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/* $OpenBSD: get_window_size.c,v 1.1 1998/08/12 23:36:41 art Exp $ */
/* $KTH: get_window_size.c,v 1.6 1998/05/30 21:22:35 joda Exp $ */
/*
* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <termios.h>
int
get_window_size(int fd, struct winsize *wp)
{
char *s;
struct winsize tmp;
int ret = -1;
memset(wp, 0, sizeof(*wp));
memset(&tmp, 0, sizeof(tmp));
if((s = getenv("COLUMNS")))
wp->ws_col = atoi(s);
if((s = getenv("LINES")))
wp->ws_row = atoi(s);
if(wp->ws_col > 0 && wp->ws_row > 0)
return 0;
#if defined(TIOGCWINSZ)
ret = ioctl(fd, TIOGCWINSZ, &tmp);
#elif defined(TIOCGSIZE)
{
struct ttysize ts;
ret = ioctl(fd, TIOCGSIZE, &ts);
if(ret == 0) {
tmp.ws_row = ts.ts_lines;
tmp.ws_row = ts.ts_cols;
tmp.ws_xpixel = 0;
tmp.ws_ypixel = 0;
}
}
#elif defined(HAVE__SCRSIZE)
{
int dst[2];
_scrsize(dst);
tmp.ws_row = dst[1];
tmp.ws_col = dst[0];
tmp.ws_xpixel = 0;
tmp.ws_ypixel = 0;
ret = 0;
}
#endif
if(ret == 0) {
if(wp->ws_col == 0) {
wp->ws_col = tmp.ws_col;
wp->ws_xpixel = tmp.ws_xpixel;
}
if(wp->ws_row == 0) {
wp->ws_row = tmp.ws_row;
wp->ws_ypixel = tmp.ws_ypixel;
}
}
return ret;
}
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