freebsd-dev/contrib/nvi/ip/ip_read.c

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/*-
* Copyright (c) 1996
* Keith Bostic. All rights reserved.
*
* See the LICENSE file for redistribution information.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)ip_read.c 8.3 (Berkeley) 9/24/96";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <bitstring.h>
#include <stdio.h>
#include <termios.h>
#include <time.h>
#include "../common/common.h"
#include "../ex/script.h"
#include "ip.h"
extern GS *__global_list;
typedef enum { INP_OK=0, INP_EOF, INP_ERR, INP_TIMEOUT } input_t;
static input_t ip_read __P((SCR *, IP_PRIVATE *, struct timeval *));
static int ip_resize __P((SCR *, size_t, size_t));
static int ip_trans __P((SCR *, IP_PRIVATE *, EVENT *));
/*
* ip_event --
* Return a single event.
*
* PUBLIC: int ip_event __P((SCR *, EVENT *, u_int32_t, int));
*/
int
ip_event(sp, evp, flags, ms)
SCR *sp;
EVENT *evp;
u_int32_t flags;
int ms;
{
IP_PRIVATE *ipp;
struct timeval t, *tp;
if (LF_ISSET(EC_INTERRUPT)) { /* XXX */
evp->e_event = E_TIMEOUT;
return (0);
}
ipp = sp == NULL ? GIPP(__global_list) : IPP(sp);
/* Discard the last command. */
if (ipp->iskip != 0) {
ipp->iblen -= ipp->iskip;
memmove(ipp->ibuf, ipp->ibuf + ipp->iskip, ipp->iblen);
ipp->iskip = 0;
}
/* Set timer. */
if (ms == 0)
tp = NULL;
else {
t.tv_sec = ms / 1000;
t.tv_usec = (ms % 1000) * 1000;
tp = &t;
}
/* Read input events. */
for (;;) {
switch (ip_read(sp, ipp, tp)) {
case INP_OK:
if (!ip_trans(sp, ipp, evp))
continue;
break;
case INP_EOF:
evp->e_event = E_EOF;
break;
case INP_ERR:
evp->e_event = E_ERR;
break;
case INP_TIMEOUT:
evp->e_event = E_TIMEOUT;
break;
default:
abort();
}
break;
}
return (0);
}
/*
* ip_read --
* Read characters from the input.
*/
static input_t
ip_read(sp, ipp, tp)
SCR *sp;
IP_PRIVATE *ipp;
struct timeval *tp;
{
struct timeval poll;
GS *gp;
SCR *tsp;
fd_set rdfd;
input_t rval;
size_t blen;
int maxfd, nr;
char *bp;
gp = sp == NULL ? __global_list : sp->gp;
bp = ipp->ibuf + ipp->iblen;
blen = sizeof(ipp->ibuf) - ipp->iblen;
/*
* 1: A read with an associated timeout, e.g., trying to complete
* a map sequence. If input exists, we fall into #2.
*/
FD_ZERO(&rdfd);
poll.tv_sec = 0;
poll.tv_usec = 0;
if (tp != NULL) {
FD_SET(ipp->i_fd, &rdfd);
switch (select(ipp->i_fd + 1,
&rdfd, NULL, NULL, tp == NULL ? &poll : tp)) {
case 0:
return (INP_TIMEOUT);
case -1:
goto err;
default:
break;
}
}
/*
* 2: 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 (sp != NULL && F_ISSET(gp, G_SCRWIN)) {
loop: FD_ZERO(&rdfd);
FD_SET(ipp->i_fd, &rdfd);
maxfd = ipp->i_fd;
for (tsp = gp->dq.cqh_first;
tsp != (void *)&gp->dq; tsp = tsp->q.cqe_next)
if (F_ISSET(sp, SC_SCRIPT)) {
FD_SET(sp->script->sh_master, &rdfd);
if (sp->script->sh_master > maxfd)
maxfd = sp->script->sh_master;
}
switch (select(maxfd + 1, &rdfd, NULL, NULL, NULL)) {
case 0:
abort();
case -1:
goto err;
default:
break;
}
if (!FD_ISSET(ipp->i_fd, &rdfd)) {
if (sscr_input(sp))
return (INP_ERR);
goto loop;
}
}
/*
* 3: Read the input.
