mirror of https://github.com/sudo-project/sudo.git
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2010-2012, 2014-2015, 2023 Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <sys/ioctl.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <termios.h> /* for struct winsize on HP-UX */
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#include <limits.h>
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#include <sudo_compat.h>
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#include <sudo_debug.h>
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#include <sudo_util.h>
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static int
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get_ttysize_ioctl(int fd, int *rowp, int *colp)
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{
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struct winsize wsize;
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debug_decl(get_ttysize_ioctl, SUDO_DEBUG_UTIL);
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if (fd != -1 && sudo_isatty(fd, NULL)) {
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if (ioctl(fd, TIOCGWINSZ, &wsize) == 0) {
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if (wsize.ws_row != 0 && wsize.ws_col != 0) {
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*rowp = wsize.ws_row;
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*colp = wsize.ws_col;
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debug_return_int(0);
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}
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}
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}
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debug_return_int(-1);
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}
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void
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sudo_get_ttysize_v1(int *rowp, int *colp)
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{
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sudo_get_ttysize_v2(STDERR_FILENO, rowp, colp);
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}
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void
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sudo_get_ttysize_v2(int fd, int *rowp, int *colp)
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{
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debug_decl(sudo_get_ttysize, SUDO_DEBUG_UTIL);
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if (get_ttysize_ioctl(fd, rowp, colp) == -1) {
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char *p;
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/* Fall back on $LINES and $COLUMNS. */
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if ((p = getenv("LINES")) == NULL ||
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(*rowp = (int)sudo_strtonum(p, 1, INT_MAX, NULL)) <= 0) {
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*rowp = 24;
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}
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if ((p = getenv("COLUMNS")) == NULL ||
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(*colp = (int)sudo_strtonum(p, 1, INT_MAX, NULL)) <= 0) {
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*colp = 80;
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}
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}
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debug_return;
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}
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