[ODS] Fix not returning invalid values

After allowing urDeviceGetSelected to return zero devices rather than
returning an error, a number of unit tests started failing. This patch
fixes these tests by returning the expected error code during parsing,
rather than after processing all ODS terms. This has the caveat of not
processing all ODS terms before reporting an error and should be
revisited once more robust testing is in place.

source/loader/ur_lib.cpp

@@ -426,8 +426,10 @@ ur_result_t urDeviceGetSelected(ur_platform_handle_t hPlatform,
 
     for (auto &termPair : mapODS) {
         std::string backend = termPair.first;
-        if (backend
-                .empty()) { // FIXME: never true because getenv_to_map rejects this case
+        // TODO: Figure out how to process all ODS errors rather than returning
+        // on the first error.
+        if (backend.empty()) {
+            // FIXME: never true because getenv_to_map rejects this case
             // malformed term: missing backend -- output ERROR, then continue
             logger::error("ERROR: missing backend, format of filter = "
                           "'[!]backend:filterStrings'");
@@ -459,20 +461,19 @@ ur_result_t urDeviceGetSelected(ur_platform_handle_t hPlatform,
                                    std::tolower(static_cast<unsigned char>(b));
                         })) {
             // irrelevant term for current request: different backend -- silently ignore
-            logger::warning(
-                "WARNING: ignoring term with irrelevant backend '{}'", backend);
-            continue;
+            logger::error("unrecognised backend '{}'", backend);
+            return UR_RESULT_ERROR_INVALID_VALUE;
         }
         if (termPair.second.size() == 0) {
-            // malformed term: missing filterStrings -- output ERROR, then continue
-            logger::error("ERROR missing filterStrings, format of filter = "
+            // malformed term: missing filterStrings -- output ERROR
+            logger::error("missing filterStrings, format of filter = "
                           "'[!]backend:filterStrings'");
-            continue;
+            return UR_RESULT_ERROR_INVALID_VALUE;
         }
         if (std::find_if(termPair.second.cbegin(), termPair.second.cend(),
                          [](const auto &s) { return s.empty(); }) !=
-            termPair.second
-                .cend()) { // FIXME: never true because getenv_to_map rejects this case
+            termPair.second.cend()) {
+            // FIXME: never true because getenv_to_map rejects this case
             // malformed term: missing filterString -- output warning, then continue
             logger::warning(
                 "WARNING: empty filterString, format of filterStrings "
@@ -483,10 +484,10 @@ ur_result_t urDeviceGetSelected(ur_platform_handle_t hPlatform,
                          [](const auto &s) {
                              return std::count(s.cbegin(), s.cend(), '.') > 2;
                          }) != termPair.second.cend()) {
-            // malformed term: too many dots in filterString -- output warning, then continue
-            logger::warning("WARNING: too many dots in filterString, format of "
-                            "filterString = 'root[.sub[.subsub]]'");
-            continue;
+            // malformed term: too many dots in filterString
+            logger::error("too many dots in filterString, format of "
+                          "filterString = 'root[.sub[.subsub]]'");
+            return UR_RESULT_ERROR_INVALID_VALUE;
         }
         if (std::find_if(
                 termPair.second.cbegin(), termPair.second.cend(),
@@ -504,10 +505,9 @@ ur_result_t urDeviceGetSelected(ur_platform_handle_t hPlatform,
                     }
                     return false; // no BAD things, so must be okay
                 }) != termPair.second.cend()) {
-            // malformed term: star dot no-star in filterString -- output warning, then continue
-            logger::warning(
-                "WARNING: invalid wildcard in filterString, '*.' => '*.*'");
-            continue;
+            // malformed term: star dot no-star in filterString
+            logger::error( "invalid wildcard in filterString, '*.' => '*.*'");
+            return UR_RESULT_ERROR_INVALID_VALUE;
         }
 
         // TODO -- use regex validation_pattern to catch all other syntax errors in the ODS string