[git commit] lineedit: don't fall back to simple line input if tty is in raw mode

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=d598a8d4e655b095c741f0cf73e139b3c9524da1
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

Testcase: shell command input after python ^Z should still work

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 libbb/lineedit.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 8564307..3961b1d 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -2256,9 +2256,13 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
 	INIT_S();
 
 	if (tcgetattr(STDIN_FILENO, &initial_settings) < 0
-	 || !(initial_settings.c_lflag & ECHO)
+	 || (initial_settings.c_lflag & (ECHO|ICANON)) == ICANON
 	) {
-		/* Happens when e.g. stty -echo was run before */
+		/* Happens when e.g. stty -echo was run before.
+		 * But if ICANON is not set, we don't come here.
+		 * (example: interactive python ^Z-backgrounded,
+		 * tty is still in "raw mode").
+		 */
 		parse_and_put_prompt(prompt);
 		/* fflush_all(); - done by parse_and_put_prompt */
 		if (fgets(command, maxsize, stdin) == NULL)