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/* Copyright (c) 2018, Curtis McEnroe <programble@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sysexits.h>
#include <unistd.h>
static struct {
int read;
int write;
} winch;
static void sigwinch() {
struct winsize localWindow;
int error = ioctl(STDERR_FILENO, TIOCGWINSZ, &localWindow);
if (error) err(EX_IOERR, "ioctl(%d, TIOCGWINSZ, ...)", STDERR_FILENO);
ssize_t size = write(winch.write, &localWindow, sizeof(localWindow));
if (size < 0) err(EX_IOERR, "write(%d)", winch.write);
if ((size_t)size < sizeof(localWindow)) {
errx(EX_IOERR, "short write(%d)", winch.write);
}
}
int main(int argc, char *argv[]) {
if (argc < 2) return EX_USAGE;
const char *path = argv[1];
int fd = open(path, O_RDONLY);
if (fd < 0) err(EX_NOINPUT, "%s", path);
struct winsize remoteWindow;
ssize_t size = read(fd, &remoteWindow, sizeof(remoteWindow));
if (size < 0) err(EX_IOERR, "%s", path);
if ((size_t)size < sizeof(remoteWindow)) errx(EX_IOERR, "%s: short read", path);
int error = pipe((int *)&winch);
if (error) err(EX_OSERR, "pipe");
signal(SIGWINCH, sigwinch);
sigwinch();
for (;;) {
struct winsize localWindow;
ssize_t size = read(winch.read, &localWindow, sizeof(localWindow));
if (size < 0) err(EX_IOERR, "read(%d)", winch.read);
if ((size_t)size < sizeof(localWindow)) {
errx(EX_IOERR, "short read(%d)", winch.read);
}
if (
localWindow.ws_col == remoteWindow.ws_col
&& localWindow.ws_row == remoteWindow.ws_row
) break;
printf(
"%hux%hu -> %hux%hu\n",
localWindow.ws_col, localWindow.ws_row,
remoteWindow.ws_col, remoteWindow.ws_row
);
}
}
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