTR);
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if (F_ISSET(gp, G_SIGWINCH)) {
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F_CLR(gp, G_SIGWINCH);
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if (!sp->s_window(sp, 1))
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(void)sp->s_refresh(sp, sp->ep);
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}
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}
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/*
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* There are three cases here:
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*
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* 1: A read from a file or a pipe. In this case, the reads
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* never timeout regardless. This means that we can hang
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* when trying to complete a map, but we're going to hang
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* on the next read anyway.
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*/
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if (!F_ISSET(gp, G_STDIN_TTY)) {
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if ((nr = read(STDIN_FILENO,
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tty->ch + tty->next + tty->cnt,
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tty->nelem - (tty->next + tty->cnt))) > 0)
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goto success;
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return (INP_EOF);
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}
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/*
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* 2: A read with an associated timeout. In this case, we are trying
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* to complete a map sequence. Ignore script windows and timeout
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* as specified. If input arrives, we fall into #3, but because
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* timeout isn't NULL, don't read anything but command input.
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*
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* If interrupted, go back and check to see what it was.
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*/
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if (timeout != NULL) {
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if (F_ISSET(sp, S_SCRIPT))
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FD_CLR(sp->script->sh_master, &sp->rdfd);
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FD_SET(STDIN_FILENO, &sp->rdfd);
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for (;;) {
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switch (select(STDIN_FILENO + 1,
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&sp->rdfd, NULL, NULL, timeout)) {
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case -1: /* Error or interrupt. */
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if (errno == EINTR)
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goto sigchk;
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goto err;
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case 1: /* Characters ready. */
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break;
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case 0: /* Timeout. */
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return (INP_OK);
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}
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break;
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}
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}
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/*
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* 3: At this point, we'll take anything that comes. Select on the
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* command file descriptor and the file descriptor for the script
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* window if there is one. Poll the fd's, increasing the timeout
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* each time each time we don't get anything until we're blocked
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* on I/O.
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*
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* If interrupted, go back and check to see what it was.
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*/
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for (t.tv_sec = t.tv_usec = 0;;) {
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/*
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* Reset each time -- sscr_input() may call other
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* routines which could reset bits.
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*/
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if (timeout == NULL && F_ISSET(sp, S_SCRIPT)) {
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tp = &t;
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FD_SET(STDIN_FILENO, &sp->rdfd);
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if (F_ISSET(sp, S_SCRIPT)) {
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FD_SET(sp->script->sh_master, &sp->rdfd);
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maxfd =
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MAX(STDIN_FILENO, sp->script->sh_master);
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} else
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maxfd = STDIN_FILENO;
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} else {
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tp = NULL;
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FD_SET(STDIN_FILENO, &sp->rdfd);
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if (F_ISSET(sp, S_SCRIPT))
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FD_CLR(sp->script->sh_master, &sp->rdfd);
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maxfd = STDIN_FILENO;
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}
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switch (select(maxfd + 1, &sp->rdfd, NULL, NULL, tp)) {
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case -1: /* Error or interrupt. */
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if (errno == EINTR)
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goto sigchk;
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err: msgq(sp, M_SYSERR, "select");
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return (INP_ERR);
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case 0: /* Timeout. */
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if (t.tv_usec) {
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++t.tv_sec;
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t.tv_usec = 0;
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} else
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t.tv_usec += 500000;
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continue;
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}
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if (timeout == NULL && F_ISSET(sp, S_SCRIPT) &&
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FD_ISSET(sp->script->sh_master, &sp->rdfd)) {
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sscr_input(sp);
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continue;
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}
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switch (nr = read(STDIN_FILENO,
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tty->ch + tty->next + tty->cnt,
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tty->nelem - (tty->next + tty->cnt))) {
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case 0: /* EOF. */
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return (INP_EOF);
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case -1: /* Error or interrupt. */
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if (errno == EINTR)
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goto sigchk;
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msgq(sp, M_SYSERR, "read");
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return (INP_ERR);
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default:
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goto success;
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}
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/* NOTREACHED */
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}
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success:
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MEMSET(tty->chf + tty->next + tty->cnt, 0, nr);
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tty->cnt += *nrp = nr;
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return (INP_OK);
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}
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