[PATCH v3 12/18] rtla: Enforce exact match for time unit suffixes

[Wander Lairson Costa <wander@redhat.com>]

The parse_ns_duration() function currently uses prefix matching for
detecting time units. This approach is problematic as it silently
accepts malformed strings such as "100nsx" or "100us_invalid" by
ignoring the trailing characters, leading to potential configuration
errors.

Switch to using strcmp() for suffix comparison to enforce exact matches.
This ensures that the parser strictly validates the time unit and
rejects any input containing invalid trailing characters, thereby
improving the robustness of the configuration parsing.

Signed-off-by: Wander Lairson Costa <wander@redhat.com>
---
 tools/tracing/rtla/src/utils.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/tools/tracing/rtla/src/utils.c b/tools/tracing/rtla/src/utils.c
index 486d96e8290fb..b029fe5970c31 100644
--- a/tools/tracing/rtla/src/utils.c
+++ b/tools/tracing/rtla/src/utils.c
@@ -211,15 +211,15 @@ long parse_ns_duration(char *val)
 	t = strtol(val, &end, 10);
 
 	if (end) {
-		if (!strncmp(end, "ns", 2)) {
+		if (strcmp(end, "ns") == 0) {
 			return t;
-		} else if (!strncmp(end, "us", 2)) {
+		} else if (strcmp(end, "us") == 0) {
 			t *= 1000;
 			return t;
-		} else if (!strncmp(end, "ms", 2)) {
+		} else if (strcmp(end, "ms") == 0) {
 			t *= 1000 * 1000;
 			return t;
-		} else if (!strncmp(end, "s", 1)) {
+		} else if (strcmp(end, "s") == 0) {
 			t *= 1000 * 1000 * 1000;
 			return t;
 		}
-- 
2.52.0