1 /* $NetBSD: get_window_size.c,v 1.5 2023/06/19 21:41:45 christos Exp $ */
2
3 /*
4 * Copyright (c) 1995, 1996, 1997, 1998 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <config.h>
37
38 #include <stdlib.h>
39 #ifdef HAVE_UNISTD_H
40 #include <unistd.h>
41 #endif
42 #ifdef HAVE_SYS_TYPES_H
43 #include <sys/types.h>
44 #endif
45
46 #if 0 /* Where were those needed? /confused */
47 #ifdef HAVE_SYS_PROC_H
48 #include <sys/proc.h>
49 #endif
50
51 #ifdef HAVE_SYS_TTY_H
52 #include <sys/tty.h>
53 #endif
54 #endif
55
56 #ifdef HAVE_TERMIOS_H
57 #include <termios.h>
58 #endif
59
60 #include <krb5/roken.h>
61
62 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
get_window_size(int fd,int * lines,int * columns)63 get_window_size(int fd, int *lines, int *columns)
64 {
65 char *s;
66
67 #if defined(TIOCGWINSZ)
68 {
69 struct winsize ws;
70 int ret;
71 ret = ioctl(fd, TIOCGWINSZ, &ws);
72 if (ret != -1) {
73 if (lines)
74 *lines = ws.ws_row;
75 if (columns)
76 *columns = ws.ws_col;
77 return 0;
78 }
79 }
80 #elif defined(TIOCGSIZE)
81 {
82 struct ttysize ts;
83 int ret;
84 ret = ioctl(fd, TIOCGSIZE, &ts);
85 if (ret != -1) {
86 if (lines)
87 *lines = ts.ws_lines;
88 if (columns)
89 *columns = ts.ts_cols;
90 return 0;
91 }
92 }
93 #elif defined(HAVE__SCRSIZE)
94 {
95 int dst[2];
96
97 _scrsize(dst);
98 if (lines)
99 *lines = dst[1];
100 if (columns)
101 *columns = dst[0];
102 return 0;
103 }
104 #elif defined(_WIN32)
105 {
106 intptr_t fh = 0;
107 CONSOLE_SCREEN_BUFFER_INFO sb_info;
108
109 fh = _get_osfhandle(fd);
110 if (fh != (intptr_t) INVALID_HANDLE_VALUE &&
111 GetConsoleScreenBufferInfo((HANDLE) fh, &sb_info)) {
112 if (lines)
113 *lines = 1 + sb_info.srWindow.Bottom - sb_info.srWindow.Top;
114 if (columns)
115 *columns = 1 + sb_info.srWindow.Right - sb_info.srWindow.Left;
116
117 return 0;
118 }
119 }
120 #endif
121 if (columns) {
122 if ((s = getenv("COLUMNS")))
123 *columns = atoi(s);
124 else
125 return -1;
126 }
127 if (lines) {
128 if ((s = getenv("LINES")))
129 *lines = atoi(s);
130 else
131 return -1;
132 }
133 return 0;
134 }
135