get_window_size.c revision 233294 
1/*
2 * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska H��gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <config.h>
35
36#include <stdlib.h>
37#ifdef HAVE_UNISTD_H
38#include <unistd.h>
39#endif
40#ifdef HAVE_SYS_TYPES_H
41#include <sys/types.h>
42#endif
43
44#if 0 /* Where were those needed? /confused */
45#ifdef HAVE_SYS_PROC_H
46#include <sys/proc.h>
47#endif
48
49#ifdef HAVE_SYS_TTY_H
50#include <sys/tty.h>
51#endif
52#endif
53
54#ifdef HAVE_TERMIOS_H
55#include <termios.h>
56#endif
57
58#include "roken.h"
59
60ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
61get_window_size(int fd, int *lines, int *columns)
62{
63    char *s;
64
65#if defined(TIOCGWINSZ)
66    {
67	struct winsize ws;
68        int ret;
69	ret = ioctl(fd, TIOCGWINSZ, &ws);
70	if (ret != -1) {
71	    if (lines)
72		*lines = ws.ws_row;
73	    if (columns)
74		*columns = ws.ws_col;
75	    return 0;
76	}
77    }
78#elif defined(TIOCGSIZE)
79    {
80	struct ttysize ts;
81        int ret;
82	ret = ioctl(fd, TIOCGSIZE, &ts);
83	if (ret != -1) {
84	    if (lines)
85		*lines = ts.ws_lines;
86	    if (columns)
87		*columns = ts.ts_cols;
88	    return 0;
89 	}
90    }
91#elif defined(HAVE__SCRSIZE)
92    {
93	int dst[2];
94
95 	_scrsize(dst);
96	if (lines)
97	    *lines = dst[1];
98	if (columns)
99	    *columns = dst[0];
100	return 0;
101    }
102#elif defined(_WIN32)
103    {
104        intptr_t fh = 0;
105        CONSOLE_SCREEN_BUFFER_INFO sb_info;
106
107        fh = _get_osfhandle(fd);
108        if (fh != (intptr_t) INVALID_HANDLE_VALUE &&
109            GetConsoleScreenBufferInfo((HANDLE) fh, &sb_info)) {
110            if (lines)
111                *lines = 1 + sb_info.srWindow.Bottom - sb_info.srWindow.Top;
112            if (columns)
113                *columns = 1 + sb_info.srWindow.Right - sb_info.srWindow.Left;
114
115            return 0;
116        }
117    }
118#endif
119    if (columns) {
120    	if ((s = getenv("COLUMNS")))
121	    *columns = atoi(s);
122	else
123	    return -1;
124    }
125    if (lines) {
126	if ((s = getenv("LINES")))
127	    *lines = atoi(s);
128	else
129	    return -1;
130    }
131    return 0;
132}
133