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/* $OpenBSD: edit.c,v 1.7 2017/11/21 19:22:45 anton Exp $ */
/*
* 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 <sys/wait.h>
#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>
#define WRTIM 50 /* input write timeout */
#define PRTIM 5000 /* prompt read timeout */
static size_t findprompt(const char *, const char *);
static void sighandler(int);
static void __dead usage(void);
static volatile sig_atomic_t gotsig;
int
main(int argc, char *argv[])
{
const char *linefeed = "\003\004\n\r";
const char *prompt = "";
char in[BUFSIZ], out[BUFSIZ];
struct pollfd pfd;
struct winsize ws;
pid_t pid;
ssize_t n;
size_t nin, nprompt, nread, nwrite;
int c, nready, ptyfd, readprompt, ret, status, timeout;
while ((c = getopt(argc, argv, "p:")) != -1) {
switch (c) {
case 'p':
prompt = optarg;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc == 0 || strlen(prompt) == 0)
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, sighandler) == SIG_ERR)
err(1, "signal: SIGCHLD");
if (signal(SIGINT, sighandler) == SIG_ERR)
err(1, "signal: SIGINT");
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, argv);
err(1, "%s", *argv);
}
nprompt = nread = nwrite = ret = 0;
readprompt = 1;
while (!gotsig) {
pfd.fd = ptyfd;
if (!readprompt && nwrite < nin)
pfd.events = POLLOUT;
else
pfd.events = POLLIN;
timeout = readprompt ? PRTIM : WRTIM;
nready = poll(&pfd, 1, timeout);
if (nready == -1) {
if (errno == EINTR)
continue;
err(1, "poll");
}
if (nready == 0) {
if (timeout == PRTIM)
ret = 1;
break;
}
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) - 1 - nread);
if (n == -1)
err(1, "read");
nread += n;
out[nread] = '\0';
if (readprompt &&
(n = findprompt(out + nprompt, prompt)) > 0) {
nprompt += n;
readprompt = 0;
}
} else if (pfd.revents & POLLOUT) {
if (strchr(linefeed, in[nwrite]) != NULL)
readprompt = 1;
n = write(ptyfd, in + nwrite, 1);
if (n == -1)
err(1, "write");
nwrite += n;
}
}
close(ptyfd);
while (waitpid(pid, &status, 0) == -1)
if (errno != EINTR)
err(1, "waitpid");
if (WIFSIGNALED(status) && WTERMSIG(status) != SIGHUP) {
warnx("%s: terminated by signal %d", *argv, WTERMSIG(status));
ret = 128 + WTERMSIG(status);
}
printf("%.*s", (int)nread, out);
return ret;
}
static size_t
findprompt(const char *str, const char *prompt)
{
char *cp;
size_t len;
if ((cp = strstr(str, prompt)) == NULL)
return 0;
len = strlen(prompt);
return (cp - str) + len;
}
static void
sighandler(int sig)
{
gotsig = sig;
}
static void __dead
usage(void)
{
fprintf(stderr, "usage: edit -p prompt command [args]\n");
exit(1);
}
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