159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
/*
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* resizewin
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*
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* Query terminal for size and inform the kernel
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*
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* Copyright 2015 EMC / Isilon Storage Division
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <strings.h>
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#include <termios.h>
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#include <unistd.h>
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/* screen doesn't support ESC[18t (return terminal size) so do it the hard way */
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static const char query[] =
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"\0337" /* Save cursor position */
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"\033[r" /* Scroll whole screen */
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"\033[999;999H" /* Move cursor */
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"\033[6n" /* Get cursor position */
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"\0338"; /* Restore cursor position */
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static void
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usage(void)
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{
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fprintf(stderr, "usage: resizewin [-z]\n");
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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struct termios old, new;
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struct winsize w;
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struct timeval then, now;
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char data[20];
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int ch, cnt, error, fd, ret, zflag;
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error = 0;
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zflag = 0;
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while ((ch = getopt(argc, argv, "z")) != -1) {
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switch (ch) {
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case 'z':
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zflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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if (argc != 0)
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usage();
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if ((fd = open("/dev/tty", O_RDWR | O_NONBLOCK)) == -1)
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exit(1);
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if (zflag) {
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if (ioctl(fd, TIOCGWINSZ, &w) == -1)
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exit(1);
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if (w.ws_row != 0 && w.ws_col != 0)
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exit(0);
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}
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/* Disable echo, flush the input, and drain the output */
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if (tcgetattr(fd, &old) == -1)
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exit(1);
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new = old;
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new.c_cflag |= (CLOCAL | CREAD);
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new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
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if (tcsetattr(fd, TCSAFLUSH, &new) == -1)
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exit(1);
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if (write(fd, query, sizeof(query) - 1) != sizeof(query) - 1) {
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error = 1;
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goto out;
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}
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/* Read the response */
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bzero(data, sizeof(data));
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gettimeofday(&then, NULL);
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cnt = 0;
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while (1) {
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ret = read(fd, data + cnt, 1);
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if (ret == -1) {
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if (errno == EAGAIN) {
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gettimeofday(&now, NULL);
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timersub(&now, &then, &now);
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if (now.tv_sec >= 2) {
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warnx("timeout reading from terminal");
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error = 1;
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goto out;
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}
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usleep(20000);
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continue;
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}
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error = 1;
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goto out;
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}
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if (data[cnt] == 'R')
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break;
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cnt++;
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if (cnt == sizeof(data) - 2) {
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warnx("response too long");
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error = 1;
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goto out;
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}
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}
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/* Parse */
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if (sscanf(data, "\033[%hu;%huR", &w.ws_row, &w.ws_col) != 2) {
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error = 1;
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warnx("unable to parse response");
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goto out;
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}
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/* Finally, what we want */
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if (ioctl(fd, TIOCSWINSZ, &w) == -1)
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error = 1;
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out:
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/* Restore echo */
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tcsetattr(fd, TCSANOW, &old);
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close(fd);
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exit(error);
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}
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