add /system/vendor/lib as valid search path for sensor HALs

MultiHal will now accept sensor HALs listed in the hals.conf file that
reside in either /system/lib/hw or /system/vendor/lib.

Bug: 14994424
Change-Id: I13f17352b97c36b97cfbcee8c9b6a0d2e1ed6dc3
diff --git a/modules/sensors/multihal.cpp b/modules/sensors/multihal.cpp
index 135e740..5fd500a 100644
--- a/modules/sensors/multihal.cpp
+++ b/modules/sensors/multihal.cpp
@@ -36,6 +36,7 @@
 
 static const char* CONFIG_FILENAME = "/system/etc/sensors/hals.conf";
 static const char* LEGAL_SUBHAL_PATH_PREFIX = "/system/lib/hw/";
+static const char* LEGAL_SUBHAL_ALTERNATE_PATH_PREFIX = "/system/vendor/lib/";
 static const int MAX_CONF_LINE_LENGTH = 1024;
 
 static pthread_mutex_t init_modules_mutex = PTHREAD_MUTEX_INITIALIZER;
@@ -440,14 +441,15 @@
         }
         ALOGV("config file line #%d: '%s'", ++line_count, line);
         char *real_path = realpath(line, NULL);
-        if (starts_with(real_path, LEGAL_SUBHAL_PATH_PREFIX)) {
+        if (starts_with(real_path, LEGAL_SUBHAL_PATH_PREFIX) ||
+		starts_with(real_path, LEGAL_SUBHAL_ALTERNATE_PATH_PREFIX)) {
             ALOGV("accepting valid path '%s'", real_path);
             char* compact_line = new char[strlen(real_path) + 1];
             strcpy(compact_line, real_path);
             so_paths->push_back(compact_line);
         } else {
-            ALOGW("rejecting path '%s' because it does not start with '%s'",
-                    real_path, LEGAL_SUBHAL_PATH_PREFIX);
+            ALOGW("rejecting path '%s' because it does not start with '%s' or '%s'",
+                    real_path, LEGAL_SUBHAL_PATH_PREFIX, LEGAL_SUBHAL_ALTERNATE_PATH_PREFIX);
         }
         free(real_path);
     }