Fix #11450 cppcheck: error: Failed to add suppression. No id. (#6722)

Author: chrchr-github

lib/suppressions.cpp

@@ -85,10 +85,16 @@ std::string SuppressionList::parseFile(std::istream &istr)
         if (line.empty())
             continue;
 
+        std::string::size_type pos = 0;
+        while (pos < line.size() && std::isspace(line[pos]))
+            ++pos;
+        if (pos == line.size())
+            continue;
+
         // Skip comments
-        if (line.length() > 1 && line[0] == '#')
+        if (line[pos] == '#')
             continue;
-        if (line.length() >= 2 && line[0] == '/' && line[1] == '/')
+        if (pos < line.size() - 1 && line[pos] == '/' && line[pos + 1] == '/')
             continue;
 
         const std::string errmsg(addSuppressionLine(line));

test/testsuppressions.cpp

@@ -967,6 +967,12 @@ class TestSuppressions : public TestFixture {
         SuppressionList suppressions6;
         ASSERT_EQUALS("", suppressions6.parseFile(file6));
         ASSERT_EQUALS(true, suppressions6.isSuppressed(errorMessage("abc", "test.cpp", 123)));
+
+        std::istringstream file7(" // comment\n" // #11450
+                                 "abc");
+        SuppressionList suppressions7;
+        ASSERT_EQUALS("", suppressions7.parseFile(file7));
+        ASSERT_EQUALS(true, suppressions7.isSuppressed(errorMessage("abc", "test.cpp", 123)));
     }
 
     void inlinesuppress() const {