NetBSD-5.0.2/dist/nvi/cl/cl_read.c
/* $NetBSD: cl_read.c,v 1.1.1.2.6.1 2009/01/20 02:41:11 snj Exp $ */
/*-
* Copyright (c) 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1993, 1994, 1995, 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "Id: cl_read.c,v 10.29 2001/08/18 21:51:59 skimo Exp (Berkeley) Date: 2001/08/18 21:51:59";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <sys/time.h>
#include <bitstring.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "../common/common.h"
#include "../ex/script.h"
#include "cl.h"
/* Pollution by Solaris curses. */
#undef columns
#undef lines
static input_t cl_read __P((SCR *,
u_int32_t, char *, size_t, int *, struct timeval *));
static int cl_resize __P((SCR *, size_t, size_t));
/*
* cl_event --
* Return a single event.
*
* PUBLIC: int cl_event __P((SCR *, EVENT *, u_int32_t, int));
*/
int
cl_event(SCR *sp, EVENT *evp, u_int32_t flags, int ms)
{
struct timeval t, *tp;
CL_PRIVATE *clp;
size_t lines, columns;
int changed, nr = 0;
const CHAR_T *wp;
size_t wlen;
int rc;
/*
* Queue signal based events. We never clear SIGHUP or SIGTERM events,
* so that we just keep returning them until the editor dies.
*/
clp = CLP(sp);
retest: if (LF_ISSET(EC_INTERRUPT) || F_ISSET(clp, CL_SIGINT)) {
if (F_ISSET(clp, CL_SIGINT)) {
F_CLR(clp, CL_SIGINT);
evp->e_event = E_INTERRUPT;
} else
evp->e_event = E_TIMEOUT;
return (0);
}
if (F_ISSET(clp, CL_SIGHUP | CL_SIGTERM | CL_SIGWINCH)) {
if (F_ISSET(clp, CL_SIGHUP)) {
evp->e_event = E_SIGHUP;
return (0);
}
if (F_ISSET(clp, CL_SIGTERM)) {
evp->e_event = E_SIGTERM;
return (0);
}
if (F_ISSET(clp, CL_SIGWINCH)) {
F_CLR(clp, CL_SIGWINCH);
if (cl_ssize(sp, 1, &lines, &columns, &changed))
return (1);
if (changed) {
(void)cl_resize(sp, lines, columns);
evp->e_event = E_WRESIZE;
return (0);
}
/* No real change, ignore the signal. */
}
}
/* Set timer. */
if (ms == 0)
tp = NULL;
else {
t.tv_sec = ms / 1000;
t.tv_usec = (ms % 1000) * 1000;
tp = &t;
}
/* Read input characters. */
read:
switch (cl_read(sp, LF_ISSET(EC_QUOTED | EC_RAW),
clp->ibuf + clp->skip, SIZE(clp->ibuf) - clp->skip, &nr, tp)) {
case INP_OK:
rc = INPUT2INT5(sp, clp->cw, clp->ibuf, nr + clp->skip,
wp, wlen);
evp->e_csp = __UNCONST(wp);
evp->e_len = wlen;
evp->e_event = E_STRING;
if (rc < 0) {
int n = -rc;
memmove(clp->ibuf, clp->ibuf + nr + clp->skip - n, n);
clp->skip = n;
if (wlen == 0)
goto read;
} else if (rc == 0)
clp->skip = 0;
else
msgq(sp, M_ERR, "323|Invalid input. Truncated.");
break;
case INP_ERR:
evp->e_event = E_ERR;
break;
case INP_EOF:
evp->e_event = E_EOF;
break;
case INP_INTR:
goto retest;
case INP_TIMEOUT:
evp->e_event = E_TIMEOUT;
break;
default:
abort();
}
return (0);
}
/*
* cl_read --
* Read characters from the input.
*/
static input_t
cl_read(SCR *sp, u_int32_t flags, char *bp, size_t blen, int *nrp, struct timeval *tp)
{
struct termios term1, term2;
struct timeval poll;
CL_PRIVATE *clp;
GS *gp;
fd_set rdfd;
input_t rval;
int maxfd, nr, term_reset;
gp = sp->gp;
clp = CLP(sp);
term_reset = 0;
/*
* 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(clp, CL_STDIN_TTY)) {
switch (nr = read(STDIN_FILENO, bp, blen)) {
case 0:
return (INP_EOF);
case -1:
goto err;
default:
*nrp = nr;
return (INP_OK);
}
/* NOTREACHED */
}
/*
* 2: A read with an associated timeout, e.g., trying to complete
* a map sequence. If input exists, we fall into #3.
