NetBSD/usr.bin/vi/sex/sex_term.c

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/*-
* Copyright (c) 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
1994-08-18 00:12:00 +04:00
static char sccsid[] = "@(#)sex_term.c 8.40 (Berkeley) 8/17/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
#include "excmd.h"
#include "../ex/script.h"
/*
* sex_key_read --
* Read characters from the input.
*/
enum input
sex_key_read(sp, nrp, timeout)
SCR *sp;
int *nrp;
struct timeval *timeout;
{
struct timeval t, *tp;
GS *gp;
IBUF *tty;
int maxfd, nr;
*nrp = 0;
gp = sp->gp;
tty = gp->tty;
/*
* We're about to block; check for signals. If a signal received,
* clear it immediately, so that if it's reset while being serviced
* we won't miss it.
*
* These signal recipients set global flags. None of this has
* anything to do with input keys, but it's something that can't
* be done asynchronously without adding locking to handle race
* conditions, and which needs to be done periodically.
*/
sigchk: while (F_ISSET(gp, G_SIGINT | G_SIGWINCH)) {
if (F_ISSET(gp, G_SIGINT))
return (INP_INTR);
if (F_ISSET(gp, G_SIGWINCH)) {
F_CLR(gp, G_SIGWINCH);
if (!sp->s_window(sp, 1))
(void)sp->s_refresh(sp, sp->ep);
}
}
/*
* There are three cases here:
*
* 1: A read from a file or a pipe. In this case, the reads
* never timeout regardless. This means that we can hang
* when trying to complete a map, but we're going to hang
* on the next read anyway.
*/
if (!F_ISSET(gp, G_STDIN_TTY)) {
if ((nr = read(STDIN_FILENO,
tty->ch + tty->next + tty->cnt,
tty->nelem - (tty->next + tty->cnt))) > 0)
goto success;
return (INP_EOF);
}
/*
* 2: A read with an associated timeout. In this case, we are trying
* to complete a map sequence. Ignore script windows and timeout
* as specified. If input arrives, we fall into #3, but because
* timeout isn't NULL, don't read anything but command input.
*
* If interrupted, go back and check to see what it was.
*/
if (timeout != NULL) {
if (F_ISSET(sp, S_SCRIPT))
FD_CLR(sp->script->sh_master, &sp->rdfd);
FD_SET(STDIN_FILENO, &sp->rdfd);
for (;;) {
switch (select(STDIN_FILENO + 1,
&sp->rdfd, NULL, NULL, timeout)) {
case -1: /* Error or interrupt. */
if (errno == EINTR)
goto sigchk;
goto err;
case 1: /* Characters ready. */
break;
case 0: /* Timeout. */
return (INP_OK);
}
break;
}
}
/*
* 3: At this point, we'll take anything that comes. Select on the
* command file descriptor and the file descriptor for the script
* window if there is one. Poll the fd's, increasing the timeout
* each time each time we don't get anything until we're blocked
* on I/O.
*
* If interrupted, go back and check to see what it was.
*/
for (t.tv_sec = t.tv_usec = 0;;) {
/*
* Reset each time -- sscr_input() may call other
* routines which could reset bits.
*/
if (timeout == NULL && F_ISSET(sp, S_SCRIPT)) {
tp = &t;
FD_SET(STDIN_FILENO, &sp->rdfd);
if (F_ISSET(sp, S_SCRIPT)) {
FD_SET(sp->script->sh_master, &sp->rdfd);
maxfd =
MAX(STDIN_FILENO, sp->script->sh_master);
} else
maxfd = STDIN_FILENO;
} else {
tp = NULL;
FD_SET(STDIN_FILENO, &sp->rdfd);
if (F_ISSET(sp, S_SCRIPT))
FD_CLR(sp->script->sh_master, &sp->rdfd);
maxfd = STDIN_FILENO;
}
switch (select(maxfd + 1, &sp->rdfd, NULL, NULL, tp)) {
case -1: /* Error or interrupt. */
if (errno == EINTR)
goto sigchk;
err: msgq(sp, M_SYSERR, "select");
return (INP_ERR);
case 0: /* Timeout. */
if (t.tv_usec) {
++t.tv_sec;
t.tv_usec = 0;
} else
t.tv_usec += 500000;
continue;
}
if (timeout == NULL && F_ISSET(sp, S_SCRIPT) &&
FD_ISSET(sp->script->sh_master, &sp->rdfd)) {
sscr_input(sp);
continue;
}
switch (nr = read(STDIN_FILENO,
tty->ch + tty->next + tty->cnt,
tty->nelem - (tty->next + tty->cnt))) {
case 0: /* EOF. */
return (INP_EOF);
case -1: /* Error or interrupt. */
if (errno == EINTR)
goto sigchk;
msgq(sp, M_SYSERR, "read");
return (INP_ERR);
default:
goto success;
}
/* NOTREACHED */
}
success:
MEMSET(tty->chf + tty->next + tty->cnt, 0, nr);
tty->cnt += *nrp = nr;
return (INP_OK);
}