centralize buffer length sanity checks, add some utility functions forvte_0_10_6

* src/buffer.c, src/buffer.h: centralize buffer length sanity checks, add some
	utility functions for stuffing things into buffers and pulling them
	back out.
* src/debug.c, src/debug.h: add a lifecycle debug class, for tracking
	down initialization order weirdness.
* src/pty.c: try to check that we can run the pty helper before trying to run
	it, to avoid SIGPIPE failures when it's not installed.
* src/vte.c: never grab focus -- let the shell app deal with it.  Return TRUE
	from mouse motion and press/release events to keep them from being
	passed up.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/pty.c b/src/pty.c
index 6bb93a4..cfd19aa 100644
--- a/src/pty.c
+++ b/src/pty.c
@@ -787,6 +787,10 @@ static gboolean
 _vte_pty_start_helper(void)
 {
 	int i, tmp[2], tunnel;
+	/* Sanity check. */
+	if (access(LIBEXECDIR "/gnome-pty-helper", X_OK) != 0) {
+	 	return FALSE;
+	}
 	/* Create a communication link for use with the helper. */
 	tmp[0] = open("/dev/null", O_RDONLY);
 	if (tmp[0] == -1) {