Merge tag 'debian/1.8.5p2-1' into squeeze

[debian/sudo] / common / ttysize.c

diff --git a/common/ttysize.c b/common/ttysize.c
new file mode 100644 (file)
index 0000000..d3ac78b
--- /dev/null
+++ b/common/ttysize.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * 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.
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif /* STDC_HEADERS */
+#ifdef HAVE_UNISTD_H
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+#include <termios.h>
+
+#include "missing.h"
+#include "sudo_debug.h"
+
+/* Compatibility with older tty systems. */
+#if !defined(TIOCGWINSZ) && defined(TIOCGSIZE)
+# define TIOCGWINSZ    TIOCGSIZE
+# define winsize       ttysize
+# define ws_col                ts_cols
+# define ws_row                ts_lines
+#endif
+
+#ifdef TIOCGWINSZ
+static int
+get_ttysize_ioctl(int *rowp, int *colp)
+{
+    struct winsize wsize;
+    debug_decl(get_ttysize_ioctl, SUDO_DEBUG_EXEC)
+
+    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);
+}
+#else
+static int
+get_ttysize_ioctl(int *rowp, int *colp)
+{
+    return -1;
+}
+#endif /* TIOCGWINSZ */
+
+void
+get_ttysize(int *rowp, int *colp)
+{
+    debug_decl(fork_cmnd, SUDO_DEBUG_EXEC)
+
+    if (get_ttysize_ioctl(rowp, colp) == -1) {
+       char *p;
+
+       /* Fall back on $LINES and $COLUMNS. */
+       if ((p = getenv("LINES")) == NULL || (*rowp = atoi(p)) <= 0)
+           *rowp = 24;
+       if ((p = getenv("COLUMNS")) == NULL || (*colp = atoi(p)) <= 0)
+           *colp = 80;
+    }
+
+    debug_return;
+}