*/
FD_ZERO(&rdfd);
poll.tv_sec = 0;
poll.tv_usec = 0;
if (tp != NULL) {
FD_SET(STDIN_FILENO, &rdfd);
switch (select(STDIN_FILENO + 1,
&rdfd, NULL, NULL, tp == NULL ? &poll : tp)) {
case 0:
return (INP_TIMEOUT);
case -1:
goto err;
default:
break;
}
}
/*
* The user can enter a key in the editor to quote a character. If we
* get here and the next key is supposed to be quoted, do what we can.
* Reset the tty so that the user can enter a ^C, ^Q, ^S. There's an
* obvious race here, when the key has already been entered, but there's
* nothing that we can do to fix that problem.
*
* The editor can ask for the next literal character even thought it's
* generally running in line-at-a-time mode. Do what we can.
*/
if (LF_ISSET(EC_QUOTED | EC_RAW) && !tcgetattr(STDIN_FILENO, &term1)) {
term_reset = 1;
if (LF_ISSET(EC_QUOTED)) {
term2 = term1;
term2.c_lflag &= ~ISIG;
term2.c_iflag &= ~(IXON | IXOFF);
(void)tcsetattr(STDIN_FILENO,
TCSASOFT | TCSADRAIN, &term2);
} else
(void)tcsetattr(STDIN_FILENO,
TCSASOFT | TCSADRAIN, &clp->vi_enter);
}
/*
* 3: Wait for input.
*
* Select on the command input and scripting window file descriptors.
* It's ugly that we wait on scripting file descriptors here, but it's
* the only way to keep from locking out scripting windows.
*/
if (F_ISSET(gp, G_SCRWIN)) {
FD_ZERO(&rdfd);
FD_SET(STDIN_FILENO, &rdfd);
maxfd = STDIN_FILENO;
if (sscr_check_input(sp, &rdfd, maxfd))
goto err;
}
/*
* 4: Read the input.
*
* !!!
* What's going on here is some scary stuff. Ex runs the terminal in
* canonical mode. So, the <newline> character terminating a line of
* input is returned in the buffer, but a trailing <EOF> character is
* not similarly included. As ex uses 0<EOF> and ^<EOF> as autoindent
* commands, it has to see the trailing <EOF> characters to determine
* the difference between the user entering "0ab" and "0<EOF>ab". We
* leave an extra slot in the buffer, so that we can add a trailing
* <EOF> character if the buffer isn't terminated by a <newline>. We
* lose if the buffer is too small for the line and exactly N characters
* are entered followed by an <EOF> character.
*/
#define ONE_FOR_EOF 1
switch (nr = read(STDIN_FILENO, bp, blen - ONE_FOR_EOF)) {
case 0: /* EOF. */
/*
* ^D in canonical mode returns a read of 0, i.e. EOF. EOF is
* a valid command, but we don't want to loop forever because
* the terminal driver is returning EOF because the user has
* disconnected. The editor will almost certainly try to write
* something before this fires, which should kill us, but You
* Never Know.
*/
if (++clp->eof_count < 50) {
bp[0] = clp->orig.c_cc[VEOF];
*nrp = 1;
rval = INP_OK;
} else
rval = INP_EOF;
break;
case -1: /* Error or interrupt. */
err: if (errno == EINTR)
rval = INP_INTR;
else {
rval = INP_ERR;
msgq(sp, M_SYSERR, "input");
}
break;
default: /* Input characters. */
if (F_ISSET(sp, SC_EX) && bp[nr - 1] != '\n')
bp[nr++] = clp->orig.c_cc[VEOF];
*nrp = nr;
clp->eof_count = 0;
rval = INP_OK;
break;
}
/* Restore the terminal state if it was modified. */
if (term_reset)
(void)tcsetattr(STDIN_FILENO, TCSASOFT | TCSADRAIN, &term1);
return (rval);
}
/*
* cl_resize --
* Reset the options for a resize event.
*/
static int
cl_resize(SCR *sp, size_t lines, size_t columns)
{
int rval;
rval = api_opts_set(sp, L("lines"), NULL, lines, 0);
if (api_opts_set(sp, L("columns"), NULL, columns, 0))
rval = 1;
return (rval);
}