Fix search for values in blkId output

Bug: 122497152
Test: atest tests/Utils_test.cpp
Test: adb shell sm partition disk:7,32 private ; adb logcat -d
Change-Id: Ic7d32bdbc0c55ce1d21f7f9e74c6a6fb3dcf332a

Utils.cpp

@@ -202,12 +202,15 @@ status_t BindMount(const std::string& source, const std::string& target) {
 
 bool FindValue(const std::string& raw, const std::string& key, std::string* value) {
     auto qual = key + "=\"";
-    auto start = raw.find(qual);
-    if (start > 0 && raw[start - 1] != ' ') {
-        start = raw.find(qual, start + 1);
+    size_t start = 0;
+    while (true) {
+        start = raw.find(qual, start);
+        if (start == std::string::npos) return false;
+        if (start == 0 || raw[start - 1] == ' ') {
+            break;
+        }
+        start += 1;
     }
-
-    if (start == std::string::npos) return false;
     start += qual.length();
 
     auto end = raw.find("\"", start);

tests/Utils_test.cpp

@@ -27,6 +27,7 @@ TEST_F(UtilsTest, FindValueTest) {
     std::string tmp;
 
     ASSERT_FALSE(FindValue("", "KEY", &tmp));
+    ASSERT_FALSE(FindValue("NOTMATCH=\"VALUE\"", "KEY", &tmp));
     ASSERT_FALSE(FindValue("BADKEY=\"VALUE\"", "KEY", &tmp));
 
     ASSERT_TRUE(FindValue("KEY=\"VALUE\"", "KEY", &tmp));
@@ -37,6 +38,9 @@ TEST_F(UtilsTest, FindValueTest) {
 
     ASSERT_TRUE(FindValue("BADKEY=\"VALUE\" KEY=\"BAZ\"", "KEY", &tmp));
     ASSERT_EQ("BAZ", tmp);
+
+    ASSERT_TRUE(FindValue("BADKEY=\"VALUE\" NOTKEY=\"OTHER\" KEY=\"QUUX\"", "KEY", &tmp));
+    ASSERT_EQ("QUUX", tmp);
 }
 
 }  // namespace vold