1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 #include "tool_setup.h"
25
26 #ifdef HAVE_SYS_IOCTL_H
27 #include <sys/ioctl.h>
28 #endif
29
30 #include "terminal.h"
31
32 #include "memdebug.h" /* keep this as LAST include */
33
34 #ifdef HAVE_TERMIOS_H
35 # include <termios.h>
36 #elif defined(HAVE_TERMIO_H)
37 # include <termio.h>
38 #endif
39
40 /*
41 * get_terminal_columns() returns the number of columns in the current
42 * terminal. It will return 79 on failure. Also, the number can be big.
43 */
44
get_terminal_columns(void)45 unsigned int get_terminal_columns(void)
46 {
47 unsigned int width = 0;
48 char *colp = curl_getenv("COLUMNS");
49 if(colp) {
50 char *endptr;
51 long num = strtol(colp, &endptr, 10);
52 if((endptr != colp) && (endptr == colp + strlen(colp)) && (num > 20) &&
53 (num < 10000))
54 width = (unsigned int)num;
55 curl_free(colp);
56 }
57
58 if(!width) {
59 int cols = 0;
60
61 #ifdef TIOCGSIZE
62 struct ttysize ts;
63 if(!ioctl(STDIN_FILENO, TIOCGSIZE, &ts))
64 cols = ts.ts_cols;
65 #elif defined(TIOCGWINSZ)
66 struct winsize ts;
67 if(!ioctl(STDIN_FILENO, TIOCGWINSZ, &ts))
68 cols = (int)ts.ws_col;
69 #elif defined(_WIN32) && !defined(CURL_WINDOWS_UWP)
70 {
71 HANDLE stderr_hnd = GetStdHandle(STD_ERROR_HANDLE);
72 CONSOLE_SCREEN_BUFFER_INFO console_info;
73
74 if((stderr_hnd != INVALID_HANDLE_VALUE) &&
75 GetConsoleScreenBufferInfo(stderr_hnd, &console_info)) {
76 /*
77 * Do not use +1 to get the true screen-width since writing a
78 * character at the right edge will cause a line wrap.
79 */
80 cols = (int)
81 (console_info.srWindow.Right - console_info.srWindow.Left);
82 }
83 }
84 #endif /* TIOCGSIZE */
85 if(cols >= 0 && cols < 10000)
86 width = (unsigned int)cols;
87 }
88 if(!width)
89 width = 79;
90 return width; /* 79 for unknown, might also be tiny or enormous */
91 }
92
