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-rw-r--r--lib/util/ttysize.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/util/ttysize.c b/lib/util/ttysize.c
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+++ b/lib/util/ttysize.c
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+/*
+ * Copyright (c) 2010-2012, 2014-2015 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <termios.h> /* for struct winsize on HP-UX */
+#include <limits.h>
+
+#include "sudo_compat.h"
+#include "sudo_debug.h"
+#include "sudo_util.h"
+
+static int
+get_ttysize_ioctl(int *rowp, int *colp)
+{
+ struct winsize wsize;
+ debug_decl(get_ttysize_ioctl, SUDO_DEBUG_UTIL)
+
+ if (ioctl(STDERR_FILENO, TIOCGWINSZ, &wsize) == 0 &&
+ wsize.ws_row != 0 && wsize.ws_col != 0) {
+ *rowp = wsize.ws_row;
+ *colp = wsize.ws_col;
+ debug_return_int(0);
+ }
+ debug_return_int(-1);
+}
+
+void
+sudo_get_ttysize_v1(int *rowp, int *colp)
+{
+ debug_decl(sudo_get_ttysize, SUDO_DEBUG_UTIL)
+
+ if (get_ttysize_ioctl(rowp, colp) == -1) {
+ char *p;
+
+ /* Fall back on $LINES and $COLUMNS. */
+ if ((p = getenv("LINES")) == NULL ||
+ (*rowp = strtonum(p, 1, INT_MAX, NULL)) <= 0) {
+ *rowp = 24;
+ }
+ if ((p = getenv("COLUMNS")) == NULL ||
+ (*colp = strtonum(p, 1, INT_MAX, NULL)) <= 0) {
+ *colp = 80;
+ }
+ }
+
+ debug_return;
+}