1 files changed, 80 insertions, 0 deletions
diff --git a/lib/util/ttysize.c b/lib/util/ttysize.c
new file mode 100644
index 0000000..0b582d0
--- /dev/null
+++ b/lib/util/ttysize.c
@@ -0,0 +1,80 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2010-2012, 2014-2015, 2023 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/ioctl.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 fd, int *rowp, int *colp)
+{
+    struct winsize wsize;
+    debug_decl(get_ttysize_ioctl, SUDO_DEBUG_UTIL);
+
+    if (fd != -1 && sudo_isatty(fd, NULL)) {
+	if (ioctl(fd, TIOCGWINSZ, &wsize) == 0) {
+	    if (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)
+{
+    sudo_get_ttysize_v2(STDERR_FILENO, rowp, colp);
+}
+
+void
+sudo_get_ttysize_v2(int fd, int *rowp, int *colp)
+{
+    debug_decl(sudo_get_ttysize, SUDO_DEBUG_UTIL);
+
+    if (get_ttysize_ioctl(fd, rowp, colp) == -1) {
+	char *p;
+
+	/* Fall back on $LINES and $COLUMNS. */
+	if ((p = getenv("LINES")) == NULL ||
+	    (*rowp = (int)sudo_strtonum(p, 1, INT_MAX, NULL)) <= 0) {
+	    *rowp = 24;
+	}
+	if ((p = getenv("COLUMNS")) == NULL ||
+	    (*colp = (int)sudo_strtonum(p, 1, INT_MAX, NULL)) <= 0) {
+	    *colp = 80;
+	}
+    }
+
+    debug_return;
+}