X-Git-Url: http://git.lttng.org./?a=blobdiff_plain;f=src%2Fcommon%2Fevent-field-value.c;h=2dd1947c2eaaf5cbb10763423bfb786b779cb8cc;hb=edbac916fd984b0b50dc3f7cc352a94cb7f24287;hp=d7687880f6b8c575d0ae59584676848c29ce9745;hpb=d28fcdec589e6f0c98fed2f6c094defec58e2b24;p=lttng-tools.git

diff --git a/src/common/event-field-value.c b/src/common/event-field-value.c
index d7687880f..2dd1947c2 100644
--- a/src/common/event-field-value.c
+++ b/src/common/event-field-value.c
@@ -190,8 +190,16 @@ struct lttng_event_field_value *lttng_event_field_value_string_create_with_size(
 		goto error;
 	}
 
-	assert(val);
-	field_val->val = strndup(val, size);
+	if (size) {
+		assert(val);
+		field_val->val = strndup(val, size);
+	} else {
+		/*
+		 * User code do not expect a NULL string pointer. Populate with
+		 * an empty string when length is 0.
+		 */
+		field_val->val = strdup("");
+	}
 	if (!field_val->val) {
 		goto error;
 	}
@@ -387,13 +395,19 @@ lttng_event_field_value_unsigned_int_get_value(
 				parent)->val;
 		break;
 	case LTTNG_EVENT_FIELD_VALUE_TYPE_UNSIGNED_ENUM:
-		*val = container_of(
-				container_of(field_val,
-					const struct lttng_event_field_value_enum,
-					parent),
-				const struct lttng_event_field_value_enum_uint,
-				parent)->val;
+	{
+		const struct lttng_event_field_value_enum *field_val_enum = container_of(
+				field_val,
+				const struct lttng_event_field_value_enum,
+				parent);
+		const struct lttng_event_field_value_enum_uint
+				*field_val_enum_uint = container_of(
+						field_val_enum,
+						const struct lttng_event_field_value_enum_uint,
+						parent);
+		*val = field_val_enum_uint->val;
 		break;
+	}
 	default:
 		status = LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID;
 		goto end;
@@ -423,13 +437,19 @@ lttng_event_field_value_signed_int_get_value(
 				parent)->val;
 		break;
 	case LTTNG_EVENT_FIELD_VALUE_TYPE_SIGNED_ENUM:
-		*val = container_of(
-				container_of(field_val,
-					const struct lttng_event_field_value_enum,
-					parent),
-				const struct lttng_event_field_value_enum_int,
-				parent)->val;
+	{
+		const struct lttng_event_field_value_enum *field_val_enum = container_of(
+				field_val,
+				const struct lttng_event_field_value_enum,
+				parent);
+		const struct lttng_event_field_value_enum_int
+				*field_val_enum_uint = container_of(
+						field_val_enum,
+						const struct lttng_event_field_value_enum_int,
+						parent);
+		*val = field_val_enum_uint->val;
 		break;
+	}
 	default:
 		status = LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID;
 		goto end;
@@ -517,21 +537,23 @@ end:
 	return ret;
 }
 
-const char *lttng_event_field_value_string_get_value(
-		const struct lttng_event_field_value *field_val)
+enum lttng_event_field_value_status lttng_event_field_value_string_get_value(
+		const struct lttng_event_field_value *field_val,
+		const char **value)
 {
-	const char *ret;
+	enum lttng_event_field_value_status status;
 
 	if (!field_val || field_val->type != LTTNG_EVENT_FIELD_VALUE_TYPE_STRING) {
-		ret = NULL;
+		status = LTTNG_EVENT_FIELD_VALUE_STATUS_INVALID;
 		goto end;
 	}
 
-	ret = container_of(field_val,
+	*value = container_of(field_val,
 			const struct lttng_event_field_value_string, parent)->val;
+	status = LTTNG_EVENT_FIELD_VALUE_STATUS_OK;
 
 end:
-	return ret;
+	return status;
 }
 
 enum lttng_event_field_value_status lttng_event_field_value_array_get_length(