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/*
* Copyright (c) 2017 Anton Lindqvist <anton@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <err.h>
#include <errno.h>
#include <poll.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include <util.h>
static void sigchld(int);
static void __dead usage(void);
static volatile sig_atomic_t gotsigchld;
int
main(int argc, char *argv[])
{
char in[BUFSIZ], out[BUFSIZ];
struct pollfd pfd;
struct winsize ws;
pid_t pid;
ssize_t n;
size_t nin, nread, nwrite;
int nready, ptyfd;
if (argc < 2)
usage();
nin = 0;
for (;;) {
if (nin == sizeof(in))
errx(1, "input buffer too small");
n = read(0, &in[nin], sizeof(in) - nin);
if (n == -1)
err(1, "read");
if (n == 0)
break;
nin += n;
}
if (signal(SIGCHLD, sigchld) == SIG_ERR)
err(1, "signal");
memset(&ws, 0, sizeof(ws));
ws.ws_col = 80,
ws.ws_row = 24;
pid = forkpty(&ptyfd, NULL, NULL, &ws);
if (pid == -1)
err(1, "forkpty");
if (pid == 0) {
execvp(argv[1], &argv[1]);
err(1, "%s", argv[1]);
}
nread = nwrite = 0;
pfd.fd = ptyfd;
pfd.events = (POLLIN | POLLOUT);
while (!gotsigchld) {
nready = poll(&pfd, 1, 10);
if (nready == -1) {
if (errno == EINTR)
continue;
err(1, "poll");
}
if (nready == 0)
break; /* timeout */
if (pfd.revents & (POLLERR | POLLNVAL))
errc(1, EBADF, NULL);
if (pfd.revents & (POLLIN | POLLHUP)) {
if (nread == sizeof(out))
errx(1, "output buffer too small");
n = read(ptyfd, &out[nread], sizeof(out) - nread);
if (n == -1)
err(1, "read");
nread += n;
} else if (pfd.revents & POLLOUT) {
if (nread == 0)
continue;
n = write(ptyfd, &in[nwrite], nin - nwrite);
if (n == -1)
err(1, "write");
nwrite += n;
if (nwrite == nin)
pfd.events &= ~(POLLOUT);
}
}
close(ptyfd);
printf("%.*s\n", (int)nread, out);
return 0;
}
static void
sigchld(int sig)
{
gotsigchld = sig == SIGCHLD;
}
static void __dead
usage(void)
{
fprintf(stderr, "usage: edit command [args]\n");
exit(1);
}
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