*/
switch (nr = read(ipp->i_fd, bp, blen)) {
case 0: /* EOF. */
rval = INP_EOF;
break;
case -1: /* Error or interrupt. */
err: rval = INP_ERR;
msgq(sp, M_SYSERR, "input");
break;
default: /* Input characters. */
ipp->iblen += nr;
rval = INP_OK;
break;
}
return (rval);
}
/*
* ip_trans --
* Translate messages into events.
*/
static int
ip_trans(sp, ipp, evp)
SCR *sp;
IP_PRIVATE *ipp;
EVENT *evp;
{
u_int32_t val1, val2;
switch (ipp->ibuf[0]) {
case IPO_EOF:
evp->e_event = E_EOF;
ipp->iskip = IPO_CODE_LEN;
return (1);
case IPO_ERR:
evp->e_event = E_ERR;
ipp->iskip = IPO_CODE_LEN;
return (1);
case IPO_INTERRUPT:
evp->e_event = E_INTERRUPT;
ipp->iskip = IPO_CODE_LEN;
return (1);
case IPO_QUIT:
evp->e_event = E_QUIT;
ipp->iskip = IPO_CODE_LEN;
return (1);
case IPO_RESIZE:
if (ipp->iblen < IPO_CODE_LEN + IPO_INT_LEN * 2)
return (0);
evp->e_event = E_WRESIZE;
memcpy(&val1, ipp->ibuf + IPO_CODE_LEN, IPO_INT_LEN);
val1 = ntohl(val1);
memcpy(&val2,
ipp->ibuf + IPO_CODE_LEN + IPO_INT_LEN, IPO_INT_LEN);
val2 = ntohl(val2);
ip_resize(sp, val1, val2);
ipp->iskip = IPO_CODE_LEN + IPO_INT_LEN * 2;
return (1);
case IPO_SIGHUP:
evp->e_event = E_SIGHUP;
ipp->iskip = IPO_CODE_LEN;
return (1);
case IPO_SIGTERM:
evp->e_event = E_SIGTERM;
ipp->iskip = IPO_CODE_LEN;
return (1);
case IPO_STRING:
evp->e_event = E_STRING;
string: if (ipp->iblen < IPO_CODE_LEN + IPO_INT_LEN)
return (0);
memcpy(&val1, ipp->ibuf + IPO_CODE_LEN, IPO_INT_LEN);
val1 = ntohl(val1);
if (ipp->iblen < IPO_CODE_LEN + IPO_INT_LEN + val1)
return (0);
ipp->iskip = IPO_CODE_LEN + IPO_INT_LEN + val1;
evp->e_csp = ipp->ibuf + IPO_CODE_LEN + IPO_INT_LEN;
evp->e_len = val1;
return (1);
case IPO_WRITE:
evp->e_event = E_WRITE;
ipp->iskip = IPO_CODE_LEN;
return (1);
default:
/*
* XXX: Protocol is out of sync?
*/
abort();
}
/* NOTREACHED */
}
/*
* ip_resize --
* Reset the options for a resize event.
*/
static int
ip_resize(sp, lines, columns)
SCR *sp;
size_t lines, columns;
{
GS *gp;
ARGS *argv[2], a, b;
char b1[1024];
/*
* XXX
* The IP screen has to know the lines and columns before anything
* else happens. So, we may not have a valid SCR pointer, and we
* have to deal with that.
*/
if (sp == NULL) {
gp = __global_list;
OG_VAL(gp, GO_LINES) = OG_D_VAL(gp, GO_LINES) = lines;
OG_VAL(gp, GO_COLUMNS) = OG_D_VAL(gp, GO_COLUMNS) = columns;
return (0);
}
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);
}