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NVI179B
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cl
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cl_read.c
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C/C++ Source or Header
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1997-06-27
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12KB
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500 lines
/*-
* 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[] = "@(#)cl_read.c 10.15 (Berkeley) 9/24/96";
#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 <curses.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"
static input_t cl_read __P((SCR *,
u_int32_t, CHAR_T *, size_t, int *, struct timeval *));
static int cl_resize __P((SCR *, size_t, size_t));
#ifdef __EMX__
#ifdef EMX_MOUSE
static int mou_read __P((SCR *, char *, int));
#endif
#endif
/*
* cl_event --
* Return a single event.
*
* PUBLIC: int cl_event __P((SCR *, EVENT *, u_int32_t, int));
*/
int
cl_event(sp, evp, flags, ms)
SCR *sp;
EVENT *evp;
u_int32_t flags;
int ms;
{
struct timeval t, *tp;
CL_PRIVATE *clp;
size_t lines, columns;
int changed, nr;
/*
* 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. */
switch (cl_read(sp, LF_ISSET(EC_QUOTED | EC_RAW),
clp->ibuf, sizeof(clp->ibuf), &nr, tp)) {
case INP_OK:
evp->e_csp = clp->ibuf;
evp->e_len = nr;
evp->e_event = E_STRING;
break;
case INP_EOF:
evp->e_event = E_EOF;
break;
case INP_ERR:
evp->e_event = E_ERR;
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(sp, flags, bp, blen, nrp, tp)
SCR *sp;
u_int32_t flags;
CHAR_T *bp;
size_t blen;
int *nrp;
struct timeval *tp;
{
struct termios term1, term2;
struct timeval poll;
CL_PRIVATE *clp;
GS *gp;
SCR *tsp;
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 defined(__EMX__) && defined(EMX_MOUSE)
if ((clp->mou_pipe != -1 && !term_reset) || F_ISSET(gp, G_SCRWIN)) {
#else
if (F_ISSET(gp, G_SCRWIN)) {
#endif
loop: FD_ZERO(&rdfd);
FD_SET(STDIN_FILENO, &rdfd);
maxfd = STDIN_FILENO;
#ifdef __EMX__
#ifdef EMX_MOUSE
if (clp->mou_pipe != -1)
{
FD_SET(clp->mou_pipe, &rdfd);
if (clp->mou_pipe > maxfd)
maxfd = clp->mou_pipe;
}
#endif
#endif
for (tsp = gp->dq.cqh_first;
tsp != (void *)&gp->dq; tsp = tsp->q.cqe_next)
if (F_ISSET(sp, SC_SCRIPT)) {
#if VI_DOSISH
FD_SET(sp->script->sh_master >> 16, &rdfd);
if ((sp->script->sh_master >> 16) > maxfd)
maxfd = sp->script->sh_master >> 16;
#else
FD_SET(sp->script->sh_master, &rdfd);
if (sp->script->sh_master > maxfd)
maxfd = sp->script->sh_master;
#endif
}
switch (select(maxfd + 1, &rdfd, NULL, NULL, NULL)) {
case 0:
abort();
case -1:
goto err;
default:
break;
}
if (!FD_ISSET(STDIN_FILENO, &rdfd)) {
#ifdef __EMX__
#ifdef EMX_MOUSE
if (FD_ISSET(clp->mou_pipe, &rdfd))
{
if ((nr = mou_read(sp, bp, blen)) == -1)
{
close(clp->mou_pipe);
clp->mou_pipe = -1;
}
else if (nr > 0)
{
*nrp = nr;
clp->eof_count = 0;
return INP_OK;
}
}
else
#endif
#endif
if (sscr_input(sp))
return (INP_ERR);
goto loop;
}
}
/*
* 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(sp, lines, columns)
SCR *sp;
size_t lines, columns;
{
ARGS *argv[2], a, b;
char b1[1024];
a.bp = b1;
b.bp = NULL;
a.len = b.len = 0;
argv[0] = &a;
argv[1] = &b;
(void)snprintf(b1, sizeof(b1), "lines=%lu", (u_long)lines);
a.len = strlen(b1);
if (opts_set(sp, argv, NULL))
return (1);
(void)snprintf(b1, sizeof(b1), "columns=%lu", (u_long)columns);
a.len = strlen(b1);
if (opts_set(sp, argv, NULL))
return (1);
return (0);
}
#ifdef __EMX__
#ifdef EMX_MOUSE
/*
* mou_read --
* Read a "digested" mouse event and return a command string.
* For now, all mouse buttons are equivalent and we only generate
* movement commands. Said commands are not optimized.
*/
static int mou_read(sp, bp, len)
SCR *sp;
char *bp;
int len;
{
struct msev ev;
char xbuf[sizeof ev];
int c, f;
CL_PRIVATE *clp;
GS *gp;
SCR *n;
gp = sp->gp;
clp = CLP(sp);
c = 0;
while (c + (f = read(clp->mou_pipe, xbuf + c, sizeof ev - c)) < sizeof ev)
{
if (f == -1)
return -1;
c += f;
}
memcpy(&ev, xbuf, sizeof ev);
if (!F_SET(sp, SC_VI)) /* mouse actions only in vi */
return 0;
/*
* This gets fairly disgusting. First, we have to escape out of any
* insert etc. mode. Then we have to check to see if we're switching
* screens; then we have to position within the screen. If this lands
* us in a prompt area, we push a colon command instead. If not, we
* must reestablish the previous input mode. And if we run out of space
* doing any of this, we beep and return 0.
*
* !!!
* No attempt is made to deal with mapped keys; we're called at too low
* a level. Likewise, invoking this when a motion is expected to complete
* a command will fail. Fixing this would pretty much require a new,
* magic "go directly to specified screen R/C" command and, again, we are
* at too low a level to pull it off.
*/
c = 0;
if (sp->showmode != SM_COMMAND)
{
/* escape to command mode */
*bp++ = '\033';
len--;
c++;
}
for (n = sp, f = 0; n != sp || !f; n = n->q.cqe_next, f = 1)
{
if (n->woff <= ev.y && n->woff + n->rows > ev.y)
break;
if (!len)
break;
*bp++ = '\027'; /* ^W */
len--;
c++;
}
if (!len)
return 0;
if (n->woff + n->rows - 1 == ev.y)
{
/* enter command mode */
*bp = ':';
return c + 1;
}
/* now we have to figure out where in the window we are... */
/* getting current screen position is a lost cause, it seems */
ev.y -= n->woff - 1;
if (len < 1 + (ev.y == 1? 0: ev.y < 10? 1: ev.y < 100? 2: 3))
return 0;
if (ev.y != 1)
{
sprintf(bp, "%d", ev.y);
while (*bp)
{
bp++;
len--;
c++;
}
}
*bp++ = 'H';
len--;
c++;
/*
* The columns are really fun, because tabs and non-ASCII throw them off.
* And we can't "see" the file to know what to do. :-(
* We just use '0' and/or '|' and hope.
*/
ev.x++;
if (len < 1 + (ev.x == 1? 0: ev.x < 10? 1: ev.x < 100? 2: 3))
return 0;
if (ev.x == 1)
{
*bp++ = '0';
len--;
c++;
}
else
{
sprintf(bp, "%d|", ev.x);
while (*bp)
{
bp++;
len--;
c++;
}
}
return c;
}
#endif
#endif