From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Sun, 26 Jul 2015 18:54:24 +0000 (-0400)
Subject: Fix: Mishandled NULL short options in utils_generate_optstring()
X-Git-Tag: v2.7.0-rc2~171
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=5f1e4ef42b3f1c93bed74c74b8bd430f7d947589;p=lttng-tools.git

Fix: Mishandled NULL short options in utils_generate_optstring()

The NULL character is used to indicate that no short option is
available for a given command.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
---

diff --git a/src/common/utils.c b/src/common/utils.c
index 4b733fb5c..766f224c7 100644
--- a/src/common/utils.c
+++ b/src/common/utils.c
@@ -1050,9 +1050,11 @@ char *utils_generate_optstring(const struct option *long_options,
 			break;
 		}
 
-		optstring[str_pos++] = (char)long_options[i].val;
-		if (long_options[i].has_arg) {
-			optstring[str_pos++] = ':';
+		if (long_options[i].val != '\0') {
+			optstring[str_pos++] = (char) long_options[i].val;
+			if (long_options[i].has_arg) {
+				optstring[str_pos++] = ':';
+			}
 		}
 	}